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1.
Molecules ; 26(17)2021 Aug 27.
Artículo en Inglés | MEDLINE | ID: mdl-34500637

RESUMEN

The most common cause of iron deficiency is an improperly balanced diet, in which the body's need for iron cannot be met by absorption of this element from food. Targeted iron supplementation and food fortification may be the main treatments for iron deficiency in the population. However, many iron-rich supplements and foods have low bioavailability of this element. In our study, we used yeast enriched with iron ions to produce flatbread. The yeast cells accumulated iron ions from the medium supplemented with Fe(NO3)3·9H2O, additionally one of the cultures was treated with pulsed electric field in order to increase the accumulation. The potential bioavailability of iron from flatbread containing 385.8 ± 4.12 mg of iron in 100 g dry mass was 10.83 ± 0.94%. All the flatbreads had a moderate glycemic index. There were no significant differences in antioxidant activity against DPPH• between flatbread with iron-enriched and non-iron-enriched yeast. Sensory evaluation showed that this product is acceptable to consumers since no metallic aftertaste was detected. Iron enriched flatbread can potentially be an alternative to dietary supplements in iron deficiency states.


Asunto(s)
Pan/microbiología , Suplementos Dietéticos/microbiología , Alimentos Fortificados/microbiología , Hierro/metabolismo , Saccharomyces cerevisiae/metabolismo , Anemia Ferropénica/metabolismo , Anemia Ferropénica/prevención & control , Antioxidantes/metabolismo , Disponibilidad Biológica , Índice Glucémico/fisiología , Humanos
2.
Matern Child Nutr ; 16(1): e12856, 2020 01.
Artículo en Inglés | MEDLINE | ID: mdl-31183951

RESUMEN

Child malnutrition remains persistently high in Rwanda. Complementary foods play a key role in young child nutrition. This study explores the quality and safety of complementary food products available in the Rwandan market. Ten of the most consumed porridge-type complementary food products in Rwanda have been analysed. Mean values of macronutrient and micronutrient contents were compared against three international standards and evaluated against label claims. Mean mycotoxin, microbiological, and pesticide contamination were compared with maximum tolerable limits. Mean energy density (385 kcal/100 g) and total fat content (7.9 g/100 g) were lower than all three international benchmarks. The mean fibre content of 8.5 g/100 g was above the maximum recommended amount of Codex Alimentarius and more than double the amount claimed on labels. Mean levels of vitamin A (retinyl palmitate, 0.54 mg/100 g) and vitamin E (α-tocopherol, 3.7 mg/100 g) fell significantly short of all three standards, whereas calcium and zinc requirements were only partially met. Average iron content was 12.1 mg/100 g. The analysis revealed a mean aflatoxin contamination of 61 µg/kg, and high mold and yeast infestation. Escherichia coli and pesticide residues were found, whereas no heavy metals could be quantitated. Overall, complementary food products in Rwanda show inadequate nutrient contents and high aflatoxin and microbial contamination levels. Improved regulation and monitoring of both local and imported products are needed to improve the quality and safety of complementary foods in Rwanda.


Asunto(s)
Contaminación de Alimentos , Alimentos Fortificados/análisis , Alimentos Fortificados/normas , Fenómenos Fisiológicos Nutricionales del Lactante , Valor Nutritivo , Escherichia coli , Etiquetado de Alimentos/normas , Alimentos Fortificados/microbiología , Hongos , Humanos , Lactante , Micronutrientes/análisis , Micotoxinas/análisis , Nutrientes/análisis , Necesidades Nutricionales , Plaguicidas , Rwanda , Levaduras
3.
Probiotics Antimicrob Proteins ; 12(2): 756-763, 2020 06.
Artículo en Inglés | MEDLINE | ID: mdl-31187395

RESUMEN

Folate deficiency is a public health concern affecting all age groups worldwide. The available evidence reveals that adding probiotic bacteria to the yoghurt starter cultures during yoghurt production process under fermentation conditions increases the folate content of yoghurt. The present study was conducted to measure two folate derivatives, i.e., 5-methyltetrahydrofolate and 5-formyltetrahydrofolate, in bio-fortified yoghurt samples including (1) yoghurt containing Streptococcus thermophilus and Lactobacillus bulgaricus, (2) probiotic yoghurt containing Lactobacillus acidophilus LA-5 and Bifidobacterium lactis BB-12, (3) probiotic yoghurt containing native strains of Lactobacillus plantarum 15HN, (4) probiotic yoghurt containing native strains of Lactococcus lactis 44Lac, and (5) probiotic yoghurt containing commercial strains of Lactobacillus plantarum LAT BY PL. During storage at 4 °C for 21 days, the highest levels of 5-methyltetrahydrofolate and 5-formyltetrahydrofolate, which were statistically significant, were detected in the yoghurt made using Lact. plantarum 15HN. Moreover, the highest total folate concentration (1487 ± 96.42 µg/L) was specified in the yoghurt containing Lact. plantarum 15HN on the 7th day. It can be conjectured that this product can be suggested as a proper alternative to synthetic folic acid and may not have the side effects of using synthetic folic acid overdoses.


Asunto(s)
Ácido Fólico/análisis , Microbiología de Alimentos , Alimentos Fortificados , Probióticos , Yogur , Alimentos Fortificados/análisis , Alimentos Fortificados/microbiología , Yogur/análisis , Yogur/microbiología
4.
Food Microbiol ; 86: 103349, 2020 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-31703858

RESUMEN

Pistachio powder was added to flour or semolina to evaluate its contribution to increase the amount of lysine in bread. Bread production was carried out by sourdough technology using a selected 3-species (Lactobacillus sanfranciscensis/Leuconostoc citreum/Weissella cibaria) lactic acid bacterial (LAB) starter culture. All sourdoughs were subjected to a long-time fermentation (21 h) and showed levels of LAB around 109 CFU/g, indicating the suitability of pistachio powder for lactic fermentation. Yeasts were also detected, in particular in semolina trials. MiSeq Illumina technology was applied to investigate the bacterial composition of sourdoughs evidencing a different distribution of LAB species among the trials with Lactobacillus as major LAB group in almost all sourdoughs. Physicochemical parameters were comparable among the trials. After baking, pistachio powder was found not to influence the height of the breads, but pistachio breads were more firm than control breads. Color of the breads, void fraction and cell density, were influenced by pistachio powder. The amount of lysine increased consistently thanks to pistachio supplementation which also determined a higher presence of o-xylene, p-cymene and limonene and the appearance of α-pinene and 1-octen-3-ol in breads. Sensory tests showed the best appreciation scores for the breads produced with flour and pistachio powder.


Asunto(s)
Pan/análisis , Aditivos Alimentarios/análisis , Lactobacillus/metabolismo , Leuconostoc/metabolismo , Lisina/análisis , Pistacia/química , Weissella/metabolismo , Pan/microbiología , Fermentación , Harina/análisis , Aditivos Alimentarios/metabolismo , Alimentos Fortificados/análisis , Alimentos Fortificados/microbiología , Humanos , Lisina/metabolismo , Gusto
5.
Nutr Metab Cardiovasc Dis ; 28(6): 565-574, 2018 06.
Artículo en Inglés | MEDLINE | ID: mdl-29724529

RESUMEN

BACKGROUND AND AIMS: Obesity is a complex and multifaceted condition. Thus, functional foods need investigation as novel adjunct treatments for obesity. The objective was to determine the effects of daily consumption of a fortified yogurt (FY) on weight loss in overweight and obese patients with metabolic syndrome on a caloric-restricted diet. METHODS AND RESULTS: This was a randomized, double-blind, 10-week study. Participants were randomly allocated to two groups receiving either two servings (2 × 250 g)/day of FY with whey protein, calcium, vitamin D, prebiotic fibre and probiotic cultures (n = 44) or a low-fat plain yogurt (PY) (n = 43). All participants were put on a calorie-restricted diet throughout the 10-week study. Body composition and biochemical indices were assessed before and after the intervention. Body mass decreased by 4.3 ± 1.9 kg and 5.1 ± 3.0 kg in the PY and FY groups, respectively, following the 10-week intervention. Compared to PY, consumption of FY resulted in a significant reduction in body fat mass (FM) (p = 0.023), body fat percentage (p = 0.028), waist circumference (p = 0.002), homoeostasis model of assessment-insulin resistance (HOMA-IR) (p = 0.025), triglyceride concentration (p = 0.003), and a significant increase in total 25-hydroxyvitamin D (25(OH)D) concentration (p < 0.001), high density lipoprotein-cholesterol (HDL-C) (p = 0.009) and quantitative insulin sensitivity check index (QUICKI) (0.022). Participants consuming the FY lost less fat-free mass (FFM) compared to the PY group (Δ = -0.9 ± 3.5 kg vs. Δ = -2.0 ± 2.7 kg; p = 0.025). CONCLUSIONS: Consuming FY for 10-weeks improved body composition and metabolic parameters, while on a caloric-restricted diet. Further research is needed to elucidate whether FY can be used as a preventative strategy for metabolic syndrome in obese persons. TRIAL REGISTRATION: www.irct.ir (IRCT2017050633836N1).


Asunto(s)
Restricción Calórica , Alimentos Fortificados , Síndrome Metabólico/dietoterapia , Obesidad/dietoterapia , Pérdida de Peso , Yogur , Adiposidad , Adulto , Anciano , Calcio/administración & dosificación , Método Doble Ciego , Femenino , Alimentos Fortificados/microbiología , Humanos , Irán , Masculino , Síndrome Metabólico/diagnóstico , Síndrome Metabólico/microbiología , Síndrome Metabólico/fisiopatología , Persona de Mediana Edad , Obesidad/diagnóstico , Obesidad/microbiología , Obesidad/fisiopatología , Tamaño de la Porción , Prebióticos/administración & dosificación , Probióticos/administración & dosificación , Ingesta Diaria Recomendada , Factores de Tiempo , Resultado del Tratamiento , Vitamina D/administración & dosificación , Proteína de Suero de Leche/administración & dosificación , Yogur/microbiología , Adulto Joven
6.
Cell Mol Biol (Noisy-le-grand) ; 63(6): 44-48, 2017 Jul 31.
Artículo en Inglés | MEDLINE | ID: mdl-28968208

RESUMEN

Folate, natural form of water soluble vitamin folic acid, is significant for humans as involved in most important metabolic reactions i.e. nucleotide synthesis and amino acid inter conversions. Thus its deficiency causes neural tube defects in newborns and cardiovascular diseases, and cancers. Humans cannot synthesize folate de novo so consumption through diet is essential. Natural food sources, supplements and fortified food products are the choices available to complete the Daily recommended intake. However microbial fortification using probiotics recently gained wide attention due to dual advantage of natural food matrix with enhanced folate content along with the probiotics benefits. Current study was focused on the microbial fortification of fruit juices and their efficacy and stability studies. Freshly filtered orange and tomato juice was prepared and inoculated with Streptococcus thermophilus NCIM 2904. Incubation was done at 40°C and samples were collected at different time interval. Folate extraction was done using human plasma and content was measured by microbiological assay using Lactobacillus casei NCIM No. 2364. Efficacy and stability studies were carried out to ensure the quality of juices to be consumed in terms of folate content, viable cell count and pH after 4 weeks of storage at low temperature. Positive results were observed as folate content was quite stable whereas viable cell count was also found to be significant till some time without adding any preservatives. The results indicated that fortified fruit juices could be used as probiotic beverages with enhanced folate content.


Asunto(s)
Ácido Fólico/metabolismo , Alimentos Fortificados/microbiología , Jugos de Frutas y Vegetales/microbiología , Probióticos/metabolismo , Suplementos Dietéticos/microbiología , Lacticaseibacillus casei/metabolismo , Streptococcus thermophilus/metabolismo
7.
J Sci Food Agric ; 97(12): 4160-4168, 2017 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-28233313

RESUMEN

BACKGROUND: The effect of the addition of flaxseed oil (FO), phytosterols (PS) and polydextrose (PDX) on the physicochemical and sensory properties of milk was investigated, as they are known to impart health benefits. RESULTS: For incorporating PS, a hydrophobic substance, FO and milk fat (MF) as an oil source, an emulsifier (DATEM) and PDX solution as an aqueous medium were used for the preparation of emulsion. Three emulsion formulations A (8 g PS, 8 g FO, 20 g PDX, 6 g MF), B (10 g PS, 10 g FO, 20 g PDX, 4 g MF) and C (12 g PS, 12 g FO, 20 g PDX, 2 g MF) were prepared and added individually to milk at a level of 50 g kg-1 . Based on sensory evaluation, formulation B was selected for fortification of milk. The fortified milk kept well at refrigerated temperature for 1 week, and changes in sensory, physicochemical and microbiological properties were comparable to those of control milk. The level of fortificants did not decrease in the milk after 1 week of storage. CONCLUSION: An emulsion containing FO, PS and PDX could successfully serve as a potential delivery system for enhancing the nutritional and therapeutic potential of milk. © 2017 Society of Chemical Industry.


Asunto(s)
Ácidos Grasos Omega-3/análisis , Alimentos Fortificados/análisis , Alimentos Fortificados/microbiología , Leche/química , Leche/microbiología , Fitosteroles/análisis , Animales , Bovinos , Ácidos Grasos Omega-3/metabolismo , Femenino , Aditivos Alimentarios/análisis , Aditivos Alimentarios/metabolismo , Humanos , Aceite de Linaza/análisis , Aceite de Linaza/metabolismo , Leche/metabolismo , Fitosteroles/metabolismo , Gusto
8.
Food Microbiol ; 62: 169-177, 2017 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-27889145

RESUMEN

With the aim of selecting starter cultures with interesting probiotic potential and with the ability to produce folate in a food matrix, yeast strains isolated from fermented cereal-based African foods were investigated. A total of 93 yeast strains were screened for their tolerance to pH 2 and 0.3% of bile salts. Pichia kudriavzevii isolates gave the best results. Selected P. kudriavzevii strains were tested for survival to the simulated human digestion and for adhesion to Caco-2 cells. Moreover, presence of folate biosynthesis genes was verified and production of extra and intra-cellular folate determined during growth in culture medium. 31% of yeast strains could tolerate pH 2, while 99% bile salts. Survival rate after simulated digestion ranged between 11 and 45%, while adhesion rate between 12 and 40%. Folate production was mainly intracellular, maximum after 24 h of growth. To be closer to traditional cereal-based fermentations, a P. kudriavzevii strain with good probiotic potential was co-inoculated with Lactobacillus fermentum strains in a pearl millet gruel. This resulted in in situ folate production that peaked after 4 h. The use of strains with both probiotic and nutritional enrichment properties may have a greater impact for the consumers.


Asunto(s)
Grano Comestible/química , Ácido Fólico/análisis , Pichia/fisiología , Probióticos , África , Ácidos y Sales Biliares , Células CACO-2 , Fermentación , Ácido Fólico/biosíntesis , Microbiología de Alimentos , Alimentos Fortificados/análisis , Alimentos Fortificados/microbiología , Humanos , Limosilactobacillus fermentum/metabolismo , Viabilidad Microbiana , Valor Nutritivo , Pichia/aislamiento & purificación , Probióticos/metabolismo
9.
Br J Nutr ; 115(7): 1232-9, 2016 Apr 14.
Artículo en Inglés | MEDLINE | ID: mdl-26864127

RESUMEN

There is a need for food-based solutions for preventing vitamin D deficiency. Vitamin D3 (D3) is mainly used in fortified food products, although the production of vitamin D2 (D2) is more cost-effective, and thus may hold opportunities. We investigated the bioavailability of D2 from UV-irradiated yeast present in bread in an 8-week randomised-controlled trial in healthy 20-37-year-old women (n 33) in Helsinki (60°N) during winter (February-April) 2014. Four study groups were given different study products (placebo pill and regular bread=0 µg D2 or D3/d; D2 supplement and regular bread=25 µg D2/d; D3 supplement and regular bread=25 µg D3/d; and placebo pill and D2-biofortified bread=25 µg D2/d). Serum 25-hydroxyvitamin D2 (S-25(OH)D2) and serum 25-hydroxyvitamin D3 (S-25(OH)D3) concentrations were measured at baseline, midpoint and end point. The mean baseline total serum 25-hydroxyvitamin D (S-25(OH)D=S-25(OH)D2+S-25(OH)D3) concentration was 65·1 nmol/l. In repeated-measures ANCOVA (adjusted for baseline S-25(OH)D as total/D2/D3), D2-bread did not affect total S-25(OH)D (P=0·707) or S-25(OH)D3 (P=0·490), but increased S-25(OH)D2 compared with placebo (P<0·001). However, the D2 supplement was more effective than bread in increasing S-25(OH)D2 (P<0·001). Both D2 and D3 supplementation increased total S-25(OH)D compared with placebo (P=0·030 and P=0·001, respectively), but D2 supplementation resulted in lower S-25(OH)D3 (P<0·001). Thus, D2 from UV-irradiated yeast in bread was not bioavailable in humans. Our results support the evidence that D2 is less potent in increasing total S-25(OH)D concentrations than D3, also indicating a decrease in the percentage contribution of S-25(OH)D3 to the total vitamin D pool.


Asunto(s)
Pan/análisis , Colecalciferol/administración & dosificación , Ergocalciferoles/administración & dosificación , Alimentos Fortificados , Vitamina D/análogos & derivados , Adulto , Disponibilidad Biológica , Pan/microbiología , Calcio/sangre , Colecalciferol/farmacocinética , Suplementos Dietéticos , Ergocalciferoles/análisis , Ergocalciferoles/farmacocinética , Femenino , Finlandia , Alimentos Fortificados/microbiología , Humanos , Hormona Paratiroidea/sangre , Placebos , Saccharomyces cerevisiae/química , Saccharomyces cerevisiae/efectos de la radiación , Estaciones del Año , Rayos Ultravioleta , Vitamina D/sangre , Adulto Joven
10.
Acta Sci Pol Technol Aliment ; 15(1): 37-45, 2016.
Artículo en Inglés | MEDLINE | ID: mdl-28071037

RESUMEN

BACKGROUND: In the process of enrichment of dairy products a priority element is the proper selection of compounds that are a mineral carrier. Calcium bisglycinate is better absorbed by the body than inorganic forms of calcium. Moreover, the lactic acid which is produced in kefir fermentation and the presence of lactose have also a positive effect on the improvement of absorption of calcium. The aim of the present study was to determine the influence of the applied dose of calcium in the form of calcium bisglycinate on the physicochemical and sensory properties and texture of kefirs during 21-day period of cold storage. METHODS: Processed cow milk was enriched with 0, 5, 10, 15, 20, 25 and 30 mg of calcium (for 100 g of milk), repasteurized (72°C, 1 min), cooled down (26°C), inoculated with Commercial VITAL kefir culture (Danisco, Poland) and fermented for 16 hours (26°C). The assessment of the influence of addition   of calcium bisglycinate on acidity, syneresis, texture and sensory characteristics (1-9 points) of kefirs was conducted at four fixed dates (after 1 day, 7 days, 14 days and 21 days of storage). RESULTS: During successive weeks of cold storage in all experimental groups there was observed a tendency to decrease general acidity. On the 1st and 7th days of cold storage reduced whey leakage was observed in kefirs enriched with 25 mg and 30 mg Ca/100 g of milk. With increasing doses of enrichment with calcium both the hardness, adhesiveness and gumminess of kefirs decreased. The applied doses of calcium did not cause changes in the sensory characteristics such as colour and consistency of the fermented beverages. CONCLUSIONS: Calcium bisglycinate may be used to enrich kefirs with calcium even with 30 mg of calcium in 100 g of milk without the modification of the product's parameters.


Asunto(s)
Calcio de la Dieta/análisis , Calidad de los Alimentos , Almacenamiento de Alimentos , Alimentos Fortificados/análisis , Glicina/química , Kéfir/análisis , Compuestos Organometálicos/química , Adhesividad , Fenómenos Químicos , Fermentación , Alimentos Fortificados/microbiología , Dureza , Humanos , Concentración de Iones de Hidrógeno , Kéfir/microbiología , Lactobacillus acidophilus/crecimiento & desarrollo , Lactobacillus acidophilus/metabolismo , Lactococcus lactis/crecimiento & desarrollo , Lactococcus lactis/metabolismo , Leuconostoc/crecimiento & desarrollo , Leuconostoc/metabolismo , Fenómenos Mecánicos , Pasteurización , Sensación , Streptococcus thermophilus/crecimiento & desarrollo , Streptococcus thermophilus/metabolismo , Simbiosis , Levaduras/crecimiento & desarrollo , Levaduras/metabolismo
11.
J Agric Food Chem ; 62(25): 5948-53, 2014 Jun 25.
Artículo en Inglés | MEDLINE | ID: mdl-24869769

RESUMEN

Selenium (Se) biofortification of barley is a suitable strategy to increase the Se concentration in grain. In the present paper, the suitability of this Se-biofortified grain for making Se-enriched beer is analyzed. The aim of the present study was to evaluate the effect of different Se fertilizer doses (0, 10, and 20 g of Se ha(-1)) and forms (sodium selenate or sodium selenite) on the Se loss during the malting and brewing processes and Se speciation in grain, malt, wort, and beer. Samples were analyzed using inductively coupled plasma-mass spectrometry (ICP-MS) and high-performance liquid chromatography (HPLC)-ICP-MS for total Se and speciation. Mashing-lautering was the process with the greatest Se loss (83.8%). After malting and brewing, only 7.3% of the initial Se was retained in beer, mainly in selenite form. Even so, the fertilizer application of sodium selenate at 20 g ha(-1) increased the total Se concentration almost 6-fold in the final beer in comparison to the use of grain derived from unfertilized barley. The present paper provides evidence that the use of Se-biofortified barley grain as a raw material to produce Se-enriched beer is possible, and the results are comparable to other methods in terms of efficiency.


Asunto(s)
Cerveza/análisis , Alimentos Fortificados/análisis , Hordeum/química , Selenio/análisis , Cerveza/microbiología , Fermentación , Fertilizantes/análisis , Alimentos Fortificados/microbiología , Germinación , Hordeum/crecimiento & desarrollo , Hordeum/metabolismo , Hordeum/microbiología , Saccharomyces cerevisiae/metabolismo , Semillas/química , Semillas/crecimiento & desarrollo , Semillas/metabolismo , Semillas/microbiología , Selenio/metabolismo , Compuestos de Selenio/análisis , Compuestos de Selenio/metabolismo
12.
J Nutr ; 144(7): 1016-22, 2014 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-24812068

RESUMEN

The bioavailability of whole-grain rye-derived phytochemicals has not yet been comprehensively characterized, and different baking and manufacturing processes can modulate the phytochemical composition of breads and other rye products. The aim of our study was to find key differences in the phytochemical profile of plasma after the consumption of 3 breads containing rye bran when compared with a plain white wheat bread control. Plasma metabolite profiles of 12 healthy middle-aged men and women were analyzed using LC quadrupole time-of-flight mass spectrometry metabolomics analysis while fasting and at 60 min, 120 min, 240 min, and 24 h after consuming a meal that contained either 100% whole-grain sourdough rye bread or white wheat bread enriched with native unprocessed rye bran or bioprocessed rye bran. White wheat bread was used as the control. The meals were served in random order after a 12-h overnight fast, with at least 3 d between each occasion. Two sulfonated phenylacetamides, hydroxy-N-(2-hydroxyphenyl) acetamide and N-(2-hydroxyphenyl) acetamide, potentially derived from the benzoxazinoid metabolites, were among the most discriminant postprandial plasma biomarkers distinguishing intake of breads containing whole-meal rye or rye bran from the control white wheat bread. Furthermore, subsequent metabolite profiling analysis of the consumed breads indicated that different bioprocessing/baking techniques involving exposure to microbial metabolism (e.g., sourdough fermentation) have a central role in modulating the phytochemical content of the whole-grain and bran-rich breads.


Asunto(s)
Acetanilidas/sangre , Benzoxazinas/metabolismo , Pan , Fibras de la Dieta/metabolismo , Harina , Secale/química , Semillas/química , Acetanilidas/metabolismo , Anciano , Pan/microbiología , Fibras de la Dieta/análisis , Femenino , Fermentación , Finlandia , Manipulación de Alimentos , Alimentos Fortificados/microbiología , Humanos , Hidroxilación , Lactobacillus/metabolismo , Masculino , Persona de Mediana Edad , Periodo Posprandial , Saccharomyces cerevisiae/metabolismo , Sulfatos/sangre , Sulfatos/metabolismo , Ácidos Sulfónicos/sangre , Ácidos Sulfónicos/metabolismo
13.
J Sci Food Agric ; 93(2): 396-409, 2013 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-22806322

RESUMEN

BACKGROUND: The aim of this study was to evaluate the effect of electroporation (2.5-7.5 kV cm⁻¹ for 3.0-4.0 ms) on the growth of lactobacilli and bifidobacteria, membrane properties and bioconversion of isoflavones in mannitol-soymilk. RESULTS: The viability of lactobacilli and bifidobacteria decreased immediately after electroporation. This was attributed to lipid peroxidation, which led to alterations in the membrane phospholipid bilayer, specifically at the polar head, interface and apolar tail regions. Such alterations also resulted in decreased membrane fluidity and increased membrane permeability upon electroporation (P < 0.05). However, the effect was reversible and treated cells showed better growth than the control upon fermentation for 24 h at 37 °C (P < 0.05). Additionally, electroporation increased the bioconversion of glucosides to bioactive aglycones in mannitol-soymilk, which was attributed to increased intracellular and extracellular ß-glucosidase activities of cells upon treatment (P < 0.05). CONCLUSION: Application of electroporation on lactobacilli and bifidobacteria could be beneficial for the development of fermented soymilk with enhanced bioactivity. Considering the enhanced bioactive aglycones, this soymilk could be useful for the prevention of hormone-dependent disorders.


Asunto(s)
Bifidobacterium/metabolismo , Membrana Celular/química , Alimentos Fortificados/análisis , Isoflavonas/metabolismo , Lacticaseibacillus casei/metabolismo , Manitol/metabolismo , Leche de Soja/química , Proteínas Bacterianas/metabolismo , Bifidobacterium/enzimología , Bifidobacterium/crecimiento & desarrollo , Membrana Celular/metabolismo , Permeabilidad de la Membrana Celular , Electroporación , Fermentación , Alimentos Fortificados/microbiología , Glucósidos/análisis , Glucósidos/metabolismo , Hidrólisis , Isoflavonas/análisis , Lacticaseibacillus casei/enzimología , Lacticaseibacillus casei/crecimiento & desarrollo , Peroxidación de Lípido , Manitol/análisis , Fluidez de la Membrana , Viabilidad Microbiana , Fitoestrógenos/análisis , Fitoestrógenos/metabolismo , Prebióticos/análisis , Probióticos/metabolismo , beta-Glucosidasa/metabolismo
15.
Adv Food Nutr Res ; 65: 457-78, 2012.
Artículo en Inglés | MEDLINE | ID: mdl-22361206

RESUMEN

The concept of nutraceutical has been derived by coining the terms "nutrition" and "pharmaceutical". In this context, active substances with pharmaceutical properties are delivered to the humans through food-based approaches to prevent or treat certain disease conditions. Since the natural sources are recognized as safe for human consumption, the active substances produced in the diverse group of marine organisms have a wide role in the nutraceutical industry. These marine-derived active ingredients include certain polysaccharides, polyphenols, bioactive peptides, polyunsaturated fatty acids, and carotenoids which are known to have anticancer, anti-inflammatory, antioxidant, antiobese, hypocholesteroleic, antimicrobial, prebiotic, and probiotic activity enabling them to be applied as nutraceuticals. As the dairy products are widely accepted by the consumers, the delivering of nutraceuticals through dairy products have received a greater attention of the dairy industry. Since the incorporation of marine-derived active ingredients into the dairy products have caused minimal changes in the physico-chemical properties of the final product, marine-derived substances have been widely applied and have the potential to be applied as nutraceuticals in the dairy industry.


Asunto(s)
Organismos Acuáticos/metabolismo , Productos Lácteos/análisis , Suplementos Dietéticos , Alimentos Especializados/análisis , Promoción de la Salud , Animales , Chlorophyta/metabolismo , Productos Lácteos/microbiología , Fermentación , Alimentos Fortificados/análisis , Alimentos Fortificados/microbiología , Alimentos Especializados/microbiología , Hongos/metabolismo , Humanos , Phaeophyceae/metabolismo , Prebióticos , Probióticos
16.
J Food Sci ; 76(6): M324-8, 2011 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-22417504

RESUMEN

UNLABELLED: Powdered infant formula has previously been linked to the transmission of various bacterial pathogens in infants resulting in life-threatening disease and death. Survival studies of 2 common foodborne pathogens, Salmonella enterica serovar Typhi and Shigella dysenteriae, in powdered infant formula have not been previously studied despite the potentially devastating consequences from ingestion of these organisms, particularly by newborns, in case of a natural or deliberate contamination event. Therefore, to better predict the risk of S. Typhi and S. dysenteriae infection from consumption of infant formula, the present study was undertaken to determine survival of these microorganisms in dry infant formula under varying atmospheric conditions. A 2-strain cocktail of S. Typhi and a 3-strain cocktail of S. dysenteriae were stored for up to 12 wk in dehydrated infant formula in an ambient air or nitrogen atmosphere. Viable counts of S. Typhi at 12 wk in infant formula revealed a 2.9- and 1.69-log decrease in ambient air and nitrogen atmosphere, respectively. Viable counts of S. dysenteriae at 12 wk in infant formula revealed a 0.81- and 0.42-log decrease in ambient air and nitrogen atmosphere, respectively. These results show that S. Typhi and S. dysenteriae can remain viable for prolonged periods of time in powdered infant formula, and the presence of nitrogen enhances survival. PRACTICAL APPLICATION: Our goal in this work was to study the survival of S. Typhi and S. dysenteriae in dehydrated storage conditions in infant formula. This interest is partially generated by the possibility of using these 2 microorganisms to deliberately contaminate the food supply. The outcome of this study will help us to have a better idea how to respond and react to the risk of deliberate food contamination.


Asunto(s)
Alimentos en Conserva/microbiología , Fórmulas Infantiles , Viabilidad Microbiana , Salmonella typhi/crecimiento & desarrollo , Shigella dysenteriae/crecimiento & desarrollo , Recuento de Colonia Microbiana , Embalaje de Alimentos , Alimentos Fortificados/análisis , Alimentos Fortificados/microbiología , Alimentos en Conserva/análisis , Enfermedades Transmitidas por los Alimentos/prevención & control , Liofilización , Humanos , Lactante , Fórmulas Infantiles/química , Hierro de la Dieta/antagonistas & inhibidores , Nitrógeno/metabolismo , Oxígeno/metabolismo , Factores de Tiempo
17.
J Food Sci ; 75(6): M373-6, 2010 Aug 01.
Artículo en Inglés | MEDLINE | ID: mdl-20722939

RESUMEN

The presence of phytate in calcium-fortified soymilk may interfere with mineral absorption. Certain lactic acid bacteria (LAB) produce the enzyme phytase that degrades phytates and therefore may potentially improve mineral bioavailability and absorption. This study investigates the phytase activity and phytate degradation potential of 7 strains of LAB including: Lactobacillus acidophilus ATCC4962, ATCC33200, ATCC4356, ATCC4161, L. casei ASCC290, L. plantarum ASCC276, and L. fermentum VRI-003. Activity of these bacteria was examined both in screening media and in calcium-fortified soymilk supplemented with potassium phytate. Most strains produced phytase under both conditions with L. acidophilus ATCC4161 showing the highest activity. Phytase activity in fortified soymilk fermented with L. acidophilus ATCC4962 and L. acidophilus ATCC4161 increased by 85% and 91%, respectively, between 12 h and 24 h of fermentation. All strains expressed peak phytase activity at approximately pH 5. However, no phytate degradation could be observed.


Asunto(s)
6-Fitasa/metabolismo , Proteínas Bacterianas/metabolismo , Calcio de la Dieta , Microbiología de Alimentos , Alimentos Fortificados/microbiología , Lactobacillus/enzimología , Leche de Soja , Calcio de la Dieta/administración & dosificación , Fermentación , Manipulación de Alimentos , Concentración de Iones de Hidrógeno , Lactobacillus acidophilus/enzimología , Ácido Fítico/análisis , Leche de Soja/química , Especificidad de la Especie , Temperatura , Factores de Tiempo
18.
Food Sci Technol Int ; 16(1): 31-42, 2010 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-21339119

RESUMEN

Two ready-to-eat minced fish products from hake were developed, their proximate composition and fatty acid profiles determined and their quality changes followed during 3.5 months under refrigeration at 2 ± 1 °C and 10 ± 1 °C. These products contain dietary fiber and are innovative and healthy. The formulation was identical, except vegetable oil (VO), 5.6% (w/w) in one group and 2.7% (w/w) plus 2.9% (w/w) cod liver oil (CLO) in the other. CLO products had a higher ω3/ω6 ratio (0.54 ± 0.02 versus 0.08 ± 0.02) and ensured, per 100 g serving, the 500 mg recommended daily intake of eicosapentaenoic and docosahexaenoic acids. CLO products showed lower gel strength (p ≤ 0.05), however, other textural properties were similar to those of the VO group. Thiobarbituric acid reactive substances values were higher in CLO products. All groups presented acceptable sensory scores and no microbiological growth. During storage products became redder and less yellow, while seafood aroma and flavor declined and saltiness perception augmented. Temperature had a negative effect on sensory elasticity and instrumental texture.


Asunto(s)
Fibras de la Dieta , Ácidos Grasos Omega-3 , Productos Pesqueros/análisis , Manipulación de Alimentos , Alimentos Fortificados/análisis , Animales , Fenómenos Químicos , Aceite de Hígado de Bacalao , Frío , Color , Comida Rápida/análisis , Comida Rápida/microbiología , Ácidos Grasos Omega-3/análisis , Productos Pesqueros/microbiología , Microbiología de Alimentos , Alimentos Fortificados/microbiología , Gadiformes , Humanos , Fenómenos Mecánicos , Aceites de Plantas , Control de Calidad , Sensación , Sustancias Reactivas al Ácido Tiobarbitúrico , Agua/análisis
19.
J Food Sci ; 75(8): R175-81, 2010 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-21535513

RESUMEN

Fresh-cut fruit consumption is increasing due to the rising public demand for convenience and awareness of fresh-cut fruit's health benefits. The entire tissue of fruits and vegetables is rich in bioactive compounds, such as phenolic compounds, carotenoids, and vitamins. The fresh-cut fruit industry deals with the perishable character of its products and the large percentage of byproducts, such as peels, seeds, and unused flesh that are generated by different steps of the industrial process. In most cases, the wasted byproducts can present similar or even higher contents of antioxidant and antimicrobial compounds than the final produce can. In this context, this hypothesis article finds that the antioxidant enrichment and antimicrobial protection of fresh-cut fruits, provided by the fruit's own byproducts, could be possible.


Asunto(s)
Antiinfecciosos , Antioxidantes , Conservación de Alimentos/métodos , Alimentos Fortificados/análisis , Alimentos Fortificados/microbiología , Frutas/química , Frutas/microbiología , Antiinfecciosos/análisis , Antiinfecciosos/economía , Antioxidantes/análisis , Antioxidantes/economía , Comida Rápida/análisis , Comida Rápida/microbiología , Embalaje de Alimentos , Industria de Procesamiento de Alimentos/economía , Residuos Industriales/análisis , Residuos Industriales/economía , Extractos Vegetales/química , Extractos Vegetales/economía
20.
J Food Sci ; 74(6): M231-6, 2009 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-19723206

RESUMEN

This study investigated 2 different homogenization techniques for reducing the size of calcium alginate beads during the microencapsulation process of 8 probiotic bacteria strains, namely, Lactobacillus rhamnosus, L. salivarius, L. plantarum, L. acidophilus, L. paracasei, Bifidobacterium longum, B. lactis type Bi-04, and B. lactis type Bi-07. Two different homogenization techniques were used, namely, ultra-turrax benchtop homogenizer and Microfluidics microfluidizer. Various settings on the homogenization equipment were studied such as the number of passes, speed (rpm), duration (min), and pressure (psi). The traditional mixing method using a magnetic stirrer was used as a control. The size of microcapsules resulting from the homogenization technique, and the various settings were measured using a light microscope and a stage micrometer. The smallest capsules measuring (31.2 microm) were created with the microfluidizer using 26 passes at 1200 psi for 40 min. The greatest loss in viability of 3.21 log CFU/mL was observed when using the ultra-turrax benchtop homogenizer with a speed of 1300 rpm for 5 min. Overall, both homogenization techniques reduced capsule sizes; however, homogenization settings at high rpm also greatly reduced the viability of probiotic organisms.


Asunto(s)
Bifidobacterium/crecimiento & desarrollo , Manipulación de Alimentos/métodos , Alimentos Fortificados/microbiología , Lactobacillus/crecimiento & desarrollo , Microesferas , Probióticos/química , Alginatos/química , Algoritmos , Análisis de Varianza , Recuento de Colonia Microbiana , Emulsiones/química , Microbiología de Alimentos , Ácido Glucurónico/química , Ácidos Hexurónicos/química , Viabilidad Microbiana , Microfluídica/instrumentación , Tamaño de la Partícula , Presión , Factores de Tiempo
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