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1.
Chemosphere ; 238: 124651, 2020 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-31472346

RESUMO

A harbour sediment, previously remediated, was tested for soilless strawberry cultivation (Camarosa and Monterey cultivars), as an innovative, cost-effective and environment-friendly approach of sediment management. Sediments were tested as such (TS100) and mixed 1/1 (v/v) with a peat-based commercial substrate (TS50), using the peat-based medium as control (TS0). Substrates were characterized for some physicochemical properties (e.g. density, porosity and water capacity). Minerals (P, Ca, K, Na and Fe), heavy metals (Cu, Zn, Mn, Ni, Cr, Pb and Cd), aliphatic hydrocarbons (C > 12), polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs), dibenzodioxins and dibenzofurans were analysed in substrates and fruits. Sugars and organic acids, including the ascorbic, were also determined in fruits, as quality indicators. Notwithstanding remediation, sediments showed concentrations of Zn (206 mg kg-1), C > 12 (86 mg kg-1) and PAHs (47 mg kg-1) exceeding the limits established by the Italian L.D. 152/2006, regulating the contamination of soil in green areas, thus making its relocation in the environment not permitted as such. No evidence of fruit contamination by Cr, Pb and Cd was highlighted. Moreover, Cu, Zn and Ni fruit concentrations were comparable among treatments. Conversely, Mn showed statistically higher concentrations in TS0 fruits (56-57 mg kg-1) compared to those grown in sediment-based substrates (8-20 mg kg-1). Among organic contaminants, only dioxin-like PCBs were determined in fruits, at toxic equivalent concentrations fourfold lower than the limit established by the European Union. TS100 fruits showed a yield reduction from 40 to 70% for Camarosa and Monterey, but higher sugar and ascorbic acid contents.


Assuntos
Produtos Agrícolas/normas , Monitoramento Ambiental , Fragaria/metabolismo , Frutas/química , Sedimentos Geológicos/química , Produtos Agrícolas/química , Produtos Agrícolas/crescimento & desenvolvimento , Fragaria/química , Itália , Metais Pesados/análise , Minerais/análise , Bifenilos Policlorados/análise , Hidrocarbonetos Policíclicos Aromáticos/análise , Poluentes do Solo/química
2.
Food Chem ; 305: 125430, 2020 Feb 01.
Artigo em Inglês | MEDLINE | ID: mdl-31518840

RESUMO

The distributions of total soluble solids, pectins, the sum of polyphenolic and terpenoid compounds as well as the antioxidative potency of fruit and their parts, such as peel, flesh, and seeds of Saskatoon berry genotypes are presented in this work. The contents of individual bioactive compounds of in this fruit fraction of Saskatoon berry cultivars and cultivation clones significantly depended on berry genotype and compounds distribution within particular parts of the fruit. The fruit peel contained mainly anthocyanins, polymerized compounds, hydroxycinnamic acids, triterpenoids, and tetraterpenids, as well as exhibited antioxidant activity. The major compounds identified in the fruit flesh included soluble solids, ash, flavonols. In turn, polymeric procyanidins was determined in the seeds of fruit. Individual parts of Saskatoon berry fruit contained many health-promoting constituents and could be deemed attractive materials for the production of functional foods or dietary supplements.


Assuntos
Antioxidantes/análise , Frutas/química , Compostos Fitoquímicos/análise , Rosaceae/química , Antocianinas/análise , Ácidos Cumáricos/análise , Flavonóis/análise , Proantocianidinas/análise , Sementes/química , Terpenos/análise
3.
Sci Total Environ ; 700: 134481, 2020 Jan 15.
Artigo em Inglês | MEDLINE | ID: mdl-31689650

RESUMO

Controlling pesticide residues in marketed fruits and vegetables is an essential issue for food safety and public health. Local governments improve local conditions, like policymaking and implementation, economic structure and development level, and agricultural practices, to control pesticide residues. However, the level of influence and relative importance of these local factors are not analyzed quantitatively. Here we present the food safety level across 42 Chinese cities as measured by the level of pesticide residues (LPR) in fresh fruits and vegetables, and explore how local socio-economic and policy factors influence its intercity variability. A total of 12,070 sample measurements were used in this study. The relationships between LPR and local socio-economic-policy factors were tested by using Pearson correlation analysis, two-sided independent t-test, and stepwise multivariable linear regression. Our analysis shows that: (1) the pesticide residues in 97.1% of the samples were within legal limits, but the LPR had a considerable cross-city disparity and (2) eight socio-economic-policy variables were found to be significantly correlated with LPR at the city level. Six policy-related variables, namely the number of pesticide-related policies, the number of food safety-related policies, the number of food safety-related news reports, the supermarket revolution, the administrative level of the city and the transparency of supervision of food safety, could explain 32.8% of the intercity variability of LPR. This was followed by the gross domestic product (GDP) per capita from the tertiary sector (15.6%) and the pesticide usage per cultivated area in local agriculture (13.4%). After eliminating the collinearity of these variables, local socio-economic-policy factors collectively could explain around 40% of the intercity variability of LPR. This indicates that local-level policy may have a larger impact on local food safety in terms of LPR than economic factors or local agricultural practice, underscoring the critical role of local government in ensuring food safety.


Assuntos
Contaminação de Alimentos/estatística & dados numéricos , Inocuidade dos Alimentos , Frutas/química , Resíduos de Praguicidas/análise , Verduras/química , Agricultura , China
4.
Chemosphere ; 239: 124750, 2020 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-31526995

RESUMO

Perfluoroalkyl substances (PFASs) were investigated in three types of vegetables (fruit, leafy, and root vegetables) that were cultivated and harvested from 2014 to 2017. The cultivated soil was mainly affected by perfluoroalkyl carboxylic acid (PFCAs; 91.8% detection rate) rather than perfluoroalkyl sulfonic acids (PFSAs; 8.2%). The cultivated soil (i.e., a volcanic cohesive soil) had a high total organic carbon (TOC = 3.4%) and therefore showed strong adsorption of long-chain PFASs. Short-chain PFCAs (i.e., under C9) were mainly detected in vegetables; specifically, PFBA showed high concentration in tomato shoots. Principal component analysis (PCA) plots clearly showed that PFASs in vegetables were different from those of cultivated soil, air, and rainwater. Interestingly, the whole potato (i.e., including peel) was in the same group as soil, indicating that the whole potato can easily be affected by the cultivated soil. Energy Dispersive X-ray Spectrometry-Scanning Electron Microscope (EDS-SEM) results showed that presence of unremovable micron-sized cultivated soil particles on the potato surface. Comparing the regional differences between the cultivated area of Tsukuba city (East Japan) and Osaka city (West Japan), PFASs patterns were similar in cucumber but differed in green perilla and potato.


Assuntos
Fluorcarbonetos/análise , Contaminação de Alimentos/análise , Verduras/química , Adsorção , Frutas/química , Japão , Análise de Componente Principal , Chuva , Solo/química , Poluentes do Solo/análise , Espectrometria por Raios X , Poluentes Químicos da Água/análise
5.
Food Chem ; 305: 125437, 2020 Feb 01.
Artigo em Inglês | MEDLINE | ID: mdl-31499290

RESUMO

Total polyphenols and flavonoids content, phenolics profile by HPLC, and antioxidant activity of ten fruit beer produced adding fruits during the fermentation process were analyzed. The fruits were: cherry, raspberry, peach, apricot, grape, plum, orange and apple. Antioxidant activity, total polyphenols and flavonoids content were considerably higher in most of the fruit beers in respect to conventional, no-fruit beers. Cherries beers exhibit the highest values, followed by grape, plum and orange beers. An enrichment was observed in catechin and quercetin content in all fruit beers examined. Myricetin and resveratrol were also detected in most of the fruit beers. Among phenolic acids, an enrichment in chlorogenic, neochlorogenic, p-coumaric and caffeic acids was measured in most of the fruit beers in respect to conventional beers. Our findings show that fruits addition during the fermentation process considerably increased the antioxidant activity of beer and qualitatively and quantitatively improved its phenolics profile.


Assuntos
Antioxidantes/química , Cerveja/análise , Rosaceae/química , Cromatografia Líquida de Alta Pressão , Flavonoides/análise , Flavonoides/química , Frutas/química , Frutas/metabolismo , Fenóis/análise , Fenóis/química , Extratos Vegetais/química , Polifenóis/análise , Polifenóis/química , Rosaceae/metabolismo
6.
Food Chem ; 306: 125630, 2020 Feb 15.
Artigo em Inglês | MEDLINE | ID: mdl-31593892

RESUMO

The Myrtaceae family is one of the world's leading commercial fruit tree families. Among the 121 genera belonging to this family, the Syzygium, Eugenia and Campomanesia genera are constituted by a wide variety of fruit species with great potential to be explored economically, besides presenting excellent nutritional value and being considered sources of phytochemicals such as phenolic compounds, carotenoids and volatile compounds. Many of these phytochemicals have been linked to the prevention and management of several chronic and degenerative diseases including cancer, cardiovascular diseases, type 2 diabetes mellitus, obesity, amnesia among other disorders. In this context, this review discusses about the importance of four fruits species representative of Myrtaceae family such as Syzygium cumini, Syzygium malaccense, Eugenia pyriformis and Campomanesia xanthocarpa, focusing on the nutrients and phytochemical constituents as well as demonstrating their biological effects in order to stimulate the cultivation and consumption of these fruits.


Assuntos
Myrtaceae/química , Frutas/química , Valor Nutritivo , Compostos Fitoquímicos/análise , Árvores
7.
Food Chem ; 306: 125640, 2020 Feb 15.
Artigo em Inglês | MEDLINE | ID: mdl-31606625

RESUMO

Combination of pesticides; acetamiprid, flutolanil and etofenprox are usually used for tomato fruits for protecting them against pest infection. Generally, pesticides, residues could be one of the health hazard sources. Two specific simple sensitive chromatographic methods are developed for simultaneous estimation of the concerning pesticides' residues using simple economic steps of field sample preparation. The first method is HP- TLC method. Hexane: methanol: acetone: glacial acetic acid (8:2:0.5:0.1, by volume) is proposed as a developing system. The second one is RP- HPLC. Acetonitrile: water (75:25, v/v) is proposed as a mobile phase. The recommended methods are completely validated regarding ICH guidelines. Their means percentages and standard deviations of accuracy range 100.32 ±â€¯0.89 to 99.27 ±â€¯0.9. The methods' repeatability and intermediate precision relative standard deviation percentages range 0.395-0.894. They are successfully applied for estimating the pesticides in pure and commercial forms and field samples.


Assuntos
Manipulação de Alimentos , Lycopersicon esculentum/química , Resíduos de Praguicidas/análise , Piretrinas/análise , Cromatografia Líquida de Alta Pressão/métodos , Frutas/química , Segurança
8.
Food Chem ; 306: 125623, 2020 Feb 15.
Artigo em Inglês | MEDLINE | ID: mdl-31606633

RESUMO

In this study, apple juice was fermented using Hanseniaspora osmophila X25-5 in pure culture as well as mixed culture with Torulaspora quercuum X24-4, which was inoculated simultaneously or sequentially. H. osmophila inhibited the growth of T. quercuum, while T. quercuum had little effect on the growth of H. osmophila. The simultaneous fermentation consumed relatively more sugar and resulted in the highest ethanol content. The production of organic acids varied depending on the yeast species employed and inoculation modality. Esters and alcohols were the main volatile families produced during fermentation, while ethyl esters and terpenes contributed most to the temperate fruity aroma. Gas chromatography-olfactometry (GC-O) showed that 3-methyl-1-butanol, ethyl 2-methylbutanoate, phenylethyl alcohol, ß-phenethyl acetate, and ß-damascenone were the most potent odorants in all samples. This study suggested that simultaneous fermentation with H. osmophila and T. quercuum might represent a novel strategy for the future production of cider.


Assuntos
Acetatos/análise , Fermentação , Hanseniaspora/metabolismo , Malus/metabolismo , Odorantes/análise , Torulaspora/metabolismo , Bebidas Alcoólicas , Cromatografia Gasosa , Ésteres/análise , Frutas/química , Norisoprenoides/análise , Olfatometria , Vinho/análise
9.
Food Chem ; 306: 125635, 2020 Feb 15.
Artigo em Inglês | MEDLINE | ID: mdl-31606637

RESUMO

The production of commercial cold pressed avocado oil (CPAO) generates large quantity of organic wastes such as pomace, seeds, peels and wastewater. During the early harvest season, for every 1000 kg of avocado fruits processed, roughly 80 kg of oil is produced and wastewater accounted for the highest proportion (500 kg). Therefore, it is important to find an alternative application for this wastewater rather than its direct disposal into landfills. Proximate analysis, total phenolic content (TPC) and antioxidant assays were conducted on the avocado wastes. Avocado wastewater (AWW) was spray dried into powder at different temperatures from 110 °C to 160 °C, which concomitantly increased the TPC and antioxidant capacities of the AWW powder. The powder was further applied as a preservative in pork sausages and was found to be effective in preventing lipid oxidation.


Assuntos
Conservantes de Alimentos , Resíduos Industriais , Persea/química , Animais , Antioxidantes/química , Frutas/química , Produtos da Carne , Oxirredução , Fenóis/química , Sementes/química , Suínos
10.
Food Chem ; 306: 125634, 2020 Feb 15.
Artigo em Inglês | MEDLINE | ID: mdl-31614291

RESUMO

The effects of postharvest treatments with γ-aminobutyric acid (GABA), methyl jasmonate (MeJA) or methyl salicylate (MeSA) on antioxidant systems and sensory quality of blood oranges during cold storage were evaluated (150 days at 3 °C plus 2 days at 20 °C, shelf life). Fruit firmness, titratable acidity (TA), total antioxidant activity (TAA) and ascorbic acid (AA) decreased during cold storage, all these changes being delayed in treated fruit, with the greatest differences observed with the 50 µmol L-1 MeJA and 100 µmol L-1 MeSA treatments. Total phenolic content (TPC), total anthocyanin content (TAC) and the major individual anthocyanins, cyanidin 3-glucoside and cyanidin 3-(6″-malonylglucoside), were found at higher concentration in treated fruit than in control during the whole cold storage period. Overall, 100 µmol L-1 MeSA was the most effective for maintaining fruit quality and maintained higher anthocyanin concentration due to higher phenylalanine ammonia-lyase (PAL) and lower polyphenol oxidase (PPO) activities.


Assuntos
Acetatos/farmacologia , Citrus sinensis/metabolismo , Ciclopentanos/farmacologia , Conservação de Alimentos , Oxilipinas/farmacologia , Salicilatos/farmacologia , Ácido gama-Aminobutírico/farmacologia , Antocianinas/metabolismo , Catecol Oxidase/metabolismo , Citrus sinensis/química , Citrus sinensis/efeitos dos fármacos , Temperatura Baixa , Frutas/química , Frutas/metabolismo , Glucosídeos/metabolismo , Valor Nutritivo , Fenilalanina Amônia-Liase/metabolismo
11.
Food Chem ; 306: 125628, 2020 Feb 15.
Artigo em Inglês | MEDLINE | ID: mdl-31629297

RESUMO

Microencapsulation of Zingiber officinale essential oil (EO) in polysaccharide, chitosan (CH) and sodium carboxymethyl cellulose (CMC) based on the electrostatic interaction between charged polysaccharides at pH 3.0 in dual delivery system. Ratio variations of CH and CMC in microencapsulation were studied at 1:2, 2:1 and 1:1. This study aimed to evaluate the influence of the encapsulating materials combination on freeze-dried EO powders and to present the mechanisms for loading and releasing EO involved in the preparation of CH/CMC microcapsules. The spectroscopy analysis, physical properties, microstructural, encapsulation efficiency and EO release behavior in obtained EO microparticles were evaluated by using the analysis of fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM) and gas chromatography mass spectrometry (GC-MS), respectively. Afterwards, the above prepared microcapsules were applied on winter jujube fruit (Ziziphus jujuba Mill.) preservation. Results demonstrated that both the microstructure and stability of microencapsulation were improved in delivery system loading with CH and CMC (1:1) with the encapsulation efficiency of 88.50%, compared to other ratios of CH and CMC (1:2 and 2:1). Furthermore, the microencapsulation had a capacity to control and reduce the EO release, therefore the morphological and sensory quality of jujube fruits in EO delivery system during storage was enhanced significantly (P < 0.05), in comparison to control. Results revealed that the microparticles produced with CH and CMC (1:1) was considered to present better characteristics of microstructure, encapsulation efficiency, as well as to maintain higher nutritional quality for jujube fruit. Thus, EO microencapsulation loaded in CH/CMC-based dual delivery system has potential application and developmental value prospects in food industries.


Assuntos
Gengibre/química , Óleos Voláteis/química , Ziziphus/química , Cápsulas/análise , Quitosana/análogos & derivados , Quitosana/química , Frutas/química
12.
Food Chem ; 306: 125455, 2020 Feb 15.
Artigo em Inglês | MEDLINE | ID: mdl-31629968

RESUMO

The present research reported a facile strategy for the synthesis of a novel magnetic covalent organic frameworks (Fe3O4@COF(TpDA)) material and applied it as a sorbent for magnetic solid phase extraction of plant growth regulators from fruits and vegetables. The prepared Fe3O4@COF materials showed many attractive features involving large specific surface area (180.2 m2/g) and high saturation magnetization (62.3 emu/g), which enabled it an ideal sorbent for sample pretreatment. The experimental conditions affecting the extraction performance were optimized systematically, including eluent, amount of sorbent, adsorption time and desorption time. The extracted samples were detected by HPLC-DAD. Under the optimized conditions, the proposed method exhibited good linearity (R ≥ 0.9990) and low limits of detection (4.68-7.51 µg/L). Satisfactory recoveries were calculated to be 83.0-105.0%. Finally, the proposed method was successfully applied to determination of plant growth regulators in fruits and vegetables, indicating the potential prospect of the Fe3O4@COF(TpDA) materials in sample pretreatment.


Assuntos
Frutas/química , Estruturas Metalorgânicas/análise , Reguladores de Crescimento de Planta/análise , Verduras/química , Cromatografia Líquida de Alta Pressão/métodos , Limite de Detecção , Magnetismo/métodos , Imãs , Extração em Fase Sólida/métodos
13.
Food Chem ; 306: 125451, 2020 Feb 15.
Artigo em Inglês | MEDLINE | ID: mdl-31634767

RESUMO

Gluten-free (GF) breads often lack proteins, minerals and fibres and have an imbalanced energy value, as they are primarily based on flour or starch. To nutritionally fortify GF bread, dietary fibres from milling and fruit processing by-products can be utilized. However, fibre addition changes sensorial, nutritional and also technological properties, such as dough or batter hydration. This review evaluates and compares different methods for quantifying the hydration properties of GF fibres and the resulting batters. Revelations are that the hydration properties of fibres vary greatly, depending on the utilized measuring technique, thus impeding the calculation of the appropriate water amount for GF batter processing. In addition, bran and fibres increase the loss factor tan δ and delay thermal transformation, compromising the specific loaf volume. Finally, operational strategies, such as enzymatic or extrusion treatments are discussed regarding their efficiency to increase water absorption in order to further improve GF bread quality.


Assuntos
Pão/análise , Dieta Livre de Glúten , Fibras na Dieta/análise , Farinha/análise , Frutas/química , Humanos , Amido/análise , Água/química
14.
Food Chem ; 305: 125483, 2020 Feb 01.
Artigo em Inglês | MEDLINE | ID: mdl-31610420

RESUMO

Kiwifruit (Actinidia deliciosa cv. Jinkui) were treated with 0.1 mmol/L methyl jasmonate (MeJA) to investigate the effects on disease resistance to soft rot caused by Botryosphaeria dothidea. The results showed that MeJA treatment significantly reduced the diameter of lesions after inoculation with B. dothidea. This treatment significantly enhanced the activities of related antioxidant protective enzymes, defence-related enzymes including catalase (CAT), peroxidase (POD), superoxide dismutase (SOD), polyphenol oxidase (PPO), chitinase (CHI), ß-1,3 glucanase (GLU) and increased the accumulation of total phenolic content, while the degree of membrane lipid peroxidation was reduced. MeJA treatment effectively enhanced gene expression of AcPOD, AcSOD, AcCHI and AcGLU. The results from this research suggest that MeJA treatment is a promising and safe strategy for controlling postharvest rot soft of kiwifruit.


Assuntos
Acetatos/farmacologia , Actinidia/microbiologia , Ascomicetos/efeitos dos fármacos , Ciclopentanos/farmacologia , Resistência à Doença/efeitos dos fármacos , Oxilipinas/farmacologia , Actinidia/química , Actinidia/metabolismo , Ascomicetos/fisiologia , Quitinases/genética , Quitinases/metabolismo , Frutas/química , Frutas/metabolismo , Frutas/microbiologia , Expressão Gênica/efeitos dos fármacos , Peroxidação de Lipídeos/efeitos dos fármacos , Peroxidase/genética , Peroxidase/metabolismo , Fenóis/análise , Superóxido Dismutase/genética , Superóxido Dismutase/metabolismo
15.
Food Chem ; 305: 125477, 2020 Feb 01.
Artigo em Inglês | MEDLINE | ID: mdl-31610424

RESUMO

In recent years there is an increasing interest in dried fruits, although many of their nutritional components are readily lost during drying. The novelty of this paper was to assess the effect of hot-air drying (HAD) and far-infrared drying (FIRD) on the physicochemical properties and microstructure of mango slices pretreated with: control; 0.1% citric acid + 0.5% ascorbic acid + 0.5% CaCl2 + 1% NaCl; or 0.1% citric acid + 0.5% ascorbic acid + 0.5% CaCl2 + 1% NaCl + ultrasound treatments. Pretreatments resulted in a significant (p < 0.05) increase in reducing sugar, ascorbic acid and total phenol contents of dried samples. Moreover, compared with HAD, FIRD maintained a higher phenolic acid content, improved the nutrient retention and color attributes and better preserved microstructure. Therefore, pretreatments followed by FIRD is a potential method for obtaining high-quality dried mango slices.


Assuntos
Ácido Ascórbico/análise , Dessecação/métodos , Mangifera/química , Fenóis/análise , Ar , Cloreto de Cálcio/química , Cromatografia Líquida de Alta Pressão , Cor , Frutas/química , Frutas/metabolismo , Temperatura Alta , Raios Infravermelhos , Mangifera/metabolismo , Mangifera/ultraestrutura , Espectrometria de Massas , Sonicação
16.
Food Chem ; 306: 125611, 2020 Feb 15.
Artigo em Inglês | MEDLINE | ID: mdl-31606631

RESUMO

Aromatic secondary metabolites are closely related to quality attributes of postharvest fruit. In the present study, 20% CO2 was applied to strawberry fruit to investigate the regulation of elevated CO2 on aromatic secondary metabolites. The results showed that elevated CO2 delayed accumulations of anthocyanins, eugenol and lignin. Phenylalanine and tyrosine, the precursors of the above secondary metabolites, were 18.90% and 35.61%, respectively, lower in CO2-treated fruit compared with the control on day 6. Furthermore, enzyme activities and transcriptional profiles analysis showed pentose phosphate pathway and glycolysis were activated by elevated CO2 whereas the aromatic amino acids (AAAs) pathway was inhibited. These results indicated that elevated CO2 restricted carbon flux into aromatic secondary metabolism by inhibiting the AAAs pathway, leading to the decrease of phenylalanine and tyrosine, and thus, delayed the accumulation of aromatic secondary metabolites. In addition, the effect of elevated CO2 was eliminated after transferred CO2-treated fruit to air.


Assuntos
Fragaria/metabolismo , Antocianinas/análise , Antocianinas/metabolismo , Dióxido de Carbono/química , Eugenol/análise , Eugenol/metabolismo , Fragaria/química , Frutas/química , Frutas/metabolismo , Lignina/análise , Lignina/metabolismo
17.
Food Chem ; 307: 125550, 2020 Mar 01.
Artigo em Inglês | MEDLINE | ID: mdl-31639575

RESUMO

Modified atmosphere has widely been evident to contribute to fruit quality maintenance, however the correlation among these quality traits was less known. To explore main factors of elevated atmosphere and reduce the detection indexes, we exposed strawberry to either high O2 (80% O2 + 20% N2) or CO2 (20% CO2 + 20% O2 + 60% N2) atmosphere and compared quality characteristics. It was demonstrated that both atmospheres well maintained the fruit firmness, alleviated weight loss and decay rate. Elevated O2 maintained the polyphenolic contents and cell integrity by significantly decreasing superoxide and hydrogen peroxide levels. PCA analysis implied that HO treatment mainly affected oxygen metabolism while HCO affected carbon metabolism more. Significantly positive correlation was observed between weight loss, anthocyanin content and decay rate in elevated O2 and control groups. This study provided new insights into correlation and difference between impact of elevated O2 and CO2 to postharvest preservation.


Assuntos
Armazenamento de Alimentos , Fragaria/química , Oxigênio/química , Antocianinas/metabolismo , Dióxido de Carbono/química , Fragaria/metabolismo , Frutas/química , Peróxido de Hidrogênio/metabolismo , Superóxidos/metabolismo
18.
Food Chem ; 308: 125592, 2020 Mar 05.
Artigo em Inglês | MEDLINE | ID: mdl-31648086

RESUMO

This paper investigated the conformational and functional properties of myofibrillar protein modified by five phenolic compounds, including cyanidin 3-O-glucoside, cyanidin 3-O-rutinoside, caffeic acid, quercetin and rutin, dominantly presented in mulberry polyphenols-enriched sausage. These phenolic compounds significantly affected the structure of myofibrillar protein as indicated by the remarkable losses of carbonyl and ε-NH2 and the obviously fluorescence quenching effect (P < 0.05). Modified myofibrillar protein increased antioxidative activity but decreased thermal stability. Myofibirllar protein modified with rutin had no change in thermal stability but improved emulsifying properties. Quercetin has little effect on secondary structure of myofibirlliar protein. Caffeic acid triggered the conversion of α-helix to ß-sheet in myofibrillar protein, and the resulted protein exhibited the strongest fluorescence quenching, solubility and antioxidant activity among all samples. Overall, the results suggested that all phenolic compounds involved in the changes of meat product quality, with caffeic acid and rutin being the most critical ones.


Assuntos
Morus/química , Extratos Vegetais/química , Polifenóis/química , Proteínas/química , Frutas/química , Estrutura Secundária de Proteína , Estrutura Terciária de Proteína
19.
Food Chem ; 308: 125570, 2020 Mar 05.
Artigo em Inglês | MEDLINE | ID: mdl-31648089

RESUMO

The effect of pre-treatment (dipping and vacuum impregnation in lemon juice solution), freezing and frozen storage (FS) on single and total polyphenols (free and conjugated) content and antioxidant activity (AOA) of organic and conventional apples, was investigated. Fresh organic and conventional fruits showed different profiles of free and conjugated polyphenols while their total phenolic content and AOA were similar. Organic and conventional apple tissues showed different physiological responses to physical stresses described by changes in phenolic profiles. Vacuum impregnation in lemon juice affected the polyphenols extractability of both the organic and conventional apples and favored their enrichment with bioactive compounds (AOA = +11.5%). FS decreased the single and conjugated polyphenols content of the pre-treated apple samples and the effect was different between organic and conventional fruits. After FS, not pre-treated organic apples showed a lower AOA reduction than the conventional ones (-13% vs -25%), while no differences were found on pre-treated samples.


Assuntos
Antioxidantes/análise , Malus/química , Polifenóis/análise , Citrus/química , Alimentos Orgânicos/análise , Congelamento , Frutas/química , Sucos de Frutas e Vegetais , Vácuo
20.
Food Chem ; 308: 125522, 2020 Mar 05.
Artigo em Inglês | MEDLINE | ID: mdl-31669945

RESUMO

Date palm is an important fruit bearing tree grown widely in the arid and semi-arid regions of the world. The date fruit and its by-products, such as seeds, have both nutritional and medicinal value. However, date fruit and seeds have not been fully considered as potential functional food ingredients to develop foods with promising health benefits. Based on the available information in the literature, fruit and seed of date palm are rich in phytochemicals, such as phenolics, anthocyanin, carotenoids, tocopherols, tocotrienols, phytosterols and dietary fiber. In addition, they were reported to possess several beneficial health properties explored under in-vitro and in-vivo conditions. Further research in this area would provide valuable information for the potential utilization of date fruit and seed as functional food ingredients. This review presents a comprehensive information about the bioactive compounds and nutraceutical properties of different varieties of date fruit and seed, as well as the potential for using them as functional food ingredients.


Assuntos
Phoeniceae/química , Animais , Fibras na Dieta/análise , Ingredientes de Alimentos , Frutas/química , Alimento Funcional , Humanos , Compostos Fitoquímicos/análise , Sementes/química
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