Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 17 de 17
Filtrar
1.
Int J Food Microbiol ; 405: 110344, 2023 Nov 16.
Artigo em Inglês | MEDLINE | ID: mdl-37544194

RESUMO

The brackish river prawn (Macrobrachium macrobrachion) is a species of commercial importance in West Africa. However, like other fishery products, it is prone to deterioration due mainly to microbial activities. The present study aimed at evaluating the spoilage characteristics of M. macrobrachion and predicting the growth of the main spoilage bacteria as well as the shelf-life of the product as a function of storage temperature. Freshly caught brackish river prawn samples from Lake Aheme were aerobically stored at 0, 7, 15, and 28 °C and, at pre-determined times during storage, they were taken for microbiological, chemical, and sensory analysis. At sensory rejection times, the spoilage potential of 185 isolates from specific groups of organisms enumerated was assessed in prawn of which the endogenous microbiota was heat inactivated. Isolates capable of producing strong off-odor were identified using 16S rRNA sequencing. Models predicting the maximum growth rate of Pseudomonas spp. and H2S-producing bacteria in the brackish river prawn as well as the shelf-life of the product were developed. These models were validated using an independent experiment during which prawn was stored at 0, 4, 10, and 25 °C. Results showed that Pseudomonas spp. at 0 °C, Pseudomonas spp. and H2S-producing bacteria at 7 °C, and H2S-producing bacteria at 15 °C and 28 °C were the dominant groups of microorganisms during storage. As expected, total volatile basic nitrogen, trimethylamine, and pH with initial values of 21.2 ± 3.0 mg-N/100 g, 4.1 ± 0.8 mg-N/100 g, and 7.46 ± 0.15 increased during storage reaching approximately 35 mg-N/100 g, 10 mg/ 100 g and 8, respectively at sensory rejection times which were 7 h at 28 °C, 1.2 d at 15 °C, 4.6 d at 7 °C, and 11.7 d at 0 °C. The main spoilage organisms were Citrobacter braakii at 28 °C, Citrobacter braakii, Pseudomonas kurunegalensis, and Shewanella bicestrii at 15 °C, Shewanella putrefaciens, Shewanella baltica, and Pseudomonas bubulae at 7 °C, and Pseudomonas versuta at 0 °C. The validation of the developed models showed an adequate agreement between the predicted and observed values. This study highlights the specific spoilage characteristics of the brackish river prawn and reveals that Gram-negative rod bacteria are the main spoilage organisms even at high storage temperatures, contrary to many earlier reports on the spoilage of tropical fishery products.


Assuntos
Palaemonidae , Penaeidae , Animais , Temperatura , Palaemonidae/genética , RNA Ribossômico 16S/genética , Citrobacter/genética , Bactérias , Microbiologia de Alimentos , Conservação de Alimentos/métodos
2.
World J Microbiol Biotechnol ; 37(2): 34, 2021 Jan 21.
Artigo em Inglês | MEDLINE | ID: mdl-33475896

RESUMO

Spontaneous cereal fermentations involve diverse lactic acid bacteria (LAB) and yeasts which may include multifunctional and safe or unsafe strains. This study assessed acidification ability, safety, antifungal activity and free amino acids release ability of LAB and yeasts previously isolated from spontaneously fermented cereal doughs in Benin. Fourteen LAB and thirteen yeast strains were studied in liquid media and/or in a model cereal dough prepared in laboratory conditions. Antifungal activity was assessed against Candida glabrata in liquid medium. Amino acids were determined by pre-column derivatization and separation with reversed-phase HPLC. Antimicrobial susceptibility was analysed by minimum inhibitory concentration determination. The acidification ability was higher for LAB compared to yeast strains. All LAB strains retarded the growth of C. glabrata Cg1 with the highest inhibition recorded for Weissella confusa Wc1 and Wc2. The highest free amino acid content was found in the doughs fermented with Pichia kudriavzevii Pk2 and Pk3. All the LAB strains were susceptible to ampicillin, chloramphenicol, erythromycin, but displayed phenotypic resistance to kanamycin, streptomycin and tetracycline. Positive PCR amplicon of resistance genes were detected in the following cases: 2 LAB strains were positive for kanamycin (aph(3)III), 5 strains were positive for streptomycin (aadA and/or strA and/or strB) and 3 strains were positive for tetracycline (tet (L) and/or tet (M)). For yeasts, most of the P. kudriavzevii strains were resistant to amphotericin B, fluconazole and itraconazole opposite to K. marxianus and Saccharomyces cerevisiae strains which were susceptible. The results obtained are valuable for selecting safe and multifunctional strains for cereal fermentation in West Africa.


Assuntos
Aminoácidos/farmacologia , Grão Comestível/microbiologia , Fungos/isolamento & purificação , Lactobacillales/isolamento & purificação , Aminoácidos/isolamento & purificação , Antibacterianos/farmacologia , Benin , Candida glabrata/efeitos dos fármacos , Candida glabrata/crescimento & desenvolvimento , Cromatografia de Fase Reversa , Farmacorresistência Bacteriana Múltipla , Farmacorresistência Fúngica Múltipla , Fermentação , Fungos/classificação , Fungos/metabolismo , Lactobacillales/classificação , Lactobacillales/metabolismo , Testes de Sensibilidade Microbiana , Weissella/efeitos dos fármacos , Weissella/crescimento & desenvolvimento
3.
Matern Child Nutr ; 16(2): e12906, 2020 04.
Artigo em Inglês | MEDLINE | ID: mdl-31833230

RESUMO

Dietary diversity before and during pregnancy is crucial to ensure optimal foetal health and development. We carried out a cohort study of women of reproductive age living in the Sô-Ava and Abomey-Calavi districts (Southern Benin) to investigate women's changes in dietary diversity and identify their determinants both before and during pregnancy. Nonpregnant women were enrolled (n = 1214) and followed up monthly until they became pregnant (n = 316), then every 3 months during pregnancy. One 24-hr dietary recall was administered before conception and during each trimester of pregnancy. Women's dietary diversity scores (WDDS) were computed, defined as the number of food groups out of a list of 10 consumed by the women during the past 24 hr. The analysis included 234 women who had complete data. Mixed-effects linear regression models were used to examine changes in the WDDS over the entire follow-up, while controlling for the season, subdistrict, socio-demographic, and economic factors. At preconception, the mean WDDS was low (4.3 ± 1.1 food groups), and the diet was mainly composed of cereals, oils, vegetables, and fish. The mean WDDS did not change during pregnancy and was equally low at all trimesters. Parity and household wealth index were positively associated with the WDDS before and during pregnancy in the multivariate analysis. Additional research is needed to better understand perceptions of food consumption among populations, and more importantly, efforts must be made to encourage women and communities in Benin to improve the diversity of their diets before and during pregnancy.


Assuntos
Dieta/métodos , Inquéritos Nutricionais/métodos , Estado Nutricional , Adulto , Fatores Etários , Benin , Estudos de Coortes , Dieta/estatística & dados numéricos , Registros de Dieta , Feminino , Humanos , Inquéritos Nutricionais/estatística & dados numéricos , Gravidez , Estações do Ano , População Urbana , Adulto Jovem
4.
Int J Food Microbiol ; 304: 75-88, 2019 Sep 02.
Artigo em Inglês | MEDLINE | ID: mdl-31174038

RESUMO

Fermented cereal doughs constitute a predominant part of West African diets. The environment of fermented doughs can be hostile for microbial survival due to high levels of microbial metabolites such as weak carboxylic organic acids and ethanol. In order to get a better understanding of the intrinsic factors affecting the microbial successions of yeasts during dough fermentation, survival and physiological responses of the yeasts associated with West African fermented cereal doughs were investigated at exposure to relevant concentrations of microbial inhibitory compounds. Three strains each of the predominant species, i.e. Saccharomyces cerevisiae, Kluyveromyces marxianus, Pichia kudriavzevii as well as the opportunistic pathogen Candida glabrata were studied. The strains were exposed to individual stress factors of cereal doughs, i.e. (i) pH 3.4, (ii) 3% (v/v) ethanol (EtOHpH3.4), (iii) 285 mM lactic acid (LApH3.4) and (iv) 150 mM acetic acid (AApH3.4) as well as to combinations of these stress factors, i.e. (v) (LA + AA)pH 3.4 and (vi) (LA + AA+EtOH)pH 3.4. Growth and single cell viability were studied by flow cytometry using combined SYTO 13 and propidium iodide (PI) staining. Intracellular pH (pHi), plasma membrane integrity and micro-colony development of stressed cells were studied by fluorescence microscopy using PI and carboxyfluorescein diacetate succinimidyl ester (CFDA-se). Viability of the yeast strains was not affected by pH 3.4 and 3% (v/v) ethanol (EtOHpH3.4). 285 mM lactic acid (LApH3.4) reduced the specific growth rate (µmax) from 0.27-0.41 h-1 to 0.11-0.26 h-1 and the viability from 100% to 2.6-41.7% at 72 h of exposure in most yeast strains, except for two strains of C. glabrata. 150 mM acetic acid (AApH3.4) as well as the combinations (LA + AA)pH 3.4 and (LA + AA+EtOH)pH 3.4 reduced µmax to 0.0 h-1 and induced significant cell death for all the yeast strains. Exposed to (LA + AA+EtOH)pH 3.4, the most resistant yeast strains belonged to S. cerevisiae followed by P. kudriavzevii, whereas C. glabrata and K. marxianus were more sensitive. Strain variations were observed within all four species. When transferred to non-stress conditions, i.e. MYGP, pH 5.6, after exposure to (LA + AA+EtOH)pH 3.4 for 6 h, 45% of the single cells of the most resistant S. cerevisiae strain kept their plasma membrane integrity, recovered their pHi to near physiological range (pHi = 6.1-7.4) and resumed proliferation after 3-24 h of lag phase. The results obtained are valuable in order to change processing conditions of the dough to favor the survival of preferable yeast species, i.e. S. cerevisiae and K. marxianus and inhibit opportunistic pathogen yeast species as C. glabrata.


Assuntos
Candida/efeitos dos fármacos , Grão Comestível/microbiologia , Alimentos Fermentados/microbiologia , Kluyveromyces/efeitos dos fármacos , Viabilidade Microbiana/efeitos dos fármacos , Pichia/efeitos dos fármacos , Saccharomyces cerevisiae/efeitos dos fármacos , Ácido Acético/farmacologia , Reatores Biológicos , Candida/crescimento & desenvolvimento , Candida/isolamento & purificação , Etanol/farmacologia , Fermentação , Kluyveromyces/crescimento & desenvolvimento , Kluyveromyces/isolamento & purificação , Ácido Láctico/farmacologia , Pichia/crescimento & desenvolvimento , Pichia/isolamento & purificação , Saccharomyces cerevisiae/crescimento & desenvolvimento , Saccharomyces cerevisiae/isolamento & purificação , Fermento Seco , Leveduras/isolamento & purificação
5.
Food Microbiol ; 76: 267-278, 2018 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-30166150

RESUMO

Mawè is a West African spontaneous fermented cereal-based dough. Different types of mawè exist varying in type of cereal and/or production condition, with fermentations lasting 24-48 h. With the aim of obtaining a comprehensive understanding of the microbial ecology of mawè processing, a microbiological characterisation was performed for four mawè types, produced at eight sites in Benin. At the onset of the fermentations lactic acid bacteria (LAB) and yeast counts were on average 7.5 ±â€¯1.03 and 4.8 ±â€¯0.79 Log10 cfu/g, which increased to 9.2 ±â€¯0.38 and 7.4 ±â€¯0.42 Log10 cfu/g, respectively, at the end of the fermentations. LAB (n = 321) and yeasts (n = 298), isolated during the fermentations, were identified. The predominant LAB and yeast species were Lactobacillus fermentum and Pichia kudriavzevii, respectively, followed by Kluyveromyces marxianus, all present throughout the mawè fermentations. Further, microbial successions took place with Weissella confusa occurring mostly at the onset, while Pediococcus acidilactici and Saccharomyces cerevisiae were mainly associated with the end of the fermentations. Species diversity was influenced both by type of cereal and production condition. The dominating strain clusters of L. fermentum and P. kudriavzevii were ubiquitous and strain diversities were influenced by type of cereal and production site.


Assuntos
Grão Comestível/microbiologia , Fermentação , Alimentos Fermentados/microbiologia , Lactobacillaceae/isolamento & purificação , Leveduras/isolamento & purificação , Candida/isolamento & purificação , Candida/metabolismo , Microbiologia de Alimentos , Ácido Láctico/análise , Lactobacillaceae/classificação , Lactobacillaceae/metabolismo , Limosilactobacillus fermentum/isolamento & purificação , Pichia/isolamento & purificação , Pichia/metabolismo , Saccharomyces cerevisiae/isolamento & purificação , Saccharomyces cerevisiae/metabolismo , Leveduras/classificação , Leveduras/metabolismo
6.
J Sci Food Agric ; 98(2): 439-455, 2018 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-28731216

RESUMO

This paper reviews indigenous Beninese food resources as potential ingredients for complementary infant foods with the aim to develop affordable formulations for low-income households in each agro-ecological zone of the country. Potential ingredients were selected on their documented nutritional value. The selected foods encompass 347 food resources, namely 297 plant products from home gardens or collected from natural vegetation and 50 animals, either domesticated or from the wild. The compiled data reveal that the distribution of the available food resources was unbalanced between agro-ecological zones. Only a few animal ingredients are obtainable in northern Benin. Most resources are seasonal, but their availability may be extended. A high variation was observed in energy and nutrient contents. Antinutritional factors were identified in some resources, but processing techniques were reported to reduce their presence in meals. In general, ingredients from local tree foods (Adansonia digitata, Parkia biglobosa) were adequate as sources of nutrients for complementary infant foods. Based on this review, local foods for the development of complementary food formulas for Beninese infants and children may be selected for each agro-ecological zone. The approach used is exemplary for other sub-Saharan African countries in need of complementary infant foods. © 2017 Society of Chemical Industry.


Assuntos
Ingredientes de Alimentos/normas , Alimentos Formulados/normas , Alimentos Infantis/normas , Transtornos da Nutrição do Lactente/prevenção & controle , Benin/epidemiologia , Ingredientes de Alimentos/análise , Alimentos Formulados/análise , Humanos , Lactente , Alimentos Infantis/análise , Transtornos da Nutrição do Lactente/epidemiologia , Transtornos da Nutrição do Lactente/metabolismo
7.
J Nutr ; 146(1): 114-23, 2016 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-26609168

RESUMO

BACKGROUND: Three commonly recommended indicators for risk assessment of population zinc deficiency are stunting rates among children aged <5 y, prevalence of inadequate dietary zinc intake, and prevalence of low plasma zinc (PZn). Data on zinc status in Benin are mainly drawn from stunting rates and data on PZn and dietary zinc intake are lacking. OBJECTIVES: The aims of this study were 1) to assess the risk of zinc deficiency in preschool and school-age children from rural communities in northern Benin by means of the 3 indicators for population assessment, 2) to evaluate their level of agreement, and 3) to identify predictors of PZn and height-for-age z scores (HAZ). METHODS: We analyzed preintervention data collected during 2 efficacy trials and cross-sectionally assessed the risk of zinc deficiency in preschool (1-5 y, n = 326) and school-age children (5-10 y, n = 272) by 1) conducting a 3-d weighed food record survey, coupled with direct zinc and phytic acid analysis of consumed foodstuffs, and calculating usual dietary zinc intakes in a subsample of school-age children (n = 36); 2) analyzing PZn in all children (n = 598); and 3) measuring anthropometry indexes for assessment of stunting (HAZ <-2 SD) in all children (n = 594) and in <5-y-old children only (n = 273). We derived predictors of PZn and HAZ by using multivariate regression with mixed-effect models. RESULTS: Prevalence of inadequate intakes of zinc ranged from 11% to 80% depending on whether the estimated average requirements (EARs) by the International Zinc Nutrition Consultative Group or the EARs derived from the WHO's recommended nutrient intakes were used. Prevalence of low PZn adjusted for acute-phase protein status was 45.7%, with higher rates among preschoolers than school-age children (P = 0.002). The stunting rate in <5-y-old children was 51.3%. PZn was predicted by age, methodologic factors, and socioeconomic status, whereas HAZ was predicted by age, sex, hemoglobin, and socioeconomic status. CONCLUSIONS: The prevalence of <5-y stunting and the prevalence of low PZn indicate that the risk of zinc deficiency is elevated in this population. Risk estimates based on the prevalence of inadequacy of zinc intakes varied depending on the EARs used, and a consensus would facilitate nutrition survey evaluations. These trials were registered at clinicaltrials.gov as NCT01472211 and NCT01790321.


Assuntos
Dieta , Transtornos do Crescimento/epidemiologia , População Rural , Zinco/deficiência , Proteínas de Fase Aguda , Benin/epidemiologia , Criança , Fenômenos Fisiológicos da Nutrição Infantil , Pré-Escolar , Estudos Transversais , Inquéritos sobre Dietas , Feminino , Transtornos do Crescimento/sangue , Hemoglobinas , Humanos , Masculino , Análise Multivariada , Necessidades Nutricionais , Estado Nutricional , Ácido Fítico/administração & dosagem , Ácido Fítico/sangue , Prevalência , Fatores Socioeconômicos , Zinco/administração & dosagem , Zinco/sangue
8.
Int J Food Microbiol ; 218: 96-104, 2016 Feb 02.
Artigo em Inglês | MEDLINE | ID: mdl-26656527

RESUMO

This study aimed at determining bacterial concentration and diversity in fresh tropical shrimps (Penaeus notialis) and their surrounding brackish waters and sediment. Freshly caught shrimp, water and sediment samples were collected in Lakes Nokoue and Aheme in Benin (West Africa) during two periods with different water salinity and temperature. We used complementary culture-dependent and culture-independent methods for microbiota analysis. During both sampling periods, total mesophilic aerobic counts in shrimp samples ranged between 4.4 and 5.9 log CFU/g and were significantly higher than in water or sediment samples. In contrast, bacterial diversity was higher in sediment or water than in shrimps. The dominant phyla were Firmicutes and Proteobacteria in shrimps, Firmicutes, Proteobacteria, and Actinobacteria in water, and Proteobacteria and Chloroflexi in sediment. At species level, distinct bacterial communities were associated with sediment, water and shrimps sampled at the same site the same day. The study suggests that the bacterial community of tropical brackish water shrimps cannot be predicted from the microbiota of their aquatic environment. Thus, monitoring of microbiological quality of aquatic environments might not reflect shrimp microbiological quality.


Assuntos
Sedimentos Geológicos/microbiologia , Microbiota/genética , Penaeidae/microbiologia , Frutos do Mar/microbiologia , Actinobacteria/genética , Actinobacteria/isolamento & purificação , África Ocidental , Animais , Técnicas de Tipagem Bacteriana , Benin , Chloroflexi/genética , Chloroflexi/isolamento & purificação , Firmicutes/genética , Firmicutes/isolamento & purificação , Dados de Sequência Molecular , Proteobactérias/genética , Proteobactérias/isolamento & purificação , RNA Ribossômico 16S , Águas Salinas , Microbiologia do Solo , Microbiologia da Água
9.
Int J Food Microbiol ; 210: 121-30, 2015 Oct 01.
Artigo em Inglês | MEDLINE | ID: mdl-26119189

RESUMO

The spoilage activity of Pseudomonas psychrophila and Carnobacterium maltaromaticum, two tropical shrimp (Penaeus notialis) spoilage organisms, was assessed in cooked shrimps stored at 0 to 28 °C. Microbiological, chemical and sensory analyses were performed during storage. P. psychrophila had a higher growth rate and showed a higher spoilage activity at temperatures from 0 to 15 °C, while at 28 °C, C. maltaromaticum had a higher growth rate. The spoilage activity of P. psychrophila was found to be higher in cooked shrimp than in fresh shrimp. Observed shelf-life data of shrimps stored at constant temperatures were used to validate a previously developed model that predicts tropical shrimp shelf-life at constant storage temperatures. Models predicting the growth of the spoilage organisms as a function of temperature were constructed. The validation of these models under dynamic storage temperatures simulating temperature fluctuation in the shrimp supply chain showed that they can be used to predict the shelf-life of cooked and fresh tropical shrimps.


Assuntos
Carnobacterium/fisiologia , Manipulação de Alimentos/normas , Microbiologia de Alimentos/métodos , Modelos Teóricos , Penaeidae/microbiologia , Pseudomonas/fisiologia , Frutos do Mar , Temperatura , Animais , Culinária , Pseudomonas/crescimento & desenvolvimento , Frutos do Mar/microbiologia , Frutos do Mar/normas
10.
Int J Food Microbiol ; 205: 81-9, 2015 Jul 16.
Artigo em Inglês | MEDLINE | ID: mdl-25910031

RESUMO

Phytate is known as a strong chelate of minerals causing their reduced uptake by the human intestine. Ninety-three yeast isolates from traditional African fermented food products, belonging to nine species (Pichia kudriavzevii, Saccharomyces cerevisiae, Clavispora lusitaniae, Kluyveromyces marxianus, Millerozyma farinosa, Candida glabrata, Wickerhamomyces anomalus, Hanseniaspora guilliermondii and Debaryomyces nepalensis) were screened for phytase production on solid and liquid media. 95% were able to grow in the presence of phytate as sole phosphate source, P. kudriavzevii being the best growing species. A phytase coding gene of P. kudriavzevii (PHYPk) was identified and its expression was studied during growth by RT-qPCR. The expression level of PHYPk was significantly higher in phytate-medium, compared to phosphate-medium. In phytate-medium expression was seen in the lag phase. Significant differences in gene expression were detected among the strains as well as between the media. A correlation was found between the PHYPk expression and phytase extracellular activity.


Assuntos
6-Fitase/genética , 6-Fitase/metabolismo , Microbiologia de Alimentos , Pichia/enzimologia , Pichia/genética , Leveduras/enzimologia , Leveduras/genética , Regulação Fúngica da Expressão Gênica , Fosfatos/metabolismo , Ácido Fítico/metabolismo , Reação em Cadeia da Polimerase em Tempo Real , Leveduras/isolamento & purificação
11.
Food Microbiol ; 48: 8-16, 2015 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-25790985

RESUMO

Maintaining the freshness of shrimp is a concern to shrimp stakeholders. To improve shrimp quality management, it is of importance to evaluate shrimp spoilage characteristics. Therefore, microbiological, sensory, and chemical changes of naturally contaminated tropical brackish water shrimp (Penaeus notialis) during storage at 28 °C, 7 °C and 0 °C were assessed. H2S-producing bacteria were the dominant group of microorganisms at 28 °C and 7 °C whereas Pseudomonas spp. were dominant at 0 °C. Total volatile basic nitrogen and trimethylamine correlated well (R(2) > 0.90) with the sensory scores. An empirical model to predict the shelf-life of naturally contaminated tropical shrimp as a function of storage temperature was developed. Specific groups of organisms were isolated at the sensory rejection times and assessed for spoilage potential in shrimps of which the endogenous flora was heat inactivated. Isolates capable of producing strong off-odor identified by 16S rRNA sequencing were mainly lactic acid bacteria (LAB) and Enterobacteriaceae at 28 °C or 7 °C and Pseudomonas spp. and LAB at 0 °C. The study contributes to the knowledge about tropical shrimp spoilage and provides a basis for the development of methods and tools to improve shrimp quality management.


Assuntos
Bactérias/isolamento & purificação , Armazenamento de Alimentos/métodos , Penaeidae/microbiologia , Frutos do Mar/microbiologia , Animais , Bactérias/classificação , Bactérias/genética , Bactérias/metabolismo , Humanos , Metilaminas/análise , Metilaminas/metabolismo , Nitrogênio/análise , Nitrogênio/metabolismo , Odorantes/análise , Paladar , Temperatura
12.
J Sci Food Agric ; 95(15): 3137-43, 2015 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-25523343

RESUMO

BACKGROUND: Pentadesma butyracea is a tropical plant species. Its kernels are rich in edible butter similar to shea butter. This study evaluated the quality characteristics of the Pentadesma butter produced by cottage enterprises in Benin, using a quantitative survey approach and physicochemical and sensorial analysis methods. RESULTS: The butter of Pentadesma is mostly used for food preparation, cosmetic and therapeutic applications. It is characterized by a yellow colour, a hard texture, a relatively sweet taste and a bright appearance. Consumers preferred Pentadesma butter to shea butter for colour, taste, texture and appearance. Instrumental analysis showed that the average water content (6.5 g kg(-1) ) and peroxide value (0.74 mEq O2 kg(-1) ) of Pentadesma butter were lower than those of shea butter, for which average water content and peroxide values were 20.7g kg(-1) and 2.09 mEq O2 kg(-1) respectively. The fatty acid profile of Pentadesma butter is similar to that of shea butter. CONCLUSION: This study showed that the Pentadesma butyracea butter produced by cottage enterprises in Benin exhibited quality characteristics which are better than that of shea butter. The data generated can be used for a better exploitation of the butter in food and cosmetic industries.


Assuntos
Clusiaceae/química , Comportamento do Consumidor , Cosméticos , Dieta , Ácidos Graxos/análise , Preparações de Plantas , Sapotaceae/química , Benin , Cor , Dureza , Humanos , Peróxidos/análise , Sementes/química , Paladar , Água/análise
13.
J Food Prot ; 77(9): 1642-8, 2014 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-25198861

RESUMO

In recent years, the Beninese shrimp sector has faced a ban on export to the European Union due to lack of compliance with food safety standards. The present study aimed at obtaining insight into the factors that determine shrimp quality and safety in Benin. A survey was conducted to investigate the relationships between stakeholders, the conditions under which shrimps are handled at fishing areas and processed at shrimp plants, and the stakeholders' perceptions of quality. A total of 325 fishermen, 128 intermediate traders, 12 collectors, and 3 shrimp processing plant managers were interviewed face to face. The results showed that various specific relations existed between the stakeholders. For example, loyalty was ensured by family relationships, or incentives were provided to ensure a supply of shrimps between stakeholders. Shrimp handling practices during the steps prior to shrimp processing at the plants were not in agreement with the requirements of the European regulations. For example, shrimps were kept at ambient temperature (28 ± 1°C) by 94.1% of fishermen and 60.9% of intermediate traders. Shrimps were also stored in inappropriate holding containers and washed with nonpotable water. Fishermen, intermediate traders, and collectors considered shrimp size and texture their priority quality attributes, whereas plant managers considered shrimp appearance (freshness) and texture their priority quality attributes. This survey demonstrated that the steps prior to shrimp processing at the plants are the critical steps for shrimp quality and safety because of temperature abuse and inappropriate hygienic conditions. There is a need to communicate and provide incentives for the stakeholders in the first part of the chain to give priority to shrimp freshness. Moreover, training in Good Fishing Practices and safe food handling practices and evaluation of compliance with the practices through monitoring will contribute to better shrimp quality and safety management.


Assuntos
Crustáceos/química , Pesqueiros , Manipulação de Alimentos , Frutos do Mar/análise , Frutos do Mar/normas , Adulto , Animais , Benin , Feminino , Humanos , Masculino , Percepção , Controle de Qualidade , Temperatura , Recursos Humanos
14.
Ecol Food Nutr ; 51(1): 22-39, 2012.
Artigo em Inglês | MEDLINE | ID: mdl-22292710

RESUMO

Leafy vegetables are sources of diet diversification and could contribute to food and nutritional security in African rural areas. However, in some places, little is known about if, how, and why leafy vegetables are consumed. Processing and preservation methods, food forms, and consumption determinants of four leafy vegetables (Sesamum radiatum, Ceratotheca sesamoïdes, Acmella uliginosa and Justicia tenella), known to contribute to the diet of rural populations in the Center and Northern parts of Benin, were investigated. Three hundred randomly selected households were investigated, using rapid appraisal and quantitative survey methods, descriptive statistics and correspondence analysis. Processing methods to prepare sauces varied depending on sociocultural groups. Cooking of fresh leaves predominated, while sun drying was the usual practice of preserving these leafy vegetables. Consumption frequencies were associated with sociocultural groups, food habits, and availability in living areas.


Assuntos
Dieta , População Rural , Verduras , Benin , Comportamento Alimentar , Humanos
15.
Ecol Food Nutr ; 50(2): 101-14, 2011.
Artigo em Inglês | MEDLINE | ID: mdl-21888591

RESUMO

Indigenous perception, processing methods, and physicochemical and microbiological characteristics of Yanyanku and Ikpiru, two additives used to produce fermented African locust bean condiments, Sonru and Iru, were evaluated. According to producers, these additives accelerate the fermentation and soften the texture of the condiments. Yanyanku is produced by spontaneous fermentation with either Hibiscus sabdariffa or Gossypium hirsutum or Adansonia digitata seeds, whereas only Hibiscus sabdariffa seeds are used for Ikpiru. Both additives, with pH values ranging between 6.2 and 10 and Bacillus spores varying between 5.5 and 8.9 Log(10) (CFU/g), could be considered as softening additives or enrichment inocula to produce condiments.


Assuntos
Bacillus/isolamento & purificação , Condimentos/microbiologia , Dieta , Fabaceae , Aditivos Alimentares , Manipulação de Alimentos/métodos , Frutas , Adansonia , África , Coleta de Dados , Fermentação , Gossypium , Hibiscus , Humanos , Concentração de Íons de Hidrogênio , Percepção , Sementes , Esporos Bacterianos/isolamento & purificação
16.
Food Microbiol ; 28(8): 1441-7, 2011 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-21925026

RESUMO

Afitin, iru and sonru are three spontaneously fermented African locust bean Benin condiments. The fermentation processes are exothermic, with temperatures mostly being above 40 °C. A total of 19 predominant Bacillus cereus isolates from afitin, iru and sonru, were investigated. The enterotoxin genes nhe (A, B, C) were present in all 19 isolates, the hbl (A, C, D) in one (afitin), and the cytK gene in three isolates (afitin). Levels of cytotoxicity to Vero cells and NheA production in BHI-broth was within the range of known diarrheal outbreak strains. Autoclaved cooked African locust beans inoculated with emetic (cereulide producing) B. cereus Ba18H2/RIF supported growth at 25, 30 and 40 °C with highly different maximum cereulide productions of 6 ± 5, 97 ± 3 and 0.04 ± 0.02 µg/g beans, respectively (48 h). For non-autoclaved cooked beans inoculated with 2, 4 and 6 log(10)B. cereus Ba18H2/RIF spores/g beans, cereulide production was 5 ± 4, 64 ± 8 and 69 ± 34 µg/g beans, respectively at 24 h, while it was 70 ± 43, 92 ± 53 and 99 ± 31 µg/g at 48 h of fermentation at 30 °C. Even though high toxin levels were observed, to date there are no known reports on diarrhea or vomiting due to the consumption or afitin, iru and sonru in Benin, which also according to the present study is likely to be expected from the low levels of cereulide produced at 40 °C.


Assuntos
Bacillus cereus/metabolismo , Depsipeptídeos/biossíntese , Enterotoxinas/biossíntese , Fabaceae/microbiologia , Fermentação , Animais , Bacillus cereus/genética , Proteínas de Bactérias/genética , Proteínas de Bactérias/metabolismo , Chlorocebus aethiops , Qualidade de Produtos para o Consumidor , Depsipeptídeos/toxicidade , Enterotoxinas/toxicidade , Fabaceae/metabolismo , Contaminação de Alimentos/análise , Regulação Bacteriana da Expressão Gênica , Temperatura , Células Vero
17.
Int J Food Microbiol ; 142(1-2): 247-50, 2010 Aug 15.
Artigo em Inglês | MEDLINE | ID: mdl-20599285

RESUMO

Bacillus cereus sensu lato is often detected in spontaneously fermented African foods but is rarely identified to species level. Only some of the B. cereus group species are reported to be pathogenic to humans and identification to species level is necessary to estimate the safety of these products. In the present study, a total of 19 Bacillus cereus group spp. isolated from afitin, iru and sonru, three spontaneously fermented African locust (Parkia biglobosa) bean based condiments produced in Benin, were investigated. The strains were isolated at 6, 12, 18, 24 and 48 h fermentation time. By using phenotypic and genotypic methods all of the isolates could be identified as B. cereus sensu stricto. The isolates were grouped according to their PM13 PCR (random amplification of polymorphic DNA PCR) fingerprint and formed two major clusters, one of which contained eight strains isolated from afitin (cluster 1). Highly similar PM13 profiles were obtained for seven of the isolates, one from afitin, one from iru and five from sonru (cluster 2). Four of the isolates, one from afitin and three from sonru, did not form any particular cluster. The PM13 profiles of cluster 2 isolates were identical to those which are specific to emetic toxin producers. Cereulide production of these isolates was confirmed by liquid chromatography mass spectrometry/mass spectrometry. This is the first report on cereulide producing B. cereus in African fermented foods. Occurrence of the opportunistic human pathogen B. cereus, which is able to produce emetic toxin in afitin, iru and sonru, could impose a health hazard. Interestingly, no reports on food poisoning from the consumption of the fermented condiments exist.


Assuntos
Bacillus cereus/genética , Bacillus cereus/metabolismo , Condimentos/microbiologia , Depsipeptídeos/metabolismo , Fermentação , Variação Genética , Bacillus cereus/classificação , Bacillus cereus/isolamento & purificação , Condimentos/análise , Dados de Sequência Molecular , Filogenia
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA
...