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Food Chem ; 340: 128199, 2021 Mar 15.
Artigo em Inglês | MEDLINE | ID: mdl-33027719

RESUMO

This study was the first to evaluate changes in isoflavone, amino acid, conjugated linoleic acid (CLA), antioxidant effect, and digestive enzyme inhibition during fermentation of soy-milk to soy-yogurt with L. brevis and L. plantarum. Total average isoflavones were reduced (1318.2 â†’ 971.1 µg/g) with an increase of aglycones (60.2 â†’ 804.9 µg/g, genistein > daidzein > glycitein) in soy powder yogurts (SPYs). Amino acids increased considerably, as did ornithine (average 4.1 â†’ 551.0 mg/g), and CLA showed high variations from not-detected (ND) to 0.5, 0.9 mg/g (cis-9, trans-11) and ND to 0.3, 0.2 mg/g (trans-10, cis-12). Digestive enzyme inhibitions (α-glucosidase, α-amylase, and pancreatic lipase) displayed high activities (average 50.6 â†’ 67.2, 5.2 â†’ 46.4, 10.6 â†’ 51.4%). Moreover, the antioxidant abilities against radicals were elevated as follows: ABTS > DPPH > hydroxyl (average 63.5 â†’ 86.5, 50.2 â†’ 70.3, 39.3 â†’ 55.2%). Specifically, SPY using mixed strains exhibited the greatest enzymatic inhibition and antioxidant capacities.


Assuntos
Aminoácidos/análise , Digestão , Fermentação , Glycine max/microbiologia , Isoflavonas/análise , Ácidos Linoleicos Conjugados/análise , Iogurte/análise , Antioxidantes/análise , Antioxidantes/farmacologia , Inibidores Enzimáticos/análise , Inibidores Enzimáticos/farmacologia , Isoflavonas/farmacologia , Especificidade da Espécie , Iogurte/microbiologia
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