کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8843539 1616228 2018 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Investigating on the fermentation behavior of six lactic acid bacteria strains in barley malt wort reveals limitation in key amino acids and buffer capacity
ترجمه فارسی عنوان
بررسی رفتار تخمیر شش سوسک باکتری های اسید لاکتیک در ذرت جو غلات، محدودیت اسید آمینه های اساسی و ظرفیت بافر را نشان می دهد
کلمات کلیدی
آمینو اسید، ظرفیت بافری، نوشیدنی های برنجی، نرخ مرگ، تخمیر مالولاتیک، زنده گی،
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک دانش تغذیه
چکیده انگلیسی
Understanding lactic acid bacteria (LAB) fermentation behavior in malt wort is a milestone towards flavor improvement of lactic acid fermented malt beverages. Therefore, this study aims to outline deficiencies that may exist in malt wort fermentation. First, based on six LAB strains, cell viability and vitality were evaluated. Second, sugars, organic acids, amino acids, pH value and buffering capacity (BC) were monitored. Finally, the implication of key amino acids, fructose and wort BC on LAB growth was determined. Short growth phase coupled with prompt cell death and a decrease in metabolic activity was observed. Low wort BC caused rapid pH drop with lactic acid accumulation, which conversely increased the BC leading to less pH change at late-stage fermentation. Lactic acid content (≤3.9 g/L) was higher than the reported inhibitory concentration (1.8 g/L). Furthermore, sugars were still available but fructose and key amino acids lysine, arginine and glutamic acid were considerably exhausted (≤98%). Wort supplementations improved cell growth and viability leading to conclude that key amino acid depletion coupled with low BC limits LAB growth in malt wort. Then, a further increase in organic acid reduces LAB viability. This knowledge opens doors for LAB fermentation process optimization in malt wort.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Food Microbiology - Volume 73, August 2018, Pages 245-253
نویسندگان
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