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Comparative studies of versatile extracellular proteolytic activities of lactic acid bacteria and their potential for extracellular amino acid productions as feed supplements

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Journal of Animal Science and Biotechnology 2019年第3期10卷 789-801页

作者： Ye Heng Lim Hooi Ling Foo Teck Chwen Loh Rosfarizan Mohamad Norhani Abdullah Institute of Bioscience Universiti Putra Malaysia43400 UPMSerdangSelangorMalaysia Department of Bioprocess Technology Faculty of Biotechnology and Biomolecular SciencesUniversiti Putra Malaysia43400 UPMSerdangSelangorMalaysia Department of Animal Sciences Faculty of AgricultureUniversiti Putra Malaysia43400 UPMSerdangSelangorMalaysia Institute of Tropical Agriculture and Food Security Universiti Putra Malaysia43400 UPMSerdangSelangorMalaysia Institute of Tropical Forestry and Forest Products Universiti Putra Malaysia43400 UPMSerdangSelangorMalaysia

Background:Increasing understanding on the functions of amino acids (AA) has led to new commercial applications and expansion of the worldwide ***,the current technologies rely heavily on non-food grade microorganism and chemical synthesis for the production of *** studies reported that lactic acid bacteria (LAB) have the capability of producing AA owing to their well-established proteolytic system and amino acid biosynthesis ***,the objectives of this study were to explore the extracellular proteolytic activity of LAB isolated from various Malaysian fermented foods and their potential to produce AA extracellularly as feed ***:All the studied LAB isolates were versatile extracellular protease producers,whereby extracellular protease activities were detected from acidic to alkaline pH (pH 5,pH 6.5,pH 8) using qualitative and quantitative proteolytic *** highest proteolytic activity at pH 5 (15.76 U/mg) and pH 8 (19.42 U/mg) was achieved by lactobacillus plantarum RG14,while lactobacillus plantarum RS5 exhibited the highest proteolytic activity of 17.22 U/mg at pH *** for the results of AA production conducted in de Man,Rogosa and Sharpe medium and analysed by high pressure liquid chromatography system,all LAB isolates were capable of producing an array of ***,Pediococcus *** greater ability for AA production as compared to lactobacillus ***,the studied LAB were able to produce a few major feed supplement AA such as methionine,lysine,threonine and *** TL-3 recorded the highest methionine and threonine productivity of 3.72 mg/L/h and 5.58 mg/L/h ***,*** I-UL4 demonstrated a lysine productivity of 1.24 mg/L/h,while *** TP-6 achieved up to 1.73 mg/L/h of tryptophan ***:All the 17 studied LAB isolates possessed versatile extracellular proteolytic system and have vast capability of producing various amino acids including a

关键词： Amino acid Bio-agent Extracel ular proteolytic activity Feed supplement Lactic acid bacteria lactobacil us Pediococcus

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