乳酸菌降解亚硝酸盐机理的研究

The Study on Mechanism of Nitrite Degradation by Lactic Acid Bacteria

对乳酸菌降解亚硝酸盐机理进行了研究。其机理为 :乳酸菌对亚硝酸盐的降解分为酶降解和酸降解 2个阶段。在发酵的前期 ,培养液 pH值 >4 5时 ,乳酸菌对亚硝酸盐降解以酶降解为主 ;发酵后期 ,由于乳酸菌本身产生酸 ,使培养液 pH值降低 ,<4 0后 ,亚硝酸盐的降解主要以酸降解为主。由于乳酸杆菌产酸能力强于球菌 ,乳酸杆菌降解亚硝酸盐能力大于乳酸球菌 ,而在发酵前期 (pH值 >4 5 ) ,杆菌与球菌降解亚硝酸盐并无差别。

The mechanism on nitrite degradation by lactic acid bacteria was studied and established. The degradation course was divided into enzymolysis and acid splitting:in the early fermentation process,fermentation soup's pH>4.5,enzymolysis was the main controller,then when the pH<4.0 with the amount of acid was increasing,acid splitting became the controller,the nitrite degradation ability of lactobacillus was stronger than lactococcus because of it's acid producing ability.