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The Production of Lactic Acids grom Lactobacillus acidophilus
No full textABSTRACT.The ratio of D-and L-lactic acid produced in media by 39 strains of the L. acidophilus group lactic acid bacteria (A1-A4,B1, and B2 subgroups) was analyzed by high performance liquid chromatography (HPLC). L. acidophilus (A1) and L. jhonsonii (B2) produced the lowest ( 5 strains average : 41.9%) contents of D-lactic acid in MRS broth, respectively. Generally, the most dominant lactic acid (more than 50%) produced by each strain in MRS broth was a D-type isomer, except for the A1 subgroup. In L. gasseri DSM 20243T (B1), increases in the sugar content in MRS broth induced both a high production of total lactic acids and a high ratio of D-lactic acid. In skim milk, D-lactic acid decreased by 20 30 % in 5 strain types of the L. acidophilus group except L. amylovorus JCM 1126 T (A3). By sequentially changing the medium, the content of D-lactic acid in the final MRS broth reverted to almost the same level of that in the initial MRS broth. These results indicated that the ratio of D-lactic acid produced by L. acidophilus group bacteria may be controlled by improving fermentative conditio
Isolasi, Komponen Peptida Bioaktif yang Terkandung Dalam Kasein Susu
No full textABSTRACT. The production of Casein hydrolysate with an extracellular proteinase from Lactobacillus helveticus CP790, was fractionated by two-step reverse phase heigh performance liquid chromatography. Only 1 fraction showed antihypertensive activity as measured by systolic blood pressure in spontaneously hypertensive rats after oral adsministration. Ten peptides in the fraction were further purified and identified by analisys of amino acid sequences. Each identified peptide was chemically synthesized, and the ant.ihypertensive activity of each peptide was evaluated in spontaneously hypertensive rats. The synthetic peptide with a sequence of Lys-Val-Leu-Pro-Val-Pro-Gln, found in -casein, indicated strong antihypertensive activity from 2 to 10 h after oral adsministration of 2 mg of peptide/kg of BW, and the effect was maximal at 6 h after oral adsministration. Moreover, the antihypertensive effect of the peptide was dependent on the dosage of peptide from 0.5 to 2 mg o peptide/kg of BW