An approach on microbial biosynthesis of L-glutaminase: a tumour inhibitor.

L-Glutaminase, an amidohydrolase enzyme has been a choice of interest in the treatment of lymphoblastic leukemia. This study investigates the production of extracellular L-glutaminase synthesis were carried out by using Aspergillus oryzae was evaluated under different fermentation parameters by employing submerged fermentation method. The L-glutaminase producers detected by the pink zone around the colony by simple plate assay method. Aspergillus oryzae S2 is the potential strain among the fungal isolates. The L-glutaminase synthesis were increased their yield after the optimization of fermentation parameters. The optimum pH 5.0, temperature 350C and inoculum size 1.0 ml and it showed 217.65 IU.

Alterations in rat intestinal sucrase and alkaline phosphatase activities in alloxan induced experimental diabetes.

Rat intestines revealed a significant loss of proteins after seven days of alloxan induced diabetes. The data suggested the presence of two forms of alkaline phosphatase (ALP) in normal rat intestines. Along with the loss of proteins from the intestines during diabetes, a form of ALP which appears to be loosely bound to the intestine is also flushed out. Total brush border membrane (BBM) proteins are relatively preserved from such leaching effect of alloxan induced diabetes. Thus, sucrase and another form of ALP which appears to be strongly bound to the BBM are flushed out at a slower rate as compared to the other intestinal proteins and loosely bound soluble ALP. BBM preparations from diabetic rat intestines showed lower ratios for BBM/intestinal homogenate sucrase or ALP activity/mg proteins as compared to the normal control rats. Such ratios, therefore, misdepict the purity as low for the BBM from diabetic rats which is merely because of the decreased contents of proteins in the intestinal homogenate during alloxan-induced acute experimental diabetes.

Lipid composition of intestinal brush border membrane in alloxan induced acute experimental diabetes.

Several alterations were observed in the rat intestinal brush border membrane (BBM) lipid composition after 7 days old alloxane-induced diabetes as compared to the control animals. There was no change in the total protein contents but a significant increase in the total lipid contents was observed. Glycolipids constituting the major lipid components showed a two-fold increase. No significant difference was observed in the total phospholipid contents. A significant decline in the free cholesterol (CH) level, free fatty acids, triglycerides and sialic acid contents was observed in membranes from diabetic rats. Esterified CH, monoglycerides+diglycerides, phosphatidyl serine+phosphatidyl inositol and phosphatidyl choline levels remained unaffected. A significant increase in sphingomyelin with a parallel decrease in phosphatidyl ethanolamine was observed in BBM preparations from diabetic rats. The observed changes in intestinal BBM might be responsible for altered functions of the diabetic intestines.