CALCIUM AND VITAMIN B12 BINDING TO PROTEINS IN HUMAN SERUM AND CEREBROSPINAL FLUID

OBSERVATIONS ON VITAMIN B12 IN SERUM AND CEREBROSPINAL FLUID IN MULTIPLE SCLEROSIS

There are several claims that B(12) concentrations in serum and cerebrospinal fluid are grossly abnormal in multiple sclerosis, but results are conflicting. This paper reports measurements of these concentrations in 40 serum samples and 23 samples of lumbar cerebrospinal fluid from cases of multiple sclerosis, and in appropriate controls, using Euglena gracilis, z strain. The serum concentrations were found to be normal; the mean concentration in cerebrospinal fluid was slightly reduced, but all values were within the control range. In both control samples and samples from cases of multiple sclerosis, the B(12) concentration in lumbar cerebrospinal fluid was correlated with the concentration in serum. There was no correlation between B(12) concentration and total protein in cerebrospinal fluid.A number of estimations of serum B(12) were also made with Lactobacillus leichmannii, after extraction in the presence and absence of cyanide. These showed a difference between cases of multiple sclerosis and controls, one interpretation of which might be that the serum in multiple sclerosis contains an abnormally low concentration of hydroxocobalamin.

Microbiological determination of drug partitioning. IV. Drug-protein interactions

The protein binding characteristics of chloramphenicol, furazolium chloride, benzalkonium chloride, and phenylmercuric nitrate were described from their partitioning behavior in gelatin-acacia complex coacervate systems. Although the partitioning was determined by two different methods (microbiological and chemical), the microbiological method was more reliable for this type of investigation. Drug-protein parameters were calculated for the four antimicrobials. The advantages of the coacervate systems over other models for protein binding studies of drugs are discussed.