Abstract
The effects of incubation time and incubation temperature on precipitation zones of peptide-lignosulphonic acid complexes in agar plates are studied in relation to the mathematical dependence of zone diameter as a function of the concentrations of lignosulphonic acids in serial 2-fold dilutions. Optimal conditions are given for obtaining regression lines with not significant second degree coefficients under defined conditions. A diffusion unit, proposed as a measure of peptide-precipitating lignosulphonic acids in aqueous solution, is defined. The possibility is discussed of using the described procedure as a micro quantitative method for the determination of peptide-precipitating lignosulphonic acids in aqueous solution.
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