Abstract: The standard diluent formula of the konjac dietary fiber microbial project was optimized to reduce the viscosity after dilution, improve the fluidity of the sample diluent, increase the uniformity of the sample dilution, ensure the accuracy of the test results. The applicability of the improved diluent was studied through comparative experiments. the diluent consisting of glycerol at the concentration of 30%~40% and NaCl at the concentration of 0.85% had the best effect, and the time of maintaining good fluidity of the diluent could meet the needs of the experiment. The diluent formula had a good applicability in the detection of related items.

Key words: glycerin, konjac dietary fiber solid drinks, microorganism, selection of diluent, applicability