Growth Inhibitory Effect of Shelf Life Extending Agents on Bacillus subtilis IAM 1026

Abstract

Natural shelf life extending agents and sugar fatty acid esters that might inhibit the growth of B. subtilis IAM 1026 were screened, and the effective agents were as follows: β-thujaplicin (Hinokitiol) and chitosan, inhibited the growth of IAM 1026 at a concentration of 0.001% ; ε-polylysine and M-1695 (a sugar fatty acid ester) at 0.005%; citrus seed extract, thiamin lauryl sulfate, and grapefruit seed extract at 0.01%; CT-1695 and L-1695 (sugar fatty acid esters) at 0.05%; pectin digests and SM-800 (a sugar fatty acid ester) at 0.5%; water pepper seed extract and the sugar fatty acid esters SM-1000 and CE-1695 at 1.0%. The growth inhibitory effects of the agents in custard cream were not necessarily similar to those in liquid culture. The agent that showed the highest inhibitory effect in custard cream was 0.3% β-thujaplicin, followed by 0.3% ε-polylysine.