Effect of bio-heat on microbial succession and metabolism in traditional solid-state fermentation：a review

Abstract:

Revealing the influence of bio-heat generated in traditional solid-state fermentation on the microbial metabolism is the key to understanding the fermentation mechanism, regulating the fermentation process, and ensuring the fermentation efficiency. In the solid-state fermentation process, the bio-heat generated from the microbial metabolic activities and the low heat transfer efficiency of the fermentation substrate causes the increase in fermentation temperature, which affects the growth and metabolism of microorganisms. However, the effect of bio-heat on the microorganisms in traditional solid-state fermentation and the adaptation mechanism of microorganisms remain unclear. We expounded the effect of high temperature mediated by continuous bio-heat on the microbial succession and metabolism in the traditional solid-state fermentation process. Furthermore, we proposed that the complex community regulate microbial metabolism at multiple levels (community level and individual level) to adapt to the high-temperature environment. Understanding the impact of bio-heat on the microorganisms in traditional solid-state fermentation and the potential heat-resistance mechanisms will facilitate the targeted regulation of fermentation process and improve the production of high-temperature fermentation to meet the needs of industrialization.

Key words:solid-state fermentation;high-temperature stress;heat resistant mechanism;metabolic regulation