Chen Xiaoju, Chen Minmin, Wu Xuefeng, Li Xingjiang
College of Chemistry and Material Engineering Chaohu University Chaohu China.
Key Laboratory for Agricultural Products Processing of Anhui Province School of Food and Biological Engineering Hefei University of Technology Hefei China.
Food Sci Nutr. 2021 Aug 4;9(10):5415-5427. doi: 10.1002/fsn3.2496. eCollection 2021 Oct.
Potato pomace, generated from starch-processing industry, was applied as a cost-effective resource for producing pigments via submerged fermentation. First, the pigment-production capacity of potato pomace and its hydrolysate was compared. The results indicated that potato pomace was superior to its hydrolysate when used for producing pigments. The red and yellow pigments produced in potato pomace medium reached 27.8 and 19.7 OD units/ml in 7 days, with the yield of total pigments at 1,187.5 OD units/g, respectively, increased by 127.9%, 19.4%, and 46.3% compared with the data obtained from hydrolysate. Meanwhile, the citrinin produced in potato pomace medium decreased by 22.6%. Afterward, potato pomace, without hydrolysis, was used as carbon source to obtain the optimal pigment production conditions. In the batch fermentation process, it was found that high amount of pomace inhibited the growth rate of mycelia and the productivity of pigments, and the fed-batch fermentation process could enhance the yield and productivity of pigments. With the same final amount of pomace (80 g/L), the maximal levels of total pigments and productivity obtained from fed-batch process reached 118.8 OD units/ml and 13.2 OD units/(ml·day), which presented an increase of 35.2% and 67.1% compared with the not fed-batch group, respectively. The results demonstrated that potato pomace was a cost-effective substrate for producing pigments in terms of pigment production capacity and productivity when fed-batch submerged fermentation was applied.
来自淀粉加工业的马铃薯渣被用作通过深层发酵生产色素的一种经济高效的资源。首先，比较了马铃薯渣及其水解产物的色素生产能力。结果表明，用于生产色素时马铃薯渣优于其水解产物。马铃薯渣培养基中产生的红色和黄色色素在7天内分别达到27.8和19.7 OD单位/毫升，总色素产量为1187.5 OD单位/克，与水解产物的数据相比分别提高了127.9%、19.4%和46.3%。同时，马铃薯渣培养基中产生的桔霉素减少了22.6%。随后，未经水解的马铃薯渣被用作碳源以获得最佳色素生产条件。在分批发酵过程中，发现大量的马铃薯渣会抑制菌丝体的生长速率和色素的生产率，而补料分批发酵过程可以提高色素的产量和生产率。在马铃薯渣最终量相同（80克/升）的情况下，补料分批发酵过程获得的总色素最大水平和生产率分别达到118.8 OD单位/毫升和13.2 OD单位/（毫升·天），与非补料分批发酵组相比分别提高了35.2%和67.1%。结果表明，当采用补料分批深层发酵时，就色素生产能力和生产率而言，马铃薯渣是一种生产色素的经济高效的底物。
