Doan Chien Thang, Tran Thi Ngoc, Wang Chuan-Lu, Wang San-Lang
Department of Natural Science and Technology, Tay Nguyen University, Buon Ma Thuot 630000, Vietnam.
Department of Chemistry, Tamkang University, New Taipei City 25137, Taiwan.
Polymers (Basel). 2020 Sep 28;12(10):2228. doi: 10.3390/polym12102228.
As a green and effective technique in the production of a large number of valuable products, the microbial conversion of chitinous fishery wastes is receiving much attention. In this study, protease production using the TKU032 strain was conducted on culture media containing several common types of chitinous fishery by-products serving as the carbon and nitrogen (C/N) nutrition source. Among the chitinous wastes, 1.5% (w/v) shrimp head powder (SHP) was found to be the most appropriate nutritional source for protease production when a maximal enzyme activity of 3.14 ± 0.1 U/mL was observed on the 3rd day of the culture period. The molecular mass of TKU032 protease was estimated to be nearly 32 kDa by the polyacrylamide gel electrophoresis method. The residual SHP obtained from the culture medium was also considered to be utilized for chitin extraction. The deproteinization rate of the fermentation was estimated to be 45%, and the chitin obtained from fermented SHP (fSHP) displayed a similar characteristic Fourier-transform infrared spectroscopy (FTIR) profile as that from SHP. In addition, SHP, fSHP, and chitins obtained from SHP and fSHP were investigated for their adsorptive capacity of nine types of dyes, and chitin obtained from fSHP displayed a good adsorption rate on Congo Red and Red No. 7, at 99% and 97%, respectively. In short, the results provide potential support for the utilization of SHP in the production of TKU032 protease via the fermentation as well as the preparation of chitin from fSHP as an effective dye adsorbent.
作为一种生产大量有价值产品的绿色有效技术,含几丁质的渔业废弃物的微生物转化正受到广泛关注。在本研究中,使用TKU032菌株在含有几种常见类型的含几丁质渔业副产物作为碳氮(C/N)营养源的培养基上进行蛋白酶生产。在含几丁质的废弃物中,发现1.5%(w/v)的虾头粉(SHP)是蛋白酶生产最合适的营养源,在培养期第3天观察到最大酶活性为3.14±0.1 U/mL。通过聚丙烯酰胺凝胶电泳法估计TKU032蛋白酶的分子量约为32 kDa。从培养基中获得的残余SHP也被认为可用于几丁质提取。发酵的脱蛋白率估计为45%,从发酵虾头粉(fSHP)获得的几丁质显示出与SHP相似的傅里叶变换红外光谱(FTIR)特征谱。此外,研究了SHP、fSHP以及从SHP和fSHP获得的几丁质对九种染料的吸附能力,从fSHP获得的几丁质对刚果红和7号红的吸附率分别为99%和97%,表现出良好的吸附效果。简而言之,这些结果为通过发酵利用SHP生产TKU032蛋白酶以及从fSHP制备几丁质作为有效染料吸附剂提供了潜在支持。