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首页> 外文期刊>Biotechnology Progress >Beneficial Effect of Protracted Sterilization of Lentils on Phytase Production by Aspergillus ficuum in Solid State Fermentation
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Beneficial Effect of Protracted Sterilization of Lentils on Phytase Production by Aspergillus ficuum in Solid State Fermentation

机译：小扁豆长期灭菌对固态发酵中曲霉产生植酸酶的有益作用

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摘要

Water addition to the solid substrate preceding autoclaving increased substrate porosity and phytase production in solid state fermentation. In comparison with dry sterilization, the phytase activity increased 6-, 8.5-, and 10-fold when the autoclaving time was 20, 40, and 60 min, respectively. Autoclaving increased the void space of sterilized lentils, and the increase was 16% higher when water was supplemented to the lentils before sterilization. Image analysis of SEM pictures of the solid substrate showed that water supplementation presterilization portended greater micro-fissure surface area, which also increased with increasing the sterilization time. SEM pictures of the fermentation product showed that fungal growth into the center of the solid substrate was ubiquitous when water was supplemented before sterilization but was absent when water was supplemented post sterilization. Similarly, spore formation on the substrate surface for the presterilization water supplementation samples far exceeded spore formation for samples that received supplementation post-sterilization. This evidence suggests that improved mass transfer into the solid substrate resulting from additional pore volume and the formation of micro-fissures on the substrate surface is responsible for the observed gains in phytase productivity in solid state fermentation.
机译：在高压灭菌之前，将水添加到固体底物中会增加固态发酵中的底物孔隙率和植酸酶的产生。与干式灭菌相比，当高压灭菌时间分别为20、40和60分钟时，植酸酶活性分别提高了6倍，8.5倍和10倍。高压灭菌器增加了无菌小扁豆的空隙空间，当在灭菌前向扁豆中补充水时，该增加量高出16％。固体基质的SEM图像的图像分析表明，补水预灭菌具有更大的微裂纹表面积，并且随着灭菌时间的增加而增加。发酵产物的SEM照片显示，当在灭菌前添加水时，真菌向固体基质中心的生长普遍存在，而在灭菌后添加水时则无真菌生长。类似地，预灭菌水补充样品在底物表面上的孢子形成远远超过灭菌后接受补充的样品的孢子形成。该证据表明，由于额外的孔体积和在基质表面上形成的微裂缝而导致的向固体基质的质量转移得以改善，这是固态发酵中所观察到的植酸酶生产率提高的原因。

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