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›› 2002, Vol. 2 ›› Issue (5): 0-0.

• 5 •    

六方BN微颗粒表面化学镀镍

李钒, 张登君, 李报厚, 罗世民   

  1. 中国科学院过程工程研究所，北京 100080
  • 出版日期:2002-10-20 发布日期:2002-10-20

Production of Citric Acid from Apple Pomace Enzymolyzed by Cellulase

SONG Ji-rong(宋纪蓉)，HUANG Jie(黄洁)，XU Kang-zhen(徐抗震)，ZHAO Qiao-yun(赵巧云)   

  1. College of Chemical Engineering, Shaanxi Key Laboratory of Physical–Inorganic Chemistry,Northwest University, Xi’an, Shaanxi 710069, China
  • Online:2002-10-20 Published:2002-10-20

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被引次数

44

摘要： 研究了以肼为还原剂、氨为配合剂的六方BN微颗粒表面化学镀纯镍反应新体系. 热力学计算表明，此镀镍体系是可行的. 实验发现，新的镀液体系比传统酒石酸盐镀液体系具有更好的热稳定性和化学稳定性. 镀层的XRD分析表明，不同体系镀层相结构相同. SEM观测和EDS分析显示，新体系镀层更为致密.

关键词: BN微颗粒, 化学镀镍, 氨配合体系, 结构

Abstract: Cellulase can evidently increase the content of glucose and has a significant effect on the production of citric acid from apple pomace by Aspergillus niger. Based on experiments, a cellulolytic enzyme named cellulase A6 was found able to produce about 170 g glucose from 1 kg dried apple pomace after 12 h reaction, with cellulase concentration of 20 U/g in the medium at 50oC, natural pH without pretreatment of alkali. Using the treated apple pomace as a liquid state substrate, Aspergillus niger-C selected out was able to produce about 256 g citric acid from 1 kg dried apple pomace at 35oC in 3 d or 30oC in 5 d with flask rotation speed of 210 r/min, and the conversion of citric acid could reach 80% based on the amount of sugar consumed.

Key words: citric acid, apple pomace, cellulase, fermentation

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