用蒸馏水法保藏产葡萄糖氧化酶毕赤酵母的研究

以斜面保藏法为对照,考察了蒸馏水保藏法对产葡萄糖氧化酶毕赤酵母基因工程菌产酶和菌体存活率的影响。采用蒸馏水法和斜面法保藏菌种Pichia pastoris P51 180d后:菌体存活率分别为90%和45%,蒸馏水法保藏效果远高于斜面保藏法;摇瓶发酵实验最终产酶活力分别是(22.5±0.5)U/m L和(23±0.4)U/m L,蒸馏水法对毕赤酵母基因工程菌产酶没有影响。另外蒸馏水法保藏毕赤酵母可在室温下进行、操作简便,与斜面保藏法相比具有一定的优势。     

Optimization of Calvatia gigantea mycelia production from distillery wastewater

The focus of wastewater management has evolved from treatment technology into resource recovery, which enables one to minimize contaminants and to generate value‐added products. Calvatia gigantea is used not only as a source of food, but has also been used as a traditional Chinese medicine for thousands of years. In this study, the mycelial production of C. gigantea was studied under submerged fermentation conditions using non‐pretreated distilled wastewater from Chinese liquor production. The fermentation medium composition was optimized using response surface methodology involving a Box–Behnken design. Fermentation conditions were optimized using an orthogonal experimental design. The optimized medium composition was the non‐pretreated distilled wastewater of Chinese liquor supplemented with cornflour at 2.35 g/100 mL, (NH₄)₂SO₄ at 1.11 g/100 mL and CuSO₄ at 0.12 g/100 mL. The optimized fermentation conditions were a rotation speed of 150 rpm, an inoculum size of 10% (v/v), a fermentation temperature of 26 °C and a fermentation time 4.5 days. A maximum mycelial biomass yield of 2.75 g/100 mL was achieved using the optimized medium under the optimized conditions. Results from this study suggest that this is a feasible technology for the mycelial production of C. gigantea using the non‐pretreated distilled wastewater from Chinese liquor production. Copyright © 2015 The Institute of Brewing & Distilling     

Isolation and identification of a black Aspergillus strain and the effect of its novel protease on the aroma of Moutai‐flavoured liquor

Among Chinese traditional distilled liquors, Moutai‐flavoured liquor is the most famous, owing to its complicated process as it is derived from fermented sorghum coupled with the use of a Moutai‐flavoured Daqu. In this study, a novel isolate, belonging to a black Aspergillus, was obtained and identified as Aspergillus hennebergii by ITS‐5.8S rRNA sequencing analysis and conventional morphologic identification. The influences of initial pH, carbon source, nitrogen source and metal ions on the production of an A. hennebergii protease were studied. The results revealed that metal ions exerted a significant effect on enzyme production and activity. Additionally, the potential application of the protease from A. hennebergii was investigated. The enzymatic hydrolysis resulted in the identification and quantification of 42 compounds, including alcohols, aldehydes, pyrazines and esters. These volatile compounds exhibited special flavour properties. Significant differences were observed between the enzyme treatments and the control sample. Samples from the enzyme treatments led to the highest amounts of alcohols, pyrazines and aromatics. These results suggest that A. hennebergii, or its protease, may have some application values for the enhancement of the quality of Chinese liquor and for the improvement of the liquor production process. Copyright © 2014 The Institute of Brewing & Distilling     

关于DBP中和水洗最优实验条件的研究

为了除去使醋化反应生成DBP产生酸度的杂质，需要设计DBP中和水洗实验及其量优条件，道过正交实验分析得到各影响因素对该实验的影响水平，并结合单目素实验分析得到各主要因素对实验影响的规律，量后综合各影响因素，得到了DBP中和水洗实验条件的量优条件为：丁醇浓度（wt％）：3％；丁醚浓度（wt％）：15％；NaOH（wt%）：2．5％。     

从钽铌矿萃取残液中回收氟钛酸钾

对含钛高的钽铌矿的萃取残液回收钛的工艺进行了研究。结果表明：以含钛萃取残液为原料，经气态HF调酸、KCl转化、冷却结晶、离心过滤、洗涤过滤、烘干后可制得工业用K2TiF6产品。该工艺简单，既减少了环境污染，又有较好的经济效益。     

芳烃抽余油生产高辛烷值异构化汽油的技术方案

中国石化石油化工科学研究院开发了一种超强酸C_5,C_6烷烃异构化RISO-C催化剂,并提出了一种生产清洁、优质的高辛烷值异构化汽油的技术方案。该方案以芳烃抽余油为原料,采用脱异己烷塔(DIH)+异构化反应的工艺流程,DIH塔顶、侧线和塔底分别得到异构化汽油产品、异构化反应原料和C_7以上组分,最终可以得到辛烷值RON大于86的C_5,C_6异构化汽油产品。     

用脉冲筛板柱净化萃余液中的TBP

在湿法冶金中采用液一液萃取时，萃余水相不可避免地会夹带（或溶解）有机萃取剂，这将给后续工艺带来严重的困难或者污染环境。本文报道了在脉冲筛板柱中，以煤油为洗涤剂可以将萃余水相中的残存有机萃取剂ＴＢＰ降低至小于５６ｒｎｇ／Ｌｏ表明该方法不仅可以用于湿法冶金，还可能用于处理含有机物的废水，以净化环境。     

Effect of doping pretreated corn stover conditions on yield of bioethanol in immobilized cell systems

The surface characteristics of immobilized yeast before and after adding CO₂-laser pretreated corn stover (LPCS) substrates were investigated using bioethanol production. Response surface methodology (RSM), based on the Box–Behnken design (BBD) for experiments, was used to optimize the doping condition. An optimum experimental condition was obtained at pH 4.5, 2.08% yeast concentration, and 0.20% LPCS substrates. Under this condition, doping LPCS increased the yield of bioethanol from 53% to 84%, which matched the predicted value. After doping LPCS, the results of inverted microscope (IM) and atomic force microscopy (AFM) illustrated that the immobilized gel beads changed from rod-like in shape with a smooth surface to a larger rod-like ultrastructure with a rougher surface. The yield was relatively stable within 28 d, with a downward trend subsequently appearing.