Jujube wine is a health drink with local characteristics and is worth pro- moting. Jujube wine fermentation can be divided into alcoholic fermentation and mal- olactic fermentation. Yeast is the key of alcoholic ferme...Jujube wine is a health drink with local characteristics and is worth pro- moting. Jujube wine fermentation can be divided into alcoholic fermentation and mal- olactic fermentation. Yeast is the key of alcoholic fermentation while lactic acid bac- teria is the key of malolactic fermentation, and therefore the breeding of yeast and lactic acid bacteria is crucial for the quality of jujube wine. Besides, the control of methanol is a major problem in production, and the control of higher alcohol is also difficult. Thus, we summarized the research related with the breeding of yeast and lactic acid bacteria, and the control of methanol and higher alcohols, and proposed that breeding specialized yeast and lactic acid bacteria was the future research di- rection. Moreover, the production mechanism of methanol and higher alcohols was investigated, and the content of methanol and higher alcohols was effectively con- trolled on the basis of quality guarantee, providing references for the production technology of jujube wine.展开更多
A series of bifunctional catalysts composed of a component for higher alcohol synthesis （Cu-CoMn oxides, CCM） and an acidic zeolite （SAPO-34, ZSM-5, Y, MCM-41） were prepared for production of liquid hydrocarbon di...A series of bifunctional catalysts composed of a component for higher alcohol synthesis （Cu-CoMn oxides, CCM） and an acidic zeolite （SAPO-34, ZSM-5, Y, MCM-41） were prepared for production of liquid hydrocarbon directly from a bio-syngas through a one-stage pro-cess. The effects of zeolite type, zeolite content, Si/Al ratio and preparation method on catalyst texture and its reaction performance were investigated. Higher selectivities and yields of liquid products were obtained by using bifunctional catalysts. The yields of liquid hydrocarbons decreased in the order CCM-ZSM-5〉CCM-SAPO-34〉CCM-Y〉CCM-MCM-41. CCM-ZSM-5 （20wt%, Si/Al=100） prepared by coprecipitation method displayed the optimal catalytic performance with the highest CO conversion （76%） and yield of liquid products （30%）. The catalysts were characterized by N2 adsorption/desorption, NH3-TPD, XRD, and H2-TPR analysis. The results showed that higher speci c surface areas and pore volumes of bifunctional catalysts were achieved by adding zeolites into CuCoMn precursors. Medium pore dimension and moderate acidity in CCM-ZSM-5 were observed, which proba-bly resulted in its excellent reaction performance. Additionally, a higher number of weaker acid sites （weak and/or medium acid sites） were formed by increasing ZSM-5 content in CCM-ZSM-5 or decreasing Si/Al ratio in ZSM-5. It was also seen that metal dispersion was higher and reducibility of metal ions was easier on the CCM-ZSM-5 catalyst prepared by coprecipitation. The higher alcohols-to-hydrocarbon process provides a promising route to hydrocarbon fuels via higher alcohols from syngas or biobased feedstocks.展开更多
Ahn To establish an RP-HPLC method for determination of content of 1-phenylpropanol in its raw material and preparations. Methods Chromatography was carried out on a Dikma DiamonsilTM ODS column, using a mobile phase ...Ahn To establish an RP-HPLC method for determination of content of 1-phenylpropanol in its raw material and preparations. Methods Chromatography was carried out on a Dikma DiamonsilTM ODS column, using a mobile phase of methanol-water （55：45） with a flow rate at 1.0 mL·min^-1. The detection wavelength was 258 nm. Results Under the chromatographic condition, the peaks of 1-phenylpropanol and its related impurities separated completely; noninterference between the principal agent and adjuvants in preparations was performed. The calibration curve was linear over the range of 250 - 750μg·mL^-1 with the correlation coefficient of 0. 999 9. The average recovery was 100.2% （ RSD = 1.35% ）. Conclusion This method is simple, rapid, accurate, specific, and can be used to detect the content and related compounds of phenylpropanol in its raw material and preparations.展开更多
A series of surfactant-modified CuCoMn-based catalysts were prepared for higher alco- hol synthesis from biomass-based syngas. Three typical surfactants, cetyltrimethylammonium bromide （CTAB）, sodium dodecyl sulfate...A series of surfactant-modified CuCoMn-based catalysts were prepared for higher alco- hol synthesis from biomass-based syngas. Three typical surfactants, cetyltrimethylammonium bromide （CTAB）, sodium dodecyl sulfate （SDS） and pluronic P123 triblock copolymer （EO20PO70EO20）, were employed. Compared to surfactant-free CuCoMn catalyst, CO conversion increased from 17.4% to 29.7% over SDS-modified CuCoMn catalyst, and the selectivity of higher alcohols increased from 22.0% to 41.2% over CTAB-modified catalyst. Besides, the proportions of higher alcohols in total alcohols increased over all surfactantmodified catalysts. The catalysts were characterized by N2 adsorption/desorption, XRD, XPS and IR analysis. The results showed that several more favorable features rendered the CTAB-modified CuCoMn catalyst to be suitable for higher alcohol production, such as the larger pore size, better crystallinity of CuCoMnO4 spinel. moderate surface atomic distribution and lower valence of metallic ions. In addition, it was verified that CTAB addition at the metal precipitation stage was beneficial to higher alcohol synthesis. Surfactant-induced modification provides a promising alternative method for catalyst improvement in synthesis of higher alcohols.展开更多
Aim To establish reliable methods for evaluating the quality of rhizoma of Polygonum cuspidatum( Huzhang in Chinese). Methods TLC and HPLC were employed for the chemical identification and content determination,respec...Aim To establish reliable methods for evaluating the quality of rhizoma of Polygonum cuspidatum( Huzhang in Chinese). Methods TLC and HPLC were employed for the chemical identification and content determination,respectively. Results A qualitative TLC method and a quantitative HPLC method with piceid as the reference substance were established, respectively. With piceid as the reference substance and ethyl acetate-methanol-formic acid-water ( 19:3:0.5:1) as the mobile phase, a TLC method for the identification of Huzhang from the commonly used crude drugs of the same family was also set up. Conclusion The established TLC method can reasonably appraise the quality of the drug and easily distinguish Huzhang from the other commonly used crude drugs of the same family. The HPLC method for determining piceid is simple, reproducible, accurate, and feasible.展开更多
基金supported by the National Natural Science Foundation of China (50772107)National Key Basic Research Program of China (973)(2007CB210206)National High-Tech Research and Development Program of China (863) (2009AA05Z435)~~
基金Supported by the"Program for the Study on the Processing and Utilization of Regional Feature Fruits in Shanxi(2017)",the Shanxi Finance Department(2017zzcx-01)the Program for the Evaluation of Jujube Varieties and the Processed Goods Nutritional Value,and the Development of Processing Techniques,a subproject of the"Development of Key Technologies for the Commercialization of Red Jujube",the Shanxi Science and Technology Department(2015-TN-4-7)~~
文摘Jujube wine is a health drink with local characteristics and is worth pro- moting. Jujube wine fermentation can be divided into alcoholic fermentation and mal- olactic fermentation. Yeast is the key of alcoholic fermentation while lactic acid bac- teria is the key of malolactic fermentation, and therefore the breeding of yeast and lactic acid bacteria is crucial for the quality of jujube wine. Besides, the control of methanol is a major problem in production, and the control of higher alcohol is also difficult. Thus, we summarized the research related with the breeding of yeast and lactic acid bacteria, and the control of methanol and higher alcohols, and proposed that breeding specialized yeast and lactic acid bacteria was the future research di- rection. Moreover, the production mechanism of methanol and higher alcohols was investigated, and the content of methanol and higher alcohols was effectively con- trolled on the basis of quality guarantee, providing references for the production technology of jujube wine.
文摘A series of bifunctional catalysts composed of a component for higher alcohol synthesis （Cu-CoMn oxides, CCM） and an acidic zeolite （SAPO-34, ZSM-5, Y, MCM-41） were prepared for production of liquid hydrocarbon directly from a bio-syngas through a one-stage pro-cess. The effects of zeolite type, zeolite content, Si/Al ratio and preparation method on catalyst texture and its reaction performance were investigated. Higher selectivities and yields of liquid products were obtained by using bifunctional catalysts. The yields of liquid hydrocarbons decreased in the order CCM-ZSM-5〉CCM-SAPO-34〉CCM-Y〉CCM-MCM-41. CCM-ZSM-5 （20wt%, Si/Al=100） prepared by coprecipitation method displayed the optimal catalytic performance with the highest CO conversion （76%） and yield of liquid products （30%）. The catalysts were characterized by N2 adsorption/desorption, NH3-TPD, XRD, and H2-TPR analysis. The results showed that higher speci c surface areas and pore volumes of bifunctional catalysts were achieved by adding zeolites into CuCoMn precursors. Medium pore dimension and moderate acidity in CCM-ZSM-5 were observed, which proba-bly resulted in its excellent reaction performance. Additionally, a higher number of weaker acid sites （weak and/or medium acid sites） were formed by increasing ZSM-5 content in CCM-ZSM-5 or decreasing Si/Al ratio in ZSM-5. It was also seen that metal dispersion was higher and reducibility of metal ions was easier on the CCM-ZSM-5 catalyst prepared by coprecipitation. The higher alcohols-to-hydrocarbon process provides a promising route to hydrocarbon fuels via higher alcohols from syngas or biobased feedstocks.
文摘Ahn To establish an RP-HPLC method for determination of content of 1-phenylpropanol in its raw material and preparations. Methods Chromatography was carried out on a Dikma DiamonsilTM ODS column, using a mobile phase of methanol-water （55：45） with a flow rate at 1.0 mL·min^-1. The detection wavelength was 258 nm. Results Under the chromatographic condition, the peaks of 1-phenylpropanol and its related impurities separated completely; noninterference between the principal agent and adjuvants in preparations was performed. The calibration curve was linear over the range of 250 - 750μg·mL^-1 with the correlation coefficient of 0. 999 9. The average recovery was 100.2% （ RSD = 1.35% ）. Conclusion This method is simple, rapid, accurate, specific, and can be used to detect the content and related compounds of phenylpropanol in its raw material and preparations.
基金V. ACKNOWLEDGMENTS This work was supported by the National Key Basic Program of China （No.2013CB228105）, and the National Natural Science Foundation of China （No.51161140331）. The assistance of Song-bai Qiu and Tong-qi Ye from University of Science and Technology of China is gratefully acknowledged.
文摘A series of surfactant-modified CuCoMn-based catalysts were prepared for higher alco- hol synthesis from biomass-based syngas. Three typical surfactants, cetyltrimethylammonium bromide （CTAB）, sodium dodecyl sulfate （SDS） and pluronic P123 triblock copolymer （EO20PO70EO20）, were employed. Compared to surfactant-free CuCoMn catalyst, CO conversion increased from 17.4% to 29.7% over SDS-modified CuCoMn catalyst, and the selectivity of higher alcohols increased from 22.0% to 41.2% over CTAB-modified catalyst. Besides, the proportions of higher alcohols in total alcohols increased over all surfactantmodified catalysts. The catalysts were characterized by N2 adsorption/desorption, XRD, XPS and IR analysis. The results showed that several more favorable features rendered the CTAB-modified CuCoMn catalyst to be suitable for higher alcohol production, such as the larger pore size, better crystallinity of CuCoMnO4 spinel. moderate surface atomic distribution and lower valence of metallic ions. In addition, it was verified that CTAB addition at the metal precipitation stage was beneficial to higher alcohol synthesis. Surfactant-induced modification provides a promising alternative method for catalyst improvement in synthesis of higher alcohols.
基金TheNinth Five yearNationalKeyScientificandTech nicalProgramofChinaNo.99 92 9 0 1 3 1
文摘Aim To establish reliable methods for evaluating the quality of rhizoma of Polygonum cuspidatum( Huzhang in Chinese). Methods TLC and HPLC were employed for the chemical identification and content determination,respectively. Results A qualitative TLC method and a quantitative HPLC method with piceid as the reference substance were established, respectively. With piceid as the reference substance and ethyl acetate-methanol-formic acid-water ( 19:3:0.5:1) as the mobile phase, a TLC method for the identification of Huzhang from the commonly used crude drugs of the same family was also set up. Conclusion The established TLC method can reasonably appraise the quality of the drug and easily distinguish Huzhang from the other commonly used crude drugs of the same family. The HPLC method for determining piceid is simple, reproducible, accurate, and feasible.
