Identification of Polyphenolic Components in Unripe Banana Pulp and Their Inhibitory Effects on α-Amylase and α-Glucosidase [PDF]
The composition of phenolics extracted from unripe banana flesh was identified using ultra-high performance liquid chromatography coupled with Q-Exactive Orbitrap mass spectrometry (UPLC-Q-Exactive Orbitrap-MS), and the inhibitory effects of banana ...
WANG Qian, WANG Juan, FU Jinfeng, SHENG Ou
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Development of Molecularly Imprinted Monolithic Column for Capillary Electrochromatography [PDF]
, 2007 从分子印迹毛细管电色谱整体柱的基本原理入手,介绍了毛细管的预处理方法;讨论了色谱柱制备过程中,印迹分子、功能单体、交联剂、引发剂、溶剂的选择以及比例的影响;比较了光引发及热引发两种聚合方式的特点;阐述了聚合时间、聚合温度的控制;并探讨了色谱分析过程中检测电压、检测温度、流动相组成等操作条件的影响。最后介绍了分子印迹毛细管电色谱整体柱领域一些新的研究方向,并对其今后的发展进行了展望。Molecularly imprinted monolithic column(MIPMC) for capillary ...
姚传义, 梁哲, 阎超
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Structural Characterization and Thermal Stability Analysis of Lignin from Flaxseed Hulls [PDF]
To understand the structural and thermal properties of lignin in flaxseed hulls, milled wood lignin (MWL), lignin-carbohydrate complex (LCC), and acid-soluble LCC (LCC-AcOH) from flaxseed hulls, obtained by ball milling pretreatment in combination with ...
XU Huiya, ZHU Xiaotian, LI Yuehua, ZHANG Shuo, CHEN Qingyu, ZHANG Hanzhe, WANG Yixuan, FANG Xu, CAI Xiaoshuang, LIU Huamin
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, 2019 以云南烟叶、烟秆为原料,以无水乙醇为溶剂,采用水热法制备生物基致香物质。对影响烟叶提取率的液料比、液化温度、液化时间、原料种类4个影响因素进行了研究。分别使用石油醚和二氯甲烷对液化物进行萃取,用气相色谱-质谱联用技术(GC-MS)对萃取成分进行分析。结果表明,反应时间的越长,热解产物中致香总物质含量越低。相同制备工艺条件下,烟叶为原料制备的致香物质总含量要高于烟秆。随着溶剂量的增加,体系中致香物质总含量随之降低。反应制备温度越高致香物质含量随之下降。云南省烟草化学重点实验室开放项目 ...
刘灿 +7 more
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取代基上官能团位置对苄基壳聚糖衍生物液晶性的影响 [PDF]
, 2009 合成了4种N-苄基化壳聚糖衍生物,即N-(2-羟基苄基)壳聚糖、N-(3-羟基苄基)壳聚糖、N-(4-羟基苄基)壳聚糖和N-(3-甲氧基-4-羟基苄基)壳聚糖(分别简写为NOCS、NMCS、NPCS和NMPCS),它们的取代基上官能团的数目和位置不同.N-取代度相近,分别为0.72,0.62,0.71和0.68.衍生物溶解在甲酸溶液中均呈现胆甾型溶致液晶相.用偏光显微镜法和折射率法测得各衍生物的液晶临界浓度w分别为28%,37%,24%和27%,均比纯壳聚糖的12%有很大提高 ...
曾志群, 曾海涛, 董炎明
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Construction of Recombinant Pichia pastoris Producing Glycolate Oxidase and Optimization of Catalytic Synthesis of Glyoxylic Acid [PDF]
, 2008 乙醇酸氧化酶（glycolateoxidase,GO）是一种黄素蛋白酶，它以氧作为电子受体，能催化乙醇酸至乙醛酸的氧化反应。产物乙醛酸是一种重要的化工中间体，可以广泛应用于医药、香料、农药等领域。生物法合成乙醛酸具有污染少，转化率高，产品纯度高等优点，因此是很有前途的合成乙醛酸工艺路线。目前生物法合成乙醛酸主要是利用乙醇酸氧化酶将乙醇酸氧化成乙醛酸，同时利用过氧化氢酶消除反应产生的过氧化氢，防止产物的进一步氧化。本研究目的在于通过构建基因工程菌来催化合成乙醛酸，主要内容包括GO的毕赤酵母重组菌构建 ...
潘美平
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Effect of Hot Air Treatment on Maintaining Volatile Components in Strawberry Fruits during Postharvest Storage [PDF]
In this study, the mechanism through which hot air (HA) treatment maintains the volatile components of ‘Benihoppe’ strawberry fruits during postharvest storage was elucidated by analyzing changes in physiological quality, free and bound volatile ...
LIU Bing, ZHANG Tingting, MA Feiyang, ZHANG Yijia, WANG Tiantian, TIAN Chen, ZHOU Dandan, DING Chao, LIU Qiang
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Effect of Sleep-improvement and Mechanism of Yanwo Ejiao Compound in Mice [PDF]
Objective: To evaluate improvement of sleep function and mechanism of Yanwo Ejiao compound in mice. Methods: Balb-c mice were randomly assigned to five groups: A blank control group, a positive drug group, and three Yanwo Ejiao compound groups receiving ...
Bin WANG +3 more
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Studies on Nano Cerium Oxides Catalyzed-oxidation of Lignin into Aromatic Compounds [PDF]
, 2017 基于木质纤维素的生物炼制，不仅能可持续地提供能源和化学品，也可以有效减少温室气体的净排放，为巨量的农业废弃物的高附加值转化提供最佳解决方案。然而，由于木质素是一种结构复杂、性质稳定、难溶、难解聚的芳香高分子，且与纤维素通过物理-化学作用紧密伴生，分离成本昂贵，转化利用困难，成为生物炼制的瓶颈之一。通过对木质素氧化解聚策略和机理的研究，使木质素定向氧化解聚为高附加值的芳香醛/酮/酸等化合物，是提高生物炼制经济性的根本途径。以二氧化铈为代表的部分稀土纳米氧化物在木质素的定向催化氧化反应中表现出优异性能 ...
张宏喜
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Differential Analysis of Five Chinese Fresh Peach Metabolites Based on Non-target Metabolomics [PDF]
Objective: To investigate the differences in metabolites of Chinese nectarine, peento, yellow peach, Yangshan honey peach and Xinyi honey peach by using non-target metabolomics.
Chao TANG +4 more
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