小叶女贞果实花色素的开发利用研究

本文对小叶女贞果实花色素进行了研究,并测定其种子中的氨基酸和油脂含量。结果表明,小叶女贞果实花色素含量高达1200～1600mg/100g,种子中的氨基酸和油脂含量为14.3％和18.7％。     

测定饲料蛋白质含量的一种新方法

本文介绍一种测定各种饲料蛋白质含量的新方法—蛋白质水解茚三酮法。将标准蛋白和几种饲料样品加3％H_2SO_4,直接加热6小时,通过蛋白质水解产生的氨基酸与茚三酮反应的光吸收值,计算总蛋白量;与未水解的标样及饲料样品的甲醇提取液的茚三酮反应吸收值之差计算去游离氨基酸的纯蛋白质量。本法与凯氏氮素定量法无显著差异,与DAVID L·MARKKS报导的密封水解24小时的效果相同。     

Ferric chloride-catalyzed decarboxylative alkylation of β-keto acids with benzylic alcohols

β-Keto acids are unstable to heat,acids,and bases,and have rarely been employed as carbon nucleophiles for the formation of carbon-carbon bonds.In this context,an efficient decarboxylative alkylation reaction of β-keto acids with benzylic alcohols has been developed,for the first time,through sequential cleavage of carbon-oxygen and carbon-carbon bonds.In the presence of 10 mol% of ferric chloride,a range of β-keto acids smoothly undergo decarboxylative alkylation with benzylic alcohols to give structurally diverse unsymmetric ketones in moderate to excellent yields and with extremely high regioselectivity.Preliminary mechanistic studies indicate that the reaction proceeds through an SN1 alkylation followed by decarboxylation.     

氨基酸螯合铁的研究及应用现状

对氨基酸螯合铁的吸收机制、吸收作用的特点、化学和生物化学制备方法及其在饲料、食品中的应用现状进行了综述,提出了目前氨基酸螯合铁研究及应用中存在的主要问题和今后发展的方向.     

氨基化纳米二氧化钛的热稳定性分析

以基于赖氨酸原位修饰法制备的氨基化纳米二氧化钛进行不同煅烧温度下的热稳定性分析。用 SEM和FT-IR表征手段分析了在不同煅烧温度下氨基化纳米二氧化钛的形貌及结构,用 DTA-TG测量了它们的热失重曲线。结果表明：500℃以下的煅烧不会对材料的形貌结构产生太大的影响,氨基基团仍然存在;并且经过300℃的高温处理后,它的稳定性也有一定程度的提高。     

抗性淀粉的生物学功效及在食品加工中的应用

抗性淀粉是一种具有多种生物学功效的新型膳食纤维,且兼具类似于淀粉的优良加工特征,适合于开发品种多样的高膳食纤维功能性食品。抗性淀粉的研究与应用目前已成为国内外食品行业的热点,介绍了抗性淀粉的分类,及其在糖代谢、脂代谢、体重控制,作为益生元和防治直肠癌方面的生物学功效;分析了抗性淀粉在面包糕点、油炸食品、面条、益生菌类食品加工领域中的应用。     

羧酸类有机锡化合物合成及结构研究概况

羧酸类有机锡化合物的合成规律和结构特点,是目前此类化合物研究的热点问题之一。概述了一烃基锡羧酸酯、二烃基锡羧酸酯和三烃基锡羧酸酯合成及其结构的研究现况。     

Structural Prediction of Membrane Protein: Application to Known Structures

Membrane proteins are embedded in the lipid bilayer,which creates a suitable environment for their actions. It is important to decide which tpye it belongs to because it is closely relevant to its biological fumction and its interaction process with other molecules in a biological system. Membrane proteins have different types. The function of a membrane protein is closely correlated with the type it belongs to. In this study, on the basis of the concept of pseudo amino acid (PseAA) composition originally introduced by Chou, the value of approximate entropy (ApEn) of the query membrane protein was used to integrate the complementary information. By fusing fifteen powerful individual fuzzy K-nearest neighbor (FKNN) classifiers, an ensemble classifier was presented.Each basic classifier was trained in PseAA composition of membrane protein sequences with different parameters. The results of experiments demonstrate it is efficient for the structural prediction of membrane proteins.     

新手性Schiff碱的合成及其不对称加成反应的研究

合成了４个手性Ｓｃｈｉｆｆ碱，探讨了它们与亚磷酸酯的不对称加成，立体选择性对加成反应的影响为：Ｍｅ＜Ｅｔ＜ｎ－Ｐｒ＜ｉ－Ｐｒ，即Ｒ的体积效应与立体选择性相一致，合成并分离出了８个新手性（＋）或（－）α－（３－莰２’－基脲基）氨基卤苄基膦酸二烃基酯，它们的结构均经过ＩＲ，３１ＰＮＭＲ，１ＨＮＭＲ等确证．