P2O5缓释法制备磷酸酯加脂剂

对磷酸化蓖麻油甲酯合成工艺进行试验研究 ,以 P2 O5为磷酸化试剂 ,探讨了用无毒溶剂分散 P2 O5的投料方式合成磷酸酯的新方法对磷酸化蓖麻油甲酯合成工艺进行试验研究 ,以 P2 O5为磷酸化试剂 ,探讨了用无毒溶剂分散 P2 O5的投料方式合成磷酸酯的新方法     

我国酱油行业需要巨人的崛起

0前言 　　酱油是我国最为传统的调味品之一.在两千多年封建制度的束缚下,我国酱油一直采用天然发酵工艺和手工作坊式的生产.解放后,我国的酱油生产虽然走上了工业化大生产之路,但其间也颇多坎坷,历经50多年,酱油行业仍未形成一个稳定、健康的发展局面.品牌众多,但绝大多数产品仍是地域性的,品质平平,缺乏竞争性,技术水平总体较为落后等.倒是从我国流传过去的日本酱油生产技术有了较大的发展,19世纪以来,逐步形成了工业化生产,成为世界酱油强国. 　　……     

兰州拉面专用粉对春小麦品质的要求——Ⅱ小麦籽粒面筋蛋白组成含量与品质的关系

共选用30份春小麦材料,参照Singh等[1]和Verbruggen等[2]方法,提取出不同材料的面筋蛋白、高分子量麦谷蛋白亚基(HMW-GS)和低分子量麦谷蛋白亚基(LMW-GS)。通过测定各蛋白组分的含量及比例,同时结合不同材料的理化品质、面团流变学特性以及拉面食用品质进行多元相关分析,结果表明:麦谷蛋白含量与小麦籽粒蛋白含量、湿面筋含量、面筋指数、干面筋含量呈显著正相关;与面团弹性、延伸性以及面团筋力也呈显著正相关;与拉面食用韧性、粘性以及总评分呈显著正相关。HMW-GS含量与小麦湿面筋和干面筋含量呈显著正相关;与面筋指数呈显著负相关。在面团品质方面,HMW-GS含量与面团韧性呈显著正相关,而与LMW-GS与面团延伸性和面团筋力为显著正相关。HMW-GS含量与拉面最终评分呈显著负相关,相反LMW-GS与拉面最终评分呈显著正相关。     

以大米为原料联产大米蛋白和酒精的生产工艺研究

早籼米为原料,碱法提取大米蛋白并把提取蛋白质后的物料发酵制备酒精.研究了大米粉粒度、碱液浓度、料液比、提取时间以及提取温度等因素对大米蛋白纯度和提取率的影响,对比了提取部分蛋白质后的物料和大米粉发酵制备酒精的效果.实验确定了提取大米蛋白的较佳工艺条件为:大米粉粒度为过0.8 mm筛、碱液浓度0.05 moL/L、料液比1:4、提取时间3 h、提取温度30℃.此条件下提取得到的大米蛋白纯度为94.5%,提取率为52.0%.大米提取部分蛋白质后对发酵制备酒精的影响不大:最主要是发酵时间延长.     

集聚区牵伸倍数对紧密纱质量的影响

为了探讨紧密纺集聚区牵伸倍数对成纱质量的影响,在自行改造的EJM128K-SM型细纱机上进行了纺纱试验.集聚区牵伸倍数采用1.03倍～1.10倍,测试了CJ 14.6 tex紧密纱的毛羽、强伸性能及条干均匀度指标.结果表明:集聚区牵伸倍数对成纱质量有影响,随着集聚区牵伸倍数增大,紧密纱毛羽增多;集聚区牵伸倍数过大或过小,紧密纱断裂强力、强力CV、断裂伸长率等强伸性能指标较差,成纱条干均匀度也会有轻微的恶化.综合分析,纺CJ 14.6 tex紧密纱,集聚区牵伸倍数以1.05倍为宜.     

入境废纺织原料环控标准要点的探讨

为了更准确地理解入境废纺织原料的环控标准,通过对入境废纺织原料口岸检验的实践与环控指标的普查,对入境废纺织原料环控标准中各方需要关注与掌握的分类监管条件、危险废物鉴别检验、放射性检测等要点进行了分析.对各方在入境废纺织原料的监管、经营、使用、规避环保风险,作好废物原料资源利用提出了建议.     

高剪切纤维离解机对漂白麦草浆纸浆物理性能的影响

用一种新型高剪切纤维离解机处理漂白麦草浆,并对纸浆性能及浆张物理性能进行测定。结果表明:打浆度略有下降6.5°SR,纸浆滤水性能得到提高,保水值有所下降。浆张平滑度、透气度和松厚度均得到提高,撕裂指数上升,但浆张的抗张强度和耐破指数下降。     

电位滴定法测定葡萄酒中还原糖含量的研究

根据直接滴定法的原理,应用电位滴定法测定了葡萄酒中的还原糖含量。结果表明,该法检测灵敏度高,方便快捷,测定结果符合葡萄酒中糖含量标准。检测结果的标准偏差为0.09,RSD为4.09%,回收率在92.8%～113.2%之间,平均回收率为102.16%。     

电位滴定法测定葡萄酒中还原糖含量的研究

根据直接滴定法的原理，应用电位滴定法测定了葡萄酒中的还原糖含量。结果表明，该法检测灵敏度高，方便快捷，测定结果符合葡萄酒中糖含量标准。检测结果的标准偏差为0．09，RSD为4．09％，回收率在92．8％～113.2％之间，平均回收率为102．16％。     

Air-water exchange of polychlorinated biphenyls in the Delaware River

The air-water exchange of polychlorinated biphenyls (PCBs) often results in net volatilization, which is thought to be the most important loss process for PCBs in many systems. Previous investigations of the air-water exchange of PCBs have been hampered by difficulties in treatment of the uncertainty in the calculation of air/water fugacity ratios. This work presents a new framework for the treatment of uncertainty, where uncertainty in physical constants is handled differently from random measurement uncertainty associated with random samples, and it further investigates the sorption of PCBs to colloids (dissolved organic carbon). Simultaneous measurements of PCBs in the air and water of five water quality management zones of the Delaware River were taken in 2002 in support of the total maximum daily load (TMDL) process. Gas-phase concentrations of IPCBs ranged from 110 to 1350 pg m(-3), while dissolved water concentrations were between 420 and 1650 pg L(-1). Shallow slopes of log Koc vs. log Kow plots indicated a colloidal contribution to the apparent dissolved-phase concentrations, such that a three-phase partitioning model was applied. Fugacity ratios for individual congeners were calculated under the most conservative assumptions, and their values (log-transformed) were examined via a single-sample T-test to determine whether they were significantly less than 1 at the 95% confidence level. This method demonstrated that air-water exchange resulted in net volatilization in all zones over all cruises for all but seven high molecular weight congeners. Calculated net fluxes ranged from +360 to +3000 ng m(-2) d(-1) for sigma PCBs. The colloidal correction decreased the volatilization flux of sigma PCBs by approximately 30%. The decachlorinated congener (PCB 209), exhibited unusually high concentrations in the suspended solids, especially in the southern portions of the river, indicating that there is a distinct source of PCB 209 in the Delaware River.