新型再生纤维的开发现状及纤维性能

枯胶纤维是人类制造的第1种再生纤维，以后陆续开发了铜氨纤维、醋酯纤维、富强纤维和高湿模量纤维。这些再生纤维，都是利用自然界中存在的含有纤维物质如棉短绒、木材、甘蔗渣、芦苇等制成的。近年来，随着人类能源欠缺，环境污染，各厂家不断开发新型再生纤维等纺织新原料，以拓宽纺织材料的使用范围。     

Relationship between hyperuricemia and metabolic syndrome

Objective: To investigate the relationship between metabolic syndrome and hyperuricemia. Methods: A total of 2 374 subjects who received health examination in our hospital from Jan. 2004 to Dec. 2006 were enrolled in our study. Hyperuricemia is defined as ≥7 mg/dl (in men) or ≥6.0 mg/dl (in women). Metabolic syndrome was defined using AHA/NHLBI (American Heart Association/National Heart, Lung, and Blood Institute) criteria. Results: (1) The overall prevalence of hyperuricemia was 13.10%. The condition was more common in men than in women (19.07% vs 3.42%). (2) Among men, uric acid concentration is statistically significantly positively correlated with waist circumference, blood pressure, and triglyceride. Uric acid is negatively correlated with serum high-density lipoprotein-cholesterol (HDL-C). Uric acid concentration is most strongly correlated with serum triglyceride (r=0.379) and waist circumference (r=0.297). Among women, statistically significant positive correlations were noted for the serum uric acid concentrations with waist circumference, triglyceride and fasting plasma glucose. Serum triglyceride (r=0.329) and waist circumference (r=0.234) are most strongly correlated with uric acid concentrations. (3) Men with hyperuricemia had a 1.634-fold increased risk of metabolic syndrome as compared with those without hyperuricemia odds ratio (OR)=1.634, P=0.000. Women with hyperuricemia had a 1.626-fold increased risk of metabolic syndrome (OR=1.626, P=0.000) as compared with those without hyperuricemia. Conclusion: Hyperuricemia is prevalent among Chinese population. Additionally, serum uric acid is positively associated with metabolic syndrome.     

一种新型光学纯胡椒醛基氮杂环丙基羧酸酯的合成与表征

为发展新型手性配体,降低手性催化剂的合成成本,检验由芳醛与手性氨基酸酯缩合、还原反应的普适性,以L-丝氨酸为手性源,经酯化,缩合,还原氨化,关环等反应,设计合成了一种新的胡椒醛基氮杂环丙基羧酸酯5,其结构通过IR,1H NMR,13C NMR,HRMS进行了表征.发展了一条高效便捷合成这类具有光学活性化合物的方法.     

α-酮酸的应用及合成研究进展

α-酮酸是一类双官能团有机化合物,是有机合成、药物合成及生物合成的重要中间体,已广泛应用于食品、化妆品、药物及有机合成中。本文综述了近年来α-酮酸的应用及合成进展情况,其合成方法包括氧化法、水解法、格氏试剂法、羰基化法、海因法及F-C酰基化法,并对这些合成方法及其应用前景进行了讨论。     

固态合成硬脂酸十八醇酯的研究

在无溶剂状态下,以十八醇和硬脂酸为原料,以对甲苯磺酸(PTSA)为催化剂,微波协助合成了硬脂酸十八醇酯.利用正交实验法探究了酯化反应的各种影响,其影响因素的大小依次为D>A>C>B;其反应的最优条件:醇酸物质的量比(A)为1∶1.2,催化剂用量(B)为0.2 g,微波辐射功率(C)为514 W,微波辐射时间(D)为40 m in,产率可达94.35%.     

固定化脂肪酶合成蔗糖月桂酸酯的研究

以固定化脂肪酶为催化剂,以DMSO/叔丁醇有机溶剂为反应体系,在室温条件下催化合成蔗糖酯。研究表明:月桂酸与蔗糖的摩尔比为大于8,反应温度为30℃,脂肪酶用量为0.3g,缓冲液的pH值为7.5,反应6h时,酯化反应的相对转化率较高。反应产物的薄层色谱和红外光谱分析结果证实所合成的产物为蔗糖月桂酸酯。     

蔗糖酯性能与结构的关系

综述了蔗糖酯的表面活性、稳定性、生物活性、毒性等特性及应用性能与分子结构的关系,简要介绍了蔗糖酯在日用化学品、食品、制药等行业的应用前号,为蔗糖酯的研制开发和选用奠定了基础。     

杭城房地产广告策划初探--对广告卖点的思考

2000年杭州市商品房价格上升幅度在全国大中城市中位居第一.与此同时,杭城的广告策划、营销咨询业也均以房地产商为最主要的客户源,几乎成为杭州广告业的支柱.市场化运作的大浪淘沙中,成败得失的经验十分丰富.本文将从杭州市第二届西湖博览会人居展中,各主要房地产楼盘的资料与背景情况分析入手,概括总结主要的策划内容以及它们针对目标销售群体的效果,提出作者对于各个广告卖点的思考.     

微波辐射相转移催化合成苯甲酸苄酯

在实验室条件下,采用微波辐射技术和相转移催化剂,以水为溶剂合成了苯甲酸苄酯。其最佳反应条件是:苯甲酸0.10mol,氯化苄0.20mol,相转移催化剂十六烷基三甲基溴化铵(HDTMAB)5mmol,微波功率800w,微波辐射时间10min,产率达到86.4%。