测定8%敌.杀粉剂中敌百虫含量

采用萃取法分离出８％敌．杀粉剂中的敌百虫,再通过测定Ｃｌ＾－的方法测定敌百虫含量,该方法的变异系数为１．４２％,回收率为９９．２％－１０１．３％。     

敌百虫·对硫磷粉剂分析方法的改进

介绍了敌百虫·对硫磷粉剂的一种新的测试方法：经薄层层析分离后采用汞量法测定敌百虫含量,皂化比色法测定对硫磷含量。该方法较原方法更为准确、可靠。方法的回收率在９９％～１０１％之间     

高效液相色谱法测定甲萘威及其游离酚

研究了用反相ＨＰＬＣ测定甲萘威及其游离酚的方法。该方法的标准偏差为：甲萘威：０１９;１ 萘酚：０００１６;２ 萘酚：００００５,回收率为：甲萘威：９８３９％～１０１８２％;游离酚：９７８２％～１００．１５％。     

嘧啶磷及其中间体羟基嘧啶的气相色谱分析

介绍了嘧啶磷气相色谱分析方法, 其中间体羟基嘧啶通过转化成易挥发的三甲基硅醚进行气相色谱分离和测定。方法的变异系数分别为０６ ％ , ０６ ％ ; 回收率分别为９９０ ％ ～１００４ ％ ,９８２ ％ ～１００８ ％ 。     

双氧威的高效液相色谱分析

采用高效液相色谱,以甲醇＋水（６８＋３２）作流动相,外标法测定双氧威原药。方法的标准偏差为０４９,变异系数为０５％,回收率在９９１％～１０１．０％之间。     

40%氰·莠水悬剂的分析

采用反相高效液相色谱法,以甲醇＋ 水＝ ６５ ＋ ３５（ｖ／ｖ） 为流动相,以呋喃酚为内标物,紫外检测器对氰草津和莠去津水悬剂进行分离和测定。结果表明：氰草津和莠去津含量测定的精密度的标准偏差分别为：０３８ 、０２５ ;变异系数分别为：２０１ ％ 、１３８ ％ , 回收率分别为：９８９ ％ ～９９５ ％ 、９９７ ％ ～１０２０ ％ ;线性相关系数分别为０９９９４７ 、０９９９１４     

HPLC法定量分析30%克·多·福大豆种衣剂

报道了３０％克·多·福大豆种衣剂的高效液相色谱分析方法,本方法采用异丙醇—水（每１０００ｍｌ水＋２ｍｌ氨水）为流动相,以２００ｍｍ×４０ｍｍ（ｉｄ）不锈钢柱,内装Ｎｏｖａ－ｐａｋＣ１８填充物（５μｍ）,在２１０ｎｍ波长下进行测定。方法回收率克百威、多菌灵、福美双均在９８％～１０２％之间,标准偏差分别为０２４,０１３和０２０,变异系数分别为１６％,２６％和２０％。     

1-氨基-4-溴蒽醌-2-磺酸的HPLC测定

建立了一种测定１ 氨基 ４ 溴蒽醌 ２ 磺酸的高效液相色谱（ＨＰＬＣ）方法。以甲醇—水为流动相，四丁基溴化铵为离子对试剂，２ 萘酚为内标物，检测波长为２４０ｎｍ，线性范围为０～０１８ｍｇ／ｍｌ，浓度测定的变异系数为０２０％～０３４％。     

液相色谱仪测定水中苯并(α)芘方法应

液相色谱仪测定水中苯并（α）芘方法实用性好，检测精密度高，标准偏差为 ００８６ ３， 变异系数０８７％ ，回收率高，平均达 ９３１％ ，而且操作简单、便于掌握     

对硫磷——敌百虫混合粉剂质量检验方法的试验

敌百虫和对硫磷(或甲基对硫磷)混合粉剂作为六六六粉剂的代用品已推广应用。药效试验结果证实,在杀虫范围和防治效果方面优于六六六粉剂。我们根据敌百虫和对硫磷及甲基对硫磷的理化性质,单剂产品质量检验方法、条件以及生产工艺条件和载体特性,提出了2.5％(3.5％)敌百虫与1.5％对硫磷(或甲基对硫磷)混合粉剂质量检验方法,并进行了测定条件的试验。试验结果表明,此方法操作简便、快速,分析结果准确可靠,重现性好,适用于工业生产。     

新型磷系阻燃剂四苯基(双酚-A)二磷酸酯阻燃PC/ABS的研究

利用自制的四苯基(双酚-A)二磷酸酯(BDP)及其复配体系制备了阻燃PC/ABS,研究了阻燃PC/ABS的力学性能、氧指数(LOI)和垂直燃烧测试性能(UL94)、材料的阻燃性能和烟气释放。结果表明:采用15%的BDP阻燃PC/ABS,材料的冲击强度下降了12.82%,LOI达到30.0%,UL94阻燃性能达到V—0级,平均热释放速率(av-HRR)和最大热释放速率(pk-HRR)分别下降了35.84%和31.17%,点燃时间(TTI)延长18s,火势增长指数(FGI)下降了46.72%,比消光面积(SEA)上升了6.68%;采用BDP/APP复配阻燃PC/ABS,材料的冲击强度最大降幅为33.33%,LOI最大可达30.1%,UL94阻燃性能由V—0级降为V—1级,av-HRR和pk-HRR最大分别下降40.89%和31.2%,TTI最大延长20s,FGI最大降幅为50.37%,SEA最大涨幅为11.14%;采用BDP/纳米SiO2复配阻燃PC/ABS,当纳米SiO2的添加量为7%时,材料的冲击强度上升了5.13%,LOI达到31.1%,UL94阻燃性能达到V—0级,av-HRR和pk-HRR分别下降了43.18%和4069%,TTI延长20s,FGI降幅为59.12%,平均比消光面积(av-SEA)涨幅为8.09%,6min内av-SEA下降6.92%,(6min总发烟指数)TSPI6min下降5.54%,阻燃、抑烟效果最佳,对PC/ABS材料的力学性能影响最小。     

Preparation and characterization of soy protein isolate/SiO2 nanocomposite films and their walnut oil microcapsules

In this study, nano-SiO₂/soy protein isolate composite film was prepared by casting method. The effects of (adding 0%, 1%, 3%, 5%, 7%, and 9% w/w) nano-SiO₂ on the properties of the resulting blend films were investigated. Results showed that the addition of 5% nano-SiO₂ exhibited good barrier properties. The mechanical properties including tensile strength and elongation at break of the film with 7% nano-SiO₂ is increased by 82.6% and 31.49% correspondingly. Differential scanning calorimetry indicated that the melting temperature of the composite film is increased by 56.6°C compared with the pure film. The wall material modified by nano-SiO₂ (adding 1%, 3%, 5%, 7%, and 9% w/w) was used for encapsulating walnut oil by spray drying. After accelerating oxidation test at 63°C for 12 days, we found that the encapsulation efficiency value of walnut oil microcapsules with 0%, 1%, 3%, 5%, 7%, and 9% nano-SiO₂ decreased by 64.23%, 48%, 21%, 22%, 21.00%, and 31% respectively. The results suggested that the stability of the core material was improved by adding nano-SiO₂ to the wall material.     

尼龙6/纳米蒙脱土母料的水辅法制备及性能

依据水是蒙脱土的膨胀剂原理,通过实验研究水辅熔融法制备尼龙6/纳米蒙脱土母料的可行性,以及工艺条件、含量对纳米母料制备的影响.在此基础上,通过母料制备尼龙6/蒙脱土纳米复合材料,并对其力学性能与热变形温度进行测定.实验表明:通过水辅熔融法能够制备尼龙6/纳米蒙脱土母料;采用15%与30%蒙脱土含量的母料与尼龙6分别按1:4与1:9的比例稀释,两种稀释样品与纯尼龙6相比,拉伸强度分别提高了约24%与11%,弹性模量分别提高了49.8%与22.9%,弯曲强度分别提高了近66.6%与26%,弯曲模量分别提高了85%与16.7%,热变形温度明显提高.     

Dehydrochlorination of propylene chlorohydrin with sodium hydroxide and with catholyte

Dehydrochlorination of an aqueous solution of propylene chlorohydrin with sodium hydroxide (12·5 and 30% by weight), with catholyte (5 or 10% by weight NaOH + 14% by weight NaCl) and with milk of lime (15% by weight) were compared. The use of catholyte (10% by weight NaOH + 14% by weight NaCl) enables propylene oxide to be obtained in a yield of 94·3%, with 100% conversion of chlorohydrin. The concentration of 1,2-propylene glycol in the waste is 0·07% by weight.     

Fat Concentration in Commercial Minced Meat

Fat concentrations were measured in minced beef and beef-pork samples in order to detect the average amounts of fatty and low-fatty meat. A total of 98 meat samples were examined, among which 59 % of the minced beef samples and 20 % of the beef-pork samples contained less than 10% fat by weight. The minced beef altogether contained about 9.4% fat by weight and the beet-pork about 15% by weight. The lowest fat concentration measured was 1.9% by weight and the highest 24 % by weight.     

由糠醛合成富马酸亚铁

糠醛经Ｖ２Ｏ５催化氧化为富马酸,收率６１％～６５％,再由富马酸与硫酸亚铁反应以８５％～９０％的收率制取富马酸亚铁。由于改善了工艺操作条件,总收率比以苯为原料的传统工艺从２５％～２８％提高到５２％～５９％。分析鉴定表明,富马酸和富马酸亚铁与文献相符。     

阿司匹林片溶出度的测定及结果分析

采用转蓝法测定了药剂学实验中学生自制阿司匹林片的溶出度,以判断制剂溶出度是否合格。结果分析表明：2005级药物制剂班制备的阿司匹林片测得数据为49.03%±5.03%,2005级药学班制备的阿司匹林片测得数据为29.68%±11.42%,均小于80%,溶出度不合格。进行因果分析后,严格规范操作,更换黏合剂后,教师制备的阿司匹林片测得数据为82%±6.23%,大于80%,得到溶出度合格的产品。     

Fatty Acid and Sugar Composition of Acorus calamus Linn

The rhizomes of Acorus calamus Linn. (Araceae family) were examined for the content and composition of fatty acids and sugars. Composition of the mixed fatty acids, as indicated by gas chromatography of the corresponding methyl esters, were myristic (1.3%), palmitic (18.2%), palmitoleic (16.4%), stearic (7.3%), oleic (29.1%), linoleic (24.5%) and arachidic (3.2%). The nature of the sugars was defined by paper chromatography and confirmed by direct comparison with authentic samples. Composition of the sugars, as indicated by densitometer, were maltose (0.2%), glucose (20.7%) and fructose (79.1%).     

海南红厚壳花浸膏、精油的提取及化学成分分析

分别用水蒸气蒸馏法、溶剂法以及CO2超临界萃取法,对海南红厚壳鲜花进行精油、浸膏提取。3种不同提取方法的得油率分别为0.059%、0.33%、0.20%。用GC-MS技术对其进行了化学成分分析鉴定,并比较不同提取方法所得产物化学成分的异同。水蒸气蒸馏法所得精油共鉴定出25种化合物,主要成分为w(大根香叶烯)=22.62%、w(反式-石竹烯)=12.03%、w(β-倍半水芹烯)=19.00%;石油醚浸提所得浸膏鉴定出25种化合物,主要成分为w(大根香叶烯)=21.24%、w(β-倍半水芹烯)=9.07%、w(高香叶烯)=5.69%;超临界CO2萃取所得浸膏鉴定出19种化合物,主要成分为w(大根香叶烯-D)=17.70%、w(反式-石竹烯)=15.43%、w(16-贝壳松烯)=11.55%、w(α-柯拜烯)=10.62%。     

乙二醛的应用市场

1997年,我国乙二醛的市场消费量约为1.0万t(按40％计),其中60％～70％靠进口解决。纺织和印染工业占乙二醛市场的50％,造纸行业占30％,医药、化工占15％,其它占5％。