Quantitative determination of UV filters in sunscreen lotions using microemulsion electrokinetic chromatography

Microemulsion electrokinetic chromatography (MEEKC) has been applied to the separation of some UV filters (Eusolex 4360, Eusolex 6300, Eusolex OCR, Eusolex 2292, Eusolex 6007, Eusolex 9020, Eusolex HMS, Eusolex OS, and Eusolex 232) commonly used in sunscreen lotions. Use of a MEEKC buffer with a mixed surfactant system to stabilize the oil droplets and an organic modifier in the aqueous phase allowed separation of most of the selected analytes in a single run in a system fitted with a diode array detector recording three wavelengths (240 nm, 300 nm, and 380 nm) simultaneously. The microemulsion employed consisted of 2.25 g of SDS, 0.75 g of Brij 35, 6.6 g 1‐butanol, 0.8 g n‐octane, 17.5 g 2‐propanol, and 72.1 g of 10 mM borate buffer (pH 9.2). Detection limits from 0.65 to 6.0 μg/mL were obtained and the calibration plots were linear over at least one order of magnitude for all analytes. The developed method could be applied to the determination of UV filters in several sun protection products including lotions, milks, and oils. Comparison of the obtained data with those from an HPLC method described in the literature showed acceptable agreement.     

锦州近海海域磷污染主要原因及其对策

通过锦州近海海域总磷年际变化趋势和城乡使用含磷洗衣粉和洗洁剂数量的增长变化，对辽东湾近年来赤潮出现的原因进行探索，并提出治理对策。     

N,N-二乙基间甲基苯甲酰胺的合成研究

N,N-二乙基间甲基苯甲酰胺 ,简称 DETA或 DEET是一种特效驱蚊剂 ,也是一种广谱驱虫剂 ,具有安全无毒、使用方便等特点。本文研究了以间甲基苯甲腈及二乙胺基锂为原料采用“一锅法”合成 DETA.     

柏栀祛湿洗液治疗湿疹的疗效观察

目的：评价柏栀祛湿洗液治疗湿疹的临床疗效.方法：将89例湿疹患者随机分为两组,分别予以柏栀祛湿洗液洗液（49例）和洁尔阴洗液外洗（40例）.结果：两组显效率分别为81.6%和52.5%,有显著差异（P〈0.01）.结论：柏栀祛湿洗液治疗湿疹的疗效确切.     

搅拌棒吸附萃取-气相色谱-质谱法测定化妆水中多氯联苯

提出了搅拌棒吸附萃取(SRAE)-气相色谱-质谱法测定化妆水中7种多氯联苯含量的方法。采用正交试验方法研究了萃取时间、分散剂种类及体积、热脱附时间及冷阱收集温度对萃取效率的影响。分析中采用DB-5MS毛细管色谱柱作为分离柱,质谱条件为电子轰击电离源全扫描监测模式。7种多氯联苯的峰面积与其质量分数在一定范围内呈线性关系,测定下限(10S/N)在5～60ng.kg-1之间。分别在3个浓度水平对方法的回收率和精密度进行了试验,测得回收率在74%～107%之间,测定值的相对标准偏差(n=6)在1.1%～16.9%之间。     

金属纽扣服用性能研究

简单地介绍了金属纽扣的分类、特点,分析了金属纽扣的抹油技术、电镀技术及唛头生产流程,重点阐述了金属纽扣盐雾腐蚀、拉伸强力、耐洗液腐蚀性能的测试条件、设备、测试步骤及评定方法.     

Molecularly imprinted layer-coated silica nanoparticles for selective solid-phase extraction of bisphenol A from chemical cleansing and cosmetics samples

Highly selective molecularly imprinted layer-coated silica nanoparticles for bisphenol A (BPA) were synthesized by molecular imprinting technique with a sol-gel process on the supporter of silica nanoparticles. The BPA-imprinted silica nanoparticles were characterized by fourier transform infrared spectrometer, transmission electron microscope, dynamic adsorption and static adsorption tests. The equilibrium association constant, K_a, and the apparent maximum number of binding sites, Q_max, were estimated to be 1.25 × 10⁵ mL μmol⁻¹ and 16.4 μmol g⁻¹, respectively. The BPA-imprinted silica nanoparticles solid-phase extraction (SPE) column had higher selectivity for BPA than the commercial C18-SPE column. The results of the study indicated that the prepared BPA-imprinted silica nanoparticles exhibited high adsorption capacity and selectivity, and offered a fast kinetics for the rebinding of BPA. The BPA-imprinted silica nanoparticles were successfully used in SPE to selectively enrich and determine BPA from shampoo, bath lotion and cosmetic cream samples.     

漂浮固化分散液液微萃取/气相色谱法测定化妆水中4 种增塑剂

建立了漂浮固化分散液液微萃取(DLLME-SFO)-气相色谱法(GC)同时测定化妆水中4种邻苯二甲酸酯类增塑剂(PAEs)的分析方法,并对萃取剂体积、分散剂种类、分散剂体积、萃取时间、水相pH值、盐浓度等参数进行优化。向样品溶液(化妆水和水的体积比为1∶10,pH 3.0)中快速加入15μL 1-十二醇(萃取剂)和1 300μL乙醇(分散剂),涡旋1 min,4 000 r.min-1离心5 min后,于冰浴中浸泡,待1-十二醇凝固后转移,融化后进行气相色谱分析。结果表明,该方法对4种目标化合物的线性范围为5.0～500.0μg.L-1,检出限为0.001～1.0μg.L-1,回收率为88%～108%,相对标准偏差为1.6%～3.3%。4种目标化合物的富集倍数为800～1 578倍。将该方法与其它测定邻苯二甲酸酯类增塑剂的前处理方法进行对比。该方法操作简单快速、灵敏度高,可满足化妆水中邻苯二甲酸酯类增塑剂的分析要求。     

WSB新型浴足液研制及其杀菌试验

为进一步开发利用Wasabi的药用价值,采用萃取和蒸馏的方法,提取Wasabi中有效成分异硫氰酸酯,用于洗足液的配制和杀菌实验.研究结果表明,Wasabi洗足液对肠道菌和金黄色葡萄球菌等病原菌有明显的杀菌作用,杀菌率为80％～97％,这对于预防脚气病等有一定作用,而且不损伤皮肤.为Wasabi的进一步开发利用开辟了一条...     

铝酸钡净化拜耳赤泥洗液除硫试验研究

研究了用铝酸钡净化拜耳赤泥洗液的除硫条件和效果。当除硫条件为:B=100%,τ=20 min,T=75℃时,除硫率可高达94.5%.提出了铝酸钡净化高硫铝土矿高压溶出液除硫的生产实施推荐工艺流程。