双波长分光光度法测定复方间苯二酚洗剂中间苯二酚的含量

目的 :用双波长分光光度法测定复方间苯二酚洗剂中间苯二酚的含量。方法 :以水为溶剂 ,在273 5nm和266 1nm波长处测定吸收度并计算差值。结果 :间苯二酚在20 32～60 96μg/ml浓度范围内线性关系良好 (r=0 9998) ;平均回收率为99 59 % ,RSD=0 45% (n=9)。结论 :本方法简便、快捷 ,测定结果准确     

Dermatitis from phenyl salicylate in safety spectacle frames

We report 3 cases of allergic contact dermatitis behind the ears from wearing the same brand of industrial safety spectacles. In each case, a positive patch test was obtained with scrapings of the plastic frame. In 2 cases further patch tests with constituents of the plastic were carried out; positive patch tests were obtained with phenyl salicylate. Phenyl salicylate is used as an ultraviolet inhibitor in some cellulose acetate butyrate and cellulose acetate propionate formulae. It has previously been reported as a contact sensitizer from its use as a sun screen in a lip salve. Positive patch test reactions were also obtained variously in these patients with balsam of Peru, resorcinol monobenzoate, and epoxy resin.     

The first synthesis of [2‐13C]phloroglucinol

A fast and efficient synthesis of [2‐¹³C]phloroglucinol in six steps from acyclic, non‐aromatic precursors is presented, with regioselective placement of a ¹³C‐atom in the aromatic ring. The ¹³C‐label was introduced by reaction of [¹³C]methyl iodide with methyl 4‐chloroformyl butyrate. Cyclization via an intramolecular Claisen condensation, followed by aromatization gave [2‐¹³C]resorcinol. Following subsequent methylation of the hydroxyl groups, the third hydroxyl group was introduced using an iridium‐catalysed C–H activation/borylation/oxidation procedure. Demethylation then yielded the desired [2‐¹³C]phloroglucinol. Copyright © 2010 John Wiley & Sons, Ltd.     

Problems associated with use of the benzyloxymethyl protecting group for histidines Formaldehyde adducts formed during cleavage by hydrogen fluoride 1

The use of N^α-tert.-butyloxycarbonyl-N^π benzyloxymethylhistidine in peptide synthesis resulted in significant levels of several different side products attributable to the generation of formaldehyde during the hydrogen fluoride cleavage reaction. Methylated impurities in a decapeptide were isolated and identified. These methylated impurities were attributed to the use of the benzyloxymethyl protecting group for the histidines, since the impurities did not form when the dinitrophenyl protecting group was used. Also, peptides containing benzyloxymethyl-protected histidines in addition to N-terminal cysteines quantitatively yielded their respective N-terminal thiazolidine derivatives upon isolation from standard hydrogen fluoride cleavage mixtures. Thiazolidine ring formation was circumvented by including in the cleavage reaction a formaldehyde scavenger such as cysteine hydrochloride or resorcinol.     

防止复方间苯二酚洗剂变色的方法研究

目的分析复方间苯二酚洗剂变色的原因并找出解决办法。方法根据复方间苯二酚洗剂处方的性质,参照抗氧剂和金属络合剂的常用浓度,在复方间苯二酚洗剂中分别加入0.2%焦亚硫酸钠、0.2%亚硫酸氢钠、0.2%焦亚硫酸钠＋0.2%亚硫酸氢钠、0.2%焦亚硫酸钠＋0.15%硫代硫酸钠、0.2%焦亚硫酸钠＋0.02%乙二胺四乙酸二钠、0.2%焦亚硫酸钠＋0.1%维生素C,分组放置180 d,于不同光照条件下,观察其颜色变化和含量情况。结果加0.2%焦亚硫酸钠＋0.2%亚硫酸氢钠组放置90 d、120 d、180 d后,其颜色和含量测定均符合规定,且显著优于其他各组（P〈0.01）。结论选用0.2%焦亚硫酸钠＋0.2%亚硫酸氢钠为复方间苯二酚洗剂的抗氧剂,能有效解决该洗剂的变色问题。     

Modulation of human α(4)β(2) nicotinic acetylcholine receptors by brominated and halogen-free flame retardants as a measure for in vitro neurotoxicity

Brominated flame retardants (BFRs) are abundant persistent organic pollutants with well-studied toxicity. The toxicological and ecological concern associated with BFRs argues for replacement by safer alternatives. However, the (neuro)toxic potential of alternative halogen-free flame retardants (HFFRs) is unknown. Previous research identified the nervous system as a sensitive target organ for BFRs, with modulation of excitatory nicotinic acetylcholine (nACh) receptors as one of the modes of action. Since it is essential to assess the (neuro)toxic potential of HFFRs before large scale use, we measured the effects of three BFRs and 13 HFFRs on the function of human α(4)β(2) nACh receptors, expressed in Xenopus oocytes, using the two-electrode voltage-clamp technique. The results demonstrate that some BFRs (TBBPA and to a lesser extent BDE-209) and HFFRs (TPP, Alpi, APP, MMT and to a lesser extent ATH, ATO, MHO, MPP, RDP and ZHS) act as nACh receptor antagonists. Contrary, BPS, BDP, DOPO and ZS were unable to modulate nACh receptors. Despite the lack of toxicological data on HFFRs and the need for additional studies to perform a full (neuro)toxic risk assessment, the current data on antagonistic effects on nACh receptors could be an important step in prioritizing viable HFFRs for substitution of BFRs.     

防止复方间苯二酚洗剂变色的方法研究

目的分析复方间苯二酚洗剂变色的原因并找出解决办法。方法根据复方间苯二酚洗剂处方的性质,参照抗氧剂和金属络合剂的常用浓度,在复方间苯二酚洗剂中分别加入0.2%焦亚硫酸钠、0.2%亚硫酸氢钠、0.2%焦亚硫酸钠+0.2%亚硫酸氢钠、0.2%焦亚硫酸钠+0.15%硫代硫酸钠、0.2%焦亚硫酸钠+0.02%乙二胺四乙酸二钠、0.2%焦亚硫酸钠+0.1%维生素C,分组放置180 d,于不同光照条件下,观察其颜色变化和含量情况。结果加0.2%焦亚硫酸钠+0.2%亚硫酸氢钠组放置90 d、120 d、180 d后,其颜色和含量测定均符合规定,且显著优于其他各组(P<0.01)。结论选用0.2%焦亚硫酸钠+0.2%亚硫酸氢钠为复方间苯二酚洗剂的抗氧剂,能有效解决该洗剂的变色问题。     

Contact dermatitis to estradiol benzoate

Three patients developed facial dermatitis after contact with preparations containing estradiol benzoate. Patch tests were positive to estradiol henzoate 0.1% in MEK but negative to other related estrogens including estradiol. All three patients also had positive tests to resorcinol monobenzoate and two out of three to balsam of Peru.
Most likely estradiol benzoate was the primary sensitizer.