Facile electrosynthsis of poly (pyrene-1-sulfonic acid sodium salt) film: A good candidate for blue light-emitting diodes applications

Pyrene-1-sulfonic acid sodium salt (PyS) was chemically synthesized, and its polymer film, poly (pyrene-1-sulfonic acid sodium salt) (PPyS), was successfully electropolymerized by direct anodic oxidation both in aqueous and boron trifluoride diethyl etherate (BFEE) systems. The PPyS films showed good redox activity and structural stability even in SA. The impedance spectra of PPyS films indicated that the electron transfer resistance was about 23 Ω. The fluorescent result exhibited that the emission band of PPyS was red-shifed at least 76 nm in comparison with the monomer. Both the impedance and the fluorescent spectra demonstrated that the PPyS films were good semiconducting polymer and excellent blue-light-emitting materials, respectively.     

再生橡胶制备中氧化程度控制对再生橡胶性能的影响

通过添加过氧化氢或过碳酸钠考察废胶粉再生过程中氧化程度对再生橡胶性能的影响。结果表明:废胶粉再生配方中添加过氧化氢或过碳酸钠后,再生橡胶的溶胶质量分数增大,门尼粘度下降,强伸性能有所改善;综合考虑再生橡胶的加工性能和强伸性能,过氧化氢用量以0.7份为宜,过碳酸钠用量以1.8份为宜,过碳酸钠的再生效果更好。     

Characterization of alendronate sodium-loaded UHMWPE for anti-osteolysis in orthopedic applications

Ultra-high molecule weight polyethylene (UHMWPE) loaded with alendronate sodium (ALN), a potential drug to prevent debris-induced osteolysis, was developed in our previous study. This study aims to investigate the wear performance of UHMWPE-ALNs. In this study, wear test, mechanical test, differential scanning calorimetry (DSC) and contact angle test were applied to characterize the wear performance, mechanical behavior and physical properties of UHMWPE-ALNs. The effect of ALN on the wear performance of UHMWPE-ALNs was investigated by scanning electron microscope (SEM), back scattering electrons (BSE) and energy dispersive X-ray spectrum (EDX). The results of wear test showed that the friction coefficient and volumetric loss of UHMWPE-ALN 0.5 wt.% were comparable with those of UHMWPE. The result of SEM-BSE-EDX revealed that the wear debris detached easily from the ALN-agglomerated regions, which was mainly responsible for the decrease of wear resistance of UHMWPE-ALN 1.0 wt.%. The loaded ALN resulted in the increase of hydrophilicity of UHMWPE-ALNs. The decrease of toughness and crystallinity of UHMWPE-ALN 1.0 wt.% attributed to the non-uniform distribution of ALN. The UHMWPE-ALN 0.5 wt.%, in which no ALN agglomeration was observed, possessed approving mechanical properties and wear performance, might have potential clinical application to prevent the debris-induced osteolysis in prosthetic joints.     

Epigallocatechin gallate (EGCG) binds to low-density lipoproteins (LDL) and protects them from oxidation and glycation under high-glucose conditions mimicking diabetes

The aim of this study was to determine whether low-density lipoprotein (LDL)-bound epigallocatechin gallate (EGCG) attenuates LDL oxidation and glycation under high-glucose (HG) conditions mimicking diabetes. Pooled plasma was preincubated with EGCG for three hours, followed by sequential ultracentrifugation and extensive dialysis to isolate LDL. The kinetics of α-tocopherol and EGCG consumption in LDL were measured by a solid-phase extraction system with HPLC-diode array detection (HPLC-DAD) upon oxidation. EGCG enrichment effectively increased the resistance of LDL to oxidation caused by HG/Cu²⁺. A dose-dependent inhibition of HG-mediated long-term glycation of LDL was also observed by LDL-bound EGCG. Data from HPLC-DAD demonstrated that EGCG was able to bind lipoproteins and to facilitate the antioxidant and antiglycation properties of LDL. This study suggests that loading plasma with EGCG is an efficient way to increase the content of this phytochemical in LDL, which may imply favourable in vivo activity of EGCG in diabetes.     

以阿拉伯胶为原料生成一种含塔格糖的糖浆工艺优化

以阿拉伯胶为原料,研究以铝酸钠作为催化剂,合成一种含有D-塔格糖的功能性糖浆的合成工艺,探讨铝酸钠加入量、反应时间和反应温度3个单因素对塔格糖转化率的影响,并在单因素试验的基础上利用响应面分析法对塔格糖的合成工艺进行优化。结果表明,优化出的最佳工艺条件为:100mL含8.90g半乳糖的水解液中铝酸钠加入量4.93g,反应时间3.5h,反应温度45℃,该条件下,66.18%的半乳糖可转化为塔格糖,D-塔格糖的浓度达到58.9g/L。     

Green and gold kiwifruit peel ethanol extracts potentiate pentobarbital-induced sleep in mice via a GABAergic mechanism

Kiwifruit is one of the most popular fruits worldwide, and it has various biological properties, including antioxidant, anti-allergic, and cardiovascular protective effects. The peel of kiwifruit, which is a by-product of processing, is a good source of flavonoids; however, its bioactivity has not been widely investigated. In this study, we evaluated the hypnotic effects of green (GRPE, Actinidia deliciosa) and gold (GOPE, Actinidia chinensis) kiwifruit peel ethanol extracts and their solvent fractions, and the possible underlying mechanisms. Oral GRPE and GOPE administration (125–1000 mg/kg) produced a dose-dependent decrease in sleep latency and an increase in sleep duration in pentobarbital-treated mice. Among three different solvent fractions of GRPE and GOPE, ethyl acetate (EA) fractions had the greatest effect on sleep duration at 250 mg/kg. The total flavonoid contents of solvent fractions were proportional to sleep duration. Like diazepam (a GABA_A–benzodiazepine (BZD) receptor agonist), the hypnotic effects of GRPE, GOPE, and their EA fractions were fully inhibited by flumazenil (a GABA_A–BZD receptor antagonist). These results suggest that potentiation effects of GRPE and GOPE on pentobarbital-induced sleep in mice may be modulated by a GABAergic mechanism.     

十二烯基琥珀酸淀粉酯性质的研究

采用RVA快速粘度测定仪，研究了十二烯基琥珀酸淀粉酯(SSDS)糊的粘度性质。测定了糊的凝沉性质、糊的乳化性质、糊的冻融稳定性、并采用扫描电子显微镜对SSDS的微观结构进行了分析。结果显示：酯化后SSDS的颗粒形貌、糊粘度性质较原玉米淀粉糊有较显著变化、其抗凝沉性、乳化性都明显优于原玉米淀粉，而冻融稳定性比原玉米淀粉差。     

氧漂稳定剂CGAD的应用

非硅型氧漂稳定剂CGAD是含有聚羧酸、羟基和氨基等多种极性基团的高分子络合型化合物，能耐强碱和高温，适用于常规的双氧水漂白工艺、冷轧堆和碱氧一浴法。分析了氧漂稳定剂CGAD对双氧水稳定性能，并测定了纯棉卡其的氧漂大生产工艺。试验结果表明，氧漂稳定剂CGAD与硅酸钠同浴使用，织物手感柔软，白度纯正。     

关于低钠盐标准及检测

文章较全面的报道了国内低钠盐标准的质量状况,同时介绍了国外低钠盐标准的组成、质量指标和动态。重点介绍了新修订的低钠盐行业标准的特点,并详细叙述了有关低钠盐检测方法所进行的试验研究工作。