氮-磷-铝阻燃剂的制备及其在皮革中的阻燃性能

采用分子设计方法制备了氮-磷-铝协同阻燃材料,并作为填料,通过阻燃赋性工艺引入皮胶原纤维之间,得到阻燃性能优良的阻燃功能皮革,并通过FTIR、^(1)H NMR、SEM、XPS、TG和DTG进行了表征。FTIR和^(1)H NMR表明已引入了目标结构,SEM、EDS和XPS表明阻燃填料已引入到皮革的胶原纤维束之间;TG和DTG表明,阻燃填料的添加量越大,皮革的热分解温度越高,残留率也越大;阻燃测试结果表明,引入氮-磷-铝阻燃剂后,皮革具有较好的阻燃性,不燃烧,离开火焰后极易熄灭,不续燃;燃烧距离几乎为零,基本无质量损失,阻燃等级可达到UL 94 V-0,极限氧指数可达到354%。

基于均匀设计的无铬复鞣工艺设计与优化

为提高皮革复鞣工艺的生态性能,以锆-铝-钛鞣白湿革为原料皮,以皮革的热收缩温度、撕裂强度、感官性能和复鞣排放废液中的COD含量作为评价指标,设计并优化基于改性戊二醛、锆铝钛配合鞣剂和阳离子油的无铬复鞣工艺。结果表明,当改性戊二醛鞣剂用量为2%、锆-铝-钛配合鞣剂用量为2%、阳离子油用量为0.4%时,复鞣效果和生态性能好,复鞣后的坯革也具有较好的耐热性能、感官性能和物理性能。这为皮革的生态设计提供了一种新思路。

Discovery of proqodine A derivatives with antitumor activity targeting NAD(P)H:quinone oxidoreductase 1 and nicotinamide phosphoribosyltransferase

NAD(P)H:quinone oxidoreductase 1(NQO1)is a flavin protease highly expressed in various cancer cells.NQO1 catalyzes a futile redox cycle in substrates,leading to substantial reactive oxygen species(ROS)production.This ROS generation results in extensive DNA damage and elevated poly(ADP-ribose)polymerase 1(PARP1)-mediated consumption of nicotinamide adenine dinucleotide(NAD^(+)),ultimately causing cell death.Nicotinamide phosphoribosyltransferase(NAMPT),the rate-limiting enzyme in the NAD^(+)salvage synthesis pathway,emerges as a critical target in cancer therapy.The concurrent inhibition of NQO1 and NAMPT triggers hyperactivation of PARP1 and intensive NAD+depletion.In this study,we designed,synthesized,and assessed a novel series of proqodine A derivatives targeting both NQO1 and NAMPT.Among these,compound T8 demonstrated potent antitumor properties.Specifically,T8 selectively inhibited the proliferation of MCF-7 cells and induced apoptosis through mechanisms dependent on both NQO1 and NAMPT.This discovery offers a promising new molecular entity for advancing anticancer research.

Dual-function natural products: Farnesoid X receptor agonist/inflammation inhibitor for metabolic dysfunction-associated steatotic liverdiseasetherapy

Metabolic dysfunction-associated steatotic liver disease(MASLD)is the most prevalent chronic liver disease globally,with only one Food and Drug Administration(FDA)-approved drug for its treatment.Given MASLD's complex pathophysiology,ther-apies that simultaneously target multiple pathways are highly desirable.One promising approach is dual-modulation of the famesoid X receptor(FXR),which regulates lipid and bile acid metabolism.However,FXR agonists alone are insufficient due to their limited anti-inflammatory effects.This study aimed to dto identify natural products capable of both FXR activation and inflammation inhibition to provide a comprehensive therapeutic approach for MASLD.Potential FXR ligands from the Natural Product Library were predicted via virtual screening using the Protein Preparation Wizard module in Schrodinger(2018)for molecular docking.Direct binding and regulation of candidate compounds on FXR were analyzed using surface plasmon resonance(SPR)binding assay,reporter gene ana-lysis,and reverse transcription-polymerase chain reaction(RT-PCR).The anti-inflammatory properties of these compounds were eval-uated in AML12 cells treated with tumor necrosis factor-alpha(TNF-α).Dual-function compounds with FXR agonism and inflamma-tion inhibition were further identified in cells transfected with Fxr siRNA and treated with TNF-α.The effects of these dual-function compounds on lipid accumulation and inflammation were evaluated in cells treated with palmitic acid.Results revealed that 17 natural products were predicted via computational molecular docking as potential FXR agonists,with 15 exhibiting a strong affinity for FXR recombinant protein.Nine isoflavone compounds significantly enhanced FXR reporter luciferase activity and the mRNA expressions of Shp and Ostb.Structure-activity relationship analysis indicated that introducing isopropyl or methoxy groups at the C7 position or a methoxy group at the C6 position could enhance the agonistic efficacy of isoflavones.Three compounds(2,6,and 8)were identified as dual-function natural products functioning as FXR agonists and inflammatory inhibitors,while one compound(12)acted as an FXR agonist to inhibit inflammation.These natural products protected hepatocytes against palmitic acid-induced lipid accumulation and in-flammation.In conclusion,compounds 2,6,and 8(genistein,biochanin A,and 7-methoxyisoflavone,respectively)were identified as dual-function bioactive products that transactivate FXR and inhibit inflammation,serving as potential candidates or lead compounds for MASLD therapy.

制革工业铬污染及其防治技术现状

铬污染问题长久以来一直制约着制革工业的发展,是制革工业可持续健康发展所必须克服的障碍。本文简述了制革工业铬污染的危害、来源及管控现状,并从源头减排、末端治理及资源化利用三个方面,简要总结了制革工业铬污染的防治技术研究现状。制革行业产生的铬污染物不仅需要得到有效治理,更应该从生产源头采用能使铬有效减排的制革清洁生产技术进行防治,并积极推动制革铬污染物的资源化利用。