The platinum (II) complexes of the [Pt (N4,N7-Ribavirin) (DMSO) Cl], [Pt (N4,N7-De-oxyribavirin) (DMSO) Cl] were obtained by the reactions of cis-[Pt (DMSO)2 Cl2] and K[Pt (DMSO) Cl3] with 1-??-D-ribofuranosyl-1,2,4-t...The platinum (II) complexes of the [Pt (N4,N7-Ribavirin) (DMSO) Cl], [Pt (N4,N7-De-oxyribavirin) (DMSO) Cl] were obtained by the reactions of cis-[Pt (DMSO)2 Cl2] and K[Pt (DMSO) Cl3] with 1-??-D-ribofuranosyl-1,2,4-triazole-3-carboxamide (Ribavirin) and its deoxy-analogue (deoxyribavirin). The preparation of 1-(2'-deoxy-?-D-ribofuranosyl) -1,2,4-triazole-3-carboxamide was also performed through a four-step procedure, protection of 3', 5'-dihydroxyl group of Ribavirin with 1,3-dichloro-1,1,3,3-tetraisopropyldisiloxane (TPDS-Cl), phenoxythio-carbonylation of the 2'-hydroxyl group of 3', 5'-O-TPDS-Ribavirin with phenoxythiocarbonyl-chloride (PTC-Cl), reduction of 2′-O-phenoxythiocarbonyl ester of 3', 5'-O-TPDS-Ribavirin with tri-n-butyltin hydride and AIBN, deprotection of 3', 5'-O-TPDS-Ribavirin with tetrabutylammon-ium fluoride in THF.展开更多
An electroanalytical method for the determination of ammonium ion using a platinized platinum electrode is described.Under optimized analytical conditions,the linear range of the calibration graphs for ammonium ion is...An electroanalytical method for the determination of ammonium ion using a platinized platinum electrode is described.Under optimized analytical conditions,the linear range of the calibration graphs for ammonium ion is 3.0×10^(-5)-5.0×10^(-3)mol·L^(-1)with a detection limit of 5.0×10^(-6)mol·L^(-1).The method has been applied to the determination of ammonium ion in lake water samples and recoveries of 100%–103%are obtained.The results obtained are found to be in good agreement with spectrophotometric results.展开更多
Proteolysis targeting chimeras(PROTACs),which catalytically degrade disease-related proteins,can overcome the limitations of traditional small-molecule inhibitors and thus have revolutionized the field of targeted the...Proteolysis targeting chimeras(PROTACs),which catalytically degrade disease-related proteins,can overcome the limitations of traditional small-molecule inhibitors and thus have revolutionized the field of targeted therapy.Building on this advancement,we present platinated PROTAC[PROTAC-Pt(Ⅳ)],a new class of“dual-action”prodrug that leverages the ubiquitin-proteasome system-mediated degradation capabilities of PROTAC and exhibits the advantages of Pt-based anticancer prodrugs.PROTAC-Pt(Ⅳ)exhibits exceptional cytotoxicity,with half-maximal inhibitory concentration values in the nanomolar range.It outperformed conventional inhibitor-based Pt(Ⅳ)prodrugs by up to three orders of magnitude by efficiently degrading the target protein BRD4 in a range of human cancer cells.PROTAC-Pt(Ⅳ)induces cancer cell death through mechanisms including augmented apoptosis,p21-mediated cell cycle arrest,and immune activation via PD-L1 downregulation.Compared with PROTAC alone,PROTAC-Pt(Ⅳ)more effectively suppressed the growth of tumor xenografts in a mouse model via its altered pharmacokinetic properties.Collectively,the development of PROTAC-Pt(Ⅳ)marks a revolution in dual-action Pt(Ⅳ)anticancer prodrugs and offers a promising avenue for enhanced and targeted cancer therapies.展开更多
The selection and preparation of electrocatalysts of high performance is one of the most important subjects in the applied researches of electrocatalysis. The common method to obtain electrocatalysts of high performan...The selection and preparation of electrocatalysts of high performance is one of the most important subjects in the applied researches of electrocatalysis. The common method to obtain electrocatalysts of high performance and low cost is to disperse catalytic materials on supports of carbon or oxides. It is well known that platinum exhibits the best electrocatalytic activity compared with other metals, for which the preparation展开更多
我对Platin(铂庭)的产品并不陌生,印象里这个来自丹麦的音箱品牌,旗下产品都有着精致亮丽的外表。正因为见多了非黑即白的音箱,让我每次见到Platin音箱产品都会产生眼前一亮的惊喜。不过这次来到杂志社的产品不再以音箱为主角,而是另一...我对Platin(铂庭)的产品并不陌生,印象里这个来自丹麦的音箱品牌,旗下产品都有着精致亮丽的外表。正因为见多了非黑即白的音箱,让我每次见到Platin音箱产品都会产生眼前一亮的惊喜。不过这次来到杂志社的产品不再以音箱为主角,而是另一款无线多输入音源发射器Platin Pro AirHub(以下简称:AirHub)。Platin Pro是Platin的一条全新产品线,它的定位是专业化、商业级,旨在为客户提供多种解决方案,以技术改善聆听体验。Air Hub是其最新推出的一款商用/家用无线发射器,专为由于不可抗因素而无法实现布线的餐饮店、酒店、舞台等商业场所,提供无线音频传输解决方案。展开更多
文摘The platinum (II) complexes of the [Pt (N4,N7-Ribavirin) (DMSO) Cl], [Pt (N4,N7-De-oxyribavirin) (DMSO) Cl] were obtained by the reactions of cis-[Pt (DMSO)2 Cl2] and K[Pt (DMSO) Cl3] with 1-??-D-ribofuranosyl-1,2,4-triazole-3-carboxamide (Ribavirin) and its deoxy-analogue (deoxyribavirin). The preparation of 1-(2'-deoxy-?-D-ribofuranosyl) -1,2,4-triazole-3-carboxamide was also performed through a four-step procedure, protection of 3', 5'-dihydroxyl group of Ribavirin with 1,3-dichloro-1,1,3,3-tetraisopropyldisiloxane (TPDS-Cl), phenoxythio-carbonylation of the 2'-hydroxyl group of 3', 5'-O-TPDS-Ribavirin with phenoxythiocarbonyl-chloride (PTC-Cl), reduction of 2′-O-phenoxythiocarbonyl ester of 3', 5'-O-TPDS-Ribavirin with tri-n-butyltin hydride and AIBN, deprotection of 3', 5'-O-TPDS-Ribavirin with tetrabutylammon-ium fluoride in THF.
基金Supported by the National Natural Science Foundation of China(60171023)
文摘An electroanalytical method for the determination of ammonium ion using a platinized platinum electrode is described.Under optimized analytical conditions,the linear range of the calibration graphs for ammonium ion is 3.0×10^(-5)-5.0×10^(-3)mol·L^(-1)with a detection limit of 5.0×10^(-6)mol·L^(-1).The method has been applied to the determination of ammonium ion in lake water samples and recoveries of 100%–103%are obtained.The results obtained are found to be in good agreement with spectrophotometric results.
基金the Hong Kong Research Grants Council(Grant No.CityU 11303320,CityU 11302221,CityU 11313222,CityU 11304923,and C1018-23G)the National Natural Science Foundation of China(Grant No.22077108 and 22277103)+1 种基金the Science Technology and Innovation Committee of Shenzhen Municipality(JCYJ20210324120004011)the City University of Hong Kong(Grant No.7020014)for funding support.
文摘Proteolysis targeting chimeras(PROTACs),which catalytically degrade disease-related proteins,can overcome the limitations of traditional small-molecule inhibitors and thus have revolutionized the field of targeted therapy.Building on this advancement,we present platinated PROTAC[PROTAC-Pt(Ⅳ)],a new class of“dual-action”prodrug that leverages the ubiquitin-proteasome system-mediated degradation capabilities of PROTAC and exhibits the advantages of Pt-based anticancer prodrugs.PROTAC-Pt(Ⅳ)exhibits exceptional cytotoxicity,with half-maximal inhibitory concentration values in the nanomolar range.It outperformed conventional inhibitor-based Pt(Ⅳ)prodrugs by up to three orders of magnitude by efficiently degrading the target protein BRD4 in a range of human cancer cells.PROTAC-Pt(Ⅳ)induces cancer cell death through mechanisms including augmented apoptosis,p21-mediated cell cycle arrest,and immune activation via PD-L1 downregulation.Compared with PROTAC alone,PROTAC-Pt(Ⅳ)more effectively suppressed the growth of tumor xenografts in a mouse model via its altered pharmacokinetic properties.Collectively,the development of PROTAC-Pt(Ⅳ)marks a revolution in dual-action Pt(Ⅳ)anticancer prodrugs and offers a promising avenue for enhanced and targeted cancer therapies.
文摘The selection and preparation of electrocatalysts of high performance is one of the most important subjects in the applied researches of electrocatalysis. The common method to obtain electrocatalysts of high performance and low cost is to disperse catalytic materials on supports of carbon or oxides. It is well known that platinum exhibits the best electrocatalytic activity compared with other metals, for which the preparation
文摘我对Platin(铂庭)的产品并不陌生,印象里这个来自丹麦的音箱品牌,旗下产品都有着精致亮丽的外表。正因为见多了非黑即白的音箱,让我每次见到Platin音箱产品都会产生眼前一亮的惊喜。不过这次来到杂志社的产品不再以音箱为主角,而是另一款无线多输入音源发射器Platin Pro AirHub(以下简称:AirHub)。Platin Pro是Platin的一条全新产品线,它的定位是专业化、商业级,旨在为客户提供多种解决方案,以技术改善聆听体验。Air Hub是其最新推出的一款商用/家用无线发射器,专为由于不可抗因素而无法实现布线的餐饮店、酒店、舞台等商业场所,提供无线音频传输解决方案。
