目的探讨毛细管电泳分离神经递质类氨基酸的影响因素。方法采用毛细管电泳法分离4种神经递质类氨基酸的荧光素异硫氰酸酯(FITC-AAs)衍生物,分析电泳缓冲液、表面活性剂以及衍生条件对分离的影响。结果电泳缓冲液的组成、浓度、pH值、表...目的探讨毛细管电泳分离神经递质类氨基酸的影响因素。方法采用毛细管电泳法分离4种神经递质类氨基酸的荧光素异硫氰酸酯(FITC-AAs)衍生物,分析电泳缓冲液、表面活性剂以及衍生条件对分离的影响。结果电泳缓冲液的组成、浓度、pH值、表面活性剂以及衍生条件对4种FITC-AA衍生物分离有很大影响,在以75 mm ol/L,pH 9.42硼酸盐含100 mm ol/LSDS为电泳缓冲液,50 mmol/LpH 9.8硼酸盐为衍生缓冲液,4种FITC-AA衍生物20 min内得到很好分离。结论通过条件优化,毛细管电泳-激光诱导荧光技术分离神经递质类氨基酸的分离效果能得到很大提高。展开更多
In order to solve the problems of low accuracy and poor variety adaptability of the current measurement method of the permeability and coating property of sizing paste in textile industry, taking starch and polyvinyl ...In order to solve the problems of low accuracy and poor variety adaptability of the current measurement method of the permeability and coating property of sizing paste in textile industry, taking starch and polyvinyl alcohol(PVA) as the representatives of the most commonly used textile sizes, various concentrations of fluorescent molecules fluorescein isothiocyanate(FITC) were used to label starch and PVA to prepare fluorescein(F)-starch and F-PVA fluorescent sizes with different degrees of labeling(DLs) for the first time, respectively. Then the starch and PVA derivatives were employed to size pure cotton warp yarns. After preparing the sections of the sized yarns, the permeability and coating percentage of starch and PVA paste to the yarns were calculated by using a fluorescence microscope and the Photoshop software, respectively. The results demonstrate that F-starch and F-PVA with appropriate DL of 0.791% and 0.161%, respectively, exhibit good fluorescence property and similar sizing performance to the sizing performance of unlabeled starch and PVA. It is considered that fluorescence labeling of sizing agents with fluorescein units can provide an innovative way for the accurate determination of the permeability and coating property of sizing paste to warp yarns.展开更多
The global pandemic caused by severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)virus has necessitated rapid,easy-to-use,and accurate diagnostic methods to monitor the virus infection.Herein,a ratiometric flu...The global pandemic caused by severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)virus has necessitated rapid,easy-to-use,and accurate diagnostic methods to monitor the virus infection.Herein,a ratiometric fluorescence enzyme-linked immunosorbent assay(ELISA)was developed using Si-fluorescein isothiocyanate nanoparticles(FITC NPs)for detecting SARSCoV-2 nucleocapsid(N)protein.Si-FITC NPs were prepared by a one-pot hydrothermal method using 3-aminopropyl triethoxysilane(APTES)-FITC as the Si source.This method did not need post-modification and avoided the reduction in quantum yield and stability.The p-nitrophenyl(pNP)produced by the alkaline phosphatase(ALP)-mediated hydrolysis of pnitrophenyl phosphate(pNPP)could quench Si fluorescence in Si-FITC NPs via the inner filter effect.In ELISA,an immunocomplex was formed by the recognition of capture antibody/N protein/reporter antibody.ALP-linked secondary antibody bound to the reporter antibody and induced pNPP hydrolysis to specifically quench Si fluorescence in Si-FITC NPs.The change in fluorescence intensity ratio could be used for detecting N protein,with a wide linearity range(0.01-10.0 and 50-300 ng/mL)and low detection limit(0.002 ng/mL).The concentration of spiked SARS-CoV-2 N protein could be determined accurately in human serum.Moreover,this proposed method can accurately distinguish coronavirus disease 2019(COVID-19)and non-COVID-19 patient samples.Therefore,this simple,sensitive,and accurate method can be applied for the early diagnosis of SARS-CoV-2 virus infection.展开更多
文摘目的探讨毛细管电泳分离神经递质类氨基酸的影响因素。方法采用毛细管电泳法分离4种神经递质类氨基酸的荧光素异硫氰酸酯(FITC-AAs)衍生物,分析电泳缓冲液、表面活性剂以及衍生条件对分离的影响。结果电泳缓冲液的组成、浓度、pH值、表面活性剂以及衍生条件对4种FITC-AA衍生物分离有很大影响,在以75 mm ol/L,pH 9.42硼酸盐含100 mm ol/LSDS为电泳缓冲液,50 mmol/LpH 9.8硼酸盐为衍生缓冲液,4种FITC-AA衍生物20 min内得到很好分离。结论通过条件优化,毛细管电泳-激光诱导荧光技术分离神经递质类氨基酸的分离效果能得到很大提高。
基金National Natural Science Foundation of China(Nos.51573095 and 51873187)Project of Key Laboratory of Clean Dyeing and Finishing Technology of Zhejiang Province,China(No.QJRZ1902)+1 种基金Technological Research Project for Public Welfare of Zhejiang Province,China(No.LGG21E030005)Postdoctoral Research Program of Zhejiang Province in 2021,China。
文摘In order to solve the problems of low accuracy and poor variety adaptability of the current measurement method of the permeability and coating property of sizing paste in textile industry, taking starch and polyvinyl alcohol(PVA) as the representatives of the most commonly used textile sizes, various concentrations of fluorescent molecules fluorescein isothiocyanate(FITC) were used to label starch and PVA to prepare fluorescein(F)-starch and F-PVA fluorescent sizes with different degrees of labeling(DLs) for the first time, respectively. Then the starch and PVA derivatives were employed to size pure cotton warp yarns. After preparing the sections of the sized yarns, the permeability and coating percentage of starch and PVA paste to the yarns were calculated by using a fluorescence microscope and the Photoshop software, respectively. The results demonstrate that F-starch and F-PVA with appropriate DL of 0.791% and 0.161%, respectively, exhibit good fluorescence property and similar sizing performance to the sizing performance of unlabeled starch and PVA. It is considered that fluorescence labeling of sizing agents with fluorescein units can provide an innovative way for the accurate determination of the permeability and coating property of sizing paste to warp yarns.
基金supported by the National Key Research and Development Program of China(No.2021YFA0910900)the National Natural Science Foundation(No.22104147)+4 种基金Youth Innovation Promotion Association CAS(No.2021359)the Natural Science Foundation of Guangdong(Nos.2018B030306046 and 2020A1515111130)Guangdong Provincial Key Laboratory of Synthetic Genomics(No.2019B030301006)Shenzhen Science and Technology Program(No.KQTD20180413181837372)Shenzhen Outstanding Talents Training Fund.
文摘The global pandemic caused by severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)virus has necessitated rapid,easy-to-use,and accurate diagnostic methods to monitor the virus infection.Herein,a ratiometric fluorescence enzyme-linked immunosorbent assay(ELISA)was developed using Si-fluorescein isothiocyanate nanoparticles(FITC NPs)for detecting SARSCoV-2 nucleocapsid(N)protein.Si-FITC NPs were prepared by a one-pot hydrothermal method using 3-aminopropyl triethoxysilane(APTES)-FITC as the Si source.This method did not need post-modification and avoided the reduction in quantum yield and stability.The p-nitrophenyl(pNP)produced by the alkaline phosphatase(ALP)-mediated hydrolysis of pnitrophenyl phosphate(pNPP)could quench Si fluorescence in Si-FITC NPs via the inner filter effect.In ELISA,an immunocomplex was formed by the recognition of capture antibody/N protein/reporter antibody.ALP-linked secondary antibody bound to the reporter antibody and induced pNPP hydrolysis to specifically quench Si fluorescence in Si-FITC NPs.The change in fluorescence intensity ratio could be used for detecting N protein,with a wide linearity range(0.01-10.0 and 50-300 ng/mL)and low detection limit(0.002 ng/mL).The concentration of spiked SARS-CoV-2 N protein could be determined accurately in human serum.Moreover,this proposed method can accurately distinguish coronavirus disease 2019(COVID-19)and non-COVID-19 patient samples.Therefore,this simple,sensitive,and accurate method can be applied for the early diagnosis of SARS-CoV-2 virus infection.
