Background:Accurate quantification of 17-hydroxyprogesterone(17-OHP)in serum is vital for clinical and research applications.However,inter-laboratory variability in test results exists owing to the lack of a standardi...Background:Accurate quantification of 17-hydroxyprogesterone(17-OHP)in serum is vital for clinical and research applications.However,inter-laboratory variability in test results exists owing to the lack of a standardized reference measurement procedure(RMP).Therefore,in this study,we developed a highly accurate,cost-effective,and user-friendly candidate RMP(cRMP)for analyzing 17-OHP in serum.Methods:We quantified 17-OHP in serum using a one-step liquid–liquid extraction method with the addition of 17-OHP-^(13)C_(3),followed by liquid chromatography–tandem mass spectrometry.The ability of these methods to suppress interference was evaluated by chromatographic analysis.We assessed accuracy,specificity,the lower limit of quantitation,linearity,and matrix effects by following the standards specified by the Clinical and Laboratory Standards Institute.The consistency between the developed cRMP and the chemiluminescence method was evaluated through experiments with 120 clinical samples.Results:The developed cRMP required only 8 min for accurate quantification of serum 17-OHP without bias from matrix effects or interference from 19 metabolites added as potential interferents.The method exhibited favorable measurement performance,with a quantitation limit of 0.086 ng/mL,linear range of 0.1–400 ng/mL,a total imprecision of≤2.90%,spike recovery of 100.1%–100.6%,and relative deviations from assigned target values(RfB Institution)of−2.91%to 1.10%.The cRMP demonstrated good consistency with the conventional assay(chemiluminescence method),with a correlation coefficient R of 0.96977.Conclusion:A cRMP with high accuracy,cost-effectiveness,and convenient operation was developed for quantifying 17-OHP in serum.Its simplicity and robust performance make it an invaluable addition to the arsenal of analytical tools available for laboratories.This method can enhance the accuracy and reliability of 17-OHP measurements across various laboratories.展开更多
目的建立同位素稀释液相色谱串联质谱(isotope dilution chromatography tandem mass spectrometry,ID-LC/MS)测定人血清同型半胱氨酸(Hcy)参考方法,并运用于临床实验室室间质评(external quality assessment,EQA)样本靶值的确立。方法...目的建立同位素稀释液相色谱串联质谱(isotope dilution chromatography tandem mass spectrometry,ID-LC/MS)测定人血清同型半胱氨酸(Hcy)参考方法,并运用于临床实验室室间质评(external quality assessment,EQA)样本靶值的确立。方法参照国际检验医学溯源联合委员会(the Joint Committee for Traceability in Laboratory Medicine,JCTLM)推荐方法,建立本实验室Hcy参考方法,并对所建方法的精密度、正确度、特异性、残留、基质效应等进行评估,并将建立的参考方法用于上海地区2018年度第二次EQA样本Hcy靶值的确立。结果该方法3 d 3批次检测12.5μmol/L和37.4μmol/L样本,批间CV分别为1.03%和2.10%,精密度较好;检测美国国家标准和技术研究院(National Institute of Standards and Technology,NIST)标准参考物质(standard reference material,SRM)1955均在规定的不确定度范围内;无基质效应和携带污染。2018年第二次EQA数据显示国产试剂组均值低于参考方法赋值结果,进口试剂组均值高于参考方法赋值结果。结论建立的ID-LC/MS/MS测定血清Hcy参考方法精密度、正确度、特异性均较好,无分析物残留,有望在临床实验室Hcy测定的量值溯源中发挥一定作用。展开更多
In this paper,the sequence distribution in the copolyester made from polyethyleneterephthalate （PET） and p-hydroxybenzoic acid （PHB） at 290℃has been investigated by 400MHz <sup>1</sup>H-NMR.It has bee...In this paper,the sequence distribution in the copolyester made from polyethyleneterephthalate （PET） and p-hydroxybenzoic acid （PHB） at 290℃has been investigated by 400MHz <sup>1</sup>H-NMR.It has been found that reference factor m of PET/PHB copo!yester linearly de-creases when PHB molar fraction increases.In addition,a series of sequence structure parameters,such as PET,PHB segment mean length,randomness,etc.are calculated from a probability modelby m,X<sub>PHB</sub>%.This copolyester made at 290℃ is found to be nearer to that of completely randomcopolymer compared with that of the eopolyester made at 270℃,as in the case of the generalcopolycondensation.PHB-rich phase is formed only when PHB per number≥4,basing on thisconclusion,we establish the relationship between theoretical contents of PHB-rich phaseW<sub>PHB</sub>% and PHB contents X<sub>PHB</sub>% :W<sub>PHB</sub>%=104.0X<sub>PHB</sub><sup>4.40</sup> The minimum PHB-rich phase con-tent forming liquid crystal phase is 1.1% wt.展开更多
Testosterone(T)plays a crucial role in spermatogenesis because extremely low levels of intratesticular T lead to correspondingly low serum levels of total T(tT),severe disorders of spermatogenesis,and male sterility.H...Testosterone(T)plays a crucial role in spermatogenesis because extremely low levels of intratesticular T lead to correspondingly low serum levels of total T(tT),severe disorders of spermatogenesis,and male sterility.However,there is little consensus on the lower limits of serum tT in proven fertile men undergoing assisted reproductive technology treatments in Chinese or other Asian populations.We aimed to establish the reference range of serum tT based on a population of 868 fertile Chinese men undergoing in vitro fertilization or intracytoplasmic sperm injection and embryo transfer(IVF/ICSI-ET)treatments.We defined a fertile man as having had a live baby with his partner as recorded in our IVF registration system.The lower limits of serum tT were established using a Siemens IMMULITE 2000 chemiluminescent system.The 1st,2.5th,and 5th percentiles and their 95%confidence intervals(CIs)were 3.6(95%CI:2.7–4.1)nmol l−1,4.3(95%CI:4.1–5.0)nmol l−1,and 5.6(95%CI:4.8–5.8)nmol l−1,respectively.Using the linear correlation of serum tT between the Siemens platform and a liquid chromatography–tandem mass spectrometry platform,the calculated lower limits of serum tT were also established for fertile Chinese men undergoing IVF/ICSI-ET treatments,which will benefit the clinical diagnosis and treatment of male infertility during such procedures.展开更多
基金Science and Technology Project of Dongguan,Grant/Award Number:20211800905072Graduate Education Innovation Program Project of Guangdong Province,Grant/Award Number:2022KCXTD010+6 种基金Discipline Construction Project of Guangdong Medical University,Grant/Award Numbers:4SG22098G,4SG22259G,4SG23030G,4SG23143GNational Natural Science Foundation of China,Grant/Award Numbers:81870016,82270013Guangdong Basic and Applied Basic Research Foundation,Grant/Award Number:2022A1515010525Guangdong Medical UniversityShenzhen YHLO Biotech Co.,Ltd.Huazhong University of Science and TechnologyShenzhen Maternal and Child Health Care Hospital。
文摘Background:Accurate quantification of 17-hydroxyprogesterone(17-OHP)in serum is vital for clinical and research applications.However,inter-laboratory variability in test results exists owing to the lack of a standardized reference measurement procedure(RMP).Therefore,in this study,we developed a highly accurate,cost-effective,and user-friendly candidate RMP(cRMP)for analyzing 17-OHP in serum.Methods:We quantified 17-OHP in serum using a one-step liquid–liquid extraction method with the addition of 17-OHP-^(13)C_(3),followed by liquid chromatography–tandem mass spectrometry.The ability of these methods to suppress interference was evaluated by chromatographic analysis.We assessed accuracy,specificity,the lower limit of quantitation,linearity,and matrix effects by following the standards specified by the Clinical and Laboratory Standards Institute.The consistency between the developed cRMP and the chemiluminescence method was evaluated through experiments with 120 clinical samples.Results:The developed cRMP required only 8 min for accurate quantification of serum 17-OHP without bias from matrix effects or interference from 19 metabolites added as potential interferents.The method exhibited favorable measurement performance,with a quantitation limit of 0.086 ng/mL,linear range of 0.1–400 ng/mL,a total imprecision of≤2.90%,spike recovery of 100.1%–100.6%,and relative deviations from assigned target values(RfB Institution)of−2.91%to 1.10%.The cRMP demonstrated good consistency with the conventional assay(chemiluminescence method),with a correlation coefficient R of 0.96977.Conclusion:A cRMP with high accuracy,cost-effectiveness,and convenient operation was developed for quantifying 17-OHP in serum.Its simplicity and robust performance make it an invaluable addition to the arsenal of analytical tools available for laboratories.This method can enhance the accuracy and reliability of 17-OHP measurements across various laboratories.
文摘目的建立同位素稀释液相色谱串联质谱(isotope dilution chromatography tandem mass spectrometry,ID-LC/MS)测定人血清同型半胱氨酸(Hcy)参考方法,并运用于临床实验室室间质评(external quality assessment,EQA)样本靶值的确立。方法参照国际检验医学溯源联合委员会(the Joint Committee for Traceability in Laboratory Medicine,JCTLM)推荐方法,建立本实验室Hcy参考方法,并对所建方法的精密度、正确度、特异性、残留、基质效应等进行评估,并将建立的参考方法用于上海地区2018年度第二次EQA样本Hcy靶值的确立。结果该方法3 d 3批次检测12.5μmol/L和37.4μmol/L样本,批间CV分别为1.03%和2.10%,精密度较好;检测美国国家标准和技术研究院(National Institute of Standards and Technology,NIST)标准参考物质(standard reference material,SRM)1955均在规定的不确定度范围内;无基质效应和携带污染。2018年第二次EQA数据显示国产试剂组均值低于参考方法赋值结果,进口试剂组均值高于参考方法赋值结果。结论建立的ID-LC/MS/MS测定血清Hcy参考方法精密度、正确度、特异性均较好,无分析物残留,有望在临床实验室Hcy测定的量值溯源中发挥一定作用。
文摘In this paper,the sequence distribution in the copolyester made from polyethyleneterephthalate （PET） and p-hydroxybenzoic acid （PHB） at 290℃has been investigated by 400MHz <sup>1</sup>H-NMR.It has been found that reference factor m of PET/PHB copo!yester linearly de-creases when PHB molar fraction increases.In addition,a series of sequence structure parameters,such as PET,PHB segment mean length,randomness,etc.are calculated from a probability modelby m,X<sub>PHB</sub>%.This copolyester made at 290℃ is found to be nearer to that of completely randomcopolymer compared with that of the eopolyester made at 270℃,as in the case of the generalcopolycondensation.PHB-rich phase is formed only when PHB per number≥4,basing on thisconclusion,we establish the relationship between theoretical contents of PHB-rich phaseW<sub>PHB</sub>% and PHB contents X<sub>PHB</sub>% :W<sub>PHB</sub>%=104.0X<sub>PHB</sub><sup>4.40</sup> The minimum PHB-rich phase con-tent forming liquid crystal phase is 1.1% wt.
基金the National Key Research and Development Program of China(No.2016YFC1000201,No.2018YFC1002104,No.2018YFC1002106,and No.2016YFC1000302)the National Natural Science Foundation of China(No.81300373,and No.81771650)+2 种基金the Capital Health Research and Development of Special Projects(No.2018-1-4091)the Program for Innovative Research Team of Yunnan,China(No.2017HC009)the Major National R&D Projects of China(No.2017ZX09304012-012).
文摘Testosterone(T)plays a crucial role in spermatogenesis because extremely low levels of intratesticular T lead to correspondingly low serum levels of total T(tT),severe disorders of spermatogenesis,and male sterility.However,there is little consensus on the lower limits of serum tT in proven fertile men undergoing assisted reproductive technology treatments in Chinese or other Asian populations.We aimed to establish the reference range of serum tT based on a population of 868 fertile Chinese men undergoing in vitro fertilization or intracytoplasmic sperm injection and embryo transfer(IVF/ICSI-ET)treatments.We defined a fertile man as having had a live baby with his partner as recorded in our IVF registration system.The lower limits of serum tT were established using a Siemens IMMULITE 2000 chemiluminescent system.The 1st,2.5th,and 5th percentiles and their 95%confidence intervals(CIs)were 3.6(95%CI:2.7–4.1)nmol l−1,4.3(95%CI:4.1–5.0)nmol l−1,and 5.6(95%CI:4.8–5.8)nmol l−1,respectively.Using the linear correlation of serum tT between the Siemens platform and a liquid chromatography–tandem mass spectrometry platform,the calculated lower limits of serum tT were also established for fertile Chinese men undergoing IVF/ICSI-ET treatments,which will benefit the clinical diagnosis and treatment of male infertility during such procedures.
