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环糊精手性氨基酸分离膜的制备及性能
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作者 伊倩倩 叶茜 +2 位作者 李进 吴汉彬 张明亮 《高分子材料科学与工程》 北大核心 2025年第3期20-32,共13页
手性化合物是自然界中广泛存在的一类特殊异构体,由于其物理化学性质相同,有效分离手性化合物仍然是一个巨大的挑战。文中采用浸没沉淀相转化法制备了环糊精/聚偏氟乙烯(PVDF)手性分离膜,考察了环糊精种类(α-CD,β-CD和γ-CD)、β-CD... 手性化合物是自然界中广泛存在的一类特殊异构体,由于其物理化学性质相同,有效分离手性化合物仍然是一个巨大的挑战。文中采用浸没沉淀相转化法制备了环糊精/聚偏氟乙烯(PVDF)手性分离膜,考察了环糊精种类(α-CD,β-CD和γ-CD)、β-CD负载量、铸膜液温度和凝固浴组分对所制备β-CD/PVDF手性分离膜性能的影响。采用X射线衍射仪和X射线光电子能谱仪对β-CD/PVDF手性分离膜进行了分析,结果显示β-CD成功负载在复合膜上。在β-CD负载量为8%、铸膜液温度为70℃、凝固浴中DMAc质量分数为2%的条件下制备的手性分离膜(C2)表现出最佳的综合性能。在优化条件下制备的β-CD/PVDF手性分离膜能够有效分离DL-苯丙氨酸、DL-谷氨酸和DL-甲硫氨酸,其中对DL-苯丙氨酸的分离效果最佳,在1 h内其分离效率(ee值)可持续在100%。 展开更多
关键词 环糊精 手性氨基酸 手性分离 DL-苯丙氨酸
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Menstrual Characteristics and the Risk of Spontaneous Abortion-9 PLADs,China,2013-2024
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作者 Tsomo Tenzin Yumei Wei +14 位作者 Yiyao Jin Jiaxin Li Xiaowei Wang Shenfengxiang Feng Xinyi Lyu Yuanyuan Xiong hanbin wu Jueming Lei Jihong Xu Yuan He Yuanyuan Wang Ya Zhang Hongguang Zhang Ying Yang Xu Ma 《China CDC weekly》 2026年第10期284-292,I0001-I0004,共13页
Summary What is already known about this topic?Menstrual irregularity is a hallmark clinical feature of polycystic ovary syndrome(PCOS),which is an established risk factor for spontaneous abortion.However,robust popul... Summary What is already known about this topic?Menstrual irregularity is a hallmark clinical feature of polycystic ovary syndrome(PCOS),which is an established risk factor for spontaneous abortion.However,robust population-level evidence directly linking specific patterns of menstrual irregularity to spontaneous abortion risk remains lacking,as prior studies have been limited by small sample sizes. 展开更多
关键词 spontaneous abortion population level evidence polycystic ovary syndrome menstrual irregularity menstrual characteristics polycystic ovary syndrome pcos which spontaneous abortionhoweverrobust
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Hematological Parameters in the First Trimester and the Risk of Gestational Diabetes Mellitus—Beijing,China,2017–2020 被引量:4
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作者 Xinyi Lyu Jiajing Jia +7 位作者 Haishan Yang Yuzhi Deng hanbin wu Shuo Wang Chuanyu Zhao Jueming Lei Xiaoxuan Zou Ying Yang 《China CDC weekly》 SCIE CSCD 2023年第9期194-200,I0008,共8页
Summary What is already known about this topic?Hematological parameters may indicate the presence of chronic low-grade inflammation and increasing viscosity,which are involved in the pathological processes of gestatio... Summary What is already known about this topic?Hematological parameters may indicate the presence of chronic low-grade inflammation and increasing viscosity,which are involved in the pathological processes of gestational diabetes mellitus(GDM).However,the association between several hematological parameters in early pregnancy and GDM has yet to be elucidated.What is added by this report?Hematological parameters in the first trimester,particularly red blood cell(RBC)count and systematic immune index,have a significant impact on GDM incidence.The neutrophils(NEU)count in the first trimester was particularly pronounced for GDM.The upward trend of RBC,white blood cell(WBC),and NEU counts was consistent across all GDM subtypes.What are the implications for public health practice?Early pregnancy hematological parameters are associated with the risk of GDM. 展开更多
关键词 PREGNANCY INFLAMMATION DIABETES
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Maternal Preconception Serum Alanine Aminotransferase Levels and Risk of Preterm Birth among Reproductive-Aged Women—China,2013-2017 被引量:1
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作者 Chuanyu Zhao Jiajing Jia +17 位作者 hanbin wu Qin Xu Xinyi Lyu Meiya Liu Xuan Hu Jueming Lei Yuzhi Deng Yuan He Yuanyuan Wang Zuoqi Peng Ya Zhang Hongguang Zhang Qiaomei Wang Haiping Shen Yiping Zhang Donghai Yan Ying Yang Xu Ma 《China CDC weekly》 SCIE CSCD 2024年第10期181-188,I0001,共9页
Summary What is already known about this topic?The significance of maternal liver health concerning preterm birth(PTB)is well recognized;however,there is a gap in understanding the precise influence of preconception s... Summary What is already known about this topic?The significance of maternal liver health concerning preterm birth(PTB)is well recognized;however,there is a gap in understanding the precise influence of preconception serum alanine aminotransferase(ALT)levels on the risk of PTB.What is added by this report? 展开更多
关键词 SERUM PRECISE concerning
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