RP-HPLC 法测定酸枣仁汤中甘草苷的含量

目的:建立测定酸枣仁汤中甘草苷含量的反相高效液相色谱分析方法。方法:色谱柱:WatersC18(250nm×4.6mm,5μm);流动相:乙腈-0.1%磷酸水溶液,梯度洗脱;流速:1.0ml/min,检测波长:276nm。结果:芒果苷在0.093μg-0.744μg范围内与峰面积线性关系良好(r=0.9999),平均加样回收率为98.04%,RSD为0.41%。结论:本方法简便、准确、可靠、重复性好,可作为酸枣仁汤中甘草苷的含量测定方法。     

RP-HPLC法测定酸枣仁汤中芒果苷的含量

目的：建立测定酸枣仁汤中芒果苷含量的反高效液相色谱分析方法。方法：色谱柱：WatersC18（250nm×4.6mm,5μm）;流动相：乙腈-0.1%磷酸水溶液,梯度洗脱;流速：1.0ml/min,检测波长：257nm。结果：芒果苷在0.316μg-1.264μg范围内与峰面积线性关系良好（r=0.9999）,平均加样回收率为97.64%,RSD为0.36%。结论：本方法简便、准确、可靠、重复性好,可作为酸枣仁汤中芒果苷的含量测定方法。     

RP-HPLC法测定酸枣仁汤中甘草苷的含量

目的：建立测定酸枣仁汤中甘草苷含量的反相高效液相色谱分析方法。方法：色谱柱：WatersC18（250nm×4．6mm,5wm）;流动相：乙腈一0．1％磷酸水溶液,梯度洗脱;流速：1．0ml／min,检测波长：276nm。结果：芒果苷在0．093μg·0．744μg范围内与峰面积线性关系良好（r==0．9999）,平均加样回收率为98．04％,RSD为0．41％。结论：本方法简便、准确、可靠、重复性好,可作为酸枣仁汤中甘草苷的含量测定方法。     

HPLC法测定酸枣仁颗粒中斯皮诺素的含量

目的:建立测定酸枣仁颗粒中斯皮诺素含量的高效液相色谱方法。方法:采用Agilent C18柱(4.6×250mm 5μm),乙腈-水(20:80)为流动相洗脱,流速为1.0mL/min,检测波长为335nm。结果:斯皮诺素在0.252μg~2.518μg范围内线性关系良好,平均回收率符合含量测定要求。结论:本法简单易行,结果准确可靠,可有效地用于酸枣仁颗粒的质量控制。     

HPLC 法测定不同来源槐角中槐角苷含量

目的:建立HPLC法测定槐角中槐角苷含量测定方法并检测不同来源槐角中槐角苷的含量。方法:Luna 5u C18(2)100A柱(250 mm×4.60 mm,5μm),柱温为35℃,流动相为甲醇-乙腈-1%冰醋酸(40:5:55),流速为1.0 ml/min,检测波长为260 nm。结果:槐角苷质量浓度在14.58 mg/L～53.46 mg/L范围内呈良好的线性关系,回归方程为y=110353x-274717(r=0.9999),平均回收率为99.5%,RSD为1.27%;不同来源槐角中槐角苷含量范围4.27%～8.78%。结论:该方法简便、快速、灵敏、可靠;不同来源的槐角中槐角苷含量有较大差异,其中以陕北黄土高原品种含量最高,可为槐角的质量保证提供依据。     

HPLC法测定利鼻片中黄芩苷的含量

目的:采用HPLC法测定利鼻片中黄芩苷的含量。方法:色谱柱:Agilent C18(5μm,250×4.6mm);流动相:甲醇-水-磷酸(43:57:0.2);检测波长:280nm。结果:黄芩苷在0.13~4.16μg范围内呈良好的线性关系(r=0.9999997),平均回收率为100.44%,RSD=1.49%。结论:采用本法测定利鼻片中黄芩苷的含量,操作简便,准确可靠,可用于该药品的质量控制指标之一。     

黄芪桂枝五物颗粒中芍药苷的含量测定

目的:建立一个稳定可靠分离度好的方法测定黄芪桂枝五物颗粒中芍药苷的含量。方法:采用高效液相色谱法,色谱柱:YMC-Pack ODS-A(250×4.6mm,5μ);流动相:以乙腈—0.1%磷酸溶液(14:86)为流动相;检测波长:230nm;流速为1.0ml/min;柱温为30℃。结果:芍药苷的进样量在0.120μg~1.200μg范围内有良好的线性关系,平均回收率为99.22%,RSD为0.89%。建立了高效液相色谱法测定黄芪桂枝五物颗粒的含量的方法,该方法准确、可靠、分离度好。     

高效液相色谱法测定降糖1号胶囊中淫羊藿苷的含量

目的:建立测定降糖1号胶囊中淫羊藿苷含量的方法。方法:室温条件下超声提取降糖1号胶囊中的淫羊藿苷,用D101大孔吸附树脂柱纯化提取物,高效液相色谱法(HPLC)测定含量,色谱柱:Hypersil ODS2(4.6mm×200mm,5μm);流动相:乙腈-水(30:70);流速:1ml/min,检测波长270nm;柱温:30℃。结果:淫羊藿苷的进样量在0.08μg-0.28μg范围内线性关系良好(r=0.9999),平均加样回收率(n=6)为96.66%,RSD为2.14%。结论:该方法简便、准确、重复性好,可用于降糖1号胶囊的质量控制。     

HPLC法测定罗汉果中罗汉果苷ⅡE、苷Ⅲ的含量

采用ZORBAX SB-C18(4.6 mm×150 mm,5μm)色谱柱,以乙腈-水(25:75)为流动相,流速1 mL/min,柱温25℃,二极管阵列检测器,检测波长为203 nm,以外标法测定了罗汉果中罗汉果苷ⅡE、苷Ⅲ的含量。罗汉果苷ⅡE在1.934~25.142μg,苷Ⅲ在2.070~26.910μg范围内呈线性关系,平均加样回收率为96.6%与97.9%。     

安宫牛黄丸中黄芩苷和黄芩素的含量测定

目的:利用高效液相色谱法建立安宫牛黄丸中黄芩苷和黄芩素含量的测定方法.方法:采用高效液相色谱法.以VenusilASB-C18柱(4.6mm×250mm,5μm)为色谱柱;流动相分别为:乙腈-0.4%磷酸(21:79;35:65);检测波长:277 nm;流速:1 ml.min-1.结果:安宫牛黄丸中黄芩苷和黄芩素的含量分别为0.148%;0.0169%.结论:该方法准确、灵敏度高、重现性好,可以作为安宫牛黄丸中黄芩苷和黄芩素含量的测定方法.     

Curcuminoids as inhibitors of thioredoxin reductase: A receptor based pharmacophore study with distance mapping of the active site

Curcumin is the yellow pigment of turmeric that interacts irreversibly forming an adduct with thioredoxin reductase (TrxR), an enzyme responsible for redox control of cell and defence against oxidative stress. Docking at both the active sites of TrxR was performed to compare the potency of three naturally occurring curcuminoids, namely curcumin, demethoxy curcumin and bis-demethoxy curcumin. Results show that active sites of TrxR occur at the junction of E and F chains. Volume and area of both cavities is predicted. It has been concluded by distance mapping of the most active conformations that Se atom of catalytic residue SeCYS498, is at a distance of 3.56 from C13 of demethoxy curcumin at the E chain active site, whereas C13 carbon atom forms adduct with Se atom of SeCys 498. We report that at least one methoxy group in curcuminoids is necessary for interation with catalytic residues of thioredoxin. Pharmacophore of both active sites of the TrxR receptor for curcumin and demethoxy curcumin molecules has been drawn and proposed for design and synthesis of most probable potent antiproliferative synthetic drugs.     

A Unique Protease Cleavage Site Predicted in the Spike Protein of the Novel Pneumonia Coronavirus (2019-nCoV) Potentially Related to Viral Transmissibility

正Dear Editor,In December 2019, a novel human coronavirus caused an epidemic of severe pneumonia(Coronavirus Disease 2019,COVID-19) in Wuhan, Hubei, China(Wu et al. 2020; Zhu et al. 2020). So far, this virus has spread to all areas of China and even to other countries. The epidemic has caused 67,102 confirmed infections with 1526 fatal cases     

Comparative morphology of the carpel in the Liliaceae: Hewardieae, Petrosavieae, and Tricyrteae

The young pistils in the melanthioid tribes, Hewardieae, Petrosavieae and Tricyrteae, are uniformly tricarpellate and syncarpous. They lack raphide idioblasts. All are multiovulate, with bitegmic ovules. The Petrosavieae are marked by the presence of septal glands and incomplete syncarpy. Tepals and stamens adhere to the ovary in the Hewardieae and the Petrosavieae but not in the Tricyrteae. Two vascular bundles occur in the stamens of the Hewartlieae and Tricyrtis latifolia. Ventral bundles in the upper part of the ovary of the Hewardieae are continuous with compound septal bundles and placental bundles in the lower part. Putative ventral bundles occur in the alternate position in the Tricyrteae and putative placental bundles in the opposite. position in the Petrosavieae. The dichtomously branched stigma in each carpel of the Tricyrteae is supplied by a bifurcated dorsal bundle.     

鸡传染性法氏囊病病毒研究进展

传染性法氏囊病(Infection bursal disease, IBD)是由鸡传染性法氏囊病毒(Infectious bursal disease virus, IBDV)引起的鸡和火鸡的一种高度接触性传染病,给世界各国的禽养殖业带来了巨大损失.自IBDV发现至今新的变异株不断出现,分子结构的改变导致病毒致病力的改变及宿主对疫苗应答的改变,使得传统的疫苗已不能控制其流行,因此各国学者对其基因组结构和功能进行了广泛深入的研究,并积极研制新型有效的疫苗以达到防治的目的.     

Development of a Novel Reverse Transcription Loop-Mediated Isothermal Amplification Method for Rapid Detection of SARS-CoV-2

In conclusion, the novel visual RT-LAMP assay is a simple, rapid, and sensitive approach for detection of SARS-CoV-2, and it is ready for application in primary care and community hospitals or health care centers, and even patients' own houses in response to the current SARS-CoV-2 epidemic because the assay does not require sophisticated equipment and skilled personnel. Furthermore, it is also ready to be used in fields for screening samples from wild animals and environments to facilitate the identification of potential intermediate hosts that mediate the cross-species transmission of SARS-CoV-2 from bats to humans.     

Perinatal Vertical Transmission of Chikungunya Virus in Ruili,a Town on the Border between China and Myanmar

正Dear Editor,Chikungunya virus (CHIKV), an arbovirus in the family of Togaviridae, genus Alphavirus, is transmitted by the A.aegyptii or A. albopictus mosquito, and causes disease in humans characterized by fever, rash, and arthralgia (Silva and Dermody 2017; Suhrbier 2019). It was first reported in 1953 in Tanzania, and caused only a few outbreaks and sporadic cases in Africa and Asia in last century. However, in the epidemic in 2004, CHIKV acquired mutations that conferred enhanced transmission by the A. albopictus mosquito(Schuffenecker et al. 2006). Since then, it has successively caused outbreaks in Africa, the Indian Ocean, South East Asia, the South America, and Europe (Zeller et al. 2016).