UPLC指纹图谱结合多成分含量测定的天麻饮片质量研究

目的建立天麻饮片UPLC指纹图谱和同时测定天麻饮片中天麻素、对羟基苯甲醇、巴利森苷B、巴利森苷C、巴利森苷A的超高效液相色谱分析方法。方法采用Waters Acquity超高效液相系统,Waters ACQUITY UPLC BEH C18(50 mm×2.1 mm,1.7μm)色谱柱,流动相为乙腈-0.1%甲酸水,梯度洗脱,检测波长270 nm(指纹图谱)、220 nm(含量测定),体积流量为0.3 mL/min,柱温35℃。通过相似度评价、主成分分析、偏最小二乘判别分析对28批天麻饮片指纹图谱进行分析,通过对照品比对对主要共有峰进行指认和含量测定。结果建立了不同产地天麻的指纹图谱,标定了20个共有峰,并指认了其中6个共有峰:天麻素(1号峰)、对羟基苯甲醇(3号峰)、对羟基苯甲醛(7号峰)、巴利森苷B(14号峰)、巴利森苷C(15号峰)、巴利森苷A(18号峰)。28批样品相似度均在0.90以上,主成分分析将不同产地天麻分为5组,并发现对羟基苯甲醇、对羟基苯甲醛、巴利森苷A等6个差异成分。同一成分在各产地天麻饮片中的含量差异明显,不同成分的波动范围不同,各产地5种成分总量贵州(2.52%)云南(2.49%)陕西(2.33%)湖北(2.10%)浙江(1.90%)安徽(1.65%)。结论建立不同产地天麻UPLC指纹图谱结合多成分含量测定方法为完善天麻饮片的质量控制提供了参考。     

An epidemic of occupational contact dermatitis from an immersion oil for microscopy in laboratory personnel

Since November 1997, 14 successive cases of occupational contact dermatitis were observed in 13 laboratory technicians and 1 physician, working in a genetics laboratory in Leuven (Belgium) in 3 laboratories of bacteriology in Strasbourg, Montbeliard and Angers, and in the laboratory of hematology in Bordeaux (France). The dermatitis, located on the hands, forearms and face, relapsed after each exposure to an immersion oil for microscopy. Patch tests performed in 10 patients were positive to epoxy resin (ER) in the European standard series (10/10 patients) and to newly formulated Leica immersion oil (7/7), 1 patient testing negatively with the former oil. A breakdown performed in 2 patients with the oil's ingredients confirmed sensitization to liquid modified ER components, contained at >80% concentration in the oil. The presence of DGEBA was demonstrated by HPLC analysis at a +/-30% rate. Although the safety data sheet indicated a revision of the formula, nobody was alerted to the risk of sensitization and the need for skin protection. ERs, as a source of occupational allergy, can provoke epidemics of contact dermatitis in industry. This report of epidemic contact dermatitis from ERs, used for their optical properties in an immersion oil for microscopy, emphasizes the need for perpetual vigilance in occupational medicine and the usefulness of multicentre contacts in dermato-allergology.     

Pretibial dystrophic epidermolysis bullosa: a recessively inherited COL7A1 splice site mutation affecting procollagen VII processing

Pretibial epidermolysis bullosa (PEB) is a rare form of localized epidermolysis bullosa dystrophica (EBD), a heterogeneous group of inherited, blistering diseases characterized by scarring, loss of dermal-epidermal adhesion and altered anchoring fibrils (AF). Mutations in the type VII collagen gene (COL7A1) underlie EBD and in a dominant PEB family a glycine substitution mutation has been identified. We report a 33-year-old man affected by PEB showing abnormal AF and reduced immunostaining for type VII collagen. Mutation search in the COL7A1 gene revealed a 14 bp deletion in the 115 exon-intron boundary (33563del14), which resulted in the in-frame skipping of exon 115 with elimination of 29 amino acids from the pro-alpha1(VII) polypeptide chain. As a consequence, procollagen VII failed to be processed to mature collagen VII and accumulated at the dermal-epidermal junction, as revealed by immunofluorescence staining using a NC-2 domain-specific antibody. The proband's father was a clinically unaffected heterozygous carrier of mutation 33563del14, whereas the maternal pathogenetic mutation has still not been identified. This represents the first report of a recessive deletion mutation in PEB and extends the range of EBD phenotypes associated with mutation 33563del14.     

从雷公藤中分离出一种新成分——雷藤三萜酸A

从雷公藤(Tripterygium wilfordii Hook f.)的根皮中分离出一种新的单体。该单体系由柱层析分离出的一种粗结晶,经用无水乙醇重结晶,得白色针状结晶,mp 304～308℃ (分解)。根据其化学反应、红外光谱、核磁共振氢谱以及高分辨质谱等数据,确定其分子量为472,分子式为C_(30)H_(48)O_4,并推定其化学结构为3β,15β     

假升麻中2个新的单萜苷类化合物

目的研究假升麻Aruncus sylvester根的化学成分。方法采用大孔树脂、硅胶及反相ODS柱色谱等方法进行分离和纯化,并综合运用NMR、HR-ESI-MS等波谱手段以及ECD计算等方法鉴定化合物的结构。结果从假升麻乙醇提取物正丁醇萃取部分中分离得到2个新的单萜苷,分别鉴定为(2E,4S,5R)-4-hydroxy-3-[2-(β-D-glucopyranosyloxy)ethylidene]-5-(2-methylprop-1-en-1-yl)dihydrofuran-2(3H)-one(1)、(2Z,4S,5R)-4-hydroxy-3-[2-(β-D-glucopyranosyloxy)ethylidene]-5-(2-methylprop-1-en-1-yl)dihydrofuran-2(3H)-one(2)。结论化合物1和2均为新化合物,分别命名为假升麻苷A和假升麻苷B。     

常压室温等离子体-紫外复合诱变选育新硫肽类抗生素166A高产菌株

摘要：目的 通过对新硫肽类抗生素166A产生菌小单孢菌TMD166进行诱变选育研究,以期获得产166A的高产菌株。方 法 使用多功能等离子体诱变系统(multifunctional plasma mutagenesis system, MPMS)对出发菌株TMD166的孢子进行等离子体-紫 外(MPMS-UV)复合诱变,单孢子悬液经照射处理、涂布培养后获得单菌落,并以牛津杯固体发酵高通量筛选方法对菌株进行初 筛,之后对高产菌株进行摇瓶复筛,利用突变株摇瓶发酵的化学效价筛选出正突变菌株。结果 对比MPMS-UV不同诱变剂量发 现,MPMS105s-UV60s复合诱变剂量获得的正突变率最高,达到41.43%,相应致死率为99.88%。最终筛选出一株166A高产突 变株TMD166-MU1,在培养温度为28℃、210 r/min的条件下,经过96~120 h培养后,166A产量相比出发菌株提高了7.47倍。结 论 采用MPMS-UV复合诱变方式,再结合牛津杯固体发酵高通量筛选方法和摇瓶复筛,可高效筛选获得166A高产菌株。     

银杏内酯A对胆碱能神经功能损伤引起的SD大鼠学习记忆的促进作用

目的 研究银杏内酯A对Meynert基底核（NBA)损伤引起的SD大鼠学习记忆的改善作用。方法 通过N－甲基－D－天冬氨酸（NMDA）单侧损伤SD大鼠NMB以破坏胆碱能神经功能，采用Y型迷宫法检测动物空间辨别学习记忆能力，利用放射化学法检测皮层胆碱乙酰转移酶（ChAT)活力，观察银杏内酯A对胆碱能损伤记忆功能的恢复，脑内ChAT的变化。结果 银杏内酯A对胆碱能损伤记忆功能具有恢复作用，且能防止ChAT活力降低。结论 银杏内酯A能改善NBM损伤引起的大鼠学习记忆能力。     

长链非编码RNA LINC00641通过微小RNA-181d-5p靶向真核细胞翻译起始因子4A2抑制宫颈癌细胞增殖的研究

目的 观察长链非编码RNA(LncRNA)LINC00641(LINC00641)在宫颈癌细胞中的表达特征,探讨LINC00641通过微小RNA-181 d-5p(miR-181 d-5p)/真核细胞翻译起始因子4A2(EIF4A2)对宫颈癌细胞增殖的调节作用.方法 选择宫颈癌Hela细胞株,建立空白对照组,构建转染p...     

Sjogren-Larsson综合征致病基因位点分析

【摘要】 目的 检测分析2例Sjogren-Larsson综合征患者的致病基因突变。方法 收集首都儿科研究所皮肤科门诊诊治的2例Sjogren-Larsson综合征患儿临床资料,通过基因检测明确致病基因突变位点。结果 2例患者均有典型的鱼鳞病样皮肤表现,合并一定程度的智力障碍及生长发育运动能力落后情况,例1存在已报道ALDH3A2基因c.1157A＞G的纯合突变;例2的ALDH3A2基因c.1157A＞G及c.1309A＞T复合杂合突变为新的致病突变。结论 对可疑Sjogren-Larsson综合征患儿应尽早进行基因检测,有助于及早发现并明确诊断。     

三甲医院护士突发公共卫生事件应急能力现况调查与分析

目的调查三级甲等医院护士突发公共卫生事件应急能力现况,并分析其影响因素,为三级医院构建应急培训体系提供参考。方法采取便利抽样法,以某三级甲等医院临床注册护士为研究对象,进行护士突发公共卫生事件应急能力横断面调查。结果三级甲等医院护士突发公共卫生事件应急能力平均得分为(3.94±0.18)分,量表的3个维度得分中急救能力最高(4.10±0.16)分,应急知识最低(3.75±0.12)分。各条目平均得分中,掌握急救设备最高(4.29±0.70)分,概念及法律法规最低(3.62±0.78)分。性别、是否参加过应急培训、应急演练、是否经历过救援活动是三甲医院护士应急能力的主要影响因素(P<0.05)。结论三级甲等医院护士突发公共卫生事件应急能力在中等偏上水平,接近高水平,但仍需进一步提高,建议三级甲等医院构建科学、系统的护理应急培训体系,有针对性地提高护理应急能力。