铁皮石斛与大豆异黄酮提取物协同抗氧化作用评价

目的评价铁皮石斛水提物与大豆异黄酮提取物协同抗氧化作用。方法按照卫生部《保健食品检验与评价技术规范（2003年版）》的相关要求和金氏计算公式评价铁皮石斛水提物与大豆异黄酮提取物的协同抗氧化作用。结果铁皮石斛水提物、大豆异黄酮提取物及二者合用对正常小鼠红细胞超氧化物歧化酶（SOD）活力的影响均无显著差异（P〉0．05）;但可显著提高小鼠肝组织中SOD活力和降低丙二醛（MDA）含量,联合用药对小鼠肝脏SOD活性增效系数Q值为1．44。结论铁皮石斛水提物与大豆异黄酮提取物具有协同抗氧化作用。     

Quantitative analysis of biofilm bacteria according to different stages of early childhood caries

ObjectiveMonitoring selected key species related to health or disease may facilitate caries risk assessment and discovery of novel ecological preventive and therapeutic approaches. This study aimed at quantifying Actinomyces naeslundii, Bifidobacterium spp., Lactobacillus acidophilus, Lactobacillus casei group, Streptococcus gordonii, Mitis group and Streptococcus mutans by quantitative polymerase chain reaction (qPCR) in dental biofilm from Brazilian children with different stages of early childhood caries (ECC).DesignSeventy-five preschool children were clinically evaluated by ICDAS criteria and divided into groups: caries-free (CF; n = 20), enamel caries lesions (ECL; n = 17) and dentine caries lesions (DCL; n = 38). Plaque samples from all children were collected for detection and quantification of the selected bacteria.ResultsL. acidophilus and L. casei group were absent in almost all plaque samples. No differences in relative proportions of A. naeslundii, Mitis group and S. gordonii were observed in any stage of caries. However, S. mutans and Bifidobacterium spp. were present at higher concentrations in the biofilm of children with DCL (p < 0.001). Multivariate analysis showed that S. mutans and Bifidobacterium spp. were strongly associated with biofilm in children with DCL.ConclusionDifferences were observed in the proportion of acidogenic and aciduric bacteria with dental caries progression. The data indicate that S. mutans and Bifidobacterium spp. in dental biofilm may be involved in some progression processes for ECC.     

第十一届全国儿童消化系统疾病学术会议纪要

“第十一届全国儿童消化系统疾病学术会议”于2020年11月21日以线上直播的形式召开,大会设置5个主旨演讲、21个主题报告和5个专题研讨会。这是时隔6年由中华医学会儿科学分会组织召开的全国儿科消化专业学术盛会,线上参会代表人数超过11000,本次会议将有力地推动全国儿科消化系统疾病诊治水平和基础研究水平的提高,并将进一步扩大儿科消化专业的队伍。     

HPLC法测定泮托拉唑钠肠溶胶囊的耐酸力

目的：建立测定泮托拉唑钠肠溶胶囊耐酸力的方法。方法：采用HPLC法,色谱柱为Hypersil ODS2C18（250×4.6mm,5μm）,流动相为磷酸盐缓冲液（取磷酸氢二钠1.12g与磷酸二氢钠0.18g,加水溶解并稀释至1000ml）-乙腈（70：30）,检测波长288nm,流速1.0ml/min。结果：泮托拉唑钠线性范围为8.16-81.56μg/ml（r^2=0.9993）,平均回收率为99.05%,RSD=0.46%（n=9）,三批样品耐酸力均大于95%。结论：所用方法简便快速,专属性强,灵敏度高,准确度好。     

正交设计优化盐酸氨溴索口腔崩解片的处方

目的：对盐酸氨溴索口腔崩解片的处方进行优化。方法：参照市售盐酸氨溴索片中主药含量,确定盐酸氨溴索口腔崩解片中主药用量;选用枸橼酸、酒石酸和富马酸3种矫味酸,两两组合,与微晶纤维素和甘露醇一并进行正交试验,以志愿者对苦味、麻和涩等的口感以及崩解时限、溶出度等为指标,确定微晶纤维素和甘露醇的用量以及矫味酸的种类和用量;将阿司帕坦、薄荷粉末香精和苹果粉末香精分别作为甜味剂和矫味剂,根据志愿者服用后的口感评分,确定其用量;以休止角为指标,确定助流剂硬脂酸镁的用量;交联羧甲基纤维素钠采用常规用量,即占处方的3％。结果：优化处方为：每1000片含盐酸氨溴索30g,甘露醇20g,微晶纤维素40g,枸橼酸10g,富马酸10g,阿司帕坦5g,薄荷粉末香精0．5g,苹果粉末香精0．5g,硬脂酸镁1g,交联羧甲基纤维素钠4g。采用优化处方制备的盐酸氨溴索口腔崩解片口感明显改善,崩解时限和溶出度均符合要求,并与市售盐酸氨溴索片生物等效,起效更迅速。结论：得到了符合盐酸氨溴索口腔崩解片剂型要求的处方。     

不同产地乌药的HPLC指纹图谱研究

目的 采用已建立的乌药HPLC指纹图谱检测方法,对不同产地乌药进行鉴别研究。方法 以Symmetry C₁₈（150 mm×4.6 mm,5 μm）为色谱柱,乙腈-水为流动相进行梯度洗脱,在235 nm波长下以乌药醚内酯为参照物测定了6个不同产地乌药的指纹图谱。按照乌药HPLC指纹图谱共有模式,标定6个共有指纹峰,并对不同产地乌药指纹图谱进行相似度比较。结果 台乌药和其他5个产地乌药的指纹图谱,存在显著的差异。同时也对该指纹图谱检测方法进行了验证。结论 通过HPLC指纹图谱方法,能够明显区别台乌药与其他产区的乌药,该方法可作为台乌药真伪鉴别的有效方法。     

高效液相色谱-蒸发光散射法测定铁皮石斛中单糖和双糖

目的建立高效液相色谱-蒸发光散射(HPLC-ELSD)测定铁皮石斛药材中单糖和双糖的含量分析方法。方法色谱柱Shodex Asahipak NH2(250 mm×4.6 mm,5μm),流动相为乙腈-水(78∶22),流速1.0 mL.min-1,柱温30℃;ELSD参数:漂移管温度为100℃,气体流量为1.60 L.min-1。结果果糖、葡萄糖和蔗糖分别在1.38～7.69μg(r=0.999 8),4.87～23.31μg(r=0.999 9),5.91～36.28μg(r=0.999 9)范围内呈良好的线性关系,加样回收率在95.20%～103.0%之间。结论该方法简便、准确、重复性好,适用于铁皮石斛中单糖和双糖的含量测定。     

银杏叶提取工艺正交试验研究

目的以总黄酮醇苷、萜类内酯的综合转移率为指标,确定银杏叶最佳提取工艺。方法采用正交设计方法,系统考察乙醇浓度、料液比、提取时间3个因素对银杏叶提取工艺的影响,利用高效液相色谱法测定总黄酮醇苷、萜类内酯的含量,计算转移率。结果最佳提取工艺条件为:采用85%乙醇加热回流提取3次,第1次加5倍量(V/W)溶剂提取3 h,后2次分别加入3倍量(V/W)溶剂提取2 h。结论本工艺操作简单、合理、节能、高效,适用于工业化生产。     

A case of solid pseudopapillary neoplasm of the pancreas and tumor doubling time

Background: Solid pseudopapillary neoplasm of the pancreas is a rare tumor with unique clinicopathological features. Although it is considered to grow slowly, little is known about its doubling time. Method: We encountered a young Japanese woman with a solid pseudopap-illary neoplasm of the pancreas that had been detected at another hospital 5 years previously but was resected at our hospital. The tumor showed only a solid component without any cysts. Computed tomographic scans taken 5 years apart were compared to determine the tumor doubling time. Result: The tumor doubling time according to the formula of Schwartz and co-workers was determined to be 765 days. Conclusion: These findings confirm that this tumor grows quite slowly and also support long disease-free periods even in patients who have recurrence or metastases.