气质联用仪法检测茶叶中联苯菊酯等四种拟除虫菊酯类农药

目的应用气相色谱质谱联用技术检测茶叶中多种拟除虫菊酯类农药。方法用振荡器和样品浓缩仪优化样品前提取方法,以气质联用仪分析菊酯类农药。结果该方法相对标准偏差在2．77％～5．35％之间,回收率在80．4％～93．6％之间,线性相关系数大于0．9989。结论本方法准确可靠,可应用于茶叶中等多种拟除虫菊酯类农药的测定。     

乌龙茶及其有效成分对肝癌细胞HepG2的生长抑制作用

目的 通过探讨茶及其有效成分对肝癌细胞HepG2增殖的影响,为乌龙茶成分进一步开发提供有力的实验室证据.方法 体外培养人肝癌细胞株HepG2,加入浓度为25、50、100和200 mg/L的茶叶浸出液、茶多酚、茶色素、茶多糖、茶氨酸作用24h后,用水溶性四唑盐(WST-1)检测肝癌细胞的存活率.结果 乌龙茶及其有效成分对肝癌细胞HepG2进行干预后,各组肝癌细胞的增殖均被抑制,各组的吸光度值均低于阴性对照组,茶汤100 mg/L组和200 mg/L组、茶多酚各组和茶色素各组、茶多糖和茶氨酸50mg/L、100 mg/L和200 mg/L组,与阴性对照组比较,差异均有统计学意义(均P＜0.05).同时茶多酚25 mg/L组、茶色素25 mg/L组与茶汤25 mg/L组比较,差异均有统计学意义[(0.1658±0.0025)、(0.1913±0.0013)比(0.2005±0.0013),均P＜0.05];茶多酚50mg/L组、茶色素50mg/L组、茶多糖50 mg/L组、茶氨酸50 mg/L组与茶汤50 mg/L组比较,差异均有统计学意义[(0.1545±0.0041)、(0.1655±0.0039)、(0.1595±0.0019)、(0.1728 ±0.0040)比(0.1970 ±0.0078),均P＜0.05];茶多酚100 mg/L组(0.1370±0.0016)与茶汤100 mg/L组(0.1600 ±0.0037)比较,差异有统计学意义(P＜0.05).结论 乌龙茶及其有效成分对人肝癌细胞HepG2具有明显的抑制作用,表现出抗肝癌的作用.     

古代保健饮品相关名目考

古代保健饮品相关名目较多,大致有“茶”、“茶汤”、“药茶”、“汤”、“熟水”、“渴水”、“饮子”等。考证各名目的内涵,既有相同的方面,又各有不同特殊涵义。其中,“茶汤”一词是指一类以茶与其他植物煎液为主,具有保健治疗作用的饮品,既可以指饮用的茶液,也可以指如茶法服用的汤液。“茶汤”最能体现古代保健饮品的原本意义,也符合现代对于保健饮品的理解,可以较为全面而准确地赅括古代保健饮品的内容。     

Green tea and bone metabolism

Osteoporosis is a major health problem in both elderly women and men. Epidemiological evidence has shown an association between tea consumption and the prevention of age-related bone loss in elderly women and men. Ingestion of green tea and green tea bioactive compounds may be beneficial in mitigating bone loss of this population and decreasing their risk of osteoporotic fractures. This review describes the effect of green tea or its bioactive components on bone health, with an emphasis on (i) the prevalence and etiology of osteoporosis; (ii) the role of oxidative stress and antioxidants in osteoporosis; (iii) green tea composition and bioavailability; (iv) the effects of green tea and its active components on osteogenesis, osteoblastogenesis, and osteoclastogenesis from human epidemiological, animal, as well as cell culture studies; (v) possible mechanisms explaining the osteoprotective effects of green tea bioactive compounds; (vi) other bioactive components in tea that benefit bone health; and (vii) a summary and future direction of green tea and bone health research and the translational aspects. In general, tea and its bioactive components might decrease the risk of fracture by improving bone mineral density and supporting osteoblastic activities while suppressing osteoclastic activities.     

Reduced SARS-CoV-2 infection risk is associated with the use of Seven-Flavor Herb Tea: A multi-center observational study in Shanghai,China

ObjectiveOmicron, a severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) variant, is responsible for numerous infections in China. This study investigates the association between the use of Seven-Flavor Herb Tea (SFHT) and the risk of SARS-CoV-2 infection to develop precise and differentiated strategies for control of the coronavirus disease 2019 (COVID-19).MethodsThis case-control study was conducted at shelter hospitals and quarantine hotels in China. A total of 5348 laboratory-confirmed COVID-19 patients were enrolled between April 1 and May 31, 2022, while 2190 uninfected individuals served as healthy controls. Structured questionnaires were used to collect data on demographics, underlying diseases, vaccination status, and use of SFHT. Patients were propensity-score-matched using 1:1 nearest-neighbor matching of the logit of the propensity score. Subsequently, a conditional logistic regression model was used for data analysis.ResultsOverall, 7538 eligible subjects were recruited, with an average age of [45.54 ± 16.94] years. The age of COVID-19 patients was significantly higher than that of uninfected individuals ([48.25 ± 17.48] years vs [38.92 ± 13.41] years; t = 22.437, P < 0.001). A total of 2190 COVID-19 cases were matched with uninfected individuals at a 1:1 ratio. The use of SFHT (odds ratio = 0.753, 95% confidence interval: 0.692, 0.820) was associated with a lower risk of SARS-CoV-2 infection compared to untreated individuals.ConclusionOur findings suggest that taking SFHT reduces the risk of SARS-CoV-2 infection. This is a useful study in the larger picture of COVID-19 management, but data from large-sample multi-center, randomized clinical trial are warranted to confirm the finding.Please cite this article as: Zhang SX, Chen XX, Zheng Y, Cai BH, Shi W, Ru M, Li H, Zhang DD, Tian Y, Chen YL. Reduced SARS-CoV-2 infection risk is associated with the use of Seven-Flavor Herb Tea: A multi-center observational study in Shanghai, China. J Integr Med. 2023; 21(4):369–376.     

中国成年双生子饮茶行为分布特征

目的 描述中国双生子登记系统（CNTR）成年双生子饮茶行为的分布特征,探索饮茶行为在双生子人群中的分布规律,为探究遗传和环境因素对饮茶行为的影响提供线索。方法 样本选自2010-2018年在CNTR进行登记的双生子,纳入≥18岁且具有饮茶信息的双生子共25 264对进行分析,描述双生子中饮茶行为的人群、地区分布特征,以及不同卵型双生子饮茶行为一致率和对内饮茶量差异分布情况。结果 研究对象年龄（35.38±12.45）岁,每周饮茶者占比17.0%,饮茶量（3.36±2.44）杯/d。男性、50~59岁、南方、城镇、文化程度高、双生子中先出生的个体中每周饮茶者比例较高（P<0.05）,未婚者中比例较低（P<0.001）。双生子对内分析发现同卵饮茶行为一致率均大于异卵,饮茶遗传度为13.45%（11.38%~15.51%）,除女性亚组外,不同性别、年龄、地区间饮茶一致率差异有统计学意义（均P<0.05）;根据性别、年龄、地区分层后仅男性同卵一致率始终呈大于异卵趋势。同性别双生子对内饮茶量差异在男性中呈现同卵小于异卵的特征（P<0.05）,而女性中差异不明显。结论 本研究双生子人群饮茶行为的分布存在人群和地区差异,饮茶行为主要受环境因素影响,遗传因素影响较弱,且遗传效应大小在不同性别、年龄、地区间不尽相同,性别可修饰这一遗传作用。     

Anti-allergic activity of German chamomile (Matricaria recutita L.) in mast cell mediated allergy model

Ethnopharmacological relevance

Chamomile is most popular used medicinal plant and extensively consumed as a tea or tisanes. Traditionally this plant was used for treatment of many ailments such as allergy disorders and inflammatory mediated diseases.

Aim of the study

We investigated the effects of anti-allergic activity of Matricaria recutita L. on mast cell mediated allergic models.

Materials and methods

The protective effect of methanol extract of Matricaria recutita against compound 48/80 induced anaphylaxis and pruritis models for acute phase of hypersensitivity reactions were carried out. The late phase hypersensitivity reactions by compound 48/80 induced mast cell degranulation and histamine release from blood along with serum nitric oxide (NO), rat peritoneal fluid nitric oxide (NO) and bronchoalveolar fluid nitric oxide (NO) levels were measured.

Results

The methanol extract of Matricaria recutita L. showed inhibitory effects on anaphylaxis induced by compound 48/80 and significant dose dependent anti-pruritis property was observed by inhibiting the mast cell degranulation. Mast cell membrane stabilization activity was also observed in compound 48/80 induced mast cell activation. Dose dependent reduction in the histamine release, along with decreased release of serum, rat peritoneal and BAL fluid nitric oxide (NO) levels were observed.

Conclusion

These results suggest that the methanol extract of Matricaria recutita showed potent anti-allergic activity by inhibition of histamine release from mast cells.     

茶摄入与乳腺癌发病风险关系的系统评价/Meta分析

目的 系统评价茶摄入与乳腺癌发病风险的关系。方法 计算机检索PubMed、EMBASE、EBSCO、The Cochrane Library、CNKI、SinoMed、万方和维普数据库,搜集有关茶摄入水平与乳腺癌关系的研究,检索时间截至2016年10月6日。按纳入标准选择文献、提取资料和进行方法学质量评价后,采用RevMan 5.3 软件进行 Meta 分析。结果 共纳入37篇研究,Meta分析结果显示,茶摄入可减小乳腺癌6%的发病风险（RR=0.937,95%CI:0.901~0.974,P=0.001）。亚组分析显示,茶摄入类型为绿茶的人群罹患乳腺癌的风险约下降12%（RR=0.885,95%CI:0.800~0.978,P=0.020）;东亚人群茶摄入与欧美人群相比有明显的抑制乳腺癌的作用,可减少10%乳腺癌的发病风险（RR=0.901,95%CI:0.823~0.987,P=0.020）。结论 茶摄入能降低乳腺癌的发病风险,特别是东亚人群或茶摄入类型为绿茶时这种抑癌作用更加明显。     

茶多酚拮抗放射性颌下腺细胞凋亡的实验研究

目的 探讨茶多酚(TP)对放射性颌下腺损伤的防护作用。方法 将Wistar大鼠60只随机分为照射组(R)、茶多酚+照射组(TPR),照射前14 d至标本提取当天分别予以生理盐水和茶多酚灌胃,采用⁶⁰Co γ射线15 Gy 一次性照射大鼠头颈部。照射结束后3、6和30 d,每组各取10只大鼠颌下腺,原位末端标记法(TUNEL法)检测腺体细胞和导管细胞凋亡,免疫组织化学方法检测腺体Bcl-2﹑Bax的表达,透射电镜观察组织细胞超微结构改变。结果 茶多酚可以使照射后3﹑6和30 d 的颌下腺腺泡细胞及导管细胞凋亡指数降低,与照射组相比,差异有统计学意义(F =56.383, P <0.01);Bcl-2和Bax的表达组间差异无统计学意义;电镜下TPR组损伤较轻,细胞核凋亡改变不典型。结论 茶多酚可以对放射性颌下腺损伤起到一定防护作用,其机制可能是通过拮抗细胞凋亡实现的。     

速效牙敏消对猴牙牙本质小管堵塞作用的实验研究

为观察速效牙敏消对牙本质小管是否有堵塞作用，采用猴牙作为研究对象，通过扫描电镜及电子探针能谱分析技术，发现用药３ｍｉｎ即可出现堵塞现象，５ｍｉｎ后可形成较明显的堵塞作用，１０ｍｉｎ后堵塞较完善，堵塞物为药物的主要成份．结果提示：应用此药５～１０ｍｉｎ便能达到比较完善的脱敏作用