DrugFET的研究（XⅢ）：四苯硼钠一烟碱FET的研制与应用

本文将离子敏感场效应晶体管（ＩＳＦＥＴ）与药物敏感膜相结合,研制成一种药物敏感场效应晶体管传感器（ＤｒｕｇＦＥＴ）。用四苯硼钠为电活性物质,邻苯二甲酸二辛酯为增塑剂,制成ｐｖｃ膜,对烟碱的线性范围为１．０×１０－２～２．０×１０－５ｍｏｌ／Ｌ,斜率为５７．５ｍｖ／ｐｃ,适宜ｐＨ范围为５．５～８．０,检出限为１．０×１０－６ｍｏｌ／Ｌ。用该传感器分析烟草中烟碱的含量,结果和分光光度法相一致。     

烟叶中烟碱含量的非水滴定法研究

采用两种方法测定了烟叶中烟碱的含量，一种是紫外分光光度法，即国际标准法，另一种是非水滴定法。并将两种方法的测定结果进行对照后，得到相同样品的一对测定结果非常接近。经用ｔ检验法检验，得临界值ｔ（０．０５，８）＝２．３１计算值ｔ＝０．２９，０．２９＜＜２．３１，因此，非水滴定法是成熟的，准确的。     

卷烟烟气中的有害化学物质及与健康的关系

随着经济发展和社会进步，人们对“吸烟与健康”的认识进一步深化，控烟已是大势所趋；由于种种原因，一部分人具有吸烟的嗜好，无法做到不吸烟，唯一的选择就是尽可能吸一些对人体危害轻、安全性强的烟，因此，研究卷烟产生的有害化学物质，并尽可能地减少这些化学物质就显得尤其重要。本文论述了卷烟烟气中的有害化学物质，并论述了这些有害化学物质对人体健康的影响，以期为生产安全卷烟提供理论基础。     

The neuroprotective effect of L-Theanine and its inhibition on nicotine dependence

The benefits of tea for human health are widely accepted all over the world. L-Theanine, a nonprotein amino acid found in tea plants, is the major tea component that contributes to the unique pleasing taste of tea. L-Theanine has been shown to promote relaxation, enhance cognitive performance and act antagonistically against the excitement induced by caffeine. Recently, it was found that L-Theanine had inhibitory effect on nicotine dependence. This paper reviews the neuroprotective properties of L-Theanine and discusses the inhibitory effects of L-Theanine on nicotine dependence.     

The effect of nicotine on ethanol-induced gastric ulcers in rats

Summary Nicotine, in concentrations of 5 and 25 g/ml drinking water, given ad libitum for 10 days, dose-dependently increased lesion formation and worsened ethanol-induced ulceration in rat stomachs. Daily fluid intake and b.wt gain were not adversely affected by nicotine pretreatment.The authors are grateful to Mr C.T. Luk for his skilled technical assistance.     

烟草样品中几种化学成分的近红外分析精度研究

应用傅立叶变换近红外光谱仪,分别对具代表性的2003~2005年的烤烟样品和2005年烤烟样品建立了近红外光谱与灰分、尼古丁、石油醚提取物、石油醚提取物中性成分4种成分含量间的关系模型,经57个代表性样品预测精度的分析,F检验结果显示:灰分为1.2371;尼古丁为1.8262;石油醚提取物为1.6667;石油醚提取物中性成分为4.6311.两类近红外预测模型对灰分的预测没有显著性区别,而对尼古丁、石油醚提取物、石油醚提取物中性成分的预测有显著性区别.     

荷移光谱法测定烟草中烟碱的含量

研究了氯冉酸与烟碱的反应，确定了反应条件，氯冉酸与烟碱的络合物的最大吸收波长为530nm，在乙醇、甲醇、正丙醇、异丙醇、正丁醇、正庚醇、正己醇溶剂中，烟碱的浓度在0．04-0．40mg/mL范围内呈线性关系，该方法重现性好，灵敏度高，操作简单，用于测定烟草中烟碱的含量，精密度好，RSD为1．05％，测定烟草中烟碱的回收率为98％—103％，结果令人满意。     

Evidence for an olfactory receptor which responds to nicotine — nicotine as an odorant

Summary The tobacco alkaloid (S)(–)-nicotine, when applied as a vapour to an in vitro head preparation, stimulates the olfactory epithelium in three strains of rats and to a lesser extent in two strains of mice. The electro-olfactogram (EOG) generated by nicotine has similar characteristics to the EOGs produced by known odorants. The nicotine EOG increases with increasing concentration of nicotine vapour (1–100 nM) applied to the olfactory epithelium.Differential reduction of the nicotine EOG by the lectin concanavalin A is seen in Wistar and Lister Hooded rats. The reduction of the nicotine EOG by concanavalin A is prevented by adding alpha-methyl-D-mannoside to the lectin superfusion medium. This suggests that there is a glyco-moiety associated with at least one olfactory receptor responding to nicotine.Our results suggest that rat olfactory epithelium has receptor sites for nicotine. Nicotine is an unusual compound because it shows both odorant and pharmacological properties.22 September 1986     

流动注射电位法测定烟草和烟气中的尼古丁

通过研制一种石墨管状流通式尼古丁传感器,建立了流动注射电位法测定尼古丁的新方法．探讨了实验的最佳条件,用10－5mol·L-1的尼古丁溶液作载液,以NaH2PO4-Na2HPO4缓冲溶液控制酸度,进样体积300μL,对1．0×104－～1．0×10-4mol·L－1的尼古丁溶液有良好的线性响应,相关系数0．9987,进样频率80次·h-1．该方法简便、快速、选择性好,适用于大批量烟叶及卷烟烟气样品中尼古丁的分析测试．     

烟草中烟碱水蒸气蒸馏分离及测定

本文系统地研究了烟草中烟碱的水蒸气蒸馏的适宜条件及烟草中烟碱的定量分析方法，提出了在碱性条件下将烟草浸泡１２ｈ以上用水蒸气蒸馏法收集７００￣８００ｍＬ，蒸出液，即可收集到９５％以上的烟碱，分别用酸碱滴定法和紫外光谱法测定烟碱含量，通过比较，可以看出紫外光谱法较快速和准确。