Bioavailability of intramuscularly administered tenoxicam

Bioavailability of intramuscularly administered tenoxicam relative to single oral and relative to intravenous doses was determined in two separate randomized crossover studies. Twelve healthy volunteers (12 males, age 20–30 years) received a rapid intravenous injection and a single intramuscular dose and 12 other subjects (11 males, 1 female, age 21–25 years) a single oral and a single intramuscular dose of 20 mg of tenoxicam on two different occasions. The wash-out period between the two consecutive treatments was 4 weeks. Plasma concentrations after dosing were determined by a specific HPLC method. Differences in tenoxicam concentration-time profiles after the different routes of administration were limited to the first 2 h after dosing. Later, plasma concentrations were almost superimposable within and across the two studies. The extent of absorption of intramuscularly administered tenoxicam was complete (mean ± CV per cent: F_abs 0.99 ± 20 per cent) with no difference between the two extravascular administrations (F_rel 0.95 ± 10 per cent, intramuscular vs oral). After intramuscular administration tenoxicam was more rapidly absorbed compared to the oral dose (T_max 0.71 h ± 80 per cent vs 1.4 h ± 62 per cent; p>0.05). Peak concentrations after oral and intramuscular administration (C_max 2.5 mg 1^?1 ± 19 per cent vs 2.7 mg l^?1 14 per cent; p <0.05) were very similar.     

Treatment of gingival lichen with free palatal grafts

BACKGROUND: Recalcitrant gingival erythematous lichen planus/lichenoid lesions comprise a considerable therapeutic problem. The objective of this study was to evaluate the therapeutic effect of grafting keratinized oral palatal mucosa to the sites of gingival lichen. METHODS: In 12 patients 20 grafts were transplanted to buccal gingival lesions. Mean age of the patients was 59.8 +/- 7.1 years (range 46-71 years). The mean observation time was 32 +/- 32.7 months (range 5-97 months). RESULTS: On a 4-point clinical grade scale (0-3), 12 (60%) transplants showed complete healing grade 3, six (30%) grade 2 and two (10%) grade 1. CONCLUSIONS: Using oral mucosal grafts from the palatal mucosa for the treatment of recalcitrant erythematous gingival lichen planus/lichenoid lesions seems to be a promising treatment modality.     

反相高效液相色谱法测定丹参中丹参酮工和丹参酮ⅡA的含量

[目的]用反相高效液相色谱法(RP-HPLC)同时测定丹参药材中丹参酮Ⅰ和丹参酮ⅡA的含量．[方法]选用mightysil RP-18(H)GP250-4．6(5μm)．流动相为甲醇-水(75：25)，检测波长为270nm，流速为1mL／min，温度为35℃．[结果]丹参酮Ⅰ和丹参酮ⅡA含量分别在0．0952～0．9520μg和0．1222～0．2850μg内呈线性关系；丹参酮Ⅰ和丹参酮ⅡA的平均回收率分另4为99．90％和99．69％．[结论]此方法快速、简便、可靠，为丹参及其制剂质量控制的科学方法。     

大鼠脑内儿茶酚胺类递质及其代谢物的同时提取及反向高效液相测定法

目的建立一种操作简便、高效的测定脑组织中去甲肾上腺素(NA)、肾上腺素(AD)、多巴胺(DA)、3,4二羟基苯乙酸(DOPAC)及高香草酸(HVA)的方法,为有关药物作用机理的研究提供实验手段.方法以有机溶剂提取,高效液相色谱--电化学检测器(HPLC-EC)测定大鼠纹状体、皮质、下丘脑NA、AD、DA、DOPAC及HVA的含量.结果测得NA、AD、DA、DOPAC及HVA的绝对回收率依次分别为:80.3%±12.4%,86.5%±14.3%,90.3%±12.1%,89.5%±17.2%、87.6%±[13].2%.线性范围0.2～20ng,批内与批间变异系数分别小于8%及10%.结论该方法具有简便、迅速、回收率较高的特点,便于实验室应用.     

福建产舟山眼镜蛇毒细胞毒素的快速分离纯化及鉴定

目的 从舟山眼镜蛇毒中分离纯化细胞毒素(CTX)，并鉴定其理化性质。方法 采用SP—Sephadex C-25阳离子交换色谱及Sephasil Peptide C18反相高效液相色谱法从舟山眼镜蛇毒中分离纯化CTX，SDS—PAGE(Tris—Tricine系统)鉴定纯度，Edman降解法测定N端氨基酸序列。结果 粗毒经阳离子交换色谱，得到14个蛋白峰，其中第X～XⅢ峰具CTX活性；再分别经反相色谱纯化，得到4个CTX．总得率为32.48％；SDS—PAGE显示为均一蛋白，分子量依次为：7．28，7．33，7．24和7．38kD；测定它们N端20个氨基酸序列。结论 采用阳离子交换和反相高效液相色谱可快速、高效地从眼镜蛇毒中获得4个CTX纯品。     

口腔黏膜下纤维性变S100蛋白表达

目的 :研究口腔黏膜下纤维性变中S10 0蛋白的表达水平及其与正常口腔黏膜上皮、异常增生上皮的比较。方法 :应用免疫组织化学 (SP)法 ,检测 10例口腔黏膜下纤维性变、10例上皮异常增生、8例正常口腔黏膜上皮S10 0蛋白表达水平 ,并作对比研究。结果 :S10 0蛋白在正常口腔黏膜上皮中无表达 ,口腔黏膜下纤维性变上皮中和异常增生上皮中S10 0的阳性表达率为 5 0 %,后两者的阳性表达率明显高于正常黏膜组上皮 (P <0 .0 5 ) ;口腔黏膜下纤维性变组与异常增生上皮组比较 ,差异无显著性 (P >0 .0 5 )。结论 :口腔黏膜下纤维性变发生发展与S10 0蛋白过表达密切相关 ,S10 0蛋白表达强度与异常增生上皮表达强度一致。     

FKBP6基因278C/A单核苷酸多态性与原发无精症相关研究

目的对FKBP6基因第3、4外显子进行突变和多态性筛查,研究第3外显子278C/A位点及第2内含子C/T位点(rs7797242)在无精症患者和正常男性中的多态性,初步探讨与原发无精症的相关性。方法采用变性高效液相色谱和聚合酶链反应-限制性片段长度多态性方法,对第3、4外显子进行突变和多态性筛查,对177例无精症患者和231名正常男性的278C/A和C/T(rs7797242)多态性进行基因分型。结果278C和278A等位基因频率符合Hardy-Weinberg平衡。无精症患者278A显著低于正常对照,差异有统计学意义(P<0.05)。C/T多态性在两组中均未检出,第3、4外显子未筛查到新的变异。结论278A等位基因可能与原发无精症相关。C/T(rs7797242)及370G/A,430G/C,467T/C,468G/A在中国人群中非常罕见。     

高效液相色谱法测定不同部位两面针原植物中L-芝麻脂素和L-细辛脂素的含量

目的　建立两面针原植物中L-芝麻脂素和L-细辛脂素的测定方法,并测定两面针不同部位两者的含量。方法　采用高效液相色谱法（HPLC）,色谱柱为HYPERSIL　BDS　C18,流动相为乙腈:水（50:50）,检测波长287nm。结果　L-芝麻脂素和L-细辛脂素的平均回收率和相对标准差分别为100.13％、1.61％和101.24％、1.46％。结论　此法可用于两面针的质量控制。两面针原植物根部的被测成分含量最高。