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目的检测同型半胱氨酸的稳定性。方法采集标本,分别采用EDTA抗凝和肝素抗凝,使用日立7180全自动生化分析仪来观察同型半胱氨酸的稳定性。结果(1)发现EDTA和肝素抗凝血浆在复溶后,HCY的测定稳定48 h。随时间的延长,HCY的测定在两个血浆类型中都降低。EDTA抗凝血浆与肝素抗凝血中的HCY水平有显著差异。(2)肝素管里冰冻血浆,可能是由于分离胶体的原因,导致HCY的测定结果偏高。结论在两种血浆中HCY稳定性都较好,在EDTA抗凝管中HCY的测定稳定48 h,HCY的测定在冷冻的肝素分离胶管中对检测结果影响很大,但在肝素抗凝分离胶管中,保存在2℃-8℃可稳定72 h。 相似文献
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为观察大剂量抗坏血酸对纤溶系统活性的影响,测定了健康家兔和风湿性心脏病病人的ELT。实验证明,抗坏血酸具有促纤溶作用,而抗坏血酸注射液抑制纤溶系统活性,这与其所含稳定剂亚硫酸氢钠明显抑制纤溶系统活性有关。 相似文献
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本文用胶原粘附法测定了抗坏血酸注射液对大鼠血小板粘附性的影响。结果表明,抗坏血酸本身抑制血小板粘附性,而抗坏血酸注射液则轻度增强血小板粘附性,这与其所含稳定剂偏重亚硫酸钠明显增加血小板粘附性有关。 相似文献
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用线性变温法对硫酸链霉素粉针的稳定性进行了测定,得出25℃时的降解反应速度常数 k_(25)为1.744×10~(-6)h~(-1)、化学反应的表观活化能为107.9kJ/mol,25℃时贮存的 t_(0.9)为6.9年。 相似文献
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多元线性模型预测药物的稳定性 总被引:12,自引:0,他引:12
首次提出了预测药物稳定性的多元线性模型。该模型指出,任何满足恒温降解动力学公式和Arrhenius公式的药物,都可在3维坐标系中以药物平面形式表示。以药物的浓度函数ln[f(c0)-f(c)]和绝对温度的倒数1/T为变量,对时间的对数ln(t)进行多元线性回归,可以计算得到药物的活化能和室温贮存期。应用多元线性模型和经典恒温法对替诺昔康注射液(自制)、抗坏血酸注射液及盐酸丁卡因水溶液的室温贮存期预测的结果表明:两者无显著性差异,而本模型可大大减少实验次数,应用SAS软件使数据处理更简便。 相似文献
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抗坏血酸钛的毒性研究 总被引:3,自引:0,他引:3
钛化合物广泛用于治金、航天、国防、医疗、食品工业。80年代我国将抗坏血酸钛用于农牧养殖业和水产业,对动植物均有促进生长作用,并取得一定经济效果。人类食用该化合物能否产生毒害作用国内外报道不多。为此,我们进行了抗坏血酸钛络合物(TiAsA)的毒性研究。 相似文献
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小儿清肺止咳糖浆中盐酸异丙嗪稳定性研究常忆凌,刘尚保(武汉市二医院,武汉430014)刘本(湖北中医学院,武汉430061)小儿清肺止咳糖浆由桔梗、黄芩、川贝、杏仁等六味中药和盐酸异丙嗪组成。本文用三波长分光光度法对糖浆中的盐酸异丙嗪进行了测定,研究... 相似文献
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Anahita Fathi-Azarbayjani Poh Leng Tan Yew Ying Chan Sui Yung Chan 《Scientia pharmaceutica》2013,81(4):1141-1150
Objective
Physical UV absorbers such as titanium dioxide or zinc oxide have been found to be highly protective against ultraviolet radiation. Sun protection factor depends on the accumulation of the minerals on the skin. UV-absorbing agents must accumulate within the upper skin layers in order to provide a dense light-absorbing layer and guarantee water resistance. The aim of this work was to increase the skin deposition and efficacy of sunscreens without increasing their skin permeation. The application possibility of EDX to determine the quantitative elemental composition of zinc and titanium on the skin surface was studied.Method
The changes induced in the skin deposition of physical UV absorbers in conjunction with ascorbic acid were studied. In vitro skin permeation and X-ray elemental analysis were carried out to determine the mineral skin deposition effect of ascorbic acid.Key findings
Results indicate that ascorbic acid may significantly increase the skin deposition (p < 0.05) of these minerals on the skin without increasing their skin permeation (p > 0.05). Flow through diffusion cell and X-ray elemental analyses appear to be complementary and show that ascorbic acid is able to increase accumulation of sunscreen on the skin. 相似文献15.
To obtain some insight into the toxicity of paraquat (PQ) in humans, PQ dichloride at 250 ppm in the diet was administered
to both normal (NO) rats and ODS-od/od (OD) rats which are unable to synthesize ascorbic acid (AsA). Firstly, OD rats and
NO rats treated with PQ were compared with untreated NO rats (CO). Only OD rats displayed several symptoms of PQ poisoning
such as anorexia, hypokinesia, diarrhea, epistaxis, tremor and their pili became rough about 9 days after. Their cysteine
proteinase inhibitor level in plasma and lung increased to 2- and 6-fold, respectively, of CO. In contrast, NO rats treated
with PQ resembled CO rats, and their cysteine proteinase inhibitor levels were unchanged until 11 days. After this period
they began to display symptoms. Secondly, OD rats fed with different amounts of AsA were compared. Excess AsA delayed the
onset of symptoms by only 1 day. Thirdly, the day of onset of symptoms was found to be influenced with the weight of rats.
Received: 18 April 1995 / Accepted: 9 August 1995 相似文献
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Effects on performance of 1,2 and 4g ascorbic acid were studied from 0.5–5.5 h after ingestion in six healthy females. Diazepam (5 mg) was included as an active control, and it impaired digit symbol substitution, visuomotor coordination and complex reaction time. There were no effects of any dose of ascorbic acid on performance. 相似文献
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腺苷钴胺及其片剂的稳定性考察 总被引:1,自引:0,他引:1
考察了腺苷钴胺原料药及其片剂的长期稳定性。结果表明在避光条件下保存3a,原料药稳定,片剂稳定性降低,为该品的生产和贮存提供参考。 相似文献
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目的:采用HPLC-UV方法测定丹酚酸B在全血和血浆中的药物浓度变化情况,比较在两种介质中的丹酚酸B的浓度变化差异,考察丹酚酸B在这两种介质中的稳定性,为丹酚酸B的方法学优化提供依据,并规范含丹酚酸B血浆样品的处理方法。方法:静脉给予大鼠丹酚酸B后,于给药后不同时间取血测定血浆和全血中丹酚酸B的浓度;同时取空白全血和血浆,加入丹酚酸B标准品,放置不同时间后测定丹酚酸B的浓度。结果:大鼠静脉给予丹酚酸B后,药物浓度迅速下降,同一时间点取得的全血中所含药物浓度均显著低于血浆药物浓度(P<0.01)。制备含丹酚酸B的血浆和全血,放置相同时间的全血药物浓度显著低于同时间点的血浆药物浓度(P<0.01),全血药物浓度随放置时间增加显著降低(P<0.05),血浆药物浓度随放置时间增加无显著性降低。结论:丹酚酸B在血浆中的稳定性高于其在全血中的稳定性,建议在丹酚酸B的药代动力学研究中,取血后需要立即分离血浆,并尽快提取处理样品,避免人为误差导致血浆浓度偏低。 相似文献
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为了研究胃粘膜分泌维生素C的情况,对10例胃粘膜正常的人进行了研究。所有被研究者在禁食标饮10小时后,先观察空腹基础状态下胃液中维生素C浓度及胃粘膜的维生素C分泌,然后静脉注射维生素C,再观察给药后不同时间胃液中维生素C浓度的变化。结果空腹基础状态下胃液中维生素C浓度明显高于血中维生素C浓度,静脉注射维生素C后,胃液中维生素C浓度逐渐增高,提示胃粘膜有分泌维生素C的能力。胃粘膜的维生素C分泌量平均 相似文献