Effect of various stabilizing agents on Imperata cylindrica grass pollen allergen extract

BACKGROUND: Allergen extracts are unstable, heat labile or susceptible to proteases. Stability of allergen extracts is important for proper diagnosis and therapy of allergic disorders. OBJECTIVE: The present study was undertaken to determine the preservation and stabilization conditions of Imperata cylindrica (Ic) grass pollen extract. METHODS: The Ic extract was kept with 0.1 mepsilon-aminocaproic acid (EACA), 0.75 m sucrose, 5% glycerol, 0.03% human serum albumin (HSA) or 0.4% phenol for different time periods. The extracts were stored for 3, 6 and 12 months each at 4 degrees C, 4 degrees C with daily exposure to room temperature (RT) for 1 h, and RT. The quality of extracts was analysed by SDS-PAGE, Western blot, ELISA, ELISA inhibition and skin test. RESULTS: Extracts kept with EACA and sucrose retained most of the protein bands followed by glycerol as determined by SDS-PAGE and Western blot during all storage periods and conditions in comparison with standard extracts. The extracts kept with HSA, phenol and without preservative (WP) showed protein degradation below 33 kDa after 3 months storage at all conditions. However, a 67-kDa allergen was stable in these extracts. EACA extract required 75 to 120 ng of protein for 50% inhibition in IgE binding under different conditions, whereas standard extract required 70 ng for the same. ELISA also demonstrated high allergenic reactivity of EACA extract. ID test on allergy patients with EACA extract demonstrated same allergenic potency as that of standard extract. CONCLUSION: EACA is the best preservative/stabilizing agent of Ic pollen extract, followed by sucrose and glycerol. Ic extract kept with phenol, HSA and without preservative showed degradation within 3 months. EACA preserved extract is equally potent as that of standard extract up to 1 year's storage.     

人血浆对红细胞保存的影响

为了研究人血浆对保存的红细胞结构和功能的影响，对悬浮红细胞、洗涤红细胞以及添加不同量血浆的红细胞成分血在不同保存时间内的红细胞的功能指标，包括pH值、K^＋浓度、Na^＋浓度、渗透脆性、血浆游离血红蛋白、乙酰胆碱酯酶活性、ATP含量、2．3-DPG、P50含量进行了比较。结果证明，血浆有利于保存血液维持其高pH值、低K^＋浓度和高Na^＋浓度，有利于保存红细胞维持其ATP含量、携氧能力和红细胞变形性，但对保存血液维持低渗透脆性，对保存血液的血浆游离血红蛋白、乙酰胆碱酯酶活性、ATP含量和2．3-DPG含量无影响。结论：在红细胞成分血中加入一定量的血浆可能有利于红细胞的长期保存。     

A natural alternative to sulphur dioxide for red wine production: Influence on colour, antioxidant activity and anthocyanin content

An alternate to sulphur dioxide natural antioxidant was tested during 2005 harvest on four different red vinifications, and was applied in each winemaking batch in combination with sulphur dioxide and on its own. Responses measured and analysed with uni- and multivariate statistics were: anthocyanin content, antioxidant capacity and classic oenological parameters. ANOVA revealed no significant effect of treatment in the antioxidant values of RA or diphenylpicrylhydrazyl (DPPH) of wines, but a paired t-test could differentiate wines treated only with SO₂ from those treated only with the novel product according to their RA values. Principal component analysis (PCA) of anthocyanin content of the treated wines gave five significant components, explaining 100% of variance and differentiating products treated only with SO₂ from those treated only with new product. PCA of oenological data explained 72% of variance in the first two components and wines were clearly differentiated on the basis of SO₂ or alternative treatment. In all cases, commercially acceptable red wines were produced, giving a possibility for partial substitution of SO₂ by a natural product.     

Optisol中期保存液房水置换对角膜内皮细胞的保护作用

目的:研究Optisol中期保存液房水置换对角膜内皮细胞的保护作用。方法:采用4℃湿房保存方法保存离体兔眼球,设立房水对照组、Optisol中期保存液房水置换组,每组10只眼球。于低温保存开始前、保存后24,48及72h检测角膜厚度、角膜内皮细胞密度及形态,保存后72h取下角膜行胎盘蓝-茜素红染色,检测角膜内皮细胞存活率。结果:4℃湿房保存开始前两组平均角膜厚度、角膜内皮细胞密度及六角形细胞比率差异没有统计学意义(P>0.05)。保存后24h两组平均角膜厚度、角膜内皮细胞密度及六角形细胞比率差异没有统计学意义(P>0.05);保存后48h及72h两组平均角膜厚度、角膜内皮细胞密度及六角形细胞比率差异有统计学意义(P<0.05)。保存后72h房水对照组角膜内皮细胞存活率为(55±5.81)%,Optisol中期保存液房水置换组角膜内皮细胞存活率为(87.16±3.64)%,两组间比较有统计学意义(P<0.05)。结论:Optisol中期保存液房水置换对角膜内皮细胞活性有保护作用,可以提高湿房保存法的效率,延长有效保存时间至72h。     

Kyoto-1保存液中移植用肺钙泵活性的研究

目的 :研究不同温度Kyoto 1(NewET K)保存液保存供体肺脏 ,不同时间内钙泵活性的变化 ,为Ky oto 1在临床上最大时限地保存供体肺提供理论依据。方法 :Wistar大鼠对照组取新鲜肺脏 ,实验组分别灌注 0℃ ,4℃的Kyoto 1保存液 ,分别放入 0℃ ,4℃冰箱中保存 4 ,2 4 ,4 8h ,进行光、电镜酶组织化学研究 ,使用图像分析系统进行定量测定。结果 :4℃ ,2 4h钙泵活性可以得到较好的保存 (P >0 .0 5 )。结论 :Kyoto 1保存供体肺 ,4℃钙泵活性可以较好的保存 2 4h。钙泵可以作为检测供肺优质保存的重要指标。