大豆蛋白复合纤维的漂白和增白工艺

采用双氧水和还原剂DOTU对大豆蛋白复合纤维进行氧化和还原漂白，对漂白剂浓度、pH值、温度等因素进行试验，根据漂白纤维的白度、失重率、蛋白质含量保持率等指标优选漂白生产工艺；筛选棉用荧光增白剂，并制订磁白工艺，以进一步提高大豆蛋白复合纤维的白度。     

半干法生产纺织用氧化淀粉工艺探讨

以木薯淀粉为原料,采用半干法工艺研制生产纺织用氧化淀粉,着重讨论过氧化氢、催化剂、尿素、反应时间对产品性能的影响。     

紫菜中碘含量的测定及其条件探究

通常测定海带中碘含量的方法有很多,如,灰化法,碱浸泡法等。海带中碘与有机基团(R)形成碘化物,提取海带中的碘要先将海带灼烧灰化,最后溶解,过滤,提取滤液,根据不同氧化剂氧化碘离子的不同现象,选择最合适的氧化剂氧化碘离子,最后用硫代硫酸钠滴定,从而测得海带中的碘含量。在此基础上,我们探索研究了不同氧化剂的不同作用情况,实验探索出了优选的氧化剂来做实验测定。     

Ozonation of water containing chlorine or chloramines. Reaction products and kinetics

Ozone reacts with free aqueous chlorine when present as hypochlorite ion (OCl⁻) with a second order rate constant of 120 ± 15 M⁻¹ s⁻¹ at 20°C. About 77% of the chlorine reacts to produce Cl⁻ and 23% is oxidized to ClO⁻₃. No ClO⁻₄ is formed. Conversion of chlorine to monochloramine reduces the ozone reaction rate to 26 ± 4 M⁻¹ s⁻¹, independent of pH, NH₂Cl is transformed quantitatively to NO⁻₃ and Cl⁻ by O₃. Rate data for other chloramines are also presented. The direct reaction of ozone with chlorine accounts for a significant amount of the chlorine and ozone demand found when the two oxidants are used in combination under water works conditions.     

Aminopeptidase from Streptomyces gedanensis as a useful tool for protein hydrolysate preparations with improved functional properties

The aim of the present study was to evaluate the efficiency of amino peptidase (AP) from Streptomyces gedanensis to produce protein hydrolysates (PHs) with better antioxidant, nutritional, and functional properties and to compare it with the PHs produced by commercial protease. Three proteins, soy, casein, and wheat protein were employed to produce their hydrolysates by applying 2% (w/w) AP at optimal conditions of pH 8.5 and temperature 55 °C. The results disclosed that the degree of hydrolysis ranges from 15.93 to 20.68% after 6 h showed better antioxidant activity and functional properties such as solubility, foaming properties, and water holding capacity than the commercial protease treated hydrolysates. AP treated PHs were enriched in Glu followed by Leu, Tyr, Lys, Phe, Asp, Met, His, Ile, Ala, and Val. Therefore, S. gedanensis AP would be an attractive microbial AP with high potential for the preparation of PHs which could offer industrial applications especially in the realm of producing food formulations as food additives in medicine and sport. PRACTICAL APPLICATION: AP from S. gedanensis was found to be the most effective enzyme to produce PHs with good antioxidant, nutritional, and functional properties. The antioxidant and essential amino acids of AP treated PHs unveiled that this amino peptidase could give credence to eliminate the bitter taste by hydrolysis of peptides and could offer interesting possibilities for industrial applications, including debittering of protein hydrolysates. The findings could be useful in the food industry especially in the realm of producing food formulations requiring high protein supplements.     

黑糯玉米芯色素清除O_2~-·和·OH的体外实验研究

研究了黑糯玉米芯色素(BGCP)清除超氧阴离子(O2-.)自由基和羟基自由基(.OH)的能力。用邻苯三酚法测定BGCP对O2-.清除效果;用Fenton体系法测定BGCP对.OH清除效果。结果表明:不同浓度的BGCP对O2-.都有一定的清除作用,在0.02～0.10mg/mL范围内,浓度越大对O2-.的清除率效果越好,随着时间的延长,BGCP对O2-.的清除作用迅速减弱;不同浓度的BGCP对.OH都有一定的清除效果,在0.02～0.10mg/mL范围内,浓度越大对.OH的清除效果越好。     

过氧化银的分析方法研究

本文研究了在磷酸介质中亚锰离子与过氧化银进行氧化还原反应的最佳条件和反应机理,提出了一个测定过氧化银的新方法。经生产实践检验,证明本法具有简便、快速、精度好和成本低廉等特点。