The aggregation of dansyl chloride (DNS-Cl) in acetone has been studied indetail by steady-state fluorescence techniques. It has been demonstrated that DNS-Cl is stable inacetone during purification and aggregation st...The aggregation of dansyl chloride (DNS-Cl) in acetone has been studied indetail by steady-state fluorescence techniques. It has been demonstrated that DNS-Cl is stable inacetone during purification and aggregation study processes. The aggregates are not solvolyzed inacetone, and do not take part in any chemical reactions either. It has been found that DNS-Cl tendsto aggregate even when its concentration is much lower than its solubility in acetone. Theaggregation is reversible, and both the aggregation and the deaggregation are very slow processes.Introduction of SDS has a positive effect upon the formation and stabilization of the aggregates.展开更多
本研究通过测定不同pH值、温度、乙醇含量以及NaCl含量条件对组胺、腐胺、尸胺降解的影响,探究是否与菌种在相应条件下的生长状况有关。建立一种测定生物胺降解的高效液相色谱-紫外检测法,通过丹磺酰氯衍生后,采用配有紫外检测器的高效...本研究通过测定不同pH值、温度、乙醇含量以及NaCl含量条件对组胺、腐胺、尸胺降解的影响,探究是否与菌种在相应条件下的生长状况有关。建立一种测定生物胺降解的高效液相色谱-紫外检测法,通过丹磺酰氯衍生后,采用配有紫外检测器的高效液相色谱仪测定。结果表明,在p H 6.5时,组胺、腐胺、尸胺的降解率达到最大值,分别为23.76%,25.82%,23.76%。在37℃条件下,组胺、腐胺、尸胺的降解率分别为23.02%,24.22%,23.02%。乙醇体积分数为2%时,组胺、腐胺、尸胺的降解率分别为23.68%,24.65%,21.89%。NaCl质量分数为2%时,对生物胺的降解率分别为23.77%,24.62%,21.89%。展开更多
基金theNationalNaturalScienceFoundationofChina (Nos.2 99730 2 4and 2 0 1730 35 ) ,theUniversityKeyTeacher’sFoundingProgramoftheMinistryofEducationofChina (No .30 0 6 )andtheNaturalScienceFoundationofShaanxiProvince (No .99H13)
文摘The aggregation of dansyl chloride (DNS-Cl) in acetone has been studied indetail by steady-state fluorescence techniques. It has been demonstrated that DNS-Cl is stable inacetone during purification and aggregation study processes. The aggregates are not solvolyzed inacetone, and do not take part in any chemical reactions either. It has been found that DNS-Cl tendsto aggregate even when its concentration is much lower than its solubility in acetone. Theaggregation is reversible, and both the aggregation and the deaggregation are very slow processes.Introduction of SDS has a positive effect upon the formation and stabilization of the aggregates.
文摘本研究通过测定不同pH值、温度、乙醇含量以及NaCl含量条件对组胺、腐胺、尸胺降解的影响,探究是否与菌种在相应条件下的生长状况有关。建立一种测定生物胺降解的高效液相色谱-紫外检测法,通过丹磺酰氯衍生后,采用配有紫外检测器的高效液相色谱仪测定。结果表明,在p H 6.5时,组胺、腐胺、尸胺的降解率达到最大值,分别为23.76%,25.82%,23.76%。在37℃条件下,组胺、腐胺、尸胺的降解率分别为23.02%,24.22%,23.02%。乙醇体积分数为2%时,组胺、腐胺、尸胺的降解率分别为23.68%,24.65%,21.89%。NaCl质量分数为2%时,对生物胺的降解率分别为23.77%,24.62%,21.89%。