高效液相色谱同时测定食品中5种添加剂

[目的]建立高效液相色谱(HPLC)同时测定食品中安赛蜜、糖精钠、苯甲酸、山梨酸和阿斯巴甜的方法。[方法]样品经去蛋白、脱色、超声提取、过滤膜等预处理,采用HPLC二极管分段多波长同时测定。[结果]方法线性良好,相关系数为0.9995~0.9999,回收率为90.70%~98.20%,相对标准偏差为0.41%~2.40%。[结论]方法准确可靠、简便快速、易于掌握、便于推广。     

高效液相色谱法测定食品中阿斯巴甜的含量

目的：建立测定各类食品中阿斯巴甜含量的系统分析方法。方法：对不同类别的食品采用针对性的前处理手段,选择C18柱和甲醇/水流动相作为分离条件,在208 nm波长处进行检测。结果：方法的最低检出限为2 mg/kg,平均回收率为96.0%～98.9%,相对标准偏差为3.0%～6.1%。结论：方法简单快速,能适用于各类成分复杂的食品的定性定量分析。     

高效液相色谱法多波长同时检测饮料中的5种食品添加剂

[目的] 探讨高效液相色谱法(HPLC)多波长同时检测食品饮料中的乙酰磺胺酸钾、天门冬酰苯丙氨酸甲酯、糖精钠、苯甲酸和山梨酸的方法。[方法] 利用二极管阵列检测器(DAD)的程序波长功能,分别用各待测组分的最佳检测波长在优化的色谱条件下同时检测。[结果] 该法线性良好,相关系数≥0 9995,回收率在91 3%~98 3%之间,RSD<2 5%,各待测组分的峰面积较单一波长法大为提高。[结论] 与单一波长法相比,高效液相色谱法可提高检测的灵敏度,结果准确,操作简单方便。     

The hydration/dehydration behavior of aspartame revisited

Aspartame, l-aspartyl-l-phenylalanine methyl ester, has two hydrates (IA and IB), a hemi-hydrate (IIA) and an anhydrate (IIB). The hydration/dehydration behavior of aspartame was investigated using hot-humidity stage X-ray powder diffraction (XRPD) and molecular mechanics modeling in combination with differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The results of this study are compared to earlier studies on aspartame as described in literature. It is shown that earlier transition studies were hampered by incomplete conversions and wrong assignment of the forms. The combination of the techniques applied in this study now shows consistent results for aspartame and yields a clear conversion scheme for the hydration/dehydration behavior of the four forms.     

Genotoxicity of Aspartame

In the present study, the genotoxic effects of the low‐calorie sweetener aspartame (ASP), which is a dipeptide derivative, was investigated using chromosome aberration (CA) test, sister chromatid exchange (SCE) test, micronucleus test in human lymphocytes and also Ames/Salmonella/ microsome test. ASP induced CAs at all concentrations (500, 1000 and 2000 µg/ml) and treatment periods (24 and 48 h) dose‐dependently, while it did not induce SCEs. On the other hand, ASP decreased the replication index (RI) only at the highest concentration for 48 h treatment period. However, ASP decreased the mitotic index (MI) at all concentrations and treatment periods dose‐dependently. In addition, ASP induced micronuclei at the highest concentrations only. This induction was also dose‐dependent for 48 hours treatment period. ASP was not mutagenic for Salmonella typhimurium TA98 and TA100 strains in the absence and presence of S9 mix.     

Soft drinks consumption and nonalcoholic fatty liver disease

Nonalcoholic fatty liver disease(NAFLD) is a common clinical condition which is associated with metabolic syndrome in 70% of cases.Inappropriate dietary fat intake,excessive intake of soft drinks,insulin resistance and increased oxidative stress combine to increase free fatty acid delivery to the liver,and increased hepatic triglyceride accumulation contributes to fatty liver.Regular soft drinks have high fructose corn syrup which contains basic sugar building blocks,fructose 55% and glucose 45%.Soft drinks...     

化学－酶法合成甜味天苯二肽

为探索天－苯甜二肽生产新技术，以马来酐与Ｌ－苯丙氨酸甲酯为原料经化学法缩合成马来酰－Ｌ－丙氨酸甲酯，并将后者异构化成富马酰－Ｌ－苯丙氨酸甲酯（ＦＰＭ），收率９５％；再以ＦＰＭ及氨或氨供体为底物，经Ｅ．ｃｏｌｉＣＰＵ８９０１转化为天－苯甜二肽，产物浓度为５．６ｍｇ／ｍｌ。     

HPLC法测定小儿氨酚黄那敏颗粒中阿斯帕坦的含量

摘 要 目的：建立小儿氨酚黄那敏颗粒中阿斯帕坦的高效液相色谱测定方法。方法: 采用AgiLent Zorbax SB-C₁₈（250 mm×4.6 mm,5 μm）色谱柱,以乙腈-0.05 mol·L^-1磷酸（20∶80）为流动相,流速为1.0 ml·min^-1,检测波长为204 nm,柱温为25℃,进样量为10 μl。结果: 阿斯帕坦在21.72～868.67 μg·mL^-1浓度范围内呈良好的线性关系（r=1.000 0）,平均回收率为99.36%（RSD=0.3%,n=6）。结论:该方法稳定性和重复性均较好,可用于测定小儿氨酚黄那敏颗粒的质量控制。     

Aspartame-fed zebrafish exhibit acute deaths with swimming defects and saccharin-fed zebrafish have elevation of cholesteryl ester transfer protein activity in hypercholesterolemia

Although many artificial sweeteners (AS) have safety issues, the AS have been widely used in industry. To determine the physiologic effect of AS in the presence of hyperlipidemia, zebrafish were fed aspartame or saccharin with a high-cholesterol diet (HCD). After 12 days, 30% of zebrafish, which consumed aspartame and HCD, died with exhibiting swimming defects. The aspartame group had 65% survivability, while the control and saccharin groups had 100% survivability. Under HCD, the saccharin-fed groups had the highest increase in the serum cholesterol level (599 mg/dL). Aspartame-fed group showed a remarkable increase in serum glucose (up to 125 mg/dL), which was 58% greater than the increase in the HCD alone group. The saccharin and HCD groups had the highest cholesteryl ester transfer protein (CETP) activity (52% CE-transfer), while the HCD alone group had 42% CE-transfer. Histologic analysis revealed that the aspartame and HCD groups showed more infiltration of inflammatory cells in the brain and liver sections.Conclusively, under presence of hyperlipidemia, aspartame-fed zebrafish exhibited acute swimming defects with an increase in brain inflammation. Saccharin-fed zebrafish had an increased atherogenic serum lipid profile with elevation of CETP activity.     

Modified sham feeding of sweet solutions in women with anorexia nervosa

Anorexia Nervosa (AN) is a disorder of self-starvation characterized by decreased meal size and food intake. While it is possible that reduced food intake in AN reflects an excess of inhibitory factors, e.g., cognitive inhibition related to fear of weight gain or abnormal postingestive negative feedback, it is also possible that decreased intake reflects diminished orosensory stimulation of food intake. This has been difficult to test directly because the amount of food ingested during a test meal by patients with AN reflects an integration of orosensory excitatory, and cognitive, learned, and postingestive inhibitory controls of eating. To begin to dissociate these controls, we adapted the modified sham feeding technique (MSF) to measure the intake of a series of sweetened solutions in the absence of postingestive stimulation. Subjects with AN (n = 24) and normal controls (NC, n = 10) were randomly presented with cherry Kool Aid® solutions sweetened with five concentrations of aspartame (0, 0.01, 0.03, 0.08 and 0.28%) in a closed opaque container fitted with a straw. They were instructed to sip as much as they wanted of the solution during 15 1-minute trials and to spit the fluid out into another opaque container. Subjects with AN sipped less unsweetened solution than NC (p < 0.05). Because this difference appeared to account completely for the smaller intakes of sweetened solutions by AN, responsiveness of intake to sweet taste per se was not different in AN and NC. Since MSF eliminated postingestive and presumably cognitive inhibitory controls, and the orosensory response to sweet taste was not different in AN than NC, we conclude that decreased intake by AN subjects under these conditions reflects the increased inhibition characteristic of this disorder that is presumably learned, with a possible contribution of decreased potency of orosensory stimulation by the sipped solutions.