The Heart Research Institute, 7 Eliza Street, Newtown, NSW 2042, Australia; Faculty of Medicine, University of Sydney, Sydney, NSW 2006, Australia.
Cargill, Inc., 15407 McGinty Road West, Wayzata, MN 55391, USA.
Food Chem. 2015 Apr 15;173:645-51. doi: 10.1016/j.foodchem.2014.10.054. Epub 2014 Oct 18.
Exposure of the naturally-occurring sweetener monatin to light and metal ions results in loss of both parent monatin and total indole (monatin plus monatin lactone/lactam) in mock beverage solutions, with an accompanying decrease in sweetness. In this study potential protective strategies to prevent degradation were investigated. Metal ion chelating resin, or the chelators EDTA and desferrioxamine decreased monatin and indole loss for solutions kept either in darkness or exposed to light. Tannic acid and Chinese bayberry extract both afforded protection, but this did not arise from a light filtering effect. Plastics with defined absorbance characteristics provided protection with this being wavelength dependent; yellow transparent PET plastic was most effective. The contribution of these interventions (metal ion removal/binding; antioxidant; light absorption) was additive, with combinations providing the greatest protective effect against monatin and indole loss. These results indicate that it is possible to minimise monatin degradation by appropriate choices of treatments, additives and container.
天然甜味剂莫纳亭暴露于光和金属离子会导致模拟饮料溶液中母体莫纳亭和总吲哚（莫纳亭加莫纳亭内酯/内酰胺）的损失，同时甜度降低。在这项研究中，研究了潜在的保护策略以防止降解。金属离子螯合树脂或螯合剂 EDTA 和去铁胺可减少黑暗或暴露于光下的溶液中莫纳亭和吲哚的损失。单宁酸和杨梅提取物都提供了保护，但这不是由于光过滤效应。具有明确定义的吸光特性的塑料提供了保护，这种保护作用取决于波长；黄色透明 PET 塑料最有效。这些干预措施（金属离子去除/结合；抗氧化剂；光吸收）的贡献是累加的，组合提供了对莫纳亭和吲哚损失的最大保护效果。这些结果表明，通过适当选择处理方法、添加剂和容器，可以最小化莫纳亭的降解。
