我国保健食品原料的特点及安全学问题

我国保健食品有悠久的历史,尤其是以含有中药以及药食两用原料为主研制而成的具有中医特色的保健食品在我国养生保健中发挥着越来越重要的作用。因此,这类原料的安全性已成为十分重要的食品安全问题,现就我国保健食品原料的特点及安全学问题作一综述。     

磁性功能材料应用于食品中有毒有害物质检测的研究进展

磁性固相萃取是近年来不断发展的一种样品前处理技术,而磁性功能材料作为磁性固相萃取的吸附剂,由于其独特的物理和化学特性引起广泛关注。本文总结分析了2010年以来磁性功能材料在食品中农药、兽药、合成色素、及其他有毒有害物质检测应用方面的研究进展,以期为食品安全检测新技术的推广应用提供参考。     

Native casein micelles as nanocarriers for β‐carotene: pH‐and temperature‐induced opening of the micellar structure

To apply native casein micelles (CM) as nanocarriers for lipophilic substances in non‐ or low‐fat food products, they have to be conditioned before loading. In this study, an experimental set‐up for the production and loading of CM was developed. Microfiltration was used to separate CM from skimmed milk. To identify optimal loading conditions temperatures (2, 20, 40 °C), pH values (6.8 and 5.5) and holding times (5, 15, 30, 60 min) were varied. The release of calcium, phosphate and protein from the micellar phase as well as static light scattering and transmission electron microscopy showed that CM were optimally primed at 2 °C and a pH of 5.5 for 5 min. Therefore, loading with β‐carotene was performed under those conditions. After the back‐extraction of β‐carotene, the photometrical analyses revealed total recovery rates of >79% whereby 94% of it was associated with the native CM.