100%苹果汁的营养成分分析与评价

以甘肃省天水市100%苹果汁为原料,参照国家标准检测方法,对其常规营养成分、矿物质、维生素及活性成分进行了测定。结果显示,该苹果汁饮料富含钾、镁和磷等矿物质元素以及维生素C和B6,并含有诸多功能性成分如苹果酸和单宁。本研究证明,该产品具有一定的营养保健作用,为其进一步开发和推广提供了依据。     

Erythrocyte Toxicities of Imidazolidinyl Urea and Diazolidinyl Urea

The addition of antimicrobial preservatives to pharmaceutical and cosmetic products is necessary to prevent microbial growth. However, the use of preservatives can also produce other undesirable effects. For several years, researchers have been investigating the use of alternative methods in safety assessment of cosmetic ingredients and formulations by means of variety methods. The aim of this study was to evaluate the erythrocyte toxicities of two commercial preservatives： imidazolidinyl urea and diazolidinyl urea. Relatively few studies about the cytotoxicity of these preservative are available. The determination of their cytotoxicity is an essential step to warrant their safe use. Erythrocyte toxicities were evaluated by assessment of the amount of hemoglobin released by red blood cells after their lysis. In this study, both imidazolidinyl urea and diazolidinyl urea showed cytotoxic activity against red blood cells. The imidazolidinyl urea induce a small release of hemoglobin after 120 min of incubation. But, the diazolidinyl urea induce a massive release of hemoglobin from the imidazolidinyl urea （a rate of 83% at concentrations of 6.25 mg/mL and 12.5 mg/mL）.     

基于人工神经网络的主机安全量化评估研究

基于人工神经网络的方法对主机安全性能进行量化评估。分析了BP人工神经网络模型的网络结构及学习算法,分析了影响目标主机安全性能的可能因素,并应用BP神经网络模型对目标主机的安全性能进行样本训练及实际测试。基于人工神经网络的主机安全量化评估为评价目标主机的安全性能提供了可行的方法。     

多光子成像技术及其在化妆品评估中的应用

多光子成像技术是一种观察人体皮肤组织结构的光学成像方法,其原理是利用不同波长的近红外激光使皮肤组织中特定的内源性或外源性荧光物质发出不同的荧光信号,从而观测、区分皮肤不同层的特定组织结构.近年来,该方法开始逐步应用于化妆品的评估中,如评估化妆品紧致抗皱、祛斑美白、透皮吸收的效果等.多光子成像技术能够通过监测皮肤形态或代谢的变化评估化妆品紧致抗皱的作用、定量黑色素分布和含量评估化妆品祛斑美白成分的功效性或判断特定皮肤的类型、可视化化妆品成分透皮吸收的过程评估其功效性或安全性.该方法获得的客观、可视化图像可以为化妆品评估提供定量的数据结果,在皮肤成像领域有着广阔的应用前景,本文综述了这种在体、无创、精准的三维成像方法在化妆品评估中的应用和进展.