茶叶提取物的美白作用及其机理研究进展

茶叶是一种可以保健和预防人体疾病的健康食品,具有广泛的生物活性成分。整理归纳了近几年国内外茶叶美白功效的文献,从黑色素的合成过程、美白作用调节机理和茶叶提取物的美白作用三方面进行了综述,提出动物实验、病理学及毒理学等方面研究是未来开发茶叶提取物美白产品的研究方向,展望了茶叶美白产品的前景。     

白粉病对亚麻原茎和种子产量、质量的影响

2004-2006年通过对宾川县亚麻白粉病发病的6个级别进行多点取样调查的结果表明。白粉病发病程度对亚麻经济性状和产量、质量的影响较大。随着发病程度的上升，亚麻株高、工艺长度、单株重、千粒重相应下降，原茎色泽逐渐变差，1级、2级和3级优质原茎比例逐渐下降，严重影响亚麻原茎产量、质量、原茎均价及种子产量的提高，降低了亚麻的综合经济效益。     

桑树美白活性的研究进展

桑树提取物在皮肤美白、祛褐斑等美白护肤方面多有应用。本文针对两种皮肤美白机理，对桑树提取物及其活性物质皮肤美白活性研究进行综述，为后续的研究或开发利用提供参考。     

Sponges and Their Symbionts as a Source of Valuable Compounds in Cosmeceutical Field

In the last decades, the marine environment was discovered as a huge reservoir of novel bioactive compounds, useful for medicinal treatments improving human health and well-being. Among several marine organisms exhibiting biotechnological potential, sponges were highlighted as one of the most interesting phyla according to a wide literature describing new molecules every year. Not surprisingly, the first marine drugs approved for medical purposes were isolated from a marine sponge and are now used as anti-cancer and anti-viral agents. In most cases, experimental evidence reported that very often associated and/or symbiotic communities produced these bioactive compounds for a mutual benefit. Nowadays, beauty treatments are formulated taking advantage of the beneficial properties exerted by marine novel compounds. In fact, several biological activities suitable for cosmetic treatments were recorded, such as anti-oxidant, anti-aging, skin whitening, and emulsifying activities, among others. Here, we collected and discussed several scientific contributions reporting the cosmeceutical potential of marine sponge symbionts, which were exclusively represented by fungi and bacteria. Bioactive compounds specifically indicated as products of the sponge metabolism were also included. However, the origin of sponge metabolites is dubious, and the role of the associated biota cannot be excluded, considering that the isolation of symbionts represents a hard challenge due to their uncultivable features.     

基于多模型离散覆盖的宿州初霜期动态灰预测

初霜冻害是影响宿州市秋收作物收成的重要因素。根据季节事件灰预测和多模型离散覆盖机理,创建不同零起点的灾变子序列并建立多个GM(1,1)模型,按照灰关联度择优选模,利用新息或灰数依次递补,对初霜期10月23日出现年份进行预测。提出按照频次对多模型离散覆盖进行白化以确定最有可能出现的年份,经预报检验效果较好,对初霜期的长期预测有一定的参考价值。     

The Research Progress and Prospect Analysis of Germ-Remaining Rice Whitener

In this paper, the backdrop and significance of the research of germ-remaining rice whitener firstly were expatiated. Then, the study progress in China and overseas was summarized. Lastly, the research prospect of this kind of whitener in China was analyzed. It is hoped that it can coach the design of germ-remaining rice whitener.     

Effects of Whitening Agents and Frozen Storage on the Quality of Sardine (Sardina pilchardus) Surimi: Physicochemical and Mechanical Properties

This work is focused on the effect of using whitening agents (WA) during a process followed by frozen storage (4 months at ?18°C) on the whiteness, quality parameters, and mechanical properties of sardine surimi. The whiteness of surimi exhibited a significant improvement when whitening agents (calcium carbonate and peroxide hydrogen) were used (48.75 to 60.24). Dynamic rheological measurement showed that storage moduli, G′, was considerably higher than loss moduli, G″, for both surimi with WA and control; however, the highest viscoelastic moduli were found in the treated surimi. In addition, the microstructure of surimi with WA showed more compact matrix and higher water holding capacity. On the other hand, most tested indexes showed quality losses throughout the frozen storage in both samples. Proteins underwent denaturation as indicated by the reduction in band intensities, especially myosin heavy chain (MHC) bands. Peroxide value (PV) and thiobarbituric acid reactive substances (TBARS) measurements showed that lipid oxidation took place during storage; however, the degree of lipid oxidation was not relevant. Therefore, it was proved that the addition of whitening agents had a marked effect on the production of surimi with better functional attributes including whiteness, water holding capacity, and mechanical properties.     

卷烟包装材料中荧光增白剂的UPLC测定

建立了卷烟滤嘴接装纸、成型纸中荧光增白剂ABP、VBL检测的UPLC方法。样品采用N,N-二甲基甲酰胺超声提取30 min,采用ACQUITY UPLC BEH C18(50 mm×2.1 mm,1.7μm)色谱柱分离,用乙腈/水(V/V=20∶80,流速0.3 m L/min)混合液洗脱,荧光检测器检测。该法前处理简单,回收率高,精密度好,适用于卷烟滤嘴成型纸和接装纸荧光增白剂的测定。     

立式精碾米机机组的设计

立式精碾米机机组采用“一砂二铁”碾米流程,顺向和逆向砂、铁辊碾米多单机组合,无中间附加物流设备,采用喷风、低温升和喷风加湿碾米技术。在结构设计上,采用了独立的碾辊轴系,可分式碾辊及螺旋输送器结构,运转精度高、装拆维护方便和调整快捷。应用实践证明,该机组布局紧凑,性能良好,工作可靠。     

人参皂苷Rb_1美白功效的初步研究

通过体外蘑菇酪氨酸酶活性的检测,研究了人参皂苷Rb1对体外蘑菇酪氨酸酶的影响;通过细胞增殖率的测定,研究了人参皂苷Rb1对B16黑色素细胞增殖的影响。结果表明:不同浓度Rb1样品对于体外蘑菇酪氨酸酶的抑制率明显低于熊果苷(P0.1),抑制率均在±5%,说明人参皂苷Rb1对于体外蘑菇酪氨酸酶活性没有明显作用;人参皂苷Rb1对B16黑色素细胞增殖的影响随着浓度的变化而变化,当Rb1质量浓度125μg/mL时对B16黑色素细胞增殖有促进作用,125μg/mL时对B16黑色素细胞增殖有抑制作用。