Influences of different carbohydrates as wall material on powder characteristics,encapsulation efficiency,stability and degradation kinetics of microencapsulated lutein by spray drying

In the present study, seven carbohydrates were selected as encapsulant for preparing lutein microencapsulated powders (LMPs). The surface morphology, physical properties, encapsulation efficiency, and thermo- and storage stability of LMPs were studied to determine the protective effects of different carbohydrates on microencapsulated lutein during spray drying and storage. Results on powder characteristics indicated that the crystal inhibition of wall material in spray drying was necessary for decent encapsulation efficiency, and higher glass transition temperature of wall material could cause high product yield. In stability assessment, degradation kinetics of different LMPs at two different temperature conditions were analysed, revealing that inulin could provide more effective protection compared with the other carbohydrate. Our results suggested that the different carbohydrates had great influence on the quality of LMPs, and inulin could be considered as an alternative for the generation of LMPs to enhance storage stability and extend shelf life of this bioactive product.     

Reversibility of electrochemical magnesium deposition from tetrahydrofuran solutions containing pyrrolidinyl magnesium halide

In this paper we reported for the first time the electrochemical behavior of pyrrolidinyl magnesium halide (C₄H₈NMgX, X = Br and Cl) dissolved in tetrahydrofuran (THF) with regard to potential application as electrolytes for rechargeable magnesium batteries. C₄H₈NMgX/THF solutions were characterized in term of conductivity, anodic stability, and reversibility of magnesium deposition and dissolution. Furthermore, the effect of metal substrates on magnesium deposition process was studied. Simple preparation, high cycling reversibility and moderate anodic stability of C₄H₈NMgBr/THF solution indicate the feasible application as the electrolyte for rechargeable magnesium batteries.     

利用制浆废料和废液制缓冲包装材料的研究

研究了以玉米秆髓为原料、碱性亚硫酸盐蒽醌法制浆废液为胶粘剂制备缓冲包装材料，结果表明：影响玉米秸秆缓冲包装材料性能的因素主要有胶粘剂用量、模压压力、废液固形物含量、髓粒径以及制备时是否采取加压干燥手段等。通过调整这些相关因素可以获得具有不同缓冲性能的包装材料，进而能够满足不同包装产品的要求，用以代替EPS泡沫塑料包装工业产品。     

RGO-ZnFe2O4的制备及光Fenton反应降解罗丹明B

采用高能超声复合法制备RGO-ZnFe₂O₄,在模拟太阳光下评价其催化光Fenton反应性能。通过XRD、TEM、FTIR和漫反射光谱分析催化剂的形貌和理化特性。结果表明,RGO的加入可增强ZnFe₂O₄的光吸收能力。以罗丹明B溶液为模拟染料废水,降解率为评价指标,探究RGO掺杂量、催化剂用量和H2O2浓度对降解效果的影响。结果表明,RGO掺杂量6%、催化剂用量1 g/L、H2O2浓度20 mmol/L时,光Fenton降解罗丹明B效果最好,60 min后的降解率达到88.6%。     

Development of a sensitive competitive indirect ELISA method for determination of ochratoxin A levels in cereals originating from Nanjing,China

A monoclonal antibody against ochratoxin A (OTA) was produced and a simple, rapid and reliable competitive indirect ELISA (ci-ELISA) for detection of OTA was developed. The 50% inhibitory concentration (IC₅₀) was 1.70 ng/mL, with a detectable range of 0.55–6.75 ng/mL, and a limit of determination (LOD) at 0.15 ng/mL. The cross-reactivity of the antibody against ochratoxin B was 17%, and <10% against deoxynivalenol, fumonisin B₁ or aflatoxin B₁. A survey of 65 cereal samples was carried out in Nanjing, the capital of Jiangsu Province, China. The frequencies of OTA contamination were 36.36%, 26.08% and 15.00%, and the mean concentrations of positive samples were 4.248 ng/g, 7.360 ng/g and 3.382 ng/g for wheat, corn and rice, respectively. The results of this study suggest that the ci-ELISA developed can be used to determine OTA in agricultural commodities such as cereals, and a survey might be needed to investigate OTA contamination in food and feed to prevent their harmful health effects.     

基于STM32的便携式福氏志贺菌检测仪

福氏志贺菌的检测需要专业设备和特定的实验室条件才能进行,而且数天才能得出结果。本文利用主控器STM32发出信号控制三电极传感器,使其促进溶液中样品发生电化学反应,从而产生与福氏志贺菌浓度相关的电流,经三电极传感器采集,处理后传回STM32,最终在液晶屏上显示福氏志贺菌的浓度值。该研究对福氏志贺菌的快速检测具有重要意义。     

基于B/S结构的嵌入式系统测试平台及其应用

在对现有嵌入式系统测试平台进行分析后,设计并实现了一个基于B/S结构的通用嵌入式系统测试平台框架,以提高嵌入式系统测试的准确性和效率.该平台在服务器端开发和集成测试工具,在浏览器端布置测试环境实施测试.基于该平台,分别设计了嵌入式操作系统实时性、健壮性和一致性的测试方案,以及上海城市轨道交通自动售检票系统终端设备的嵌入式系统的功能、效率等测试方案,并加以实施,获得了一批有价值的数据;为开发方工作的完善和使用方的设备验收提供了科学的依据.     

保护地升麻栽培与食用价值

为了深入挖掘兴安升麻生理功能,本研究采用醇提法提取活性成分,通过HPLC-MS分析兴安升麻的化学成分并基于网络药理学探讨其对皮肤伤口的促愈机制。结果表明,兴安升麻中鉴定出125种化学成分,其中萜类、苯丙素类及酮类化合物含量较多,主要包括隐绿原酸、绿原酸、白术内脂III等活性成分,可作用于一个或多个靶点, EGFR、KDR、F2可能为促愈过程中发挥作用的重要靶点,且橘皮素、山姜素、5-去甲川陈皮素等活性成分可能在此过程中发挥重要作用,说明兴安升麻具有多成分、多靶点作用于促进皮肤伤口愈合的特性;兴安升麻可能通过VEGF、EGFR和TNF信号通路调控相关因子和蛋白的表达,发挥对皮肤伤口的促愈作用。本研究探明了兴安升麻醇提物的主要活性成分,并基于网络药理学预测了促进皮肤伤口愈合的作用机制,为后续兴安升麻的开发利用提供试验及理论基础。