麦胚中总黄酮的提取新工艺研究

研究了利用乙醇提取麦胚总黄酮及微波辅助萃取的方法提高麦胚黄酮的提取率。     

凉州熏醋的生产技术

借鉴山西老陈醋的生产工艺,利用玉米、大麦、青稞、豌豆等原料,生产出有地方特色的熏醋。     

超临界CO2流体从玉米胚芽中萃取LA的研究

采用超临界CO2流体萃取技术从玉米胚芽中萃取亚油酸（LA）,研究了萃取压力、温度、萃取时间和CO2流量对油脂中亚油酸萃取率的影响,优化了萃取工艺条件;萃取压力25MPa,温度45℃,时间80min,CO2流量25L/h,并利用气相色谱对最佳条件下玉米胚芽油中亚油酸进行定性定量分析。     

软包装榨菜的超高压杀菌工艺研究

采用正交试验设计研究了超高压处理对榨菜杀菌效果以及理化指标的影响。结果表明,超高压工艺对榨菜的脆度影响很小,杀菌的优化工艺条件为:压力300 MPa,保压时间为20 min,中盐(8.5%)可以有效杀灭微生物,防止胖袋并且大肠菌群小于30个。     

菠菜色素提取方法的改进及稳定性研究

采用有机溶剂浸泡法和超声波辅助技术从菠菜叶中提取色素,比较两者的提取效率,并对其在pH、光照、温度、氧化剂、还原剂、常见金属离子及食品添加剂等条件下的稳定性进行了研究。结果表明:菠菜色素的最佳提取工艺条件:提取剂,乙醇;料液比(g:mL),1:5;提取温度,50℃;提取时间,60 min;超声波功率,200W;色素在酸性条件下相对稳定;K~+、Na~+、Ca~(2+)、温度的变化,氧化剂、还原剂及食品添加剂的加入对色素的影响不大;其耐光性比较差。     

甜玉米饮料的研制

以甜玉米为原料,采用α-淀粉酶、糖化酶酶解工艺,水解甜玉米中的淀粉,生产出澄清透明、具有甜玉米特有香味的澄清型甜玉米饮料,并研究了混浊型甜玉米饮料的加工工艺和稳定性,从而确定了产品的工艺方案。     

计算负反馈放大器电压放大倍数的一种新方法

将负反馈放大器视为三端口网络,写出多端口网络的网络方程,并导出一种分析计算负反馈放大器电压放大倍数的新方法。结合两道例题,详细说明了该方法的解题步骤。     

蚕丝上浆工艺研究及生产实践

优化蚕丝的上浆配方及工艺参数。分析了蚕丝的结构特点,设计了两种浆料配方,通过浆纱生产实践对比了两种浆料配方的浆纱效果和织造效果,并对压浆力、烘筒温度等工艺参数进行了优化,使蚕丝织物的织造效率达到94%。指出:蚕丝上浆宜选择成膜性好、粘着力强、粘度较低的亲水性浆料为主浆料,上浆时宜控制浆液的pH值为中性,烘筒温度不宜过高,应以提高经纱的耐磨性为主。     

Facile on-site detection of substituted aromatic pollutants in water using thin layer chromatography combined with surface-enhanced Raman spectroscopy

A novel facile method for on-site detection of substituted aromatic pollutants in water using thin layer chromatography (TLC) combined with surface-enhanced Raman spectroscopy (SERS) was explored. Various substituted aromatics in polluted water were separated by a convenient TLC protocol and then detected using a portable Raman spectrometer with the prepared silver colloids serving as SERS-active substrates. The effects of operating conditions on detection efficacy were evaluated, and the application of TLC-SERS to on-site detection of artificial and real-life samples of aromatics/polluted water was systematically investigated. It was shown that commercially available Si 60-F(254) TLC plates were suitable for separation and displayed low SERS background and good separation efficiency, 2 mM silver colloids, 20 mM NaCl (working as aggregating agent), 40 mW laser power, and 50 s intergration time were appropriate for the detection regime. Furthermore, qualitative and quantitative detection of most of substituted aromatic pollutants was found to be readily accomplished using the developed TLC-SERS technique, which compared well with GC-MS in terms of identification ability and detection accuracy, and a limit of detection (LOD) less than 0.2 ppm (even at ppb level for some analytes) could be achieved under optimal conditions. The results reveal that the presented convenient method could be used for the effective separation and detection of the substituted aromatic pollutants of water on site, thus reducing possible influences of sample transportation and contamination while shortening the overall analysis time for emergency and routine monitoring of the substituted aromatics/polluted water.     

冬瓜彩珠饮料的加工技术

以冬瓜为原料,采用纯天然物质着色,生产一种冬瓜彩珠饮料,彩珠均匀悬浮于饮料中,既具有一定的观赏性,又具有咀嚼性。