HCS-g-MMANHNH_2富集火焰原子吸收法测定水中铜铅锌

交联淀粉接枝共聚物作为重金属离子的吸附剂用于废水处理的研究工作,近年来已有一些报导。本文讨论了改性淀粉对铜铅锌的吸附条件,对水中铜铅锌进行了富集测定。 1 仪器与试剂 WYX-402型原子吸收分光光度计(沈阳分析仪器厂);铜、铅、锌空心阴极灯(北京有色金属研究院);自制玻璃柱(高15cm,内径1cm),上端成布氏漏斗状,下端拉成内径0.7cm细管。 铜的标准储备液:准确称取分析纯的Cu(NO_3)_2·3H_2O 3.8047g,用二次去离子水溶解并定     

改性玉米淀粉保水剂的研制

提供了一种价格较便宜的保水剂，对其合成原理、配方设计、工艺条件进行了研究与选择，具有很好的实用性和理论研究价值。     

硝酸铈按分光光度法测定淀粉水解DE值

研究了测定淀粉水解ＤＥ值的分光光度法，对该法的测定原理、测定条件、结果的准确度等作了系统的实验研究，并经在线检验的验证．结果证明，该法操作简单、快速、成本低、测量范围广，重现性好，具有广泛的推广价值。     

Effect of Starch Sources on the Release Rates of Herbicides Encapsulated

The effects of starch sources on the behaviors of starch matrices and on the rates of herbicides released from the matrices were studied for slow release. The starches considered include native corn starch, wheat starch, potato starch and cassava starch. The matrices were prepared through encapsulating 2,4-dichlorophenoxyacetic or 2,4,5 trichlorophenoxyacetic acids as model herbicides with hot-gelatinized starch pastes. The encapsulation was evaluated in terms of herbicide content, swellability, encapsulation efficiency, and release rate. The results show that starch sources play an important role on the matrix behaviors and on release rates. The rate of 2,4-D released follows the order： wheat starch 〈 potaot starch 〈 corn starch 〈 cassava starch. And for the rate of 2,4,5-T, this order is nearly the same only with an exception that the late two kinds of starch are similar. It is also demonstrated that herbicides with different water solubility show different release rates, no matter what type of starch is used as the matrices.     

包装用热塑性淀粉发泡材料的研究

通过正交分析 ,探讨了淀粉基发泡材料的性能影响因素 ,获得了淀粉基发泡材料的最佳配方以及最大影响因素 ,并对不同的因素进行了分析探讨 ,制备的材料密度在 0 .2 g/cm3以下 ,回弹率可达 75 % ,韧性和外观等方面均能满足一定要求     

密闭微波酸水解法测定食品中淀粉含量

介绍一种利用微波技术在密闭容器内对食品中淀粉加酸微波水解的新方法.微波是一种频率介于300～300000MHz之间的电磁波,利用微波水解淀粉时,在高频电磁场作用下,分子之间热运动加剧,从而产生能量,在酸性条件下,达到充分水解的目的.这种方法与常规法对比,具有省时快捷、测定效率高等优点,值得推广.     

可生物降解高吸水材料的制备以及制备工艺对吸水倍率的影响

以淀粉为原料，采用反相悬浮聚合方法，通过研究交联反应时反应时间、搅拌速度、反应温度以及催化剂质量分数、交联剂质量分数、淀粉质量分数和分散剂质量分数一系列工艺条件制备出可完全生物降解的高吸水材料，通过测定高吸水材料的吸水倍率揭示出制备工艺对可生物降解高吸水材料吸水倍率的影响规律。     

新疆蜗牛酶的研制

以野生蜗牛嗉囊为原料提取蜗牛酶产品,检测所含纤维素酶、淀粉酶的活性,对其蜗牛酶产品进一步测试,结果表明新疆蜗牛酶中的纤维素酶活力为450U/g淀粉酶为405U/g。验证了新疆蜗牛酶中纤维素酶的活力很高。     

Impedance Studies on Starch-NH_4NO_3 Films

1 Results Starch is considered a suitable source material because of its inherent biodegradability,ready viability and relatively low cost[1].In the present work,polymer electrolytes based on starch have been prepared by the solution cast technique.The conductivity of the films is characterized using impedance spectroscopy at room temperatures.The imaginary impedance (Zi) versus real impedance (ZR) plot of pure starch films consists of a semicircle.The bulk resistance (Rb) was taken from the intercept o...     

Dialdehyde starch nanoparticles： Preparation and application in drub carrier

Dialdehyde starch nanoparticles (DASNP) were prepared by the redox reaction of NaIO4 and starch in water-in-oil microemulsion. IR spectrum showed that DASNP had aldehyde groups, and quantitative alkali consumption showed that its dialdehyde content was about (50±5)%. The average diameter of DASNP determined by SEM was about 100 nm. TGA-DTA showed that its thermal stability was better than starch nanoparticle (StNP) and dialdehyde starch (DAS). Its low biological toxicity was detected by cell experiment. Also the best mass ratio of doxorubicin (DOX) to combined DASNP detected by UV-VIS was 15 : 1, and the product was effective for controlled release of DOX. The cell experiment showed that the drug-carrier particle (DOX-DASNP) can release DOX for a long time and strengthened the effect of the anticancer drug. This work demonstrates that the DASNP, which has good thermal stability, small particle size, low biological toxicity, and slowly anticancer drug-releasing to strengthen drug effect, is a potentially useful carrier for anticancer drug.