共查询到19条相似文献,搜索用时 78 毫秒
1.
2.
为简化双液相溶剂浸出棉仁的流程,探讨了应用饱和甲醇的己烷溶液一步脱除棉仁中棉油和棉酚的可行性,并用串级试验进行了验证。结果表明此设想是可行的。在浸出温度 50℃、4级浸取、溶剂与棉仁比值 8. 7L/kg的条件下,棉粕中残油质量分数低于 1. 3%,游离棉酚和结合棉酚含量可分别低于 450mg/kg和4 000mg/kg,达到了饲料标准。 相似文献
3.
采用平衡法测定了278.15~313.15 K甘氨酸在纯水及丙酮-水混合溶剂中的溶解度;采用Apelbla t经验方程和(CNIBS)/Redlich-Kister方程分别对甘氨酸在纯水和丙酮-水体系中的溶解度数据进行了关联,并对(CNIBS)/Redlich-Kister方程进行了温度影响分析。结果表明,甘氨酸在纯水中的溶解度随着温度的升高而增大;甘氨酸在丙酮-水混合溶剂中的溶解度随着丙酮与水的质量比的增加而变小;当丙酮与水的质量比达到实验中最大值即4时,甘氨酸的溶解度接近于0;在相同丙酮与水的质量比下,甘氨酸的溶解度随着温度升高而有所增大。甘氨酸在纯水及丙酮-水混合溶剂中的溶解度模型关联的标准方差均能达到1×10-4,精度满足工程需要。实验数据及相应模型为甘氨酸结晶过程分析和设计提供了重要依据。 相似文献
4.
5.
6.
7.
2甲-基吡啶在丙酮-水混合溶剂中的电氧化 总被引:2,自引:0,他引:2
在质子交换膜为隔膜的电解槽内,以2甲-基吡啶为原料,在丙酮/水混合溶剂中,以PbO2为阳极,电氧化合成了2-吡啶甲酸。通过循环伏安、线性扫描伏安和恒电位电解实验,考察了丙酮与水体积比、反应温度、硫酸浓度、反应物2-甲基吡啶浓度和阳极电位对选择性和电流效率的影响。结果表明,V(丙酮)∶V(水)=3∶1,硫酸浓度1.0~1.2 mol/L,2甲-基吡啶浓度0.5 mol/L,温度30℃,阳极电位1.75~1.80 V,生成2吡-啶甲酸的选择性可达88.7%,电流效率达到48.3%。而在纯水作溶剂的溶液中,相同条件下生成2-吡啶甲酸的选择性和电流效率仅分别为67.4%和42.2%。 相似文献
8.
9.
10.
11.
A variety of aluminas (acidic, basic, and neutral), silica, and synthetic magnesium silicates were screened to evaluate their
potential use as adsorbents,for reducing the content of gossypol and related compounds from hexane-based cotton-seed miscella.
Among the tested adsorbents, one type of silica and two types of magnesium silicate with a relatively high Brunauer-Emmet-Teller
(BET) surface area (≥240 m2/g) showed a superior adsorption capacity in reducing gossypol from hexane miscella. As a possible regenerating method for
the spent adsorbents, washing with acetone was tested. The effect of pH in the washing solvent was also evaluated. Adsorbents
that were regenerated by washing with acetone at pH values between 7 and 7.5 performed better than those at pH values between
6.5 and 7. The pH values of washing solvent were adjusted by using a small amount of caustic and 1 M HCl. 相似文献
12.
《分离科学与技术》2012,47(15):2035-2046
Abstract Three different varieties of cottonseed (S1, S2, and S3) were dehulled, separated, and defatted by hexane extraction under controlled conditions (moisture < 3%, temperature < 50°C). The defatted flours, designated as CS1 and CS2 (glandless) and CS3 (glanded), which had free-gossypol levels of 0.15, 0.28, and 0.68%, respectively, and protein levels of 61.4, 61.7, and 58.5%, respectively, were taken for aqueous extraction using NaOH as the alkali in the presence of Na2S2O4, a reducing agent. The extract, after centrifugation, was immediately taken for ultrafiltration (UF) using polysulfone membranes, followed by diafiltration (DF). Experiments at 40 and 60°C, to examine the UF performance and gossypol binding effect, were carried out with strict control of the feed pH. The intensely yellow-colored permetes, probably due to alkali-soluble sodium gossypolate and gossypol-like pigments, were checked for color intensity as a qualitative measure in ultrafiltration concentrate. The intensity was found to be on the decline, less during UF and more during diafiltration. The final UF/DF dried products were analyzed for free gossypol (FG), bound gossypol (BG), total gossypol (TG), and protein. Protein isolates (PI) from Samples CS1 and CS2 were found to have very low FG, with little effect of the processing conditions on binding of gossypol with the protein. PI from Sample CS3 was found to have slightly high FG with relatively high BG. The effect of temperature was found to result in high permeation rates without much effect on the rejection of the components and the binding of gossypol. The gossypol and protein contents of three UF/DF dried proteins were 0.006, 0.012, and 0.041% FG, and 89.4, 90.1, and 86.4% protein. The colors of PI from Samples CS1 and CS2 were lighter while PI from Sample CS3 was relatively darker. 相似文献
13.
A solvent system, consisting of isohexane and 5 to 25% alcohol, either ethanol (EtOH) or isopropyl alcohol (IPA), was tested
for extracting gossypol and oil from cottonseed. The test results indicate that this new solvent system not only is effective
in removing free and total gossypol but also is as efficient as n-hexane when extracting oil. The amino acid analysis of cottonseed meal, produced by the new solvent system, is similar to
that produced by commercial n-hexane. Present commercial cottonseed extraction and downstream processing of cottonseed oil refining may need little change
to adopt this new solvent system. This new solvent system may lead to a solution to the gossypol problem of cottonseed extraction. 相似文献
14.
研究采用高效液相色谱法测定食用植物油中游离棉酚的方法,最佳色谱条件:色谱柱C18柱,流动相为甲醇-磷酸溶液(1%)=84+16,波长240 nm,流速为1.0 mL/min,柱温30℃。曲线方程y=3.1033×10-5x,相关系数r=0.999871,线性关系良好。检出限为2.5 mg/kg,回收率为98.0%~100.2%。该法简便,快速,准确性高,重现性好。 相似文献
15.
16.
棉酚开发,应用的若干问题 总被引:7,自引:0,他引:7
结合棉酚的物理、化学性质就其提取、应用作一个综合的概括,讨论了作者在提取和精制中所遇到的若干问题。这些问题的解决,定会推进棉酚这一宝贵天然资源的合理开发与充分利用。 相似文献
17.
18.
Chee Fan Tan Soon Hong Kwan Chun Shing Lee Yan Ni Annie Soh Ying Swan Ho Xuezhi Bi 《International journal of molecular sciences》2022,23(17)
Cottonseed meal (CSM) is a good source of dietary proteins but is unsuitable for human consumption due to its gossypol content. To unlock its potential, we developed a protein extraction process with a gossypol removal treatment to generate CSM protein isolate (CSMPI) with ultra-low gossypol content. This process successfully reduced the free and total gossypol content to 4.8 ppm and 147.2 ppm, respectively, far below the US FDA limit. In addition, the functional characterisation of CSMPI revealed a better oil absorption capacity and water solubility than pea protein isolate. Proteome profiling showed that the treatment improved protein identification, while SDS-PAGE analysis indicated that the treatment did not induce protein degradation. Amino acid analysis revealed that post-treated CSMPI was rich in branched-chain amino acids (BCAAs). Mass spectrometry analysis of various protein fractions obtained from an in vitro digestibility assay helped to establish the digestibility profile of CSM proteins. Several potential allergens in CSMPI were also found using allergenic prediction software, but further evaluation based on their digestibility profiles and literature reviews suggests that the likelihood of CSMPI allergenicity remains low. Overall, our results help to navigate and direct the application of CSMPIs as alternative proteins toward nutritive human food application. 相似文献
19.