以花生肽(相对分子质量<3.0 k D)为原料,以硫酸亚铁(Fe SO4·7H2O)为金属螯合剂,利用微波固相合成技术在单因素试验基础上,采取中心复合响应面法对花生肽亚铁配位螯合工艺进行了优化,建立了花生肽亚铁配位螯合工艺的二阶多项式...以花生肽(相对分子质量<3.0 k D)为原料,以硫酸亚铁(Fe SO4·7H2O)为金属螯合剂,利用微波固相合成技术在单因素试验基础上,采取中心复合响应面法对花生肽亚铁配位螯合工艺进行了优化,建立了花生肽亚铁配位螯合工艺的二阶多项式非线性回归方程和数值模型,分析了微波辐射时间、花生肽亚铁配体比和引发剂用量对花生肽亚铁配位螯合的影响。结果表明,最佳花生肽亚铁配位螯合工艺为:微波辐射时间153 s,花生肽亚铁配体比5∶1,引发剂(H2O)用量3%,微波辐射功率608 W,反应物粒径120目,2.5%白炭黑(占花生肽质量)为脱酸剂,0.3%异抗坏血酸钠(占硫酸亚铁质量)为亚铁保护剂。在最佳条件下螯合率为(90.68±1.31)%,与模型预测值92.71%基本吻合。研究表明,以微波固相合成技术进行花生肽亚铁固相催化制备肽金属配位螯合营养强化剂可行。展开更多
Under microwave radiation conditions,a series of heterocyclic aromatic selenium compounds of 2,1,3-benzoselena-diazole(BS);1,2,5-selenadiazolo[3.4-b]pyridine(SPb);5-methy1-2,1,3-benzo-[3,4-c]selenadiazole(MB);5,7-dihy...Under microwave radiation conditions,a series of heterocyclic aromatic selenium compounds of 2,1,3-benzoselena-diazole(BS);1,2,5-selenadiazolo[3.4-b]pyridine(SPb);5-methy1-2,1,3-benzo-[3,4-c]selenadiazole(MB);5,7-dihydroxy-1,2,5-selenadiazolo-[3,4-d]pyrimi dine(DHSP)and 2,1,3-naphtho-[2,3-c]selenadiazole(NS) were synthesized with their respective ortho-aromatic diamines and selenium dioxide,and their yields were between 29% and 84%.The products obtained from the microwave solid-state reactions were characterized by IR,XRD,UV,FS and EA.展开更多
Under the condition of microwave radiation the carboxylmethyl starch(CMS)was prepared with solid phase synthesis method.The degree of substitution and viscosity of CMS was affected by radiation time,the volume of sodi...Under the condition of microwave radiation the carboxylmethyl starch(CMS)was prepared with solid phase synthesis method.The degree of substitution and viscosity of CMS was affected by radiation time,the volume of sodium hydroxide and water.The cleaning-aid property of CMS was studied,and compared with that of the traditional synthesis ways.展开更多
为减少食品和动物饲料加工过程中无机铜的使用和添加对环境的污染和营养物质的浪费,开发新型氨基酸铜制剂具有重要意义。本实验从食品级猪皮明胶中分离制备L-羟脯氨酸(L-Hyp),并以L-Hyp和Cu SO_4·5H_2O为原料,采用固相微波辐射和...为减少食品和动物饲料加工过程中无机铜的使用和添加对环境的污染和营养物质的浪费,开发新型氨基酸铜制剂具有重要意义。本实验从食品级猪皮明胶中分离制备L-羟脯氨酸(L-Hyp),并以L-Hyp和Cu SO_4·5H_2O为原料,采用固相微波辐射和加压二级处理的方法制备L-羟脯氨酸-Cu(Ⅱ)(L-Hyp-Cu(Ⅱ)),制备条件为:L-Hyp和Cu SO_4·5H_2O物质的量比2.5∶1,即10.5 g L-Hyp和8.0 g Cu SO_4·5H_2O充分混匀,加入引发水20 m L,微波功率600 W,添加除酸剂无水Na_2CO_3 5.6 g,微波时间180 s;二级加压处理,将微波辐射处理后的样品转入加压反应釜中,在二级反应温度90℃、二级反应压强15 MPa、搅拌速率100 r/min条件下,反应35 min。并用紫外光谱、红外光谱、X衍射、扫描电子显微镜、配合分析、元素分析、重量分析等手段对配合物的组成和结构进行表征。结果表明:经微波辐射和加压二级处理可以提高L-Hyp-Cu(Ⅱ)螯合率,产品螯合率为86.4%。通过表征分析发现,Cu(Ⅱ)与L-Hyp中的羧基和亚氨基发生配位,反应所得产物L-Hyp-Cu(Ⅱ)配位比为1∶2,分子式为Cu(C_5H_8NO_3)_2。展开更多
文摘Under microwave radiation conditions,a series of heterocyclic aromatic selenium compounds of 2,1,3-benzoselena-diazole(BS);1,2,5-selenadiazolo[3.4-b]pyridine(SPb);5-methy1-2,1,3-benzo-[3,4-c]selenadiazole(MB);5,7-dihydroxy-1,2,5-selenadiazolo-[3,4-d]pyrimi dine(DHSP)and 2,1,3-naphtho-[2,3-c]selenadiazole(NS) were synthesized with their respective ortho-aromatic diamines and selenium dioxide,and their yields were between 29% and 84%.The products obtained from the microwave solid-state reactions were characterized by IR,XRD,UV,FS and EA.
文摘Under the condition of microwave radiation the carboxylmethyl starch(CMS)was prepared with solid phase synthesis method.The degree of substitution and viscosity of CMS was affected by radiation time,the volume of sodium hydroxide and water.The cleaning-aid property of CMS was studied,and compared with that of the traditional synthesis ways.
文摘为减少食品和动物饲料加工过程中无机铜的使用和添加对环境的污染和营养物质的浪费,开发新型氨基酸铜制剂具有重要意义。本实验从食品级猪皮明胶中分离制备L-羟脯氨酸(L-Hyp),并以L-Hyp和Cu SO_4·5H_2O为原料,采用固相微波辐射和加压二级处理的方法制备L-羟脯氨酸-Cu(Ⅱ)(L-Hyp-Cu(Ⅱ)),制备条件为:L-Hyp和Cu SO_4·5H_2O物质的量比2.5∶1,即10.5 g L-Hyp和8.0 g Cu SO_4·5H_2O充分混匀,加入引发水20 m L,微波功率600 W,添加除酸剂无水Na_2CO_3 5.6 g,微波时间180 s;二级加压处理,将微波辐射处理后的样品转入加压反应釜中,在二级反应温度90℃、二级反应压强15 MPa、搅拌速率100 r/min条件下,反应35 min。并用紫外光谱、红外光谱、X衍射、扫描电子显微镜、配合分析、元素分析、重量分析等手段对配合物的组成和结构进行表征。结果表明:经微波辐射和加压二级处理可以提高L-Hyp-Cu(Ⅱ)螯合率,产品螯合率为86.4%。通过表征分析发现,Cu(Ⅱ)与L-Hyp中的羧基和亚氨基发生配位,反应所得产物L-Hyp-Cu(Ⅱ)配位比为1∶2,分子式为Cu(C_5H_8NO_3)_2。
