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频率、温度和大豆分离蛋白对南极磷虾虾肉糜介电特性的影响 被引量:3
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作者 张毛赛 楼飞 +3 位作者 张瑞娟 卢敬昊 程裕东 金银哲 《食品与发酵工业》 CAS CSCD 北大核心 2017年第8期212-218,共7页
为探索微波加热作为虾肉糜复合物加工方式的可行性,以南极磷虾虾肉糜和大豆分离蛋白粉末及其复合物为研究对象,采用同轴探针技术测定了在25℃下不同压力(0~4.96 N)和堆积密度下大豆分离蛋白粉末的介电特性,以及大豆分离蛋白含量(0%~4%)... 为探索微波加热作为虾肉糜复合物加工方式的可行性,以南极磷虾虾肉糜和大豆分离蛋白粉末及其复合物为研究对象,采用同轴探针技术测定了在25℃下不同压力(0~4.96 N)和堆积密度下大豆分离蛋白粉末的介电特性,以及大豆分离蛋白含量(0%~4%)、温度(20~80℃)和频率(300 M^3 000 MHz)对南极磷虾虾肉糜介电特性的影响。结果表明,随着压力的增大,大豆分离蛋白粉末的介电常数增加,而介电损失率无显著变化(p>0.05),但在堆积密度下略大于其他压力下的介电损失率。虾肉糜复合物的介电常数随着温度的升高而降低,介电损失率在小于2 500 MHz时增大而大于2 500 MHz时减小,穿透深度随温度的升高而降低。一定温度和频率下,随着大豆分离蛋白含量的增加,南极磷虾虾肉糜的介电常数降低,而对介电损失率无显著影响(p>0.05)。对20~80℃时虾肉糜复合物的介电特性值的进行拟合,拟合系数均大于0.93。调节频率和温度,可改变南极磷虾虾肉糜复合物的介电特性;大豆分离蛋白的添加可降低其介电常数。 展开更多
关键词 南极磷虾 大豆分离蛋白 介电特性 温度 频率
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利用HCI程序确定儿茶酚化合物的反相高效液相色谱最佳分离条件 被引量:1
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作者 金银哲 卢敬昊 《色谱》 CAS CSCD 北大核心 2006年第5期466-470,共5页
有效地确定了反相高效液相色谱分离儿茶酚化合物的最佳条件。在水和甲醇的二元流动相里分别加入乙酸缓冲液,利用基于lnk=lnkw+SF,k=A+B/F,lnk=L+MF+NF2(F是流动相中有机物甲醇的体积分数)等保留因子的一次或二次方程式的塔板理论得到色... 有效地确定了反相高效液相色谱分离儿茶酚化合物的最佳条件。在水和甲醇的二元流动相里分别加入乙酸缓冲液,利用基于lnk=lnkw+SF,k=A+B/F,lnk=L+MF+NF2(F是流动相中有机物甲醇的体积分数)等保留因子的一次或二次方程式的塔板理论得到色谱分离结果;利用保留原理得到等度和梯度洗脱的最佳条件。得出最佳初始流动相是含0.1%乙酸的水和含0.1%乙酸的甲醇(体积比为75∶25)的混合溶液;梯度洗脱条件:初始流动相保持15m in,然后用10m in的时间将上述二元流动相的体积比线性变换成50∶50,直到完成全部分离。通过实验证实该计算结果与实验值相近。 展开更多
关键词 反相高效液相色谱 儿茶酚化合物 HCI程序 保留原理 流动相组成
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双离子液体修饰硅胶材料对可可壳萃取液中茶多酚的吸附研究
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作者 田明磊 张丹 +2 位作者 陈佩 李小满 卢敬昊 《长江大学学报(自然科学版)》 CAS 2021年第3期108-114,共7页
茶多酚作为一种具有抗氧化抗癌活性的天然物质,受到广泛关注。可可壳萃取液中含有大量的茶多酚,利用吸附剂将其从萃取液中吸附分离是最为便捷的方法。双离子液体修饰吸附剂具有多种优良的性能,能通过产生多种化学键对目标物进行高效吸... 茶多酚作为一种具有抗氧化抗癌活性的天然物质,受到广泛关注。可可壳萃取液中含有大量的茶多酚,利用吸附剂将其从萃取液中吸附分离是最为便捷的方法。双离子液体修饰吸附剂具有多种优良的性能,能通过产生多种化学键对目标物进行高效吸附。为了揭示双离子液体官能团与茶多酚之间吸附机理,以硅胶材料为基体,通过硅烷化试剂对其改性后再修饰双离子液体,获得了12种修饰硅胶材料,而后在不同温度条件下对多个浓度的茶多酚标准溶液进行静态吸附研究。结果表明,修饰后的材料在1568.7cm-1附近出现了新的峰,这是咪唑基团的特征吸收波长,说明咪唑基团被修饰在硅胶材料上。在2936.4cm-1附近出现了吸收峰,这个波长在C--H烷基基团的吸收波长范围内,因此说明了双离子液体基团被修饰在硅胶材料上;Sil@Eim-IL(IL为Bim、Eim、Mim、Im)系列的4种材料对茶多酚的吸附量远高于其他系列,吸附量在57.3mg/g以上;30℃下2h为最优化的吸附条件,Sil@Eim-Eim比其他吸附剂具有更高的吸附量,达到58.0mg/g;在最优条件下,利用Sil@Eim-Eim对可可壳甲醇水萃取液中茶多酚进行吸附分离,经高效液相色谱分析证明其能够完全吸附萃取液中的茶多酚。 展开更多
关键词 双离子液体 可可壳 茶多酚 吸附 硅胶材料
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Optimum of Mobile Phase Condition for Resolving Isoflavones in RP-HPLC 被引量:2
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作者 郑金珠 盧敬昊 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2007年第2期291-295,共5页
In reversed-phase high performance liquid chromatography (RP-HPLC), the mobile phase condition for separating eight isoflavones (daidzin, glycitin, genistin, 6'-o-acetyl daidzin, 6'-o-malonyl genistin, daidzein, ... In reversed-phase high performance liquid chromatography (RP-HPLC), the mobile phase condition for separating eight isoflavones (daidzin, glycitin, genistin, 6'-o-acetyl daidzin, 6'-o-malonyl genistin, daidzein, glycitein and genistein) was optimized using the HCI (High-Purity Separation Laboratory, Department of Chemical Engineering, Inha University) program software. The optimum composition of mobile phase for the separation of the eight isoflavones was obtained. The elution profiles were calculated by the plate theory based on the equations of retention factor, In k=A+BF+CF2, where F was the volume percentage of acetonitrile with 0.1% acetic acid (AA). The first mobile phase composition was water with 0.1% AA/acetonitrile with 0.1% AA (88%/12%, by volume), followed at 9min later by the second composition of mobile phase which was step-changed to 85%/15%, at 19rain by the third composition which was step-changed to 73%/27%, at 30min when it was changed to 65%/35% and finally it was maintained in isocratic mode to the end of the run time at 50rain. Although, using step gradient mode to separate the isoflavones, the calculated and experimented data were not achieved very good agreement, we could estimate the closed retention time before experiment. And the agreement between the experimental data and the calculated values was relatively good using isocratic separation for eight isoflavones, but the retention time is very long. 展开更多
关键词 HCI program OPTIMUM separation condition ISOFLAVONE HPLC
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Extraction and Determination of Quercetin and Myricetin from Chamaecyparis obtusa by Ionic Liquids-based Monolithic Cartridge
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作者 朱涛 毕文韬 卢敬昊 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2011年第8期1759-1763,共5页
A short ionic liquids (ILs)-based monolithic cartridge was prepared and used as the selective extraction sorbent. After the material was evaluated by field emission-scanning electron microscopy (FE-SEM), a new app... A short ionic liquids (ILs)-based monolithic cartridge was prepared and used as the selective extraction sorbent. After the material was evaluated by field emission-scanning electron microscopy (FE-SEM), a new approach for the extraction and determination of quercetin and myricetin from Chamaecyparis obtusa (C. obtusa) by using ILs-based, monolithic cartridge system was developed. Chromatographic analysis was conducted on a C18 column with UV detection at 372 nm, an eluting solution consisting of acetonitrile-water (25/75, V/V) as the mobile phase, and a flow rate of 0.7 mLomin 1. A good linear relationship was demonstrated when the concentrations of quercetin and myricetin were in the range of 0.5--100.0 ggomL-1. The recoveries ranged from 101.6% to 104.6% and the inter- and intra-day relative standard deviations (RSD) were less than 5.0%. This method effectively removed the impurities and avoided tedious pretreatment. It provided a fast, economic and effective method for assaying trace drugs from natural plants. 展开更多
关键词 EXTRACTION ionic liquids MONOLITHIC MYRICETIN QUERCETIN
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