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建立了高效液相色谱法测定大豆磷脂类保健品中磷脂酰胆碱含量的方法。样品经丙酮溶解去除油脂类杂质干扰后,离心弃去上层液体,残液用氮气吹干,然后用正己烷-异丙醇(1+1)混合液溶解残渣,以正相硅胶柱(250mm×4.6mm,5μm)为固定相,以乙腈-甲醇-磷酸(80+20+0.6)溶液等度洗脱分离,用紫外检测器于波长205nm处检测。磷脂酰胆碱的质量浓度在2.136g·L-1以内与其峰面积呈线性关系。应用此法分析大豆磷脂软胶囊,平均回收率在90.2%~96.1%之间;测定值的相对标准偏差(n=6)在1.2%~3.6%之间。 相似文献
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二亚油酰磷脂酰胆碱分析 总被引:1,自引:0,他引:1
通过HPLC/HPLC-MS研究了二亚油酰磷脂酰胆碱的测定方法,磷脂样品首先经过HPLC分离得到磷脂酰胆碱,该磷脂酰胆碱再进一步通过不同的HPLC系统分离二亚油酰磷脂酰胆碱,并通过标准样品和质谱进行二亚油酰磷脂酰胆碱的定性.定量方法通过标准样品外标法定量,由方法的回收率和精密度试验可知,该方法已用来测定一般磷脂样品和磷脂酰胆碱样品中的二亚油酰磷脂酰胆碱含量. 相似文献
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高效液相色谱-蒸发光散射法测定甘油磷脂酰胆碱 总被引:1,自引:0,他引:1
建立了高效液相色谱-蒸发光散射法(HPLC-ELSD)测定甘油磷脂酰胆碱(L-α-GPC)的方法。得到最佳色谱条件:色谱柱为Tigerkin Diol柱(250×4.6mm,5μm),流动相为甲醇-水(体积比90∶10),氮气流量为1.50L/min,漂移管温度为65℃。用外标法对L-α-GPC和磷脂酰胆碱(PC)进行定量分析,线性范围分别为0.25~3.00g/L和0.50~5.00g/L,相关系数分别为0.9993和0.9987;平均回收率分别为95.87%和95.72%;相对标准偏差分别为1.75%和1.93%。该方法能够简便快速的将L-α-GPC与其他磷脂进行分离。 相似文献
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大豆磷脂中磷脂酰胆碱的脂肪酸组成分析 总被引:3,自引:0,他引:3
1 引 言磷脂是生物膜的主要成分 ,是由甘油骨架、极性基团和不饱和脂肪酸组成的脂质类化合物。磷脂种类 (PC ,PE等 )的化学组成决定磷脂的物理特性 ,进而影响生物膜的功能。研究表明 :磷脂脂肪基团中不饱和碳 碳键是决定其相变温度的关键因素 ,同时 ,环境因素影响磷脂的脂肪酸组成 ,随环境温度的变化 ,磷脂的脂肪酸组成也作出相应的调整。因此 ,测定磷脂酰胆碱的脂肪酸组成 ,对研究大豆的遗传性及环境因素对其所造成的影响具有重要意义。磷脂脂肪酸组成的分析已有报道 ,但对于大豆磷脂酰胆碱脂肪酸组成的分析国内至今未见报道。本… 相似文献
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磷脂酰胆碱水溶液CMC的测定陈鲁生周武姜云生(山东师范大学化学系济南250014)关键词磷脂酰胆碱临界胶束浓度磷脂酰胆碱是一种天然生物两性表面活性物质,也是一种重要的生命物质,具有广泛的用途[1],由于磷脂酰胆碱的水溶性较差,所以较长时间以来对其溶液... 相似文献
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超临界流体色谱法分析大豆磷脂 总被引:9,自引:0,他引:9
采用以CO2 为流动相的超临界流体色谱方法 ,以含 0 0 5 % (体积分数 )三乙胺的乙醇作为改性剂 ,对具有重要生物功能的大豆磷脂组成进行分析 ,获得了大豆磷脂提取物中 6个重要组分的定性结果 ,并讨论了流动相组成、操作温度和压力对分离的影响。对其中有代表意义的磷脂酰胆碱 (PC)进行了外标法定量分析 ,在PC质量浓度为0 0 2 0 g/L~ 0 0 75 g/L时具有较好的线性关系 ,PC加样回收率为 96 7% (n =5 ) ,重现性好。此方法可用于实际样品的分析。 相似文献
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高效液相色谱法测定保健食品中大豆异黄酮含量 总被引:2,自引:0,他引:2
建立了高效液相色谱法(HPLC)测定保健食品中大豆异黄酮含量的方法,运用二极管阵列检测器(PDA)建立了4种大豆异黄酮D、G、De、Ge的光谱库,测定了D、G、Ge与De响应值之比.采用PDA检测,C18反相柱,以甲醇∶水∶醋酸(HAC)=55∶45∶1(V/V/V)为流动相测定了同一批保健食品美龄营养片中4种大豆异黄酮D、G、De、Ge的含量分别为2.24%、10.82%0、.085%、0.027%,变异系数小于5%,回收率为92.51%~99.30%.该方法快速,精密度及准确度在允许范围内,可作为保健食品中D,G,De,Ge的同时测定方法. 相似文献
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建立了一种用高效液相色谱同时测定银鲫肌肉组织中甲苯咪唑(MBZ)及其代谢物氨基甲苯咪唑和羟基甲苯咪唑的方法.银鲫肌肉组织用乙酸乙酯提取,萃取物旋转蒸发至干后用1 mL二甲基甲酰胺-0.05 mol/L磷酸盐缓冲液(体积比3 ∶ 7)定容.色谱条件:Waters symmetry C18反相色谱柱(250 mm×4.6 mm,5 μm);流动相:乙腈-0.05 mol/L磷酸二氢铵溶液(体积比33 ∶ 67);流速:0.8 mL/min;检测波长为298 nm;检测温度为室温.在10 ~120 μg/kg添加水平,MBZ、MBZ-NH2、MBZ-OH的回收率分别为81% ~86%、71% ~75%、86% ~93%.MBZ的检出限为2 μg/kg,MBZ-OH和MBZ-NH2检出限均为3 μg/kg. 相似文献
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利用傅立叶变换红外(FT-IR)和拉曼(FT-Raman)光谱研究了高浓度磷脂酰胆碱(PC)与牛血清白蛋白(BSA)的相互作用,及Eu3+对该作用的影响.FT-IR结果显示,PC/BSA混合体系中二者的相互作用主要发生在PC头部极性基团,且这一作用随BSA含量的增加而增强,作用后蛋白质二级结构中α螺旋的比例有所增加. FT-Raman光谱说明PC与BSA的相互作用影响磷脂CH链的排列有序程度. PC/BSA/Eu3+体系的红外光谱显示, Eu3+与PC的磷氧键发生了强相互作用,并使蛋白α螺旋的比例进一步增加. 相似文献
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HPLC-MSD法鉴定吡虫啉中的微量杂质 总被引:1,自引:0,他引:1
农药是一类有毒的精细化学品,其毒性主要来自农药母体、杂质、代谢物及农药加工中加入的表面活性剂等.近年来随着人们环保意识的增强,农药全分析研究越来越受到农药管理机构、生产厂家和贸易公司的关注[1],目的在于明确农药产品的有效成分、杂质、水分等及其含量范围,降低其对环境的潜在危害.吡虫啉是一种高效低毒的硝基亚甲基类内吸杀虫剂,用于防治刺吸式害虫,是一种优良的广谱杀虫剂,特别适用于种子处理和以颗粒剂使用[2].本文利用高效液相色谱-质谱连用技术对吡虫啉进行了全分析研究,鉴定了所存在的杂质.方法使用性强,色谱分离效果好,可用于该农药各成分的定性、定量分析. 相似文献
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《Analytical letters》2012,45(12):2163-2176
Abstract The purpose of the study was the quantitative determination of fluconazole by IR spectrophotometry which was realized by the application of the KBr disc technique. In this study dehydrocholic acid was used as internal standard. The absorption bands at 960 and 675 cm?1 were chosen for fluconazole and 1705 cm?1 for dehydrocholic acid. The concentration range between 0.4–1.6% w/w in KBr disc showed compliance with Beer's law. Besides IR spectroscopy, UV spectroscopy and HPLC methods were also used In the quantitative determinations. In the UV spectroscopy method the absorbance value at 261 nm in MeOH was used for fluconazole. In quantitative determinations which were performed by using HPLC, ketoconazole was the internal standard. Different regression equations were applied for each method in order to complete the quantitative determination. In UV spectroscopy and HPLC methods, relative standards were found as 0.74, 1.04% and in IR spectroscopy (675, 960 cm?1) relative standards were found as 1.1 and 1.51%, respectively. 相似文献
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Sabrina Moret Susi Cherubin Maria Teresa Rodriguez-Estrada Giovanni Lercker 《Journal of separation science》1994,17(12):827-830
This work suggests an HPLC method for qualitative and quantitative determination of Nε(2-amino-2-carboxyethyl)-L -lysine (LAL). LAL was released from total hydrolysates of various proteins of animal origin and derivatized with dansyl chloride. The performance of two different columns, Spherisorb 3S TG and μ-Bondapack C18, was compared; better resolution and quantitative response were obtained with the former. The mobile phase was a mixture of 0.01 M phosphate buffer (pH 7) and acetonitrile. Linear response and quantitative repeatability were tested for both detectors used (UV-Vis set at 254 nm; fluorimetric set at λex(max) = 360 nm and λem(max) = 525 nm). For LAL standard the minimum detectable amount was 0.05 ng, whereas for LAL in actual samples the amount was 0.5 ng (40 μg/g of analyzed proteins). Good analytical repeatability was obtained, resulting in CV % of 4.7 and 3.8 for UV and fluorimetric detectors, respectively. LAL recovery was determined using both detectors; the values obtained were 94 % (fluorimetric) and 92 % (UV). Greater noise levels were observed with the fluorimetric detector and its higher sensitivity could not, therefore, be fully utilized. The highest amounts of LAL were found in the casein (2816 μg/g) and cooked albumin (615 μg/g) samples. 相似文献
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高效液相色谱-蒸发光散射检测法测定蛋黄卵磷脂的含量 总被引:4,自引:0,他引:4
建立了蛋黄磷脂中卵磷脂(即磷脂酰胆碱,PC)的高效液相色谱-蒸发光散射检测(HPLC-ELSD)的测定方法。以Nov a-Pak Silica 60A硅胶柱(3.9 mm i.d.×150 mm,4 μm)为分离柱,正己烷-异丙醇-3%冰醋酸水溶液(体积比为35∶65 ∶8)为流动相,等度洗脱,流速1.0 mL/min,柱温30 ℃。蒸发光散射检测器漂移管温度50 ℃,雾化气(空气)压力350 kPa。在上述条件下测得PC在0.16~1.61 g/L范围内线性关系良好(r2=0.9979),检测限为0.64 μg,方法的精密度为3.2%(n=5),回收率为98.2%~128.2%。将该方法用于实际样品的测定,获得了令人满意的结果。该方 法预处理简单,分析速度快,可用于蛋黄磷脂中卵磷脂的测定。 相似文献
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Yonemoto H Ogino S Nakashima MN Wada M Nakashima K 《Biomedical chromatography : BMC》2007,21(3):310-317
A simple and sensitive HPLC-UV method was developed for the determination of paclitaxel (TXL) in human and rat blood samples. 4-Hydroxybenzoic acid n-hexyl ester was used as an internal standard. TXL was extracted by a liquid-liquid extraction with tert-butylmethyl ether. The disturbing peaks in the case of serum sample were removed by pre-extraction with hexane. The separation of TXL was achieved within 25 min using an ODS column with 50% acetonitrile aqueous solution as a mobile phase at a flow rate of 1.0 mL/min. The eluent was monitored at 230 nm, and the resulted retention times of TXL and IS were 11.2 and 20.4 min. The detection limits of TXL for human plasma, serum and rat plasma samples at a signal-to-noise ratio of 3 were 10, 9.5 and 7.5 ng/mL, respectively. The proposed methods were applicable to the determination of TXL in human patients' plasma ranging from 15 to 27 ng/mL. Furthermore, monitoring of the time course of TXL after its single administration to rat could be demonstrated. 相似文献