高效毛细管电泳－安培检测法测定牙膏中丙三醇和山梨醇

 用高效毛细管电泳－安培检测装置，以２００μｍ铜圆盘电极为工作电极，在碱性介质中，建立了分离测定丙三醇和山梨醇的最佳实验条件。结果表明：平均理论塔板数为２．４×１０５／ｍ，丙三醇和山梨醇的浓度检测限分别为３００μｇ／Ｌ和２００μｇ／Ｌ，线性范围接近３个数量级。在５．００～５０．０ｍｇ／Ｌ内，丙三醇和山梨醇的相关系数分别为０．９９９７和０．９９９５。样品测定结果与用高效液相色谱法测定的结果基本一致，回收率在９２％～１０４％之间。     

高效毛细管电泳－安培检测法测定牙膏中丙三醇和山梨醇

用高效毛细管电泳－安培检测装置，以２００μｍ铜圆盘电极为工作电极，在碱性介质中，建立了分离测定丙三醇和山梨醇的最佳实验条件。结果表明：平均理论塔板数为２．４×１０５／ｍ，丙三醇和山梨醇的浓度检测限分别为３００μｇ／Ｌ和２００μｇ／Ｌ，线性范围接近３个数量级。在５．００～５０．０ｍｇ／Ｌ内，丙三醇和山梨醇的相关系数分别为０．９９９７和０．９９９５。样品测定结果与用高效液相色谱法测定的结果基本一致，回收率在９２％～１０４％之间     

微型毛细管电泳安培检测无糖口香糖中的木糖醇和山梨醇

采用微型的毛细管电泳-安培(CE-AD)测定装置对市售的3种无糖口香糖中的木糖醇和山梨醇的测定进行了研究。实验采用铜盘工作电极,在0.65V的检测电位下,用70mmol/L NaOH缓冲溶液,4kV的分离电压,木糖醇和山梨醇在10min之内实现了良好的分离,其中木糖醇的线性范围为5×10-5~1×10-2mol/L,山梨醇的线性范围为5×10-5~5×10-2mol/L(r>0.9997),检出限分别为5×10-6mol/L和2.5×10-6mol/L。该方法测定样品中木糖醇和山梨醇的相对标准偏差和回收率分别为3.7%、4.5%和98.1%、91.1%(n=10)。将该方法用于好丽友口香糖、益达口香糖、华艾康口香糖中木糖醇和山梨醇的测定,结果令人满意。     

HPLC测定山梨醇水溶液中山梨醇和甘露醇含量

采用HPLC法,以超纯水为流动相,用Sugar-pakⅡ(Waters)色谱柱和示差拆光检测器,准确地分离和测定了山梨醇水溶液中山梨醇和甘露醇的含量,变异系数1.42%,回收率99.89%。     

电化学法制备甘露醇阴极液中还原糖的测定

根据电化学制备甘露醇反应体系特征，研究了分光光度法测定阴极液中的还原糖，标准曲线回归方程为Y=0．2151ρ-0．0021，r=0．9999，25倍量的甘露醇和山梨醇对还原糖的测定基本无干扰，阴极液中的加标平均回收率为100．2％。     

高效液相色谱法测定木奈果中的山梨醇和糖类

用高效液相色谱外标法测定了木奈果中的可溶性糖和山梨醇 ,采用 μ Spherogelcarbohydrate柱和示差折光检测器 ,以水为流动相 ,柱温 85℃。相关系数在 0 970 9以上 ,加标回收率为 75 0 0 %～ 88 37%。测定结果表明 ,可溶性糖在果肉中的累积依果肉不同的生长发育阶段有特征性的变化。     

高效液相色谱法测定果中的山梨醇和糖类

 用高效液相色谱外标法测定了木　奈果中的可溶性糖和山梨醇,采用μ-Spherogel carbohydrate柱和示差折光检测器,以水为流动相,柱温85 ℃。相关系数在0.970 9以上,加标回收率为75.00%～88.37％。测定结果表明,可溶性糖在果肉中的累积依果肉不同的生长发育阶段有特征性的变化。     

D-甘露醇与D-山梨醇在纯水和卤化钠水溶液中的稀释焓

应用等温流动微量热技术测定了298.15 K下D-甘露醇和D-山梨醇在纯水和卤化钠水溶液中的稀释焓,利用M cM illan理论计算了D-甘露醇和D-山梨醇在纯水和卤化钠水溶液中焓相互作用系数.结果表明,D-甘露醇和D-山梨醇在纯水和卤化钠水溶液中的二阶焓相互作用系数均为正值,并随着卤离子半径的变化而相应变化;且同种溶剂中,D-甘露醇的二阶焓相互作用系数要大于D-山梨醇的.结合两分子结构的差异,通过溶质-溶质相互作用和溶剂-溶质相互作用对这一结果进行了讨论.     

离子排斥柱分离 /蒸发光散射检测同时测定天冬氨酸钾镁-山梨醇注射液中的天冬氨酸和山梨醇

 采用TSKgelOApak A离子排斥柱分离、蒸发光散射检测同时测定了天冬氨酸钾镁 山梨醇注射液中的天冬氨酸和山梨醇。在流动相为水 (含 0 1% (体积分数 )三氟乙酸 ) 甲醇 (体积比为 9∶1)溶液、柱温为室温的条件下 ,天冬氨酸和山梨醇的质量浓度为 2 0 0mg/L～ 2 0 0 0mg/L时与其峰面积具有良好的线性关系 (r =0 999)。该方法对天冬氨酸和山梨醇的检测下限分别为 30mg/L和 2 0mg/L。测定结果表明 ,该注射液的光、热稳定性非常好。     

衍生化毛细管气相色谱法测定糖尿病大鼠眼球晶体中糖醇含量

建立了大鼠眼球晶体中糖醇化合物包括葡萄糖、肌醇、山梨醇同时测定的毛细管气相色谱分析方法。通过改进用甘露糖为内标，先加入5％盐酸羟胺．吡啶溶液进行肟化反应，再加入醋酸酐溶液进行乙酰化反应，将糖醇化合物转化成相应的糖腈乙酰醇化合物，经SE-30毛细管柱色谱分离，氢火焰离子化检测器检测。葡萄糖、肌醇、山梨醇的回收率均在93％以上，其检出限分别为0．40、0．26和0．30mg/L。比较测定了正常对照组、糖尿病对照组、某中药复方治疗组的大鼠眼球晶体中各单糖的含量。     

Bestimmung der Mutarotation von Monosacchariden mittels Gas-Chromatographie — Aufklärung verschiedener Fructose- und Sorboseformen mit Gas-Chromatographie,Infrarot- und Massenspektroskopie

The mutarotation of a monosaccharide in solution can be investigated by gas chromatography. After varying time intervals the dissolved monosaccharides were deep-frozen with liquid air, lyophilized, silylated and the α- and β-forms gas-chromatographically determined. The calculated velocity constants for glucose are in good agreement with the results from rotation measurements. The gas chromatogram of mutarotated fructose shows five components. By means of infrared and mass spectroscopy the pyranoside and furanoside forms as well as the open-chain ketal form can be characterized. The composition of the equilibrium mixture was investigated. Similarly, sorbose and galactose were studied. A furanoside, a pyranoside and an open-chain ketal form could be shown from sorbose, while galactose gave a furanoside and two pyranoside forms.     

Quantitative determination of endogenous sorbitol and fructose in human nerve tissues by atmospheric-pressure chemical ionization liquid chromatography/tandem mass spectrometry

Attachment of anions to sorbitol and fructose has been shown to enhance sensitivity in both electrospray ionization (ESI) and atmospheric-pressure chemical ionization (APCI) mass spectrometry. The post-column addition of CHCl3 produced Cl-adducts of sorbitol and fructose but their signals were suppressed due to the elevated background. Different chlorinated compounds and different additive methods were systematically investigated to form more abundant Cl-adduct precursor ions and deprotonated product ions. The major causes of the high background were explored and effective methods were developed to improve the signal-to-noise ratios and reproducibility. The compositions of mobile phase, percentages of organic modifiers (MeCN, MeOH and water), columns, oven temperature, flow rates and different gradients were investigated to separate sorbitol from fructose along with their isomers including glucose, galactose, mannose, sorbose, mannitol, and dulcitol. The optimized separation was achieved on a Luna 5 mu NH2 100A column (150 x 4.6 mm) using a mobile phase containing MeCN with 0.1% of CH2Cl2 and 50% MeOH in water at a flow rate of 800 microL/min and an oven temperature of 40 degrees C using a gradient liquid chromatography (LC) system. Human nerve tissue samples were extracted by protein precipitation followed by mixed-mode solid-phase extraction. The LC/ESI-MS/MS method produced higher peak intensities than LC/APCI-MS/MS. However, there were matrix effects from extracted tissues in LC/ESI-MS/MS but not in LC/APCI-MS/MS. Consequently, APCI proved to be the more effective method of ionization. Then the LC/APCI-MS/MS method was fully validated and successfully applied to analysis of clinical samples. The concentrations of endogenous sorbitol and fructose were determined using calibration curves employing sorbitol-13C6 and fructose-13C6 as surrogate analytes. The method has provided excellent intra- and inter-assay precision and accuracy with linear ranges of 0.2-80 ng/mg for sorbitol and 1-400 ng/mg for fructose in human nerve tissues.     

Rapid and simple determination of aldose reductase and sorbitol dehydrogenase

Rapid and well-reproducible methods were developed for the determination of aldose reductase and sorbitol dehydrogenase. The aldose reductase activity measurement is based on photometric o-toluidine aldose back-measurement, which is widely used in laboratories for the quantitative determination of glucose. The spectrophotometric method based on the quantitative decrease in NADH proved suitable for the measurement of sorbitol dehydrogenase activity.Both methods could well be employed for the measurement of the aldose reductase and sorbitol dehydrogenase activities of normal and diabetic tissue homogenizates, and for the comparison of the measured values.     

Rapid Quantitative Method for the Determination of Dextrose,Mannitol, and Sorbitol in Meat Products by Liquid Chromatography

Abstract

A liquid chromatographic (LC) method for the determination of dextrose, mannitol, and sorbitol in meat products was developed. Dextrose, mannitol, and sorbitol were extracted from comminuted meat products with 52% ethanol. After filtration, the extracts were purified by passing through a C₁₈ Sep-Pak cartridge and two ion exchange resin Econo-Columns in series. After concentration and filtration, extracts were analyzed by liquid chromatography using a cation exchange analytical column and a differential refractometer detector. Homogeneously ground samples of cooked and fresh sausages and ground beef were fortified with dextrose, mannitol, and sorbitol at four different concentrations. Average overall recovery for all three compounds at all four levels of fortification was greater than 80% with coefficients of variation less than 10%.     

Preformulation studies for atorvastatin calcium

This paper deals with the study of compatibility between antihyperlipidemic agent atorvastatin calcium trihydrate (ATV) and eight pharmaceutical excipients used in the development of solid dosage forms, namely citric acid, anhydrous lactose, magnesium citrate, magnesium carbonate, sodium carboxymethyl cellulose, polyvinylpyrrolidone K30, colloidal silica and sorbitol. As investigational tools, universal attenuated total reflectance Fourier transform infrared spectroscopy and powder X-ray diffractogram patterns were used for binary mixtures of ATV with each excipient at ambient condition and then completed by subjecting the samples to thermal stress using thermal analysis (TG/DTG/HF), in non-isothermal conditions and in oxidative medium. It was shown the binary mixtures do not present interactions between ATV and excipients when stored under ambient conditions for 2 months, while under thermal stress, ATV presents interactions with sorbitol.

     

pH-Metric determination of D-Sorbitol in the medicinal preparation poliamin

A procedure for the potentiometric determination of D-sorbitol in the solution of a medicinal preparation Poliamin was developed. The procedure involved binding of sorbitol with boric acid to form borosorbic acid, which was subsequently titrated with a standard solution of sodium hydroxide to a constant pH. The effect of pH and the concentrations of reagents on the accuracy of the results of analysis was studied     

An improved turbidimetric procedure for the determination of sulphate in plants and soils

A rapid turbidimetric procedure for the determination of sulphate in soils and plants has been developed with sorbitol as stabilizing agent. When used in a concentration of 20% in the final volume, the sorbitol regulates the size of the BaSO(4) particles formed and stabilizes them against sedimentation, growth and aggregation for long periods of time. The conditions of precipitation are not rigorous, as they are in similar procedures. Linearity of the calibration curve up to 50 ppm of sulphate and good reproducibility are special attributes of the procedure.     

Synthesis of an Orthogonally Protected Polyhydroxylated Cyclopentene from l‐Sorbose

The use of l ‐sorbose in the synthesis of functionalized cyclopentene derivatives was accomplished. These cyclopentene derivatives are related to those found in naturally occurring jatrophane frameworks and in other bioactive compounds. The formation of allyl α‐l ‐sorbopyranoside was a key synthetic step. Regioselective introduction of protecting groups was followed by the hydrolysis of the allyl glycoside to furnish a fully protected acyclic l ‐sorbose derivative. This acyclic intermediate was subsequently used to give an orthogonally protected polyhydroxylated cyclopentene, which has potential for further synthesis of bioactive compounds. The protected cyclopentene itself showed a clear cytotoxic activity when tested against a panel of human cancer cell lines (HT29, LS174T, SW620, A549, and HeLa cells).