红米酒中多酚类化合物的高效液相色谱法测定

建立高效液相色谱同时测定红米酒中11种多酚类化合物的方法。采用Venusil C18色谱柱(250 mm×4.6 mm,φ5μm)分离11种酚类物质,流动相为50%乙腈和超纯水,分别加1%乙酸,进样量20μL,采用梯度洗脱,流速为1.0 m L/min,柱温30℃,检测波长260、320 nm。各组分的质量浓度与其峰面积具有良好的线性关系,相关系数均大于0.999 6,且11种酚类物质在45 min内得到了较好分离。方法回收率在88.6%~102.5%之间,相对标准偏差为0.76%~1.60%。本方法可用于红米酒中多酚类化合物的快速分析。     

高效液相色谱法测定糜子中酚酸类化合物

为探索糜子麸皮和糜米中酚酸类物质的成分和含量,采用福林-酚法和高效液相色谱法测定比较糜子麸皮 和糜米中自由酚含量和酚酸类物质的种类。结果表明：不同品种糜子麸皮之间自由酚含量差异不显著,糜米之间自 由酚法差异极其显著（P＜0.01）。同一品种糜子麸皮和糜米之间自由酚含量差异显著（P＜0.05）,糜子麸皮自由 酚含量远高于糜米。赤糜2号麸皮和糜米中自由酚含量最高,麸皮中为159.22 mg没食子酸/100 g,糜米中为47.98 mg 没食子酸/100 g。糜子中检测到的酚酸类物质有绿原酸、丁香酸、香草酸、p-香豆酸、阿魏酸。     

高效液相色谱法测定菠萝中多酚类化合物

利用高效液相色谱法(HPLC)分析了多酚类物质在菠萝果皮、果肉、果心中的含量及分布情况。色谱条件：色谱柱为 Diamonsil C_(18)柱(250 mm×4．6 mm,5μm),流动相为乙腈和0．3%醋酸溶液,柱温为25℃,流速为 1．0mL/min,线性梯度洗脱,检测波长为280nm。在此色谱条件下,各组分均得到良好分离。经测定,菠萝果皮中含有4种酚类物质,为没食子酸、儿茶素、表儿茶素、阿魏酸,含量较高；果肉及果心中酚类物质为表儿茶素和阿魏酸,含量较低。     

微波辅助萃取液相色谱快速检测烟草中的多酚类化合物

建立了卷烟烟丝中三个主要多酚化合物(绿原酸、莨菪亭、芸香苷)的超高效液相色谱(UPLC)的快速检测方法.采用微波辅助萃取法(microwave-assisted extraction MAE)分别进行单因素试验和正交试验,确定卷烟烟丝中三个主要多酚类化合物的最佳提取条件:60%(V/V)的甲醇水溶液为提取剂、萃取液温度...     

Analysis of Phenolic Compounds of Dabai (Canarium odontophyllum Miq.) Fruits by High-Performance Liquid Chromatography

Dabai (Canarium odontophyllum Miq.) fruit is a popular seasonal indigenous fruit of Sarawak, Malaysia that is always appreciated as an exotic fruit by the local community. The present study was designed to identify and quantify the phenolic compounds of dabai fruits from different divisions of Sarawak. Difference between the purple and red varieties of the fruits was also investigated. Analysis of phenolic compounds was performed by reversed phase high-performance liquid chromatography coupled with diode array detector. Three detection wavelengths (280, 254 and 329 nm) were used to monitor all phenolic compounds (except for anthocyanidins) since they display absorbance maxima at different wavelengths. Characteristic spectra of eluted peaks provide useful information in confirming the identities of peaks. Hydrolysis of phenolic compounds of dabai fruits was insufficient under the milder conditions (30 °C, 2 h) employed thus resulted in unidentified peaks. Two phenolic acids (ellagic and vanillic acids), five flavonoids (catechin, epicatechin, epicatechin gallate, epigallocatechin gallate, apigenin) and ethyl gallate were detected in the fruits. Furthermore, three anthocyanidins (cyanidin, pelargonidin and delphinidin) and four anthocyanins (malvidin-3,5-di-O-glucoside, cyanidin-3-O-glucoside, cyanidin-3-O-rutinoside and peonidin-3-O-glucoside) were detected. All these phenolic compounds were reported in dabai fruits for the first time. The fruit variety affected the anthocyanidins and anthocyanins profile (p < 0.01) but had little or no effect on the phenolic acids and flavonoids profile of the fruits. Within the same variety, diversity in environmental conditions had an impact on the quantitative differences of phenolic compounds (p < 0.05).     

HPLC法测定苹果浓缩汁中的多酚类物质

利用高效液相色谱法(HPLC)分析了儿茶素、绿原酸、咖啡酸、表儿茶素、香豆酸、阿魏酸等六种酚类物质在鲁加1号和鲁加5号苹果浓缩汁中的的含量.色谱条件:色谱柱为EdipseXDB-C18色谱柱(150mm×4.6mm id,5μm),以甲醇-1%乙酸水溶液作为流动相进行梯度洗脱.柱温30℃,流速为1.0ml/min,检测波长为280nm.在此色谱条件下,各组分均得到很好的分离.经测定鲁加1号苹果浓缩汁中含有儿茶素、绿原酸、咖啡酸、表儿茶素、香豆酸、阿魏酸等六种酚类物质;鲁加5号苹果浓缩汁中含有较少的绿原酸、咖啡酸、表儿茶素、香豆酸、阿魏酸等五种酚类物质.     

多杀菌素的高效液相色谱测定

本文建立了高效液相色谱法测定多杀菌素的定量分析方法,本方法的相对标准偏差为1.3441,变异系数为1.8067%,线性相关系数为0.99959,平均回收率达到99.2429%,最后采用液质联用方法对目标化合物进行验证.     

二维液相色谱法测定卷烟主流烟气中的间-苯二酚及其他酚类化合物

建立了测定卷烟主流烟气中7种主要酚类化合物的二维液相色谱方法,考察了中心切割和二维分离间-苯二酚的色谱条件,以及二维液相色谱系统的稳定性,并采用该方法测定了12种卷烟样品主流烟气中的这7种酚类化合物.结果表明:①中心切割和二维液相色谱能够有效分离间-苯二酚与干扰物质;②中心切割和二维液相色谱不影响卷烟主流烟气中其它6种酚类化合物的准确定量;③12种卷烟样品主流烟气中间-苯二酚的释放量为0.72～2.15μg/支.     

Determination of Chlorantraniliprole Residues in Grape by High-Performance Liquid Chromatography

An effective analytical method for the residue analysis of a novel insecticide chlorantraniliprole and its dissipation in grape were studied. Chlorantraniliprole residues were extracted from grape samples with ethyl acetate. The extract was cleaned up with QuEChERS (Quick, Easy, Cheap, Effective, Rugged and Safe) method and determined by high-performance liquid chromatography with photodiode array detector (HPLC-DAD). At fortification levels of 0.06, 0.5, and 1.0 mg kg^?1 in grape, it was shown that recoveries ranged from 95.11 to 102 % with relative standard deviation (RSD) of 6 to 11 %. The limit of detection (LOD) and limit of quantification (LOQ) were found to be 0.02 and 0.06 mg kg^?1, respectively. The dissipation half-life time of chlorantraniliprole residues in grape was 2.70 days. According to maximum residue limit (MRL), the preharvest interval (PHI) of chlorantraniliprole on grape was 4 days after the treatment. Based on the results of this study and the relevant residue regulation, chlorantraniliprole residue levels will be acceptable when applied to grape in Egypt.     

Determination of Small Phenolic Compounds in Tequila by Liquid Chromatography with Ion Trap Mass Spectrometry Detection

Tequila is elaborated from Agave tequilana Weber blue variety and it is commercialized at different stages of aging. Chemical composition of this product has often been addressed; however, data on phenolic compounds are scarce. In this work, a high-performance liquid chromatography–electrospray ionization-ion trap mass spectrometry (HPLC–ESI-ITMS) procedure has been established for the determination of 34 small phenolic compounds. The combination of suitable separation conditions with extraction of chromatograms at individual m/z values has enabled for total analysis run of 17 min (11 min separation plus 6 min column cleaning/equilibration) with the detection limits in the range 1.28–75.0 μg l^?1 (0.07–6.1 pmol on-column). Commercial tequilas analyzed included 6 white, 12 rested, and 4 aged. The following acids were found and quantified: gallic, procatechuic, 4-hydroxybenzoic, vanillic, syringic, homovanillic, 3-hydroxybenzoic, ferulic, salicylic, and benzoic. The white tequilas contained fewer compounds and lower total phenolics concentrations (range 36–408 μg l^?1) as compared to the rested and aged liquors (515–4,296 and 2,048–3,249 μg l^?1, respectively). In the latter products, syringic, vanillic, procatechuic, and gallic acids were the most abundant, which indicates that maturation in wooden barrels is the main source of small phenolics in tequila. On the other part, homovanillic acid was found in all tequila types (medians for white, rested, and aged products 82, 153, and 162 μg l^?1, respectively), suggesting that some phenolics may originate from the raw material or might be formed during liquor elaboration.     

超高效液相色谱串联质谱法测定樱桃酒中的5种酚酸

建立了超高液相色谱-串联四级杆质谱联用(UPLC-MS/MS)技术同时检测樱桃酒中没食子酸、4-羟基苯甲酸、绿原酸、香草酸和咖啡酸5种生物活性酚酸的方法。采用Waters Acquity UPLC BEH色谱柱(100×2.1mm,1.7μm),流动相为甲醇-0.1%甲酸,在梯度条件下进行分析,分析物在负离子模式下用保留时间和质谱信息进行定性,峰面积进行定量,并评价其定量分析的精密度、线性和检出限。结果显示,回收率在82.3%～110.8%之间;相关系数r>0.99,线性关系良好;精密度的相对标准偏差RSD<2.0%,检出限为0.020～0.050mg/L,说明该方法简便、快速、准确、灵敏,可用于樱桃酒中酚酸的检测。此外,实验采用SPSS17.0软件对樱桃酒的理化指标和5种酚酸进行了简单相关分析。     

基质固相分散—高效液相色谱法测定蜂蜜中三种酚类化合物

采用基质固相分散技术处理样品、反相高效液相色谱法同时测定蜂蜜中三种酚类化合物.Diamonsil C18柱,甲醇-水(体积比为45:55)流动相,检测波长275 nm.在0.04 mg/L～16.3 mg/L范围内3组分线性关系良好.方法检出限分别为0.05 mg/kg～0.06 mg/kg.回收率范围:86.88%～90.88%.相对标准偏差分别为2.25%、2.31%、2.48%.     

高效液相色谱-四极杆飞行时间串联质谱法解析桑椹酒渣中的酚类物质

该研究通过研究桑椹酒渣中的酚类化合物,为开发酒渣的价值提供一定的理论基础和数据支撑。建立云桑二号桑椹酒渣中的酚类化合物的高效液相色谱-四极杆飞行时间串联质谱法（HPLC-Q-Time-of-Flight Mass Spectrometry,HPLC-Q-TOF-MS）定性分析方法。液相色谱使用ZORBAX SB-Aq(2.1 mm×100 mm,1.8-Micron）色谱柱,流动相为乙腈和0.1%(V/V）甲酸水溶液,梯度洗脱,采用ESI离子源在负离子模式进行质谱检测。最终鉴定出云桑二号桑椹酒渣中酚类物质共14种。然后利用标准品对照高效液相色谱法（High Performance Liquid Chromatography,HPLC）对高效液相色谱-四极杆飞行时间串联质谱法鉴定出的多酚类化合物进行了定量测定,发现桑椹酒渣中的酚类物质组成与桑椹大致相同。但各单体酚含量总体降低。其中,花青素类酚类物质含量最高的是天竺葵素-3-葡萄糖苷（718.30μg/g）,非花青素类多酚物质含量最高的是儿茶素（1 805.87μg/g）。这些结果表明桑椹酒渣酚类含量丰富,是开发健康食品的良好原料。     

高压液相色谱法测定大豆异黄酮含量

大豆试样在酸性条件下水解后,采用岛津LC-10AtvpHPLC仪,紫外检测器(SPD-10Avvp),波长 254 nm,色谱柱:Inertsil ODS-3柱(5μm,4.6 mm×250 mm),流动相:甲醇:5％ 醋酸溶液30％～70％梯度洗脱,流速:1.0 ml/min,柱温:50℃条件下,测定水解提取物中大豆异黄酮含量。测定结果表明:不同品种、产地的大豆中异黄酮含量为 1.40 mg～3.30 mg/g,大豆胚芽中异黄酮含量最高,为13.18mg/g;其它豆类,如红豆、绿豆、青豆、豌豆等异黄酮含量为0.37mg～1.2mg/g,此测定法能为大豆的选育种、栽培及大豆异黄酮含量评价提供依据。     

蓝莓酒中11种酚酸的高效液相色谱测定

实验采用LiChrospher100RP-18e色谱柱(250×4.0mmID,5μm),以甲醇:乙酸:水溶液为流动相,流速为1.0ml/min梯度洗脱,SPD-6AV紫外检测器,30℃柱温,紫外检测波长为280nm。建立了一种新的同时测定蓝莓酒中11种酚酸含量的高效液相色谱法,并测定了蓝莓酒发酵样中酚酸的含量。     

用毛细管气相色谱分析黄酒中的甜蜜素

建立了毛细管气相色谱分析黄酒中的甜蜜素的方法。先使样品通过沸水浴蒸发干后,在硫酸介质中与亚硝酸钠反应,生成环己醇亚硝酸酯,最后用毛细管柱分离,GC-FID检测甜蜜素含量。结果表明,本方法线性范围为0.1～2.0 mg/mL,最低检出限为2 mg/kg,加标回收率为95.4%～113.7%,相对标准偏差为2.34%～4.84%。该方法操作简便、快速、精密度好、准确度高,比较适合用于黄酒中甜蜜素含量的测定。     

采用高效液相色谱法分析荔枝酒中的酚类物质

选用乙酸乙酯作为荔枝酒酚类化合物的萃取溶剂,通过对HPLC洗脱条件的摸索,建立了HPLC同时分离荔枝酒中40多种组分的反相色谱条件。结合标准品保留时间比对和LC-MS-MS分析,准确定性了其中的(-)-表儿茶素、原花青素B2、没食子酸和芦丁等4种酚类物质,并在此基础上建立了这4种酚类化合物的HPLC定量测定方法,回收率均在85%以上。该技术为进一步研究荔枝酒的褐变问题提供了有效的分析手段。