高效液相色谱法测定化妆品中5种防腐剂

建立高效液相色谱同时检测化妆品中对羟基苯乙酮、苯氧乙醇、对羟基苯甲酸甲酯、对羟基苯甲酸乙酯、对羟基苯甲酸丙酯5种成分含量的方法。样品经甲醇提取后,经CAPCELL PAK C₁₈色谱柱分离,流动相为乙腈和0.1%磷酸溶液,梯度洗脱,流量为1.0 mL/min,检测波长为270 nm,进样体积为10μL。对羟基苯乙酮和对羟基苯甲酸甲酯的质量浓度在0.1～50 mg/L范围内,苯氧乙醇质量浓度在2.0～1 000 mg/L范围内,对羟基苯甲酸乙酯和对羟基苯甲酸丙酯质量浓度均在0.25～125 mg/L范围内与色谱峰面积具有线性关系良好,相关系数均为0.999 9。在水剂、乳液、膏霜三种基质中,5种成分低、中、高3个浓度水平的平均加标回收率为94.16%～102.87%,测定结果的相对标准偏差为0.9%～6.9%(n=6)。该方法可用于化妆品中对羟基苯乙酮等5种防腐剂的含量检测。     

高效液相色谱法同时测定乳制品中7种防腐剂

采用高效液相色谱法同时测定乳制品中7种防腐剂富马酸二甲酯、纳他霉素、对羟基苯甲酸甲酯、对羟基苯甲酸乙酯、对羟基苯甲酸丙酯、对羟基苯甲酸丁酯和对羟基苯甲酸甲酯异丁酯的含量。样品用甲醇提取,以Symmetry C18色谱柱(4.6mm×25mm,5μm)为固定相,甲醇-0.02mol.L-1乙酸铵(60+40)混合溶液为流动相,用二极管矩阵检测器测定。7种防腐剂在20min内可达到基线分离。7种防腐剂的质量浓度均在1.0～40.0mg.L-1范围内与峰面积呈线性关系,方法的检出限(3S/N)在0.2～0.5mg.kg-1之间。方法用于乳制品分析,加标回收率在87.5%～104%之间,测定值的相对标准偏差(n=6)在2.5%～8.8%之间。     

反相高效液相色谱法测定食品中防腐剂和甜味剂

建立了高效液相色谱法测定食品中苯甲酸、山梨酸、安赛蜜、糖精钠和阿斯巴甜含量的方法.试验采用ODS-3色谱柱,以乙腈-20 mmol·L-1磷酸二氢钾溶液为流动相梯度洗脱,用紫外检测器于210 nm波长处检测糖精钠和阿斯巴甜,于230 nm波长处检测另外3种化合物.结果表明:当各个组分的质量浓度在10～200 mg·L-1范围内,质量浓度与峰面积呈线性关系.对5种化合物的测定作了精密度及回收率试验,所得结果在文中详述.     

超高效液相色谱法测定湿巾中7种防腐剂

建立超高效液相色谱法测定湿巾中7种防腐剂的检测方法。样品采用甲醇超声提取,色谱柱采用Waters ACQUITY UPLC BEH C_(18)柱(50 mm×2.1 mm,1.7μm),流动相为甲醇–乙酸水溶液(pH 3.3)梯度洗脱,初始流量为0.8 m L/min,用PDA检测器检测,检测波长分别为255,270,310 nm。以3倍空白噪音计,2-溴-2-硝基丙烷-1,3-二醇,苯酚,苯甲醇,苯氧乙醇,苯甲酸,山梨酸,脱氢乙酸的检出限分别为60.0,0.5,20.0,8.0,5.0,0.2,0.5 mg/kg;方法加标回收率为100.9%~109.3%;测定结果的相对标准偏差为0.2%~1.9%(n=6)。结果表明该方法处理简单,分离效果好,速度快,能快速准确测定湿巾中7种防腐剂。     

高效液相色谱法同时测定婴儿湿巾中9种防腐剂

称取0.500 0g湿巾样品,剪碎后,加入80%(体积分数)甲醇溶液5.00mL,漩涡振荡提取3min,经0.22μm滤膜过滤,以Diamonsil C_(18)(2)色谱柱(4.6mm×250mm,5μm)分离滤液中的9种防腐剂,流动相为甲醇-0.1%(质量分数)磷酸溶液,梯度洗脱。采用二极管阵列检测器,咪唑烷基脲、5,5-二甲基海因、2-溴-2-硝基丙烷-1,3-二醇、苄索氯胺和苯扎氯铵的检测波长为210nm,氯苯酣醚的检测波长为230nm,醋酸氯己定、山梨酸钾和氯化十六烷基吡啶的检测波长为254nm。9种防腐剂的质量浓度在一定范围内与对应的色谱峰面积呈线性关系,检出限(3S/N)在0.01～0.5mg·L~(-1)之间。对空白样品进行加标回收试验,回收率在77.2%～100%之间,测定值的相对标准偏差(n=6)在1.2%～8.4%之间。应用该方法分析了20批次婴儿湿巾样品,有15批次的样品中检出咪唑烷基脲、5,5-二甲基海因、2-溴-2-硝基丙烷-1,3-二醇、醋酸氯己定、山梨酸钾或苄索氯胺。     

高效液相色谱法测定化妆品中防腐剂的研究

采用高效液相色谱法测定化妆品中山梨酸、苯甲酸、对羟基苯甲酸甲酯、对羟基苯甲酸乙酯、对羟基苯甲酸丙酯、对羟基苯甲酸丁酯等6 种防腐剂,用Zorbax ODS柱(150×4.6 mm i.d.,5μm),磷酸二氢钾∶乙腈=90∶10(V/V)为流动相,加入磷酸调pH值为2.0,检测波长254 nm。样品用乙醇水冰乙酸(70∶29.5∶0.5,V/V)提取,回收率为90.8%~105.7%,相对标准偏差为3.1%~8.5%。     

高效液相色谱法同时测定阿胶糕中16种防腐剂

建立高效液相色谱法同时测定阿胶糕中苯甲酸、山梨酸、脱氢乙酸、水杨酸、苯氧异丙醇、2,6-二氯苯甲醇、苯甲酸甲酯、碘丙炔醇丁基氨甲酸酯、对氯间甲酚、2,4-二氯苯甲醇、σ-伞花烃-5-醇、氯二甲酚、氯咪巴唑、苄氯酚、三氯卡班和硫柳汞钠16种防腐剂的分析方法。阿胶糕经提取、除蛋白质等处理后,采用Kromasil C₁₈色谱柱(250 mm×4.6 mm,5 μm)分离,以0.025 mol/L磷酸二氢钠溶液(含0.02 mmol/L EDTA-2Na,pH为3.8)和甲醇为流动相,梯度洗脱,进样体积为10 μL,流量为1.0 mL/min,柱温为30 ℃,采用二极管阵列检测器,检测波长为230 nm。16种防腐剂的质量浓度在20～500 ng/mL范围内与色谱峰面积线性关系良好,相关系数均不小于0.999 5,检出限为1～20 ng/mL,样品平均加标回收率为98.8%～102.5%,测定结果的相对标准偏差为0.78%～2.36%(n=9)。该方法操作简单,分离效果好,可用于阿胶糕中多种防腐剂的同时测定。     

反相高效液相色谱法测定化妆品中的24种防腐剂

建立了同时检测化妆品中24种防腐剂含量的反相高效液相色谱法(RP-HPLC).采用Kromasil C18 (4.6 mm×250 mm,5 μm)色谱柱,以磷酸盐缓冲溶液(pH=4.26)为流动相,梯度洗脱.样品经甲醇超声提取,然后采用RP-HPLC-二极管阵列检测法测定,对样品前处理和色谱条件进行研究和优化.方法的相对标准偏差为1.3%～3.3%;回收率为90.6%～97.8%;各种防腐剂的线性相关系数≥0.9997,具有较高的准确度和精密度,可用于化妆品中24种防腐剂含量的分析.     

反相高效液相色谱法同时测定防晒化妆品中的防腐剂和防晒剂

 用反相高效液相色谱法实现了对化妆品中4种防腐剂（对羟基苯甲酸甲酯、对羟基苯甲酸乙酯、对羟基苯甲酸丙酯、对羟基苯甲酸丁酯）和6种防晒剂（2-羟基-4-甲氧基二苯甲酮-5-磺酸、2-羟基-4-甲氧基二苯甲酮、水杨酸苯酯、对甲氧基肉桂酸辛酯、对二甲基氨基苯甲酸辛酯、水杨酸辛酯）的分离测定。各组分回收率（n=6）为87.2%～106.5%;相对标准偏差（n=6）为1.2%～3.3%。     

高效液相色谱法测定豆制品中2种甜味剂和7种防腐剂

提出了高效液相色谱法测定豆制品中2种甜味剂安赛蜜和糖精钠,7种防腐剂苯甲酸、山梨酸、脱氢乙酸、对羟基苯甲酸甲酯、对羟基苯甲酸乙酯、对羟基苯甲酸丙酯和对羟基苯甲酸丁酯含量的方法。详细叙述了不同样品的前处理方法,以C₁₈色谱柱（250 mm×4.6 mm,5μm）为固定相,以不同比例混合的0.02 mol·L^-1乙酸铵溶液和甲醇的混合物为流动相进行梯度洗脱,采用二极管阵列检测器于波长236 nm处进行测定。9种添加剂的质量浓度均在0.2～50 mg·L^-1范围内与峰面积呈线性关系,检出限（35/N）在0.02～0.07 mg·L^-1之间。方法的加标回收率在97.5%～102%之间;测定值的相对标准偏差（n=10）在0.76%～0.99%之间。     

RP-HPLC在线衍生法测定红景天中痕量铅的研究

铅在人体和动植物组织中能够蓄积,人若每天摄入1mg铅,长此则有中毒危险;过量摄入铅可以引起贫血症、神经功能失调及肾损伤,因此对食品中铅的含量必须严格控制。在环境、食品、化妆品的检测中,铅都是必须检测的指标。在铅矿的开采、冶炼和使用过程中,不可避免地会造成对环境的污染,影响人类和动植物的生命安全。因此,研究样品中铅含量的分析方法,对指导工农业生产和保护环境都有重要意义。目前常用铅的分析方法有原子吸收光谱法、极谱法哺、电感耦合等离子体-质谱法等。     

Simultaneous and rapid determination of the anticarcinogenic proteins Bowman-Birk inhibitor and lectin in soybean crops by perfusion RP-HPLC

There are numerous studies demonstrating a direct association between the ingestion of soybean and low cancer incidence. This fact has been related to the presence of Bowman-Birk inhibitor (BBI) and lectin in soybean. The simultaneous and fast determination of BBI and lectin in soybean is proposed, for the first time, in this work. Two different strategies were designed for the extraction of BBI and lectin: extraction of soybean proteins using a Tris-HCl buffer followed by isolation of BBI and lectin by the isoelectric precipitation of other soybean proteins (method I) or by the direct extraction of BBI and lectin using an acetate buffer (method II). The effect of the previous soybean defating on the extraction of BBI and lectin was also studied. Moreover, the possibility of using a high-intensity focalized ultrasonic probe for accelerating the extraction was explored and an optimization of the extraction time and ultrasound amplitude was performed. The extracts obtained were analysed by RP-HPLC-ESI-MS for the correct identification of BBI and lectin in soybean. Moreover, a fast chromatographic methodology using a perfusion column and UV detection was optimized for the rapid determination of BBI and lectin in soybean. After evaluating its analytical characteristics (linearity, precision, and recovery), the method was applied to the quantitation of BBI and lectin in different soybean varieties.     

RP-HPLC法测定呱氨托美丁及有关物质

建立了呱氨托美丁及有关物质的RP-HPLC检测方法。采用AgilentC18(250mm×4.6mm,5μm)色谱柱,以甲醇-乙腈-0.015mol/L的KH2PO4溶液(V(甲醇)∶V(乙腈)∶V(KH2PO4)=30∶30∶40)(用体积分数8.5%的H3PO4水溶液调至pH5.3)为流动相,检测波长313nm,流速1.0mL/min。呱氨托美丁在10~3000μg/mL范围内,峰面积与质量浓度呈良好线性关系(r=0.9999),平均回收率99.86%,RSD=0.82%。采用反相高效液相色谱法测定呱氨托美丁及有关物质,能有效控制呱氨托美丁的质量。     

RP-HPLC determination of water-soluble vitamins in honey

The assessment and validation of reliable analytical methods for the determination of vitamins in sugar-based matrices (e.g. honey) are still scarcely explored fields of research. This study proposes and fully validates a simple and fast RP-HPLC method for the simultaneous determination of five water-soluble vitamins (vitamin B₂, riboflavin; vitamin B₃, nicotinic acid; vitamin B₅, pantothenic acid; vitamin B₉, folic acid; and vitamin C, ascorbic acid) in honey. The method provides low detection and quantification limits, very good linearity in a large concentration interval, very good precision, and the absence of any bias. It has been successfully applied to 28 honey samples (mainly from Sardinia, Italy) of 12 different botanical origins. While the overall amount of the analytes in the samples is quite low (always below 40 mg kg⁻¹), we have observed a marked dependence of some of their concentrations (i.e. vitamin B₃ and vitamin B₅) and the botanical origin of the honey. This insight might lead to important characterization features for this food item.     

Simultaneous determination of electroactive and non-electroactive food preservatives by novel capillary electrophoresis with amperometric detection

A novel capillary electrophoresis and amperometric detection method was achieved by adding an electroactive additive (3,4-dihydroxybenzylamine, 3,4-DHBA) to the running buffer, so that both electroactive and non-electroactive food preservatives were simultaneously determined. Under the selected optimum conditions, four electroactive preservatives (methylparaben, ethylparaben, propylparaben and butylparaben) and two non-electroactive preservatives (potassium sorbate and sodium lactate) were well separated and sensitively detected with detection limits (S/N = 3) ranging from 1.06 × 10⁻⁸ to 2.73 × 10⁻⁶ g mL⁻¹. This method has been successfully employed for the determination of both electroactive and non-electroactive preservatives in several food commodities.     

Simultaneous determination of synthetic edible pigments in beverages by titania-based RP-HPLC

A rapid method for simultaneous determination of five synthetic edible pigments (SEPs) including tartrazine (TA), ponceau 4R (PO), sunset yellow (SY), brilliant blue (BB) and erythrosine (ER) in beverages with titania-based RP-HPLC has been developed. The good linear relationships were obtained in the concentration ranges of 2.5–40 μg mL⁻¹ for TA, PO and SY, 0.75–12 μg mL⁻¹ for BB, and 1.25–20 μg mL⁻¹ for ER, respectively. The detection limits (LODs) of five SEPs were 0.042, 0.021, 0.042, 0.0005, and 0.021 μg mL⁻¹, respectively. The average recoveries were between 92.2% and 106.3%. Relative standard deviations (RSD, n = 7) for five SEPs were less than 1.18%. The precision and accuracy of the method can meet the requirements of HPLC analysis. In addition, the thermodynamic parameters of retention of the pigments in the titania column such as enthalpy (ΔH^ο), entropy (ΔS^ο) and Gibbs free energy (ΔG^ο) were also determined.     

RP-HPLC determination of lipophilicity in series of quinoline derivatives

In the present paper we describe results on the synthesis and lipophilicity determination of a series of biologically active compounds based on their heterocyclic structure. For synthesis of styrylquinoline-based compounds we applied microwave irradiation and solid phase techniques. The correlation between RP-HPLC retention parameter log k (the logarithm of retention factor k) and log P data calculated in various ways is discussed, as well as, the relationships between the lipophilicity and the chemical structure of the studied compounds.      

气相色谱-质谱法同时测定化妆品中防腐剂和抗氧化剂

采用气相色谱-质谱选择离子监测法(SIS)同时测定化妆品中6种防腐剂和抗氧化剂。用乙酸乙酯为提取剂来进行超声提取。6种防腐剂和抗氧化剂的平均回收率(n＝6)在90％-102％之间。     

决明子药材中大黄酚含量的反相HPLC法测定

以甲醇 -水 (体积比80∶20)为流动相,采用反相高效液相色谱法测定了生、炒决明子中大黄酚的含量 ,平均回收率98.1%,RSD为2.3%(n=5)。方法简便、灵敏、重现性好。     

反相高效液相色谱法测定啤酒中的酚酸

建立了一种利用反相高效液相色谱法同时测定啤酒中10种酚酸的方法。没食子酸、原儿茶酸、儿茶素、香草酸、咖啡酸、丁香酸、表儿茶素、p-香豆酸、阿魏酸和槲皮素等在色谱柱Zorbax Eclipse XDB-C18(4.6 mm i.d.×250mm,5μm),流动相为甲醇/水(含0.1%醋酸),梯度洗脱,流速为1.0 mL/min,280和254 nm紫外检测,除表儿茶素(61.34%)外加标回收率都在96%~130%之间,RSD<5%。该方法可以简便、准确地测定啤酒中的酚酸。