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1.
采用反相高效液相色谱法测定鲜皱皮木瓜中齐墩果酸和熊果酸含量,并进行方法学考察.采用Agilent C18 柱(4.6mm×250mm,5μm);流动相:甲醇-1%HAc水溶液(85:15);流速:0.6ml/min;柱温:35℃;检测波长:210nm.齐墩果酸在0.162~6.48 μg范围内线性良好,回归方程为y=512802x 19211(R2=0.9997),平均回收率分别为100.2%,RSD为0.9%(n=6);熊果酸在0.391~15.62μg范围内线性良好,回归方程为y=50865x-5090.4(R2=0.9998),平均回收率为100.0%,RSD为1.1%.该方法简便准确,重现性好,适用于鲜皱皮木瓜中齐墩果酸和熊果酸的定量分析.  相似文献   

2.
HPLC法检测柑橘中赤霉酸残留量的色谱条件   总被引:2,自引:0,他引:2  
在确定了赤霉酸适宜检测波长的基础上,以保留时间、分离度、拖尾因子、谱图峰型、相对标准偏差等为指标.分别考察流动相甲醇与水的体积比、流动相流速及柱温对柑橘中赤霉酸检测结果的影响.结果显示,采用反相C18柱的HPLC法检测赤霉酸的适宜色谱条件为:柱温为35℃,流动相为体积比为40/60的甲醇-水溶液(pH4.0),流速为1.0mL/min,检测波长为210nm.在此条件下,HPLC检测柑橘中赤霉酸含量的灵敏度高(最低检出限0.0334μg,S/N=3),准确度较好(平均加标回收率为86.0%~91.0%,n=5),精密度较高(平均RSD为1.4097%,n=5).  相似文献   

3.
RP-HPLC法测定鸡胚蛋及鸡蛋中性激素的残留量   总被引:1,自引:0,他引:1  
高伟  张培正  宫玮 《食品科学》2008,29(6):364-367
目的:建立了RP-HPLC法测定鸡胚蛋及鸡蛋中己烯雌酚、丙酸睾酮激素残留.方法:采用Waters XTerra C18柱(150mm×4.6mm,5μm),流动相为甲醇:乙腈:水(2:2:1,V/V/V),流速为1ml/min,柱温为40℃,检测波长为240hm.用外标法定量,测定激素残留量.结果与结论:该方法线性范围为0.05~3.500μg/ml,标准曲线线性关系良好,其回归方程和相关系数分别为:己烯雌酚Y=21734x 963.18,R2=0.999l;丙酸睾酮Y=28967x-475.62,R2=0.9995.最低检测限为己烯雌酚0.25ng,丙酸睾酮0.33ng.回收率在78.7%~98.4%之间.相对标准偏差小于2.1%.  相似文献   

4.
高效液相色谱法测定南瓜粉中胡芦巴碱的含量   总被引:1,自引:0,他引:1  
张英春  杨鑫  张华  王静  徐德昌 《食品科学》2008,29(1):280-282
目的:建立高效液相色谱法测定南瓜粉中胡芦巴碱的方法.方法:甲醇超声波提取样品中的胡芦巴碱,色谱柱为Zorbax-NH2(4.6×150mm,5μm),流动相为乙腈-水(80∶20,V∶V),流速为1ml/min,检测波长为265nm.结果:胡芦巴碱浓度在5.01~101.4μg/ml内呈现良好的线性关系,相关系数r=0.9999(n=5);精密度实验RSD=0.31%(n=5);平均回收率为85.28%,RSD=4.4%(n=6);测定三个品系的30个样品中南瓜粉中胡芦巴碱的含量为0.1219~0.4836mg/g.结论:首次建立了高效液相色谱法测定南瓜中胡芦巴碱含量的方法,为南瓜功能性成分开发和遗传育种提供了理论依据.  相似文献   

5.
使用石油醚:丙酮=1:1(v:v)提取胡萝卜中的类胡萝卜素,用RP-高效液相色谱测定成熟期的维生索A原(α-胡萝卜素、β-胡萝卜素)和叶黄素.流动相为甲醇:乙腈=90:10(v:v),流速为0.8mL/min,检测波长为450nm.α-胡萝卜素、β-胡萝卜素和叶黄素的回收率依次为:98.8%、99.3%、99.0%.成熟期胡萝卜中检测到α-胡萝卜素、β-胡萝卜素和叶黄素的含量分别为:190.573、308.930、0.325μg/g.  相似文献   

6.
柱层析法分离纯化大豆磷脂酰胆碱   总被引:3,自引:0,他引:3  
利用硅胶柱层析法,通过梯度洗脱对大豆粉末磷脂中的磷脂酰胆碱进行分离纯化.比较氯仿/甲醇和异丙醇/甲醇两个洗脱体系所得磷脂酰胆碱的纯度和回收率.梯度洗脱时,在氯仿/甲醇体系中氯仿:甲醇的比例为3:2(体积分数),异丙醇/甲醇体系异丙醇:甲醇的比例为1:1(体积分数)洗脱,是获得磷脂酰胆碱的最佳洗脱条件.结果表明:在氯仿,甲醇洗脱体系获得磷脂酰胆碱的纯度为97.0%、回收率为86.5%.异丙醇/甲醇洗脱体系获得磷脂酰胆碱的纯度为95.0%、回收率为83.0%.  相似文献   

7.
目的 建立用高效液相色谱法测定半枝莲中黄芩素含量的方法 .方法 提取药材经酸水解测定其中黄芩素含量;色谱柱Agilent Zorbax SB-C18(5μm,250mm×4.6mm),流动相为甲醇-水(7:3),检测波长335 nm,流速1.0 mL/min.结果 黄芩素在1.26~63.0μg/mL范围内线性关系良好(r=0.999 8),平均回收率为99.6%,RSD=4.44%.结论 此方法 快速简便,重现性好,为半枝莲及其制剂质量控制提供了依据.  相似文献   

8.
为了建立测定羌活中羌活醇和异欧前胡素含量的高效液相色谱法。使用采用高效液相色谱法,色谱柱为YMC-PackODS-A(4.6×250mm5μm),流动相为甲醇:水(50:50),检测波长为310nm。出现羌活醇在0.2400~1.2000μg范围内呈良好的线性关系,r=0.9999(n=5),平均回收率为100.2%,RSD=1.09%(n=6)。异欧前胡素在0.1200~0.6000μg范围内呈良好的线性关系,r=0.9999(n=5),平均回收率为99.8%,RSD=1.49%(n=6)。所以,所用方法灵敏、准确、重现性好、结果可靠,可用于羌活中羌活醇和异欧前胡素的含量测定。  相似文献   

9.
高效液相色谱法检测淮山米粉尿囊素的研究   总被引:1,自引:0,他引:1  
建立测定淮山米粉中尿囊素含量的高效液相色谱分析方法,采用ODS-C18色谱柱(250mm×4.6mm;5μm),流动相为甲醇:水(1:39),检测波长为224nm,柱温30℃,流速0.8mL/min.结果显示,尿囊素在0.24μg~2.40μg间线性关系良好,回归方程为y=0.02743x-0.0035,r=0.9999,尿囊素回收率为94.12%~99.69%.该方法简便、快速、准确,可作为淮山米粉质量控制的可靠手段之一.  相似文献   

10.
研究龙牙肝泰胶囊中齐墩果酸的HPLC定量分析方法。色谱柱:SunFireC1(84.6mm×150mm,5μm),柱温:35℃,流动相:甲醇:水(90:10),用磷酸调PH到3.2±0.2;流速:1.0mL/min,检测波长:210nm。结果表明,齐墩果酸对照品在0.984~9.84μg呈良好的线性关系,回归方程为Y=10056.12X-1968.77,r=0.9999(n=6),平均回收率为97.59%,RSD为1.47%。  相似文献   

11.
Since grapevine ( Vitis spp .) rootstock material is being traded increasingly as disbudded woody material a lack of distinctive morphological features on such material necessitates an alternative and reliable means of identification. Methods described here were developed for rapid and efficient extraction of DNA from woody samples rich in phenolic compounds and polysaccharides, and for subsequent identification of varieties by RAPD PCR. Using these methods, and with the application of only one selected RAPD primer, we were able to differentiate sixteen rootstock varieties, including the seven varieties most commonly used in Germany. Problems commonly encountered with reproducibility of RAPD patterns were avoided by choosing primers with a dinucleotide sequence and a high G/C content that allowed a rather high annealing temperature of 45°C. Methods described here should also be useful for other horticultural crops, especially those with woody tissues rich in phenolic compounds and polysaccharides.  相似文献   

12.
An internet website (http://cpf.jrc.it/smt/) has been produced as a means of dissemination of methods of analysis and supporting spectroscopic information on monomers and additives used for food contact materials (principally packaging). The site which is aimed primarily at assisting food control laboratories in the European Union contains analytical information on monomers, starting substances and additives used in the manufacture of plastics materials. A searchable index is provided giving PM and CAS numbers for each of 255 substances. For each substance a data sheet gives regulatory information, chemical structures, physico-chemical information and background information on the use of the substance in particular plastics, and the food packaging applications. For monomers and starting substances (155 compounds) the infra-red and mass spectra are provided, and for additives (100 compounds); additionally proton NMR are available for about 50% of the entries. Where analytical methods have been developed for determining these substances as residual amounts in plastics or as trace amounts in food simulants these methods are also on the website. All information is provided in portable document file (PDF) format which means that high quality copies can be readily printed, using freely available Adobe Acrobat Reader software. The website will in future be maintained and up-dated by the European Commission's Joint Research Centre (JRC) as new substances are authorized for use by the European Commission (DG-ENTR formerly DGIII). Where analytical laboratories (food control or other) require reference substances these can be obtained free-ofcharge from a reference collection housed at the JRC and maintained in conjunction with this website compendium.  相似文献   

13.
The characterization of the aromatic profile of several apricot cultivars with molecular tracers in order to obtain objective data concerning the aromatic quality of this fruit was undertaken using headspace–solid phase microextraction (HS–SPME). Six apricot cultivars were selected according to their organoleptic characteristics: Iranien, Orangered, Goldrich, Hargrand, Rouge du Roussillon and A4025. The aromatic intensity of these varieties measured by HS–SPME–Olfactometry were defined and classified according to the presence and the intensity of grassy, fruity and apricot like notes. In the six varieties, 23 common volatile compounds were identified by HS–SPME–GC–MS. Finally, 10 compounds, ethyl acetate, hexyl acetate, limonene, β-cyclocitral, γ-decalactone, 6-methyl-5-hepten-2-one, linalool, β-ionone, menthone and (E)-hexen-2-al were recognized by HS–SPME–GC–O as responsible of the aromatic notes involved in apricot aroma and considered as molecular tracers of apricot aromatic quality which could be utilized to discriminate apricot varieties.  相似文献   

14.
The advent of the functional barrier concept in food packaging has brought with it a requirement for fast tests of permeation through potential barrier materials. In such tests it would be convenient for both foodstuffs and materials below the functional barrier (sub-barrier materials) to be represented by standard simulants. By means of inverse gas chromatography, liquid paraffin spiked with appropriate permeants was considered as a potential simulant of sub-barrier materials based on polypropylene (PP) or similar polyolefins. Experiments were performed to characterize the kinetics of the permeation of low molecular weight model permeants (octene, toluene and isopropanol) from liquid paraffin, through a surrogate potential functional barrier (25 μm-thick oriented PP) into the food simulants olive oil and 3% (w/v) acetic acid. These permeation results were interpreted in terms of three permeation kinetic models regarding the solubility of a particular model permeant in the post-barrier medium (i.e. the food simulant). The results obtained justify the development and evaluation of liquid sub-barrier simulants that would allow flexible yet rigorous testing of new laminated multilayer packaging materials.  相似文献   

15.
16.
BADGE.2HCl and BFDGE.2HCl were determined in 28 samples of ready-to-drink canned coffee and 18 samples of canned vegetables (10 corn, 5 tomatoes and 3 others), all from the Japanese market. HPLC was used as the principal analytical method and GCMS for confirmation of relevant LC fractions. BADGE.2HCl was found to be present in one canned coffee and five samples of corn, BFDGE.2HCl in four samples of canned tomatoes and in one canned corn. No sample was found which exceeded the 1mg/kg limit of the EU for the BADGE chlorohydrins. However the highest concentration was found for the sum of BFDGE.2HCl and BFDGE.HCl.H2O at a level of 1.5mg/kg. A Beilstein test confirmed that all cans containing foods contaminated with BADGE.2HCl or BFDGE.2HCl had at lest one part coated with a PVC organosol.  相似文献   

17.
A strong science base is required to underpin the planning and decision-making process involved in determining future European community legislation on materials and articles in contact with food. Significant progress has been made in the past 5 years in European funded work in this area, with many developments contributing to a much better understanding of the migration process, and better and simpler approaches to food control. In this paper this progress is reviewed against previously identified work-areas (identified in 1994) and conclusions are reached about future requirements for R&D to support legislation on food contact materials and articles over the next 5 or so years.  相似文献   

18.
19.
This paper describes the second part of a project undertaken to develop certified mussel reference materials for paralytic shellfish poisoning toxins. In the first part two interlaboratory studies were undertaken to investigate the performance of the analytical methodology for several PSP toxins, in particular saxitoxin and decarbamoyl-saxitoxin in lyophilized mussels, and to set criteria for the acceptance of results to be applied during the certification exercise. Fifteen laboratories participated in this certification study and were asked to measure saxitoxin and decarbamoyl-saxitoxin in rehydrated lyophilized mussel material and in a saxitoxin-enriched mussel material. The participants were allowed to use a method of their choice but with an extraction procedure to be strictly followed. The study included extra experiments to verify the detection limits for both saxitoxin and decarbamoyl-saxitoxin. Most participants (13 of 15) were able to meet all the criteria set for the certification study. Results for saxitoxin.2HCl yielded a certified mass fraction of <0.07 mg/kg in the rehydrated lyophilized mussels. Results obtained for decarbamoyl-saxitoxin.2HCl yielded a certified mass fraction of 1.59+/-0.20 mg/kg. The results for saxitoxin.2HCl in enriched blank mussel yielded a certified mass fraction of 0.48 +/- 0.06 mg/kg. These certified reference materials for paralytic shellfish poisoning toxins in lyophilized mussel material are the first available for laboratories to test their method for accuracy and performance.  相似文献   

20.
<正>We are pleased to announce the launch of a new international peer-reviewed journal-Food Science and Human Wellness,ISSN 2213-4530,which is an open access journal,produced and hosted by Elsevier B.V.on behalf of Beijing Academy of Food Sciences.Food Science and Human Wellness is an international peer-reviewed English journal that provides a forum for the dissemination of the  相似文献   

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