首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 62 毫秒
1.
目的建立高效液相色谱同时测定糖果、蜜饯和饮料中19种常用食品添加剂的分析方法。方法样品经亚铁氰化钾和乙酸锌溶液沉淀蛋白后,采用Poroshell 120 EC-C18(4.6 mm×100 mm,2.7μm)色谱柱分离,甲醇和0.02 mol/L乙酸铵水溶液为流动相进行梯度洗脱,二极管阵列检测器多波长(230、254、274、480和630 nm)检测,外标法定量。结果 19种食品防腐剂、甜味剂和色素组分得以有效分离。色素和咖啡因线性范围为0.5~12.5 mg/L,对羟基苯甲酸酯类线性范围为1~25 mg/L,其他添加剂线性范围为2~50 mg/L,相关系数均大于0.999。方法检出限为1.0 mg/L,测定低限为10.0 mg/kg。加标回收率为81.4%~110.9%,相对标准偏差值为0.34%~4.6%(n=6)。结论 此方法具有快速、准确且样品处理简单等优点,适用于糖果、蜜饯和饮料中多种添加剂的快速测定。  相似文献   

2.
建立了葡萄酒中10种食品添加剂的高效液相色谱测定法。该方法用水稀释样品,以ZORBAX Eclipse XDB-C18色谱柱(4.6×250 mm,5μm)分离,流动相为5 mmol/L乙酸铵溶液-甲醇(梯度洗脱),二极管阵列检测器进行检测。该方法的检出限1.0 mg/L,线性范围0.50 mg/L~20 mg/L,加标回收率90.0%~108.5%,相对标准偏差为0.48%~4.33%(n=4)。  相似文献   

3.
研究了同时测定果蔬汁饮料中20种禁限用食品添加剂的高效液相色谱方法:采用甲醇-水提取样品中的添加剂,在ZORBAX SB-C18色谱柱上分离,以甲醇-乙酸铵为流动相进行梯度洗脱,采用二极管阵列检测器多波长分析,外标法定量.结果表明,20种添加剂在0.5~50.0μg/m L质量浓度范围内线性关系良好,相关系数大于0.999 0,方法检出限范围0.5~12.5 mg/kg,定量限范围2.5~40.0 mg/kg,平均加标回收率范围80.1%~100.9%,相对标准偏差1.5%~4.9%.对10种市售果蔬汁饮料中添加剂含量测检结果表明,该方法操作简单、检测添加剂种类多、分离效果好、回收率和精密度均满足要求,适用于果蔬汁饮料中多种添加剂的同时检测.  相似文献   

4.
毛细管电泳法测定糖果及调制酒中10种人工合成色素   总被引:2,自引:0,他引:2  
王丽芳  丁晓静  解娜  赵珊  王志 《食品科学》2014,35(14):145-150
建立了糖果及调制酒中10种常用人工合成色素的毛细管电泳-二极管阵列检测新方法。以75μm×70 cm(有效长度60 cm)未涂敷石英毛细管为分离柱,25 min内实现了10种人工合成色素的同时分离与测定。分离电压18 kV,检测波长为214 nm。研究了影响10种人工合成色素分离的因素,如分离缓冲溶液的浓度、pH值及添加剂的浓度等。调制酒样品过膜后直接进样,粉碎后的糖果样品经提取液提取,离心后取上清液直接进样。10种人工合成色素的质量浓度分别在1.0~40.0、1.5~60.0、2.0~80.0、3.0~120.0 mg/L范围内与其对应的校正峰面积呈良好线性关系(r≥0.999 6)。检出限(RSN=3)在0.3~1.0 mg/L之间,定量限(RSN=10)在1.0~3.0 mg/L之间。方法回收率在92.1%~106.5%之间,相对标准偏差(n=5)在0.5%~4.4%之间。本方法简便、准确,适用于常规实验室中糖果及调制酒中常用10种人工合成色素的检测。  相似文献   

5.
目的建立高效液相色谱法同时检测饮料和果冻中9种食品添加剂的分析方法。方法样品用水提取后,加入亚铁氰化钾和乙酸锌溶液沉淀蛋白。使用Agilent ZORBAX Eclipse Plus C18色谱柱(250 mm×4.6 mm,5μm),以甲醇和0.02 mol/L乙酸铵为流动相进行梯度洗脱,二极管阵列检测器变波长检测,外标法定量。结果9种食品添加剂在1.0~100μg/mL范围内有良好的线性,相关系数均在0.9995以上,检出限为0.020~0.431 mg/kg,定量限为0.068~1.312 mg/kg。在3个水平下加标回收率为80.4%~109.7%,相对标准偏差低于5%。结论该方法快速、准确、简便,适用于饮料及果冻中9种添加剂的检测需求。  相似文献   

6.
目的建立高效液相色谱法(high performance liquid chromatography,HPLC)同时快速测定运动饮料中13种食品添加剂的检测方法。方法在40℃柱温,1.0 m L/min流速下,选取phenomenex C18(250 mm×4.6 mm,5μm)色谱柱,在0.02 mol/L乙酸铵(p H 6.86)和甲醇为流动相条件下进行梯度洗脱,采用二极管阵列检测器在230 nm波长处进行检测,外标法定量,实现同时对13种食品添加剂的分离。结果该方法线性良好,相关系数均大于0.990,检出限为0.2~0.5 mg/kg,平均回收率为81.0%~107.7%,相对标准偏差(relative standard deviations,RSDs)为1.00%~5.49%。结论建立的高效液相色谱法满足同时检测运动饮料中13种食品添加剂的要求,操作简单、灵敏度高、重复性好。  相似文献   

7.
建立高效液相色谱法同时检测果脯蜜饯和果冻中10种食品添加剂(山梨酸、苯甲酸、糖精钠、安赛蜜、柠檬黄、苋菜红、胭脂红、诱惑红、日落黄和亮蓝)的分析方法。将待测样品粉碎,经60%甲醇溶液加热回流提取,冷却,过滤后,经ZORBAX SB-Aq色谱柱分离,采用二极管阵列检测器进行检测。用外标法进行定量分析。在优化色谱条件下,8 min即可完成10种食品添加剂的分析测定,各目标物在0.5 mg/L~100 mg/L范围内线性关系良好,相关系数均大于0.999。10种食品添加剂的方法检出限为0.10 mg/kg~0.25 mg/kg,方法定量限为0.30 mg/kg~1.0 mg/kg。在低、中、高3个水平下,样品添加回收试验的平均收率为90%~110%,相对标准偏差均低于10%(n=6)。  相似文献   

8.
目的:建立反相高效液相色谱法同时测定饮料中9种食品添加剂的分析方法。方法:样品经处理后,在ZORBAX SB-C18(4.6mm×250mm×5μm)色谱柱上,以甲醇-三氟乙酸-醋酸铵作为流动相,流速1m L/min,柱温40℃。采用梯度洗脱分离,紫外检测器变波长检测,外标法定量。结果:安赛蜜、柠檬黄、苯甲酸、糖精钠、山梨酸、苋菜红、胭脂红、日落黄、亮蓝在1.0~50mg/L范围内具有良好的线性,9种待测物的回收率在91.0%~103.3%,RSD均小于5.0%,最低定量检出限为0.10mg/kg。结论本方法简便、灵敏、重现性好,能满足实际工作的需要。  相似文献   

9.
建立了饮料中乙基麦芽酚的高效液相色谱测定法。方法采用C18(5μm,4.6mm×250mm i.d)反相色谱柱,流动相(调节流动相pH 4.0)V(甲醇)∶V(0.025moL/L NaH2PO4溶液)=30∶70,流速1.0 mL/min,检测波长276 nm,柱温30℃,进样量50μL。方法的检出限0.25 mg/L,线性范围0~100 mg/mL,加标回收率88.6%~98.8%,相对标准偏差为2.78%。该法具有样品预处理简单,灵敏度高,分析时间短等优点,可用于饮料样品的直接测定。  相似文献   

10.
建立超高效液相色谱同时测定饮料中6种人工合成色素(柠檬黄、苋菜红、胭脂红、日落黄、诱惑红、亮蓝)的方法。饮料用聚酰胺粉吸附色素,除去杂质后用乙醇-氨水-水(7∶2∶1,体积比)洗脱色素,以甲醇-0.02 mol/L乙酸铵为流动相,梯度洗脱,在ACQUITY UPLC~? BEH C_(18)(2.1 mm×50 mm,1.7μm)色谱柱上分离,在254 nm波长处检测。6种色素分离效果良好,线性范围宽,相关系数r≥0.999 5,实际样品加标回收率为82.2%~104.5%,相对标准偏差为0.04%~4.6%。  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.
A 9% whey protein (WP) isolate solution at pH 7.0 was heat-denatured at 80°C for 30 min. Size-exclusion HPLC showed that native WP formed soluble aggregates after heat-treatment. Additions of CaCl2 (10–40 mM), NaCl (50–400 mM) or glucono-delta-lactone (GDL, 0.4–2.0%, w/v) or hydrolysis by a protease from Bacillus licheniformis caused gelation of the denatured solution at 45°C. Textural parameters, hardness, adhesiveness, and cohesiveness of the gels so formed changed markedly with concentration of added salts or pH by added GDL. Maximum gel hardness occurred at 200 mM NaCl or pH 4.7. Increasing CaCl2 concentration continuously increased gel hardness. Generally, GDL-induced gels were harder than salt-induced gels, and much harder than the protease-induced gel.  相似文献   

16.
17.
Capillary electrophoresis (CE) and polarized light microscopy (PLM) were utilized in the detection of the adulteration of locust bean gum with guar gum. For CE analyses, standards of locust bean and guar gums were extracted with 30% CH3CN, removing the residual proteins from the gum matrix. A 8.75 mM NaH2PO4-20.6 mM Na2B4O7 buffer, pH 9, was used to separate these proteins and to identify marker proteins that were present in the guar gum. These markers did not co-migrate with components in the extracts of mechanically processed locust bean gum, and are used as indicators of adulteration. Using PLM with toluidine blue and iodine staining techniques, unadulterated locust bean gum samples were distinguished from mixed samples through the differential staining of components in locust bean versus guar and tara gums. These experiments in the use of CE and PLM provide orthogonal and complementary methods for the verification of 'true' positives and the elimination of 'false' positives.  相似文献   

18.
An investigation is described in which various polyfunctional compounds were applied to wool in attempts to stabilize the temporary improvements in wrinkle-recovery brought about by ‘annealing’. Several reactive systems involving formaldehyde were found to produce the desired permanently improved wrinkle-recovery.  相似文献   

19.
20.
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   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号