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1.
赵云龙 《中国酿造》2021,40(1):183-187
该研究采用高效液相色谱-示差折光检测法测定白酒中的三氯蔗糖含量,从流动相比例、流速、进样量、柱温、示差检测池温度五个方面进行考察,确定最佳色谱条件。结果表明,在流动相为乙腈∶水(20∶80,V/V)、流速1.0 mL/min、进样量20 μL、柱温35 ℃、示差折光检测器温度35 ℃条件下,三氯蔗糖在质量浓度0.01~0.40 mg/mL范围内,线性关系好,相关系数R2=0.999 94,检出限为3.538 μg/mL,定量限为11.79 μg/mL,平均加标回收率为96.3%~103.4%,精密度试验结果相对标准偏差在0.6%~6.6%之间,均能满足检测要求。该方法操作简单、方便快捷、定量准确,适用于白酒中三氯蔗糖含量的大规模、大批量快速检测分析。  相似文献   

2.
高效液相色谱法测定大豆低聚糖中的棉籽糖和水苏糖   总被引:2,自引:0,他引:2  
建立了同时测定大豆低聚糖中棉籽糖和水苏糖含量的高效液相色谱分析方法(HPLC)。采用示差折光检测器(RID),色谱柱为Agilent Zorbax carbohydrate柱(4.6mm×150mm,5μm),流动相为乙腈-水(75:25,V:V),流速1.0mL/min,柱温30℃。实验结果表明:棉籽糖和水苏糖分别在1~10mg/mL、1~10mg/mL范围内线性良好,相关系数分别为0.9925、0.9971;2种糖的相对标准偏差(RSD)分别为1.57%、1.81%(n=5),平均回收率分别为95.8%、96.0%。该分析方法简便,准确、可靠,适用于大豆低聚糖中棉籽糖和水苏糖含量的检测。  相似文献   

3.
建立应用高效液相-示差折光法同时测定米酒中葡萄糖、蔗糖和麦芽糖含量的方法。结果表明当检测器为示差折光检测器,Inert Sustain NH_2氨基色谱柱(250 mm×4.6 mm,5μm),流动相中乙腈和水的体积比为75∶25,流速1.0 mL/min,进样量10μL,检测器和色谱柱温度均为35℃时,混标及米酒样品中的3种糖在10 min内均达到基线分离,最低检测限为0.006 g/100 g,精密性试验相对标准偏差值为0.115%、0.045%和0.220%,重复性试验相对标准偏差值为0.670%、0.429%和0.723%,平均回收率为99.65%、100.85%和99.43%。由此可见,高效液相-示差折光法结果准确可靠,适用于米酒中糖的快速分析。  相似文献   

4.
建立了高效液相色谱-示差折光方法来测定甜菊糖中莱鲍迪苷A含量的实验方法。色谱柱采用WatersNH2柱(250mm×4.6mm,5μm),以乙腈∶水=80∶20为流动相,采用示差折光检测器测定甜菊糖中莱鲍迪苷A的含量。莱鲍迪苷A的线性范围为0.1~1.0mg/mL,检出限为0.03mg/mL,平均加标回收率为98.37%,相对标准偏差0.88%。该方法简单、快速、准确、重现性好,适用于甜菊糖中莱鲍迪苷A的定量分析。  相似文献   

5.
目的建立高效液相色谱法同时测定维生素C泡腾片和咀嚼片中木糖醇、山梨醇和蔗糖的分析方法。方法采用CAPCELL PAK NH_2柱(4.6 mm×250 mm,5μm),以乙腈-水(70:30,V:V)为流动相,流速为1 mL/min,柱温为35℃,示差折光检测器进行检测。结果木糖醇、山梨醇、蔗糖分别在10.50~104.94μg(r=0.9993)、9.98~99.72μg(r=0.9999)、9.72~97.24μg(r=0.9980)范围内呈良好线性关系,检出限均为2μg;平均回收率分别为95.1%、92.7%、92.6%,RSD分别为1.56%、2.22%、1.76%。结论该方法简单、快速、准确,分离度良好,适用于维生素C咀嚼片和泡腾片中山梨醇、木糖醇和蔗糖的含量测定。  相似文献   

6.
食品中蔗糖检测方法的研究   总被引:1,自引:0,他引:1  
采用高效液相色谱仪(配示差折光检测器),摸索出对食品中蔗糖测定的色谱条件和前处理方法,进行准确定量测定的研究。标准曲线有较好的线性关系,方法回收率在95%~105%之间;RSD<3.0%,精密度高;方法最低检出限为0.9g/kg,方法定量限为3.0g/kg。  相似文献   

7.
采用高效液相色谱(high performance liquid chromatography,HPLC)法,利用示差折光检测器(refractiveindex detector,RID)测定紫胶桐酸含量。色谱柱为Agilent ZORBAX SB-C18(4.6mm×250mm,5μm),以V(甲醇):V(水)=60:4 0(0.1%三氟乙酸)作为流动相,流速1 m L/m i n,进样体积1 0μL,柱温3 0℃。结果表明:紫胶桐酸在0.01~1.0mg/mL呈良好的线性关系,R2=0.9994;最低检测限为0.008mg/mL;精密度RSD值为0.86%;平均加标回收率为100.23%,RSD值为0.65%。采用HPLC-RID测定紫胶桐酸的含量,操作简单,结果准确,稳定性和可信度好。  相似文献   

8.
目的改进GB/T5009.149-2003《食品中栀子黄的测定第一法高效液相色谱法》的方法。方法样品经甲醇:甲酸(6:4,V:V)洗脱,采用Angilent Extend C_(18)反相色谱柱(4.6 mm×250 mm,5μm),以甲醇:0.2%氨水(50:50,V:V)为流动相(等度洗脱),流速为1.0 mL/min,进样量20μL,经配有二极管阵列检测器(DAD)的高效液相色谱仪(high performance liquid chromatograph,HPLC)进行测定。结果本方法检出限为3.2 mg/kg,栀子黄中藏花酸和藏花素峰面积的相对标准偏差分别为1.6%、2.5%,在5~50μg/mL范围内有较好的线性,Y=1.34X-0.54,r~2=0.9998,不同浓度的回收率在91.2%~98.4%之间。结论本方法简单、高效、准确度高,回收率和重现性良好,适用检测的食品类别范围较宽,具有推广应用价值。  相似文献   

9.
高效液相色谱法测定甘蔗节间果糖、葡萄糖和蔗糖的含量   总被引:2,自引:0,他引:2  
研究高效液相色谱(HPLC)示差折光检测法测定甘蔗节间糖含量,建立一种简便、快速和准确可靠的,能同时测定果糖、葡萄糖、蔗糖含量的高效液相色谱法。HPLC方法采用Agilent Zorbaxcarbohydrate柱(4.6mm×250mm,5μm),流动相为乙腈-水(75:25,V/V),流速1.0mL/min,柱温30℃,检测器温度35℃。该法相对标准偏差(RSD)为0.82%~0.87%(n=5),加标回收率为97.84%~99.12%,糖类质量浓度在0.625~20mg/mL内呈现良好的线性关系,相关系数在0.9982(n=6)以上。采用本法测定两种甘蔗品种不同时期、不同节间糖含量,均获得满意结果。  相似文献   

10.
利用酶解水解法,建立了婴幼儿配方乳粉(以下简称乳粉)和特殊医学用途婴儿配方食品(以下简称为医学食品)中游离和总色氨酸的高效液相色谱检测方法。样品经蛋白酶水解后,经C18色谱柱(150 mm×4.6 mm, 3.5μm)分离,以甲醇-0.1%乙酸溶液作为流动相等度洗脱,紫外检测器串联荧光检测器检测,外标法定量。结果表明:在质量浓度为0.2~100μg/mL范围内线性关系良好(r2=0.9999)。添加质量分数在100,500,1000 mg/100 g时,色氨酸的回收率介于99.0%~105.3%之间。色氨酸的检出限为1.5 mg/100g,定量限为5 mg/100 g。本方法操作简便,重现性好,可应用于市售乳粉和医学食品中色氨酸含量的测定,填补了检测标准缺失的空白。  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.
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   

18.
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   

19.
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   

20.
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   

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