Journal - Association of Official Analytical Chemists最新文献_第3页

A new approach to the study of glucosinolates by isocratic liquid chromatography. Part I. Rapid determination of desulfated derivatives of rapeseed glucosinolates. 等密度液相色谱法研究硫代葡萄糖苷的新方法。第一部分快速测定油菜籽硫代葡萄糖苷的脱硫衍生物。

Journal - Association of Official Analytical Chemists Pub Date : 1991-11-01

A Quinsac, D Ribaillier, C Elfakir, M Lafosse, M Dreux

{"title":"A new approach to the study of glucosinolates by isocratic liquid chromatography. Part I. Rapid determination of desulfated derivatives of rapeseed glucosinolates.","authors":"A Quinsac, D Ribaillier, C Elfakir, M Lafosse, M Dreux","doi":"","DOIUrl":"","url":null,"abstract":"Liquid chromatographic (LC) analysis of desulfated derivatives of rapeseed glucosinolates has been carried out under isocratic elution conditions with different CN-bonded stationary phases. The effects of the eluant composition (water, acetonitrile, and methanol) with the stationary phase (Zorbax CN, Lichrospher CN, and Ultrasphere CN) and temperature (20 and 50 degrees C) are described. An isocratic LC method performed at room temperature using a Lichrospher CN column and water as mobile phase is proposed. The chromatographic analysis can be done in less than 12 min, and it is easier and less expensive than the traditional gradient mode. Four commercial samples of rapeseed containing various quantities of other cruciferous seeds (wild mustard and stinkweed) as an admixture have been analyzed to determine the total glucosinolate content. Relative standard deviations of repeatability of the isocratic and gradient LC methods ranged from 0.4 to 1.7% and from 2.7 to 4.7%, respectively. Comparison of the results showed good agreement between the 2 methods (beter than 98%).","PeriodicalId":14752,"journal":{"name":"Journal - Association of Official Analytical Chemists","volume":"74 6","pages":"932-9"},"PeriodicalIF":0.0,"publicationDate":"1991-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"12920237","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Limited survey of residual tetracyclines in tissues collected from diseased animals in Aichi Prefecture, Japan. 日本爱知县患病动物组织中残留四环素的有限调查。

Journal - Association of Official Analytical Chemists Pub Date : 1991-11-01 DOI: 10.1093/JAOAC/74.6.894

H. Oka, Y. Ikai, N. Kawamura, J. Hayakawa

引用次数: 7

Potassium as an index of fruit content in baby food products. Part I. Banana-containing and apricot-containing products. 钾作为婴儿食品中水果含量的指标。第一部分:含香蕉和含杏的产品。

Journal - Association of Official Analytical Chemists Pub Date : 1991-11-01 DOI: 10.1093/JAOAC/74.6.929

R. Harvey, R. Theuer

{"title":"Potassium as an index of fruit content in baby food products. Part I. Banana-containing and apricot-containing products.","authors":"R. Harvey, R. Theuer","doi":"10.1093/JAOAC/74.6.929","DOIUrl":"https://doi.org/10.1093/JAOAC/74.6.929","url":null,"abstract":"Percentage ingredient labeling has been proposed for baby foods. We determined whether or not the potassium content of baby foods could be used to verify the quantity of fruit when the characterizing ingredients were apricots or bananas, fruits rich in potassium. Official values for potassium in fruit (USDA Handbook No. 8-9) did not agree well with actual analyses. The potassium levels of products of known composition were accurately predicted from analyses of the actual ingredients used to make the foods. For banana-containing monofruit products of variable or unknown composition, potassium analysis led to fruit level estimates consistent with either the known composition or the label declaration. For products of unknown composition made with apricot concentrate, however, potassium analysis led to fruit level estimates lower than the probable fruit content. The quantity of fruit in baby foods made with potassium-rich fruits can be estimated from the potassium content if the potassium value for the fruit is representative of the actual ingredients used to make the product. If potassium analysis is to be used to verify compliance with percentage ingredient labeling, there must be statutory specification of the single-strength fruit level for fruit reconstituted from concentrate.","PeriodicalId":14752,"journal":{"name":"Journal - Association of Official Analytical Chemists","volume":"27 1","pages":"929-32"},"PeriodicalIF":0.0,"publicationDate":"1991-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80685707","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Potassium as an index of fruit content in baby food products. Part I. Banana-containing and apricot-containing products. 钾作为婴儿食品中水果含量的指标。第一部分:含香蕉和含杏的产品。

Journal - Association of Official Analytical Chemists Pub Date : 1991-11-01

R A Harvey, R C Theuer

{"title":"Potassium as an index of fruit content in baby food products. Part I. Banana-containing and apricot-containing products.","authors":"R A Harvey, R C Theuer","doi":"","DOIUrl":"","url":null,"abstract":"Percentage ingredient labeling has been proposed for baby foods. We determined whether or not the potassium content of baby foods could be used to verify the quantity of fruit when the characterizing ingredients were apricots or bananas, fruits rich in potassium. Official values for potassium in fruit (USDA Handbook No. 8-9) did not agree well with actual analyses. The potassium levels of products of known composition were accurately predicted from analyses of the actual ingredients used to make the foods. For banana-containing monofruit products of variable or unknown composition, potassium analysis led to fruit level estimates consistent with either the known composition or the label declaration. For products of unknown composition made with apricot concentrate, however, potassium analysis led to fruit level estimates lower than the probable fruit content. The quantity of fruit in baby foods made with potassium-rich fruits can be estimated from the potassium content if the potassium value for the fruit is representative of the actual ingredients used to make the product. If potassium analysis is to be used to verify compliance with percentage ingredient labeling, there must be statutory specification of the single-strength fruit level for fruit reconstituted from concentrate.","PeriodicalId":14752,"journal":{"name":"Journal - Association of Official Analytical Chemists","volume":"74 6","pages":"929-32"},"PeriodicalIF":0.0,"publicationDate":"1991-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"12920993","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Monitoring aldehyde production during frying by reversed-phase liquid chromatography. 反相液相色谱法监测煎炸过程中醛的生成。

Journal - Association of Official Analytical Chemists Pub Date : 1991-11-01 DOI: 10.1093/JAOAC/74.6.957

Ralph H Lane, Janis L Smathers

{"title":"Monitoring aldehyde production during frying by reversed-phase liquid chromatography.","authors":"Ralph H Lane, Janis L Smathers","doi":"10.1093/JAOAC/74.6.957","DOIUrl":"https://doi.org/10.1093/JAOAC/74.6.957","url":null,"abstract":"Acrolein (2-propenal) and other low molecular weight aldehydes (LMWAs) formed by degradation of the frying medium (triglycerides) were monitored by liquid chromatography (LC) during preparation of fried items. LMWA contents of coatings from codfish and of doughnuts and their volatiles that codistill with steam are monitored by trapping the vapors and distillate from the food matrix in a 2,4-dinitrophenylhydrazine solution. The resulting hydrazones are partitioned from the aqueous phase, first into isooctane and then into acetonitrile for LC analysis. The hydrazones are separated and quantified on a C18 reversed-phase column with acetonitrile-water as the mobile phase. LMWAs are confirmed by gas chromatography/mass spectrometry. No difference was found in LMWA content in coatings from fish fillets fried at 182 or 204 degrees C. Cake doughnuts were higher in acrolein content than yeast-raised doughnuts prepared under similar conditions. Freshness of the frying medium, frying time, and batch size did not seem to influence LMWA production from doughnuts. Results indicated that most of the LMWAs formed codistilled with steam during frying rather than remaining with the food item.","PeriodicalId":14752,"journal":{"name":"Journal - Association of Official Analytical Chemists","volume":"36 1","pages":"957-60"},"PeriodicalIF":0.0,"publicationDate":"1991-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79801156","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 17

Assay of oxolinic acid residues in salmon muscle by liquid chromatography with fluorescence detection: interlaboratory study. 荧光液相色谱法测定鲑鱼肌肉中氧喹啉酸残留量:实验室间研究。

Journal - Association of Official Analytical Chemists Pub Date : 1991-11-01 DOI: 10.1093/JAOAC/74.6.906

G. Carignan, L. Larocque, S. Sved

{"title":"Assay of oxolinic acid residues in salmon muscle by liquid chromatography with fluorescence detection: interlaboratory study.","authors":"G. Carignan, L. Larocque, S. Sved","doi":"10.1093/JAOAC/74.6.906","DOIUrl":"https://doi.org/10.1093/JAOAC/74.6.906","url":null,"abstract":"A previously developed method that uses a simplified sample preparation and fluorometric detection of liquid chromatographic eluates for the determination of oxolinic acid in salmon muscle has been collaboratively studied. Five laboratories participated in the study to analyze, in quintuplicate, blank salmon muscle fortified at 10, 20, 50, and 100 micrograms/kg (ppb), and 2 incurred samples from salmon given feed with medicated oxolinic acid. The tissue, 2 g mixed with 2 g Na2SO4, is extracted with ethyl acetate and centrifuged, and the solvent is evaporated. The residue is partitioned in a mixture of hexane and 0.01 M oxalic acid, and the aqueous phase is chromatographed using fluorescence detection at 327 nm excitation and 369 nm emission. Mean recoveries ranged from 77.2 to 84.5% in spiked samples with reproducibility relative standard deviation (RSDR) ranging from 11.5 to 18.3%. Treated salmon were found to contain 8.71 and 53.8 micrograms/kg with RSDR of 18.6 and 16.7%, respectively. The corresponding repeatability relative standard deviations (RSDR) were 5.8-12.2%, and 7.7 and 6.2%. The method is recommended for regulatory purposes in Canada.","PeriodicalId":14752,"journal":{"name":"Journal - Association of Official Analytical Chemists","volume":"16 1","pages":"906-9"},"PeriodicalIF":0.0,"publicationDate":"1991-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72896445","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

A new approach to the study of glucosinolates by isocratic liquid chromatography. Part I. Rapid determination of desulfated derivatives of rapeseed glucosinolates. 等密度液相色谱法研究硫代葡萄糖苷的新方法。第一部分快速测定油菜籽硫代葡萄糖苷的脱硫衍生物。

Journal - Association of Official Analytical Chemists Pub Date : 1991-11-01 DOI: 10.1093/JAOAC/74.6.932

A. Quinsac, D. Ribaillier, C. Elfakir, M. Lafosse, M. Dreux

{"title":"A new approach to the study of glucosinolates by isocratic liquid chromatography. Part I. Rapid determination of desulfated derivatives of rapeseed glucosinolates.","authors":"A. Quinsac, D. Ribaillier, C. Elfakir, M. Lafosse, M. Dreux","doi":"10.1093/JAOAC/74.6.932","DOIUrl":"https://doi.org/10.1093/JAOAC/74.6.932","url":null,"abstract":"Liquid chromatographic (LC) analysis of desulfated derivatives of rapeseed glucosinolates has been carried out under isocratic elution conditions with different CN-bonded stationary phases. The effects of the eluant composition (water, acetonitrile, and methanol) with the stationary phase (Zorbax CN, Lichrospher CN, and Ultrasphere CN) and temperature (20 and 50 degrees C) are described. An isocratic LC method performed at room temperature using a Lichrospher CN column and water as mobile phase is proposed. The chromatographic analysis can be done in less than 12 min, and it is easier and less expensive than the traditional gradient mode. Four commercial samples of rapeseed containing various quantities of other cruciferous seeds (wild mustard and stinkweed) as an admixture have been analyzed to determine the total glucosinolate content. Relative standard deviations of repeatability of the isocratic and gradient LC methods ranged from 0.4 to 1.7% and from 2.7 to 4.7%, respectively. Comparison of the results showed good agreement between the 2 methods (beter than 98%).","PeriodicalId":14752,"journal":{"name":"Journal - Association of Official Analytical Chemists","volume":"20 1","pages":"932-9"},"PeriodicalIF":0.0,"publicationDate":"1991-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82578960","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 10

Comparison of automated liquid chromatographic and bioassay methods for determining spiramycin concentration in bovine plasma. 自动液相色谱法和生物测定法测定牛血浆中螺旋霉素浓度的比较。

Journal - Association of Official Analytical Chemists Pub Date : 1991-11-01 DOI: 10.1093/JAOAC/74.6.912

P. Sanders, G. Moulin, C. Gaudiche, B. Delepine, D. Mourot

引用次数: 2

Monitoring aldehyde production during frying by reversed-phase liquid chromatography. 反相液相色谱法监测煎炸过程中醛的生成。

Journal - Association of Official Analytical Chemists Pub Date : 1991-11-01

R H Lane, J L Smathers

引用次数: 0

Improved method for determination of polynuclear aromatic hydrocarbons in pharmacopoeial paraffin and mineral oils. 药典石蜡和矿物油中多核芳烃测定方法的改进。

Journal - Association of Official Analytical Chemists Pub Date : 1991-11-01

A Geahchan, I Le Gren, P Chambon, R Chambon

引用次数: 0