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Comparison of Preston agar and a blood-free selective medium for detection of Campylobacter jejuni in food. 普雷斯顿琼脂与无血选择培养基检测食品中空肠弯曲杆菌的比较。
Journal - Association of Official Analytical Chemists Pub Date : 1991-07-01 DOI: 10.1093/JAOAC/74.4.651
M. Peterz
{"title":"Comparison of Preston agar and a blood-free selective medium for detection of Campylobacter jejuni in food.","authors":"M. Peterz","doi":"10.1093/JAOAC/74.4.651","DOIUrl":"https://doi.org/10.1093/JAOAC/74.4.651","url":null,"abstract":"The present collaborative study compares recovery of Campylobacter jejuni from food in 2 agar media. Six laboratories analyzed 8 samples each of chicken liver inoculated with Campylobacter jejuni. Samples were enriched in Preston broth and isolation was carried out on Preston agar (PA) and campylobacter blood-free selective medium (CBFS), a charcoal-based medium with cefoperazone and amphoteracin as antibiotic supplements. There was no difference in the recovery rate between the 2 agar media; however, the specificity of CBFS was better than that of PA. There was a slightly better growth of campylobacters, and competing organisms were more inhibited on CBFS than on PA.","PeriodicalId":14752,"journal":{"name":"Journal - Association of Official Analytical Chemists","volume":"45 1","pages":"651-4"},"PeriodicalIF":0.0,"publicationDate":"1991-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79712009","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: 16
Lipid globule staining to aid in differentiating Bacillus species. 脂球染色帮助区分芽孢杆菌种类。
Journal - Association of Official Analytical Chemists Pub Date : 1991-07-01
S M Harmon, D A Kautter, G Lancette
{"title":"Lipid globule staining to aid in differentiating Bacillus species.","authors":"S M Harmon,&nbsp;D A Kautter,&nbsp;G Lancette","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>The use of the lipid globule stain to aid in differentiating the Bacillus cereus group (i.e., B. cereus, B. cereus var. mycoides, and B. thuringiensis) from other Bacillus species was investigated. Smears from colonies grown on suitable agar were made on precleaned slides, stained, and examined microscopically for characteristic deep blue lipid globules. The study included a total of 649 cultures of Bacillus species plus 143 incompletely characterized Bacillus isolates from food. Only B. cereus, B. cereus var. mycoides, B. thuringiensis, B. megaterium, and B. sphaericus were consistently positive for lipid globules, although at times, a few cells of B. aneurinolyticus and B. thiaminolyticus were also positive. The lipid globule stain procedure is of value in differentiating Bacillus species, especially when performed by an experienced analyst and used in conjunction with tests for cell and spore morphology.</p>","PeriodicalId":14752,"journal":{"name":"Journal - Association of Official Analytical Chemists","volume":"74 4","pages":"649-51"},"PeriodicalIF":0.0,"publicationDate":"1991-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"12881817","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
A qualitative colorimetric test for brominated vegetable oil in soft drinks. 软饮料中溴化植物油的定性比色试验。
Journal - Association of Official Analytical Chemists Pub Date : 1991-07-01
M N Krishna Murthy, S Rajalakshmi, J A Satyabodha, K V Nagaraja
{"title":"A qualitative colorimetric test for brominated vegetable oil in soft drinks.","authors":"M N Krishna Murthy,&nbsp;S Rajalakshmi,&nbsp;J A Satyabodha,&nbsp;K V Nagaraja","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>A simple and precise method of detecting brominated vegetable oil (BVO) in soft drinks is described. After extraction of BVO using diethyl ether, the concentrated ethereal solution was treated with a small quantity of zinc dust to convert the organic bromide to inorganic form; the solution was subsequently treated with lead dioxide to liberate bromine. The bromine evolved was detected by means of fluorescein-impregnated filter paper strip that turns pink because eosin is formed. The test can detect as low as 10 ppm (2 mg/200 ml) of BVO under experimental conditions. Gas chromatography was carried out on sodium methoxide derivatives prepared from ether extract for quantitation.</p>","PeriodicalId":14752,"journal":{"name":"Journal - Association of Official Analytical Chemists","volume":"74 4","pages":"698-9"},"PeriodicalIF":0.0,"publicationDate":"1991-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13076946","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
Evidence of an unusual pattern of polychlorinated biphenyls in the serum of some residents and canines in Paoli, Pennsylvania. 在宾夕法尼亚州保利的一些居民和犬的血清中发现了不寻常的多氯联苯模式的证据。
Journal - Association of Official Analytical Chemists Pub Date : 1991-07-01 DOI: 10.1093/JAOAC/74.4.577
V. Burse, D. Groce, M. P. Korver, S. Caudill, P. McClure, C. Lapeza, S. Head, R. Schilling, J. A. Farrar, S. Ostrowski
{"title":"Evidence of an unusual pattern of polychlorinated biphenyls in the serum of some residents and canines in Paoli, Pennsylvania.","authors":"V. Burse, D. Groce, M. P. Korver, S. Caudill, P. McClure, C. Lapeza, S. Head, R. Schilling, J. A. Farrar, S. Ostrowski","doi":"10.1093/JAOAC/74.4.577","DOIUrl":"https://doi.org/10.1093/JAOAC/74.4.577","url":null,"abstract":"The present study uses gas liquid chromatography (GLC) electron capture detection with packed and capillary columns to detect polychlorinated biphenyls (PCBs) in serum samples from people living near the electric car repair and maintenance facility of the Southeastern Pennsylvania Transit Authority in Paoli, Pennsylvania. Most of the cohort surveyed had serum patterns similar to patterns for Aroclor 1260 (AR 1260); a small portion (3/89) had patterns indicative of an AR with higher chlorination (e.g., AR 1268). In addition to analyzing serum samples from humans, we also analyzed serum samples from canines (pets of some of the subjects). In general, the serum pattern for canines was less descriptive for AR 1260 than the pattern for humans; however, the pattern for several canines (9/16) was that of the higher chlorinated PCBs (e.g., AR 1268). By using mass spectrometry and capillary column GLC, we confirmed the presence of high molecular weight polychlorinated congeners in both human and animal samples. We were not able to show a statistically significant relationship between serum patterns of PCBs in canines and their owners or between canines and certain behavioral traits (e.g., runs free, retrieves, hours outside, hours inside). However, the correlation between PCBs quantified as AR 1268 and canines' residence time was statistically significant.","PeriodicalId":14752,"journal":{"name":"Journal - Association of Official Analytical Chemists","volume":"25 1","pages":"577-86"},"PeriodicalIF":0.0,"publicationDate":"1991-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90076164","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: 5
Multiresidue matrix solid phase dispersion (MSPD) extraction and gas chromatographic screening of nine chlorinated pesticides in catfish (Ictalurus punctatus) muscle tissue. 多残留基质固相分散(MSPD)提取和气相色谱法筛选鲶鱼肌肉组织中9种氯农药。
Journal - Association of Official Analytical Chemists Pub Date : 1991-07-01 DOI: 10.1093/JAOAC/74.4.667
Austin R. Long, Michael D Crouch, Steven A. Barker
{"title":"Multiresidue matrix solid phase dispersion (MSPD) extraction and gas chromatographic screening of nine chlorinated pesticides in catfish (Ictalurus punctatus) muscle tissue.","authors":"Austin R. Long, Michael D Crouch, Steven A. Barker","doi":"10.1093/JAOAC/74.4.667","DOIUrl":"https://doi.org/10.1093/JAOAC/74.4.667","url":null,"abstract":"A multiresidue technique for extraction and gas chromatographic screening of 9 insecticide (lindane, heptachlor, aldrin, heptachlor epoxide, p,p'-DDE, dieldrin, endrin, p,p'-TDE, and p,p'-DDT) residues in catfish (Ictalurus punctatus) muscle tissue is presented. The 9 insecticides, plus dibutyl chlorendate internal standard, were fortified into catfish muscle tissue (0.5 g) and blended with 2 g C18 (octadecylsilyl derivatized silica reverse-phase material). The C18/muscle tissue matrix blend was fashioned into a column by adding the blend to a 10 mL syringe barrel containing 2 g activated Florisil. The insecticides were then eluted from the column with acetonitrile (8 mL), and a portion (2 microL) of the acetonitrile eluate was then directly analyzed by gas chromatography with electron capture detection. Unfortified blank controls were treated similarly. The resultant extracts contained pesticide analytes (31.25-500 ng/g) free of interfering compounds when analyzed. Correlation coefficients for the 9 extracted pesticide standard curves (linear regression analysis, n = 5) ranged from 0.9967 (+/- 0.0018) to 0.9999 (+/- 0.0001). Average percentage recoveries (82 +/- 4.8% to 97 +/- 3.6%, n = 25 for each insecticide), interassay (5.0 +/- 2.7% to 16.9 +/- 6.5%, n = 25 for each insecticide) and intraassay (1.8 to 4.7%, n = 5 for each insecticide) variabilities were indicative of an acceptable methodology for the analysis and screening of these residues in catfish muscle tissue.","PeriodicalId":14752,"journal":{"name":"Journal - Association of Official Analytical Chemists","volume":"118 1","pages":"667-70"},"PeriodicalIF":0.0,"publicationDate":"1991-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79483904","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: 26
Quantitative determination of amines in wine by liquid chromatography. 酒中胺的液相色谱定量测定。
Journal - Association of Official Analytical Chemists Pub Date : 1991-07-01 DOI: 10.1093/JAOAC/74.4.695
A. Ibe, K. Saito, M. Nakazato, Y. Kikuchi, K. Fujinuma, T. Nishima
{"title":"Quantitative determination of amines in wine by liquid chromatography.","authors":"A. Ibe, K. Saito, M. Nakazato, Y. Kikuchi, K. Fujinuma, T. Nishima","doi":"10.1093/JAOAC/74.4.695","DOIUrl":"https://doi.org/10.1093/JAOAC/74.4.695","url":null,"abstract":"A liquid chromatographic (LC) procedure is described for the determination by dansylation of the following 16 kinds of biogenic amines found in wine: monomethylamine (MM), ethylamine (EM), iso- and n-propylamine (Pr), iso- and n-butylamine (Bu), iso- and n-amylamine (Am), pyrrolidine (PY), 2-phenethylamine (PH), tryptamine (TR), putrescine (PU), cadaverine (CA), histamine (HI), tyramine (TY), and spermidine (SP). The amines in white and red wine were applied to a column of Amberlite CG-50 type I resin (Na-form) after the column had been washed with water and eluted with 1N hydrochloric acid. This eluate was evaporated to dryness under reduced pressure and derivatized with dansyl chloride (DNS). LC separations were performed on Finepak SIL C18S and LiChrosorb RP-8 columns with an acetonitrile-water elution gradient. In the survey of commercial wines by this method, most of the samples were found to contain 12 amines, including iso-Am, CA, PU, TY, and others. The highest levels of these amines were 4.84 micrograms PU/mL in red wine, and 5.11 micrograms iso-Am/mL in white wine. The total levels of amines in red wine were comparatively higher than in white wine.","PeriodicalId":14752,"journal":{"name":"Journal - Association of Official Analytical Chemists","volume":"61 1","pages":"695-8"},"PeriodicalIF":0.0,"publicationDate":"1991-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88370996","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: 38
Determination of carbadox-related residues in swine liver by gas chromatography/mass spectrometry with ion trap detection. 离子阱气相色谱/质谱法测定猪肝中卡巴多相关残留物。
Journal - Association of Official Analytical Chemists Pub Date : 1991-07-01 DOI: 10.1093/JAOAC/74.4.611
M. Lynch, F. R. Mosher, R. Schneider, H. Fouda, J. Risk
{"title":"Determination of carbadox-related residues in swine liver by gas chromatography/mass spectrometry with ion trap detection.","authors":"M. Lynch, F. R. Mosher, R. Schneider, H. Fouda, J. Risk","doi":"10.1093/JAOAC/74.4.611","DOIUrl":"https://doi.org/10.1093/JAOAC/74.4.611","url":null,"abstract":"The ion trap detector (ITD), in combination with a capillary gas chromatograph and under chemical ionization conditions, offers sufficient sensitivity to determine carbadox-related residues as the methyl ester derivative of quinoxaline-2-carboxylic acid at 3 micrograms/kg or higher in porcine liver. A tetradeuterated internal standard of QME effectively compensates for losses incurred during sample preparation. The method produced mean levels of 3.3 (+/- 0.5), 5.5 (+/- 0.8), and 10.1 (+/- 0.9) micrograms/kg for liver fortified at 3, 5, and 10 micrograms/kg. When applied to analysis of samples containing incurred residues of 14C-carbadox at the low microgram/kg level, results were comparable to those obtained by reverse isotope dilution analysis.","PeriodicalId":14752,"journal":{"name":"Journal - Association of Official Analytical Chemists","volume":"48 1","pages":"611-8"},"PeriodicalIF":0.0,"publicationDate":"1991-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77561546","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
Rapid pentachlorophenol evaluation in solid matrixes by second derivative UV spectroscopy for application to wood and leather samples. 固体基质中五氯酚的二阶导数紫外光谱快速评价方法在木材和皮革样品中的应用。
Journal - Association of Official Analytical Chemists Pub Date : 1991-07-01 DOI: 10.1093/JAOAC/74.4.674
M. Secchieri, C. Benassi, S. Pastore, A. Semenzato, A. Bettero, M. Levorato, A. Guerrato
{"title":"Rapid pentachlorophenol evaluation in solid matrixes by second derivative UV spectroscopy for application to wood and leather samples.","authors":"M. Secchieri, C. Benassi, S. Pastore, A. Semenzato, A. Bettero, M. Levorato, A. Guerrato","doi":"10.1093/JAOAC/74.4.674","DOIUrl":"https://doi.org/10.1093/JAOAC/74.4.674","url":null,"abstract":"A method for the quail-quantitative evaluation of pentachlorophenol (PCP) in solid matrixes has been developed. The procedure is based on solid-liquid extraction of solid samples (leather or wood), followed by purification on a cyanopropyl column and determination of the preservative by second derivative UV spectroscopy considering the PCP A peak-through value (304-297 nm). The method allows rapid PCP determination in the concentration range 1-40 micrograms/mL; any matrix interference is avoided by the purification step and recoveries of the preservative were 99.12% (RSD% 0.13) for the leather matrix and 98.03 (RSD% 0.17) for the wood matrix.","PeriodicalId":14752,"journal":{"name":"Journal - Association of Official Analytical Chemists","volume":"28 1","pages":"674-8"},"PeriodicalIF":0.0,"publicationDate":"1991-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87055629","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: 3
Dry rehydratable film for enumeration of total coliforms and Escherichia coli in foods: collaborative study. 用于食品中总大肠菌群和大肠杆菌计数的干燥可再水化薄膜:合作研究。
Journal - Association of Official Analytical Chemists Pub Date : 1991-07-01
M S Curiale, T Sons, D McIver, J S McAllister, B Halsey, D Roblee, T L Fox
{"title":"Dry rehydratable film for enumeration of total coliforms and Escherichia coli in foods: collaborative study.","authors":"M S Curiale,&nbsp;T Sons,&nbsp;D McIver,&nbsp;J S McAllister,&nbsp;B Halsey,&nbsp;D Roblee,&nbsp;T L Fox","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Rehydratable dry-film plating methods for total coliforms and Escherichia coli in foods have been compared to the AOAC most probable number methods. Fourteen laboratories participated in the collaborative study. Three coliform and E. coli levels in 6 samples of 4 product types (flour, nuts, cheese, and beef with gravy) and in 3 samples of 2 product types (mushrooms and raw turkey) were tested in duplicate by the participants. The mean log counts for the 3 methods were comparable. In general, the repeatability and reproducibility variances of the plating methods were as good as or better than that of the MPN method. The method has been adopted official first action by AOAC.</p>","PeriodicalId":14752,"journal":{"name":"Journal - Association of Official Analytical Chemists","volume":"74 4","pages":"635-48"},"PeriodicalIF":0.0,"publicationDate":"1991-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13076940","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
Immunochromatography of fusarochromanone mycotoxins. 褐黄酮真菌毒素的免疫层析。
Journal - Association of Official Analytical Chemists Pub Date : 1991-07-01
J H Yu, F S Chu
{"title":"Immunochromatography of fusarochromanone mycotoxins.","authors":"J H Yu,&nbsp;F S Chu","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>The present paper describes an enzyme-linked immunoassay (ELISA) used in combination with thin-layer chromatography (TLC) and liquid chromatography (LC) for determination of fusarochromanone (TDP) mycotoxins in barley, wheat, and a Fusarium culture grown in rice and corn. The mycotoxins were first extracted from the sample with 100% methanol and subjected to TLC or LC without additional cleanup treatment. Individual fractions eluted from TLC or LC were acetylated, then analyzed by ELISA. Determinations of TDP toxins at levels as low as 0.1 and 0.5 ng were achieved by ELISA in combination with LC and TLC, respectively. The detection limit for TDP-1 in barley and wheat was about 20 ppb by ELISA alone as compared with a detection limit of 5 ppb by a combination of ELISA with either TLC or LC. Overall analytical recovery (% of added) of TDP-1 added to barley and wheat at 5, 10, and 20 ppb of TDP-1 was 106.9 +/- 15.3 and 113.2 +/- 11.6 by LC-ELISA and 108.8 +/- 9.1 and 110.4 +/- 4.9 by TLC-ELISA, respectively. Analysis of extracts obtained from Fusarium equiseti R6137 grown in corn and rice by the combination of TLC and ELISA revealed that diacetyl-TDP was also produced by this fungus in addition to TDP-1 and TDP-2. Comparable results were obtained when fungal extracts were subjected to ELISA, LC, and immunochromatography (i.e., combination of ELISA with either TLC or LC).</p>","PeriodicalId":14752,"journal":{"name":"Journal - Association of Official Analytical Chemists","volume":"74 4","pages":"655-60"},"PeriodicalIF":0.0,"publicationDate":"1991-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13076941","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
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