Showing papers in "Journal of AOAC International in 1989"
64 citations
57 citations
38 citations
TL;DR: The chauffage du PET entraine une migration de composes residuels, nuisibles au consommateur, dans les aliments as discussed by the authors, which comprend une etape de precipitation and la chromatographie liquide.
Abstract: Le chauffage du PET entraine une migration de composes residuels, nuisibles au consommateur, dans les aliments. Le dosage du PET comprend une etape de precipitation et la chromatographie liquide. Conditions operatoires. Application au dosage de ces residus dans les emballages pour produits alimentaires
33 citations
TL;DR: In this article, a definition of l'echantillonnage and principes fondamentaux des procedes d'echillonnages en tenant compte des donnees statistiques, de la manutention des echantillons, de l'ECHANTONnage au laboratoire et des analyses.
Abstract: Definition de l'echantillonnage et principes fondamentaux des procedes d'echantillonnage en tenant compte des donnees statistiques, de la manutention des echantillons, de l'echantillonnage au laboratoire et des analyses. Causes d'erreurs
12 citations
TL;DR: The notion de critere a ete adoptee par la Commission de la CEE pour la detection de residus de substances hormonales ou a action thyrostatique was introduced by as mentioned in this paper.
Abstract: On suggere une nouvelle approche de la validation des methodes analytiques quantitatives. Un critere est adopte pour une methode donnee, par un groupe d'experts. Lorsque l'analyse d'un produit aboutit a ce critere, on peut considerer que la presence de la substance recherchee est prouvee. La notion de critere a ete adoptee par la Commission de la CEE pour la detection de residus de substances hormonales ou a action thyrostatique
12 citations
TL;DR: In this paper, the lysine totale, apres hydrolyse, est dansylee et separee sur colonne C18 and elution isocratique.
Abstract: La lysine totale, apres hydrolyse, est dansylee et separee sur colonne C18 et elution isocratique. La detection s'effectue par fluorescence ; l'acide diaminobutyrique est utilise comme etalon interne. Comparaison des resultats avec ceux obtenus grace a un autoanalyseur d'acides amines
10 citations
TL;DR: In this article, a 0.02 mg/g dose of l'alliin is given for parapharmaceutiques, which is dose par une autre methode.
Abstract: Dosage de l'allicine dans des epices et des produits commercialises parapharmaceutiques. La limite de detection est de 0,02 mg/g. L'alliin, precurseur de l'allicine, est dose par une autre methode
8 citations
TL;DR: In this paper, a large-scale method, using custom-made apparatus, is described for making potassium hydroxide-modified silica gel, which can be used to integrate this adsorbent into many sample-enrichment procedures.
Abstract: A large-scale method, using custom-made apparatus, is described for making potassium hydroxide-modified silica gel. Batches as large as 2,3 kg can be made in 16 man-hours. A smaller-scale version of the method, requiring no specialized apparatus, is also described. The method can be used to integrate this adsorbent into many sample-enrichment procedures
8 citations
TL;DR: Les deux protocoles d'extraction sont equivalents for le dosage de l'eau dans les cereales and les aliments composes for le betail as mentioned in this paper.
Abstract: Les deux protocoles d'extraction sont equivalents pour le dosage de l'eau dans les cereales et les aliments composes pour le betail
7 citations
TL;DR: In this paper, a comparison of caracteristiques of three methodes spectrophotometriques de dosage: methode au dimethyl-3,5-phenol avec mesure a 400 and 450 nm, and techniques au m-hydroxybiphenyle avec ou sans purification.
Abstract: Comparaison des caracteristiques de 3 methodes spectrophotometriques de dosage : methode au dimethyl-3,5-phenol avec mesure a 400 et 450 nm, et techniques au m-hydroxybiphenyle avec ou sans purification. Influence des oses non uroniques (fructose surtout) sur la validite des resultats. La deuxieme methode semble donner les meilleurs resultats
TL;DR: A convenient method for the determination of the N-methyl,N-methoxy-phenylurea herbicide (linuron) in potatoes has been developed and no linuron residues were found in 25 potato samples that were analyzed by this method.
Abstract: A convenient method for the determination of the N-methyl,N-methoxy-phenylurea herbicide (linuron) in potatoes has been developed. The herbicide is extracted from potatoes using a slightly modified Luke multiresidue procedure. The extract is analyzed directly by gas chromatography with cold on-column injection, using an ion trap mass spectrometer in the chemical ionization mode as the detector. Quantitation is performed using p-bromonitrobenzene as the internal standard. The limit of detection is 0.1 ppm. Recoveries of linuron in potatoes averaged 112 +/- 6% at the 0.5 ppm level, and 110 +/- 2% at the 0.2 ppm level. No linuron residues were found in 25 potato samples that were analyzed by this method. Two other N-methyl,N-methoxy-phenylurea herbicides, metobromuron and chlorbromuron, are also sufficiently stable to be determined by this method, but the N,N-dialkyl-phenylurea herbicides neburon, diuron, and monuron are too thermally unstable and degrade in the gas chromatograph.
TL;DR: In this paper, the authors present a technique pouvant remplacer la methode officielle americaine (MEMO) using the vanilline and acides vanillique, p-hydroxybenzoique.
Abstract: Dosage, par chromatographie en phase inversee (CLHP, C8) et detection UV), de la vanilline, des acides vanillique, p-hydroxybenzoique et du parahydroxybenzaldehyde. Les avantages de la methode en font une technique pouvant remplacer la methode officielle americaine
TL;DR: Les echantillons de sols et de sediments de cours d'eau ont ete analyses par chromatographie en phase gazeuse as discussed by the authors, et.
Abstract: Les echantillons de sols et de sediments de cours d'eau ont ete analyses par chromatographie en phase gazeuse
TL;DR: In this paper, a method to isolate and determine N-nitrosodimethylamine (NDMA) in formulations of ferbam or dibam has been developed.
Abstract: A rapid and simple method to isolate and determine N-nitrosodimethylamine (NDMA) in formulations of ferbam or dibam has been developed. Depending on the type of formulation, the sample is extracted or diluted with water which is subsequently extracted with dichloromethane. NDMA is isolated by passing the organic fraction through a silica gel column and eluting the column with acetone. The acetone eluate is analyzed directly for NDMA by using a gas chromatograph connected to a thermal energy analyzer detector (GC/TEA). (…)
TL;DR: In this article, a methodology was developed to reproducibly prepare performance evaluation materials for volatile organics analysis in soils and waters, and Tedlar gas sampling bags were used to prepare the volatile organic spike solutions.
Abstract: Methodology was developed to reproducibly prepare performance evaluation materials for volatile organics analysis in soils and waters. Tedlar gas sampling bags are used to prepare the volatile organics spike solutions. Most volatile organics were well preserved in 3 water samples by storage at refrigerator temperature for 14 days
TL;DR: Le lactose est dialyse contre de l'eau et dose, apres coloration par le reactif de Teles, and ne necessite pas les etapes prealables de precipitation, filtration ou centrifugation as mentioned in this paper.
Abstract: Le lactose est dialyse contre de l'eau et dose, apres coloration par le reactif de Teles. La methode est simple et ne necessite pas les etapes prealables de precipitation, filtration ou centrifugation
TL;DR: In this article, a methode d'analyse permettant de detecter the presence of ce colorant dans les peaux d'agrumes destinees a la consommation is described.
Abstract: Description d'une methode d'analyse permettant de detecter la presence de ce colorant dans les peaux d'agrumes destinees a la consommation. Separation et dosage par chromatographie HPLC en phase inverse
TL;DR: In this paper, the analysis of organic solvent residues in industrial sludges is usually based on preliminary extraction from the matrix, followed by gas chromatographic determination, which is one of the most frequently used methods of recovery.
Abstract: Analysis of organic solvent residues in industrial sludges is usually based on preliminary extraction from the matrix, followed by gas chromatographic determination. Liquid desorption with carbon disulphide is one of the most frequently used methods of recovery. As a large number of variables can affect desorption efficiencies, recoveries from two wastes with different physico-chemical characteristics were evaluated. The loading of solvents affected the desorption efficiencies particularly of polar compounds: the recoveries increased with increased loading. The analyte composition played an important role: recoveries of polar solvents were generally higher in the presence of other polar compounds. The desorption efficiencies of almost all solvents examined increased on decreasing the waste/desorbing agent ratio.
TL;DR: Etude statistique des parametres introduceisant un biais dans les resultats des dosages des metaux lourds dans the huiles et graines comestibles selon ces 2 protocoles normalises.
Abstract: Etude statistique des parametres introduisant un biais dans les resultats des dosages des metaux lourds dans les huiles et graines comestibles selon ces 2 protocoles normalises