Mineral Oil in Foods

1966 ◽  
Vol 49 (4) ◽  
pp. 820-824
Author(s):  
Hymen D Silverberg ◽  
John Marchin ◽  
Walter W Morgenstern
Keyword(s):  
Refractive Index ◽  
Aluminum Oxide ◽  
Collaborative Study ◽  
Mineral Oil ◽  
Bakery Products ◽  
Bakery Product ◽  
Sample Extraction ◽  
Product Separation ◽  
Aluminum Oxide Column ◽  
Mineral Type

Abstract A collaborative study was conducted of the method for mineral oil in foods published in This Journal, 45, 241 (1962). Suggestions and recommendations by the collaborators were evaluated, and necessary reagent and procedural changes were incorporated into the method prior to the current collaborative study. The method now includes the preparation of sample, extraction of the total oils from the dried bakery product, separation of the mineral-type oil from the total by an alkaline aluminum oxide column using petroleum ether, and identification of the dried, weighed, mineraltype oil by infrared and refractive index. The method is considered suitable for detecting small amounts of mineral-type oil in bakery products and is recommended for adoption as official, first action.

Determination of Total Carbohydrates in Wine and Wine-Like Beverages by HPLC with a Refractive Index Detector: First Action 2013.12

2014 ◽  
Vol 97 (2) ◽  
pp. 498-505 ◽  
Author(s):  
Steve Kupina ◽  
Mark Roman ◽  
D Anderson ◽  
S Bhandari ◽  
M S Cardozo ◽  
...  
Keyword(s):  
Refractive Index ◽  
Reference Material ◽  
Organic Acids ◽  
Red Wine ◽  
Collaborative Study ◽  
Ion Exchange Resin ◽  
White Wine ◽  
Negative Control ◽  
Total Carbohydrates

Abstract An international collaborative study was conducted of an HPLC-refractive index (RI) detector method for the determination of the combined amounts of sugars, glycerol, organic acids, and phenolic compounds in wines and wine-like beverages. Nine collaboratinglaboratories representing major winery, contract laboratories, and government laboratories tested eight different materials as blind duplicates using the proposed method. Sample materials included red and white wines, port, wine cooler, and nonalcoholic wine. One material was a negative control, and one material was a reference material. Samples were either treated with an ion-exchange resin to remove interferingorganic acids prior to analysis or left untreated toinclude organic acids and phenolics. Red wine samples were treated with polyvinylpolypyrrolidone to remove potential interferences from phenolics prior to analysis. The HPLC analyses were performed on a Bio-Rad Fast Acid Analysis Column using RI detection. Reproducibility (RSDR) for untreated samples(sugars + phenolics + organic acids) ranged from 6.6% for Titrivin AA4 reference material to 11.0% for dry red wine. RSDR for treated samples (sugars only) ranged from 6.8% for white zinfandel to 18.9% for dry white wine. RSDR for treatedsamples (sugars only) + glycerol ranged from 6.4% for white zinfandel to 19.8% for dry red wine. Based on these results, the method was adopted as Official First Action status for determination of total carbohydrates in wine and wine-like beverages.

Refractive Index of Liquid Aluminum Oxide at 0.6328 mum

1991 ◽  
Vol 74 (4) ◽  
pp. 881-883 ◽  
Author(s):  
Shankar Krishnan ◽  
J. K. Richard Weber ◽  
Robert A. Schiffman ◽  
Paul C. Nordine ◽  
Robert A. Reed
Keyword(s):  
Refractive Index ◽  
Aluminum Oxide ◽  
Liquid Aluminum

Collaborative Study of a Rapid Method for Extraction of Light Filth from Corn Meal, Rye, Pumpernickel, and Buckwheat Flour

1971 ◽  
Vol 54 (4) ◽  
pp. 903-905
Author(s):  
Mary T Miller
Keyword(s):  
Rapid Method ◽  
Collaborative Study ◽  
Mineral Oil ◽  
Corn Meal ◽  
Soxhlet Extractor ◽  
Water Washing ◽  
Yellow Corn ◽  
Alcohol Water ◽  
Buckwheat Flour

Abstract A rapid method based on product defatting in a Soxhlet extractor, hydrolysis in acid-alcohol, water washing, and, finally, separation of light filth in mineral oil has been developed for the separation of light filth from white and yellow corn meal, cracked wheat, rye, pumpernickel, and buckwheat flour. Collaborative results are satisfactory for all products tested; the method has been adopted as official first action.

Thin Layer Chromatographic Method for Determination of Deoxynivalenol in Wheat: Collaborative Study

1986 ◽  
Vol 69 (1) ◽  
pp. 37-40 ◽  
Author(s):  
Robert M Eppley ◽  
Mary W Trucksess ◽  
Stanley Nesheim ◽  
Charles W Thorpe ◽  
Albert E Pohland ◽  
...  
Keyword(s):  
Winter Wheat ◽  
Thin Layer ◽  
Thin Layer Chromatography ◽  
Aluminum Chloride ◽  
Chloride Solution ◽  
Chromatographic Method ◽  
Collaborative Study ◽  
Sample Extraction ◽  
Layer Chromatography

Abstract A collaborative study of a rapid method for the determination of deoxynivalenol (DON) in winter wheat was successfully completed. The method involves sample extraction with acetonitrile-water (84 + 16), cleanup using a disposable column of charcoal, Celite, and alumina, and detection by thin layer chromatography after spraying with an aluminum chloride solution. Each of the 15 collaborators analyzed 12 samples, 2 of which were naturally contaminated, and 10 to which DON was added, in duplicate, at levels of 0,50,100,300, and 1000 ng/ g. Average recoveries of DON ranged from 78 to 96% with repeatabilities of 30-64% and reproducibilities of 33-87%. The results of the study show that false positives were not a problem and that all of the analysts could detect DON at the 300 ng/g level or higher. The method has been adopted official first action.

Determination of Chlorbenside Residues Including Its Sulfoxide and Sulfone Oxidation Products

1966 ◽  
Vol 49 (2) ◽  
pp. 407-412
Author(s):  
Harry Shuman ◽  
Ugo R Cieri
Keyword(s):  
Gas Chromatography ◽  
Acetic Acid ◽  
Acid Solution ◽  
Aluminum Oxide ◽  
Electron Capture ◽  
Acetic Acid Solution ◽  
Extraction Procedure ◽  
Oxidation Products ◽  
Aluminum Oxide Column

Abstract A method is presented for determining residues of chlorbenside including its sulfoxide and sulfone oxidation products. The method employs the Mills-Onley-Gaither extraction procedure. Chlorbenside and chlorbenside sulfoxide are converted to chlorbenside sulfone by a short oxidation with chromic-acetic acid solution. Chlorbenside sulfone is isolated from interfering pesticides and most oxidation products on an aluminum oxide column and determined by electron capture gas chromatography. Recoveries for mixtures of the three components added to apple samples at 0.3–5 ppm (calculated as chlorbenside) were between 92 and 110%.

Collaborative Study of the Extraction of Light Filth From Canned Crabmeat

1976 ◽  
Vol 59 (4) ◽  
pp. 825-826
Author(s):  
Russell G Dent ◽  
J Richard Gorham
Keyword(s):  
Collaborative Study ◽  
Mineral Oil

Abstract Canned crabmeat is boiled with mineral oil in a Wildman trap flask. The trappings are transferred to a Corning percolator and cycled at least 3 times. Average recoveries from 7 collaborators were 82.7 % for rodent hairs and 98.0% for flies. The proposed method has been adopted as official first action.

Determination and Confirmation of Identity of Aflatoxin M1 in Dairy Products: Collaborative Study

1980 ◽  
Vol 63 (4) ◽  
pp. 907-921
Author(s):  
Robert D Stubblefield ◽  
Hans P Van Egmond ◽  
Walter E Paulsch ◽  
Pieter L Schuller ◽  
◽  
...  
Keyword(s):  
Dairy Products ◽  
Rapid Determination ◽  
Collaborative Study ◽  
Test Methods ◽  
Aflatoxin M1 ◽  
Powdered Milk ◽  
Limit Of Determination ◽  
Sample Extraction ◽  
Study Results ◽  
Derivatives Of

Abstract An international collaborative study involving 23 collaborators was conducted to test methods, improved over previous methods with respect to speed and solvent use, for the rapid determination and thin layer chromatographic (TLC) confirmation of aflatoxin M1 identity in dairy products. For the quantitative method, collaborators assayed samples of Couda and cheddar cheeses, powdered milk, and butter containing levels of M1 near the anticipated limit of determination. Statistical analysis of the study results indicated that the lower limit of determination and precision of this method were comparable to these parameters of methods previously approved for analysis for aflatoxin M1. A few collaborators found that M1 eluted early from cleanup columns with cheese and butter samples and that emulsions formed during powdered milk sample extraction. The reasons for these problems have been determined and remedies are provided. For the TLC confirmation of identity method, collaborators prepared trifluoroacetic acid derivatives of M1 on the plates after 2-dimensional development. Concentrations as low as 0.3 ng/g cheese and 1.0 ng/g powdered milk were determined in this study. As a result of this study, both methods have been adopted as official first action methods by the AOAC and as reference methods by IUPAC.

Extraction of Thrips and Other Whole or Equivalent Insects from Frozen Blackberries and Raspberries: Collaborative Study

1981 ◽  
Vol 64 (1) ◽  
pp. 194-195
Author(s):  
Russell G Dent ◽  
◽  
J Boese ◽  
M P Chaput ◽  
D Floyd ◽  
...  
Keyword(s):  
Coefficient Of Variation ◽  
Collaborative Study ◽  
Tween 80 ◽  
Mineral Oil ◽  
Light Mineral

Abstract A method was developed for the extraction of thrips and other whole or equivalent insects from frozen blackberries and raspberries. The method consisted of a thawing and drained weight step, followed by acid maceration. Berries were wet-sieved over a No. 25 sieve nested in a No. 80 sieve. The berry tissue retained on the No. 80 sieve was dehydrated with isopropanol and then treated with chloroform. The chloroform was stripped from the residue with isopropanol. The berry residue was extracted with light mineral oil from a 40% isopropanol-Tween 80- Na4EDTA mixture. The collaborative study was successfully completed with 83.3% average recoveries of thrips and a 19.2% coefficient of variation. The method has been adopted official first action.

Collaborative Study of a New Method for the Extraction of Light Filth from White Flour

1972 ◽  
Vol 55 (3) ◽  
pp. 514-515
Author(s):  
Mary T Miller
Keyword(s):  
Acid Hydrolysis ◽  
Collaborative Study ◽  
Mineral Oil ◽  
New Method ◽  
White Flour

Abstract A new method for the separation of light filth from white flour is based on an autoclave-acid hydrolysis, followed by separation of light fdth elements with mineral oil in a Corning or Kilborn separator. This method is rapid and gives clean papers and good recoveries. The method has been adopted as official first action, to replace 40.045 and 40.046 for extraction of light filth from white flour.

Sign in / Sign up

Export Citation Format

Share Document