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.

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.

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.

Extraction of Light Filth from Whole Peppermint Leaves: Collaborative Study

1985 ◽  
Vol 68 (4) ◽  
pp. 697-698
Author(s):  
Jack Boese ◽  
Marvin Nakashima ◽  
Larry E Glaze
Keyword(s):  
Collaborative Study ◽  
Tween 80 ◽  
Mineral Oil ◽  
Isopropanol Solution ◽  
Wet Sieving

Abstract Results are reported for a collaborative study of a method for the extraction of light filth from whole peppermint leaves. A 5 g sample is defatted with isopropanol in a simple reflux appartus. Rat hairs, insect fragments, and whole insects are isolated by wet sieving on a No. 230 sieve, a deaerating boil in 40% isopropanol solution, flotation with Tween 80-Na4edta (1 + 1) and mineral oil-heptane (85 + 15), and trappings in a Wildman trap flask. Average recoveries obtained by 6 collaborators for 3 spike levels of rat hairs (5,10,15) were 83.3, 87.5, and 82.2%, respectively. For whole insects (5,10,15) recoveries averaged 85.0, 80.0 and 77.2% respectively; for insect fragments (20, 30, 50) recoveries averaged 79.6, 88.3, and 84.8%, respectively. The average recoveries for the 3 levels of each analyte were not significantly different. The method has been adopted official first action.

Collaborative Study of a New Method for Extraction of Light Filth from Reconditioned (Coarsely Ground) Nutmeg

1971 ◽  
Vol 54 (3) ◽  
pp. 575-578
Author(s):  
Alberto W Vazquez
Keyword(s):  
Collaborative Study ◽  
Mineral Oil ◽  
New Method ◽  
Official Method ◽  
Collaborative Testing

Abstract A new method has been developed for extraction of light filth from coarsely ground nutmeg. Nutmeg tissue is defatted by 3 successive 10 min extractions with boiling CHCI3, after which the solvent is removed by aspiration and an isopropanol rinse. Following sieving on a No. 230 sieve and a brief deaeration and hydrolysis step in acidified boiling 60% ethanol-CaCl2, light filth elements are extracted with mineral oil from the 60% ethanol-CaCl2 mixture. Collaborative testing of the proposed method yielded satisfactory recoveries of added light filth elements. The official method for ground spices, 40.106(b), was compared in a collaborative study with the proposed method for the analysis of ground nutmeg and mace. Results were encouraging, but further study is indicated. The method as described for reconditioned nutmeg has been adopted as official first action.

Extraction of Light Filth from Oriental Sauces Containing Soy Sauce, Thickeners, and Spices: Collaborative Study

1993 ◽  
Vol 76 (1) ◽  
pp. 47-49
Author(s):  
Marvin J Nakashima ◽  
◽  
J A Gallman ◽  
R R Haynos ◽  
C E Highfield ◽  
...  
Keyword(s):  
Collaborative Study ◽  
Steam Bath ◽  
Mineral Oil ◽  
Soy Sauce ◽  
Test Portion ◽  
Wet Sieving

Abstract Results are reported for a collaborative study of a method for the extraction of light filth from oriental sauces containing soy sauce, thickeners, and spices. A100 g test portion is pretreated in a 2% solution of Tergitol Anionic 4 over a steam bath, and oils are removed by wet-sieving on No. 230 sieve. Filth is isolated from 40% isopropanol by using Na4EDTA and mineral oil. Average recoveries by 9 collaborators for 3 spike levels of rat hairs (5,10, and 15) were 84, 78, and 79%, respectively; for insect fragments (5,15, and 30), recoveries were 92, 95, and 96%, respectively. The method was adopted first action by AOAC International.

Collaborative Study of a Method for the Extraction of Light Filth from Ground Mace and Ground Caraway Seed

1976 ◽  
Vol 59 (4) ◽  
pp. 827-829
Author(s):  
Joel J Thrasher
Keyword(s):  
Collaborative Study ◽  
Mineral Oil ◽  
New Method ◽  
Filter Papers

Abstract A new method has been developed for the extraction of light filth from ground mace and ground caraway seed. The method uses a 2-step chloroform-isopropanol pretreatment followed by separation of the light filth from 40% isopropanol with mineral oil. The collaborative study resulted in clean filter papers with more reproducible recoveries of light filth elements than the official first action method, 44.116(b). The method has been adopted as official first action.

Collaborative Study of a Method for the Extraction of Light Filth from Crushed Red Peppers

1975 ◽  
Vol 58 (3) ◽  
pp. 445-446
Author(s):  
Joel J Thrasher
Keyword(s):  
Collaborative Study ◽  
Mineral Oil ◽  
New Method ◽  
Collaborative Studies ◽  
Red Peppers

Abstract A new method was developed for the extraction of light filth from crushed red peppers. The method utilizes an isopropanol defatting of the product followed by separation of light filth elements with mineral oil and n-heptane (85+15) in a 2 L trap flask. Collaborative studies resulted in good recoveries of light filth spike elements and clean extraction papers. The method has been adopted as official first action.

Extraction of Light Filth from Tea: Collaborative Study

1981 ◽  
Vol 64 (2) ◽  
pp. 287-290
Author(s):  
Faith F Lim ◽  
◽  
J Barnett ◽  
A Bright ◽  
M P Chaput ◽  
...  
Keyword(s):  
Sample Preparation ◽  
Collaborative Study ◽  
Tween 80 ◽  
Mineral Oil ◽  
Plant Residue ◽  
Official Method ◽  
Existing Problems ◽  
Aoac Method ◽  
Filter Papers ◽  
Wet Sieving

Abstract The present AOAC method for determining insect and rodent filth in tea is time-consuming because it produces filter papers which are heavy in plant residue and therefore requires long paper-reading times. Anew method for the analysis of light filth in tea was developed to remedy existing problems and to improve recoveries. The method consists of the following steps: sample preparation, wet sieving, dilution with 40% isopropanol, extraction with Tween 80-Na4EDTA-40% isopropanol, flotation with mineral oil-heptane, and trapping off in a Wildman trap flask. In an interlaboratory collaborative study, analysts reported combined insect fragment recoveries of 99.2% for the proposed method and 93.0% for the AOAC method; the same analysts recorded combined rodent hair recoveries of 92.2% for the proposed method and 47.6% for the official method. Average times for reading individual subsamples were 9 min for the proposed method and 27 min for the AOAC method. The proposed method has been adopted official first action.

Extraction of Light Filth from Barley, Oatmeal, and Mixed Dry Infant Cereals: Collaborative Study

1980 ◽  
Vol 63 (2) ◽  
pp. 187-188
Author(s):  
Russell G Dent ◽  
◽  
D M Floyd ◽  
J Nagy ◽  
A R Olsen ◽  
...  
Keyword(s):  
Collaborative Study ◽  
Mineral Oil ◽  
New Method ◽  
Interlaboratory Studies ◽  
Light Mineral ◽  
Wet Sieving

Abstract A new method has been developed for the extraction of light filth from oatmeal, barley, and mixed dry infant cereals which involves HC1 digestion followed by wet sieving. The residue is defatted in a paper cup, using isopropanol, and transferred to a 2 L Wildman trap flask with 40% isopropanol. Filth elements are extracted with light mineral oil. Interlaboratory studies resulted in 92 and 86% average recoveries of rodent hairs and insect fragments, respectively. The proposed method has been adopted as official first action.

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