Acidic, Mineral Oil Extraction of Light Filth from Bread and Donuts

1970 ◽  
Vol 53 (3) ◽  
pp. 562-566
Author(s):  
Joel J Thrasher
Keyword(s):  
Steam Bath ◽  
Mineral Oil ◽  
Oil Extraction ◽  
New Method ◽  
Filter Papers ◽  
Wet Sieving

Abstract Collaborative results are presented on a new method for the extraction of light filth from bread and donuts. The new method consists of product dispersion by steam bath heating or autoclaving, wet sieving on No. 230 sieve, digestion with HC1, followed by extraction of filth with mineral oil from water. Minimum recovery of spike filth elements was 82%. The new method also proved to be faster than method 36.025 and resulted in cleaner filter papers than 36.026. The proposed method is recommended for adoption as official first action.

Collaborative Study of an Acid Autoclave Method for Mineral Oil Extraction of Light Filth from Spaghetti and Macaroni

1969 ◽  
Vol 52 (3) ◽  
pp. 463-465
Author(s):  
Joel J Thrasher
Keyword(s):  
Collaborative Study ◽  
Mineral Oil ◽  
Oil Extraction ◽  
New Method ◽  
Official Method ◽  
Plain Weave ◽  
Filter Papers ◽  
Wet Sieving ◽  
Better Than

Abstract A method for the extraction of light filth from alimentary pastes based on rapid autoclaving of acidified samples, wet sieving on a No. 230 plain weave sieve, and heating the sieve retainings in an acidic mineral oil mixture is described. This new method is faster and results in higher and more reproducible recoveries than method 36.025. Recoveries were equal or better than those achieved by the official method, and the filter papers were cleaner.

Mineral Oil Extraction of Light Filth from Rubbed Sage Collaborative Study

1979 ◽  
Vol 62 (3) ◽  
pp. 597-599
Author(s):  
Emma J Colliflower ◽  
Joel J Thrasher
Keyword(s):  
Plant Material ◽  
Collaborative Study ◽  
Tween 80 ◽  
Mineral Oil ◽  
Oil Extraction ◽  
New Method ◽  
Filter Papers

Abstract The official methods for extracting light filth from rubbed sage, 44.D08–44.D10, specifies a hot isopropanol pretreatment and flotation from cooled dilute isopropanol with mineral oil to extract light filth. The method gives good recoveries, but occasionally excessive interfering plant material is extracted along with the filth elements. A new method has been developed in which chloroform is used for pretreatment instead of isopropanol, and Tween 80-EDTA is added twice rather than once. This method has given consistently cleaner filter papers and better recoveries for rodent hairs, 85 vs. 79%, and for elytral squares, 95 vs. 84%. The new method 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.

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.

Collaborative Study of a New Method for the Extraction of Light Filth from Ground Coffee

1972 ◽  
Vol 55 (1) ◽  
pp. 57-59
Author(s):  
Joel J Thrasher
Keyword(s):  
Hydrogen Peroxide ◽  
Carbon Tetrachloride ◽  
Collaborative Study ◽  
Mineral Oil ◽  
New Method ◽  
Official Method ◽  
Peroxide Bleaching ◽  
Filter Papers ◽  
Analytical Time ◽  
Ground Coffee

Abstract A collaborative study has been completed on a new method for light filth in ground coffee. The sample is defatted with chloroform, dried, and boiled in water; isopropanol is added and the sample is boiled again. Light filth is trapped off with mineral oil from a hot solution. The method yields better recoveries of insect fragments and rodent hairs than the official method. Other advantages are less analytical time, cleaner filter papers, and elimination of the use of carbon tetrachloride. It is recommended that the method be adopted as official first action to replace 40.007(b) for the isolation of light filth from ground coffee and that the hydrogen peroxide bleaching technique described earlier be adopted as a procedure to replace the sodium hypochlorite technique described in 40.006.

Collaborative Study of an Enzymatic Digestion Method for the Isolation of Light Filth from Ground Beef or Hamburger

1976 ◽  
Vol 59 (1) ◽  
pp. 51-52
Author(s):  
Phillip Alioto ◽  
Mary Andreas
Keyword(s):  
Collaborative Study ◽  
Ground Beef ◽  
Enzymatic Digestion ◽  
Mineral Oil ◽  
Digestion Method ◽  
Light Mineral ◽  
Filter Papers ◽  
Wet Sieving

Abstract Collaborative results are presented for a proposed method for light filth extraction from ground beef or hamburger. The method involves enzymatic digestion, wet sieving, and extraction with light mineral oil from 40% isopropanol. Recoveries are good and filter papers are clean. This method has been adopted as official first action.

Collaborative Study of a Method for the Extraction of Light Filth from Canned Fish

1972 ◽  
Vol 55 (1) ◽  
pp. 69-70
Author(s):  
Russell G Dent
Keyword(s):  
Aqueous Phase ◽  
Collaborative Study ◽  
Mineral Oil ◽  
Oil Extraction ◽  
Acid Digestion ◽  
Canned Fish ◽  
Filter Papers

Abstract Collaborative results are presented for a method proposed for light filth extraction from canned fish packed in water, oil, or vegetable sauces. The method utilizes an acid digestion and a hot mineral oil extraction from an aqueous phase in a Corning percolator. Recoveries are reproducible and filter papers are relatively clean. This method is recommended for adoption as official first action to replace procedure 40.064.

Collaborative Study of a New Method for the Extraction of Light Filth from Black and White Ground Pepper

1972 ◽  
Vol 55 (1) ◽  
pp. 83-84
Author(s):  
Russell G Dent ◽  
Paris M Brickey
Keyword(s):  
Collaborative Study ◽  
Mineral Oil ◽  
New Method ◽  
Black And White ◽  
Collaborative Studies ◽  
Filter Papers ◽  
Pepper Sample

Abstract In the method described, the black or white ground pepper sample is slurried with water and wet sieved. The pepper residue is defatted during the sieving step. Flotation extraction of the sieved material utilizes a combination of n-heptane-mineral oil as the oil layer over 40% isopropanol. Collaborative studies resulted in reproducible recoveries and light-to-medium laden filter papers. It is recommended that the method be adopted as official first action to replace 40.109(b).

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