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.

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.

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.

Extraction of Light Filth from Fish Paste and Sauce (Bagoong) Not Containing Spice: Collaborative Study

1992 ◽  
Vol 75 (2) ◽  
pp. 263-265
Author(s):  
Larry E Glaze
Keyword(s):  
Collaborative Study ◽  
Mineral Oil ◽  
New Method ◽  
Test Portion ◽  
Plain Weave ◽  
Wet Sieving

Abstract A collaborative study was conducted to validate a new method for the extraction of light filth from fish paste and sauce (Bagoong) not containing spice. A 225 g test portion is digested by boiling in a mixture of acid and emulsifying agents. Light filth is isolated by wet sieving on a No. 230 plain weave sieve with Tergitol, a deaeration boil in 40% isopropanol, and flotation with mineral oil and 40% isopropanol in a Wildman trap flask. Three spiking levels were used in the study for rat hairs and Insect fragments; 1 level was used for whole or equivalent insects. For rat hairs, recoveries at the low, medium, and high levels averaged 77,94, and 76%, respectively. Recoveries of Insect fragments for these levels averaged 92,88, and 93%, respectively; recoveries of whole or equivalent Insects averaged 85,70, and 80%, respectively. The method was adopted first action by AOAC International for the extraction of light filth from fish paste and sauce (Bagoong) not containing spice.

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 a Method for the Extraction of Light Filth from Ground Chicory

1971 ◽  
Vol 54 (3) ◽  
pp. 571-572
Author(s):  
J J Thrasher
Keyword(s):  
Collaborative Study ◽  
New Method ◽  
Official Method ◽  
Average Recovery ◽  
Paraffin Oil ◽  
Filter Papers ◽  
Wet Sieving

Abstract Collaborative results are presented on a new method for light filth in ground chicory. A comparison of the new method and the official method, 40.007(b), indicates that recoveries of spiked larvae and adult insects were approximately equal for the 2 methods. However, average recovery of rodent hairs by the proposed method was 86% while rodent hair recovery by the official method was 55%. The new method utilizes detergent digestion and wet sieving followed by flotation with paraffin oil from 40% isopropanol. It is less time consuming to perform and cleaner filter papers are obtained. The new method has been adopted as official first action.

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.

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.

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 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 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.

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