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 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 Coconut: Collaborative Study

1978 ◽  
Vol 61 (4) ◽  
pp. 898-899
Author(s):  
Joel J Thrasher
Keyword(s):  
Aqueous Phase ◽  
Sodium Lauryl Sulfate ◽  
Collaborative Study ◽  
Mineral Oil ◽  
Official Method ◽  
Lauryl Sulfate ◽  
Plant Debris ◽  
Filter Papers

Abstract The official method for filth in coconut, 44.029, frequently produces filter papers with excessive plant debris and low hair recoveries. To overcome these deficiencies, 3 changes in the method were made: (1) the defatting step was modified to use sodium lauryl sulfate in combination with borax for better defatting; (2) 40% isopropanol was substituted for 60% ethanol as the aqueous phase for cleaner papers; and (3) mineral oil was substituted for n-heptane to improve hair recoveries. These changes resulted in higher, more reproducible recoveries of rodent hairs and insect fragments and cleaner filter papers. The method has been adopted as official first action to replace 44.029.

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.

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 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).

Oil Flotation Extraction of Light Filth from Ground Capsicums Excluding Paprika: Collaborative Study

1978 ◽  
Vol 61 (4) ◽  
pp. 900-902
Author(s):  
Joel J Thrasher ◽  
Emma Jean Colliflower
Keyword(s):  
Collaborative Study ◽  
Fold Increase ◽  
Mineral Oil ◽  
Improved Method ◽  
Coefficients Of Variation ◽  
Filter Papers ◽  
Collaborative Tests ◽  
Wet Sieving

Abstract A collaborative study has been completed on an improved method for the isolation of light filth from ground capsicums other than paprika. The proposed method involves isopropanol pretreatment, wet-sieving, and extraction from cooled 6 0% ethanol with a mineral oil-heptane mixture. The collaborative tests by the proposed method showed an approximate 2-fold increase in recoveries of insect fragments and rodent hairs with acceptable coefficients of variation and clean filter papers. The proposed method has been adopted as official first action to replace 44.123.

Collaborative Study of the Extraction of Light Filth from Whole Wheat-Based Ready-to-Eat Breakfast Cereals

1971 ◽  
Vol 54 (3) ◽  
pp. 573-574
Author(s):  
Russell G Dent ◽  
Paris M Brickey
Keyword(s):  
Sodium Oleate ◽  
Collaborative Study ◽  
Acid Digestion ◽  
Breakfast Cereals ◽  
Whole Wheat ◽  
Paraffin Oil ◽  
Filter Papers ◽  
Wet Sieving ◽  
Propanol Solution

Abstract A method has been developed for the extraction of light filth from wheat-based ready-to-eat breakfast cereals. The method utilizes acid digestion followed by wet sieving and washing with isopropanol, then trapping with a heptane-paraffin oil mixture from a sodium oleate-40% iso propanol solution. A collaborative study resulted in 75% average recoveries of spike elytral squares and rodent hairs from wheat-based cereals. The method, as developed for oat-based cereals, resulted in debris-laden filter papers and therefore was judged ineffective. The method has been adopted as official first action for wheat-based cereals. Further studies are recommended for oat-based cereals.

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