
Contents
32.2.09
AOAC Official Method 945.39
Loss on Drying (Moisture) in Soybean Flour
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Published:January 2023
Cite
Loss on Drying (Moisture) in Soybean Flour', in Dr. George W Latimer, Jr. (ed.), Official Methods of Analysis of AOAC INTERNATIONAL, 22nd Edition (
Extract
First Action 1945
Final Action
Moisture
Proceed as in 925.10 (see 32.1.03), except use 5 g test portion and dry 2 h.
Ash; Crude Fiber
See 942.05 (see 4.1.10); 962.09E (see 4.6.01).
Nitrogen
See 920.87 (see 32.1.22).
Petroleum Ether Extract or Oil
Reagent
Petroleum ether.—Initial boiling temperature, 35–38°C; dry-flask end point, 52–60°C; ≥95% distilling ≤54°C, and ≤60% distilling ≤40°C; specific gravity at 60°F (15.6°C), 0.630–0.660; evaporation residue ≤0.002% by weight.
Determination
Accurately weigh duplicate test portions of 2 g full-fat or 5 g low-fat soy flour and wrap each portion in 150 mm filter paper (No. 597 Schleicher and Schuell or equivalent); rewrap in second paper or papers so as to prevent escape of test portion, leaving top of second paper open like thimble. Place piece of absorbent cotton in top of thimble to distribute the dropping ether. Place 25 mL petroleum ether in 125 mL tared flask, and extract test portion 5 h in Butt-type or similar extractor. (Ether should drop on center of thimble at rate of ≥150 drops/min, and volume solvent should be kept ca constant.) Evaporate solvent until no trace remains, cool residue to room temperature, and weigh. As last traces of ether are sometimes difficult to detect by odor, heat ≥1 h to constant weight.
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