Method of Evaluating Metal Cleaners

Abstract

Emmerie-Engel Mg. per gram Alfalfa leaf meal 0,23 0.26 Beet leaf meal 0.44 0.71 Broccoli leaf meal 0.39 0.42 Kale leaf meal 0.36 0.39 Lima bean leaf meal 0.72 0.70 Rhubarb leaf meal 1.24 1,20 Spinach leaf meal 0.42 0.40 Turnip leaf meal 0.34 0.30 Mash, 5% alfalfa 0.02 Mash, 2.5% broccoli 0.02 Scratch corn 0.00 Fresh carrot root 0' 14fi 0.13' Fresh carrot top 0.79" 0.56' Frozen spinach 0.47" 0.43' a Calculated on moisture-free basis.than the Emmerie-Engel value. Hickman et al. ( 6) report an analysis of a mixture of foods in which the Furter-Meyer value was 1400% higher than the Emmerie-Engel result. These extreme discrepancies are undoubtedly due to insufficient purification of the extracts prior to color measurement. The Emmerie-Engel procedure is much more sensitive than the Furter-Meyer, and hence is more convenient for low potency samples. SUMMARYThe Furter-Meyer and Emmerie-Engel methods for determination of tocopherol have been applied to plant extracts. In both cases, dry plant materials are extracted with Skellysolve B, and fresh materials with an ethanol-petroleum ether solution, the alcohol then being removed. It is necessary to purify the sample before the final estimation can be made. Chlorophyll and xanthophyll are separated from tocopherols by adsorption on a Supercel-activated magnesia column. Carotene and tocopherolquinones are then destroyed by treatment with 85% sulfuric acid.

Cleanability and Oil-Spreading Rates

“…Cleaning index (C.I.) is defined by Spring (18) as the percentage of the sample area appearing clean. The value of for three samples tested together at any given set of conditions is plotted against the cleaning index in Figure 1. Sigma ( ) represents the standard deviation of a number of observations.…”