By American Chemical Society
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Possibly in recognition of the insignificance of this delayed action, Joslyn (16) introduced a time limit of 2 minutes for the observation. Another variation which attempts to place the test upon a semiquantitative basis involves carrying out the reaction in a Smith fermentation tube. This enables one to obtain a rough idea of the volume of gas formed, but it can be misleading unless a time limit is imposed and the skins are removed. Quantitative tests for catalase activity find their greatest usefulness in examination of finished product.
44 ADVANCES IN CHEMISTRY SERIES of the same carrots, unlyophilized but ground to pass a 40-mesh sieve. The lyophilization procedure is, therefore, equivalent to grinding to afinenesswhich usually cannot be practicably attained with the unlyophilized substances. ch005 Recent Attempts to Develop Accurate Moisture Methods Re drying Procedure. Makower, Chastain, and Nielsen (18) described a method called the "redrying procedure" for the determination of the drying conditions to be used in the measurement of the moisture content of dehydrated vegetables by the vacuumoven method.
Ch005 38 ADVANCES IN CHEMISTRY SERIES tables) as for dehydrated ones (10% moisture or less), where a small absolute error in measurement represents an appreciable fraction of the total water. In a search for an accurate method of measuring moisture in foods, one cannot overlook the essential requirements of convenience, speed, and precision. Many currently used methods meet these requirements without necessarily yielding accurate results under the conditions used. Probably most important are the electrical methods (18, 24, 25, 35), the air- and vacuum-oven methods (1, 2, 6, 18, 25, 28, 85), distillation with organic solvents (1, 8, 7, 12, 13, 25, 35), and the Karl Fischer reagent method (9, 11, 25, 31, 82).