Effects of Low Temperature and Increased Oxygen Concentration on Color of Intact Pre-rigor Muscle

The effects of low temperature and increased oxygen concentration on color of intact pre-rigor muscle were determined by use of the Hunter color difference meter. Normally dark,intact,pre-rigor muscle turned bright red when held at low temperature and high oxygen concentration.The effect was reversible in that the muscle again turned dark when returned to air at room temperature. The bright red color observed in pre-rigor muscle at low temperature and in oxygen was due to lower mitochondrial oxygen consumption at low temperature, which allowed myoglobin to become oxygenated at high oxygen concentration.     

The rapid determination of moisture

The principles underlying the evaporation of moisture from oil bearing materials are discussed with especial reference to rapid testing. Two forms of rapid moisture testing apparatus employing relatively high temperatures and strong induced draft, are described. Data are given to show how the results compare with determinations made in a conventional oven at the usual drying temperature, as well as a tabulation comparing the results obtained by an untrained plant operator using the rapid tester with checks on the same samples made in the laboratory. The advantages inherent in rapid moisture testing from the control standpoint are discussed. Finally, the application of the apparatus as a controlled-heat hotplate is suggested.