Relationship of peroxide value and thiobarbituric acid value to development of undesirable flavor characteristics in fats

The peroxide value and thiobarbituric acid value were compared with the flavor score for a series of different types of fats, with and without added monoglyceride and with and without different stabilizers. The data indicated that the flavor score cannot be estimated for any given fat from either the peroxide value or the thiobarbituric acid value. Either can be used to follow the development of off flavors in a given product or formulation but the relative level may vary from product to product. Presented at the AOCS Meeting in Minneapolis, 1963.     

Comparison of methods for the determination of glycerol by acetylation

Summary A method for the determination of glycerol has been presented in which the acetylation is performed with a reagent consisting of acetic anhydride in pyridine. Typical data obtained by this procedure and other accepted methods are shown. The proposed procedure is simpler, more rapid, and more accurate than the conventional acetin method.     

Determination of monoglyceride in fats and oils by oxidation with periodic acid

Summary A method based upon oxidation of monoglyceride by periodic acid has been developed for the determination of monoglyceride in fats and oils. The reaction and conditions that influence the determination have been described and discussed. This paper was presented at the Chicago meeting of the American Oil Chemists’ Society, October 25–27, 1944.     

Material properties of historical masonry of the Frauenkirche and the masonry guideline for reconstruction

This contribution provides insight into the characteristics of the masonry of the historical Frauenkirche and the requirements for its reconstruction. Comprehensive material studies were performed in the course of preparation for and implementation of the project, and guidelines for evaluation, design and construction were established on the basis of those studies. The material used for the reconstruction is sandstone, coming from quarries in the immediate vicinity, as well as mortar composed on a lime basis with hydraulic additives. The execution is monitored within the scope of a quality management system specially created for the reconstruction project. This system simultaneously provides a detailed documentation of the building materials used in the project.     

Management Influences on Stream-Flow Variability in the Past and Under Potential Climate Change in a Central European Mining Region

Water Resources Management - Robust assessments of stream-flow volume and variability under current and potential future conditions are essential for sustainable water resources planning and...     

Beitrag zum Einfluß der dendritischen Erstarrung von 19 Cr-9 Ni-Nb-Bandplattierungsschweißgut auf das Korrosionsverhalten

Contribution to the Influence of the Dendritic Solidification of 19 Cr 9 NiNb Submerged-Arc-Welding-Strip-Cladding on Corrosion Behavior SAW-strip-claddings out of 19%Cr9%Ni + Cb tempered at 650 °C were tested in 8%-sulphuric acid at room temperature. A mechanical pulsating load was superimposed to corrosion. Only a slight corrosion attack could be found on the surface after 50 000 cycles, i.e. 18 days test duration. The metallographic investigation showed selective attack of the ferritic grains, modified by the post weld heat treatment. The specific dendritic solidification form of the SAW-cladding had no detrimental influence under the chosen conditions.     

Solubility of calcium soaps of gum rosin,rosin acids and fatty acids

Summary The solubility of calcium soaps of rosin acids and fatty acids have been determined and compared. The solubility of calcium soaps of rosin acids (d-pimaric, dihydroabietic, and l-abietic acids) present in gum rosin was found to be greater than that of the calcium soaps of the following saturated fatty acids: lauric, myristic, palmitic, and stearic acids. The calcium oleate was much more soluble than the calcium stearate. As the amount of hydrogen in the rosin acid molecule is increased, l-abietic to dihydroabietic to tetrahydroabietic acid, the solubility of the calcium soap is decreased. The author wishes to express his indebtedness to Dr. G. S. Jamieson and W. G. Rose of the Agricultural Chemical Research Division for the pure lauric, myristic, palmitic and stearic acid used in this study.     

The germicidal activity of rosin soap and fatty acid-rosin soap as indicated by hand-washing experiments

Summary and Conclusions Price’s procedure as slightly modified (4) was used for studying the germicidal action of cleaning agents on the hands and showed that rosin soap and a commercial soap containing rosin were more active germicidally on the bacteria normally found on human skin than the usual commercial fatty acid soaps free from rosin soap. The experiments indicate that the lather of a 10-percent coconut oil soap solution and of a 10-percent coconut oil-rosin soap solution are germicidally active against the organisms removed. However, three 2-minute washes with these soap solutions had little effect on the bacteria not removed from the hands. The use of a 10-percent rosin soap solution in the same manner had a marked germicidal effect against both the organisms removed and those remaining. The lather of a commercial soap containing rosin soap was shown to be germicidally active, but three 2-minute washes had only a slight effect on the resident flora. However, the regular use of this soap daily for one week led to substantial reduction of both the transient and resident flora of the hands. The evidence of germicidal activity of rosin soaps and soaps containing rosin, both with regard to these hand-washing experiments and the “in vitro” (7) experiments, indicates that wider consideration might well be given this type of soap where germicidal activity is of importance. L. S. Stuart was employed in the Industrial-Farm Products Research Division when this work was done.