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A new method is presented for determining thecis/trans isomer content of edible vegetable oils. The intensities of Raman lines near 1656 and 1670 cm−1 are associated with thecis andtrans configuration, respectively. A precision of ca. 1% can be obtained in thecis/trans isomer analysis of binary mixtures of methyl esters and triglycerides of monoenes and dienes and of hydrogenated vegetable oils. The spectroscopic data also provide the iodine value of vegetable oils or isolated fractions with precision for a single determination of ca. 1%.

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BAILEY, GLEN F. (Western Regional Research Laboratory, Albany, Calif.), SAIMA KARP, AND L. E. SACKS. Ultraviolet-absorption spectra of dry bacterial spores. J. Bacteriol. 89:984-987. 1965.-The possibility of obtaining reasonably satisfactory ultraviolet-absorption spectra of dry spores embedded in KBr has been demonstrated. Such spectra show the three peaks characteristic of calcium dipicolinate. The dipicolinate spectra are more distinct when reference pellets containing appropriate amounts of the analogous spore coats are employed. These spectra are considered evidence that some type of calcium-dipicolinic acid chelate accounts for at least part of the calcium and dipicolinic acid content of the spore.

from the technical grade monostearin absorb less moisture than do the products made from the purer or molecularly distilled monostearin.Comparison of Permeability of Films of Acetostearin Products and Other Types of Coating Materials. There apparently are no data in the literature on the permeability of fats and fatlike products to moisture, but data are available for many other organic compounds. To provide a basis for comparing acetostearin products and other organic compounds, some of the literature data are reproduced in Table V7. The permeability constants shown were recalculated to conform to the dimensions used in the present investigation.It is evident from Tables III and V that the permeability constant for the acetostearin films is less than that of cellulose acetate and only slightly greater than that of nylon, ethylcellulose, polystyrene, and soft vulcanized rubber.