By Douglas C. Neckers, David H. Volman, Günther von Bünau
Atmosphere the speed for development and innovation ... ADVANCES IN PHOTOCHEMISTRY. greater than an easy survey of the present literature, Advances in Photochemistry bargains severe reviews written by means of the world over famous specialists. those pioneering scientists provide targeted and sundry issues of view of the present information. Their articles are not easy in addition to provocative and are meant to stimulate dialogue, advertise additional study, and inspire new advancements within the box. during this quantity. Photochemistry in Cyclodextrin Cavities. PIETRO BORTOLUS AND SANDRA MONTI. uneven Photorea. learn more... content material: ADVANCES IN PHOTOCHEMISTRY; CONTENTS; Photochemistry in Cyclodextrin Cavities; uneven Photoreactions of Conjugated Enones and Esters; Photodissociation Dynamics of Hydride Molecules: H Atom Photofragment Translational Spectroscopy; Index; Cumulative Index, Volumes 1-21. summary: surroundings the speed for development and innovation ... ADVANCES IN PHOTOCHEMISTRY. greater than an easy survey of the present literature, Advances in Photochemistry bargains severe reviews written by means of across the world famous specialists. those pioneering scientists provide precise and sundry issues of view of the present info. Their articles are difficult in addition to provocative and are meant to stimulate dialogue, advertise additional study, and inspire new advancements within the box. during this quantity. Photochemistry in Cyclodextrin Cavities. PIETRO BORTOLUS AND SANDRA MONTI. uneven Photorea
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This measures @-carotenetogether with any a-or neo-@-carotenesthat may be present. C. COMMENTS Columns prepared from the first three lots of aluminum oxide tested required 45 ml. of eluant to remove the carotene, while columns prepared from the fourth lot tested required 65 ml. The 28 E. M. BICKOFF alumina must be protected against adsorption of moisture to keep its activity constant. The method can also be used to separate carotene from other pigments in a petroleum ether solution that is free of oil.
ASSAY PROCEDURE Five grams of alfalfa meal is soaked in 20 ml. of iso-octane (2,2,4trimethyl pentane) for 15 minutes in the dark. The meal is removed by coarse filtration and the extract transferred to a chromatographic column 12 mm. diameter x 70 mm. in height, packed with a 1 : 1 mixture of magnesia (Westvaco No. 2642) and filter aid. This step need not be quantitative. The column is washed with 100 ml. isooctane which is discarded. Carotene is eluted with 25 ml. of 1 :9 acetone-iso-octane mixture.
Wide and about 15 cm. tall, constricted a t one end and plugged with a wad of cotton. m. of carotene. Wash with the petroleum ether and determine the carotene in the atrate. If the MgCOa is too retentive of carotene, try another lot. Kieselguhr. Wilkes (87) found that heat-treated diatomaceous earths, which have been widely used as filter aids and diluents in preparing adsorbents for chromatographic purposes, possess in themselves a large number of the desired properties of adsorbents for the chromatographic determination of carotene.
Advances in Photochemistry by Douglas C. Neckers, David H. Volman, Günther von Bünau