New PDF release: Carotenoids Part A: Chemistry, Separation, Quantitation, and

By Lester Packer (Eds.)

ISBN-10: 0121821145

ISBN-13: 9780121821142

This quantity and its spouse, quantity 214 of Methods in Enzymology, current a finished, state of the art compilation of the molecular and mobile method wanted for pursuing study with carotenoids

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Extra resources for Carotenoids Part A: Chemistry, Separation, Quantitation, and Antioxidation

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Allrightsofreproductionin anyformreserved. [5] CAROTENOIDS LABELED WITH RADIOISOTOPES 43 cations. In general, carotenoids that have been specifically labeled at one or more particular positions have been prepared with stable isotope variants, while carotenoids labeled with a radioactive isotope have usually been prepared from a labeled precursor by biosynthesis. Notable exceptions are certain carotenoids labeled with tritium. Partial reduction of an alkyne precursor of these carotenoids with tritium gas produces these labeled materials.

Department of Energy by Iowa State University under Contract No. W-7405-Eng-82. S. Department of Energy under Contract No. DE-AC02-83CH-10093. [5] S y n t h e s i s o f C a r o t e n o i d s S p e c i f i c a l l y L a b e l e d w i t h Isotopic Carbon and Tritium By ARNOLD A. LIEBMAN, WALTER BURGER, SATISH C. CHOUDHRY, and JOSEPH CUPANO Introduction The chemistry used in the synthesis of carotenoids is quite extensive and has been periodically reviewed, l This literature reflects the expanding use of chiral reagents and other tools of modern organic synthesis and also the increasing use of isotopically labeled carotenoids in a variety of applit K.

L "HOV3 v -v (18) 21 CO2Me ~BDMSO" -- " (17) i ~''~ peridinin (1) (3) L 1l'E-isomer SCHEME II. Palladium-catalyzed olefination leading to the C15-epoxyformyl ester (18), a key intermediate to peridinin (1). catalyzed olefination ~° of the vinyl triflate (16) is used. This reaction gives a high yield and illustrates a new approach to polyene-chain formation. 59 M in hexane) at - 7 8 ° under N 2 and the mixture is stirred for 30 min at - 7 8 °. 00 g) prepared from 4-hydroxy-2,2,6-trimethylcyclohexanone 1~ and TBDMSC1, in dry T H F (75 ml).

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Carotenoids Part A: Chemistry, Separation, Quantitation, and Antioxidation by Lester Packer (Eds.)


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