Eight vegetables were pre-treated with and without sa­ ponification, and chromatographed by reversed-phase HPLC. Carote11Oid peaks were identified using seven reference standards. Samples extracts were also chromatographed llsing a mixed magnesia and diatomaceous earth column. Fractions were eluted using stepwise increases in the proportion of acetone in hexane, studied by UV-VIS ab­ sorption s...

Vitamin A intake was assessed from dietary histories on 452 men with prostate cancer and 899 population controls in Hawaii during the period 1977-1983. In the group of men less than 70 years of age, there were no significant associations of this nutrient with risk for prostate cancer. In the men greater than or equal to 70 years, however, risk increased directly with the amount of vitamin A con...

Polyenes, which are represented by carotenes, carotenoids and conjugated polyenals, are some of the most important targets for astrobiology, because they can provide strong evidence of the presence of organic compounds in the most extreme environments, such as on Mars. Raman spectroscopy has been used as the main analytical tool in the identification of such compounds, for the greatest variety ...

Mevalonic (3,5-dihydroxy-3-methylvaleric) acid, first recognized as a precursor of cholesterol by Tavormina et al. (1) and Tavormina and Gibbs (Z), also serves as an effective precursor of the acyclic isoprenoids squalene (3-5) and rubber (6). In both of these cases, 2-C14-labeled mevalonic acid is incorporated into the isoprenoids without randomization of the labels. The present work concerns ...

Research on Heavy Hydrogen at Princeton: DR. Scientific Apparatus and Laboratory Methods: HUGH S. TAYLOR . . .......... .........303 A RBle for the Interpretation of Melting Point Diagrams: PROFESSOR ROY F. NEWTON. An InA Monumental Reference Work on Geography: PROexpensive Efficient Relay: PETER T. BLACK .................. 321 pESSOR DOUGLAS JOHNSON ... .. 305 Special Articles: Scientific Even...

Collections of gram positive bacteria from coastal sand dune vegetation, Ipomoea pes-caprae showed a predominance of orange pigmented colonies of Microbacterium arborescens-AGSB. The pigment was identified using a combination of UV/visible spectral data and HPLC retention time as a lycopene type carotenoid pigment with λmax at 468 nms. These bacteria may be accumulating carotenoids as part of t...

0308-8146/$ see front matter 2010 Elsevier Ltd. A doi:10.1016/j.foodchem.2010.08.042 ⇑ Corresponding author. Tel.: +60 7 5535609; fax: + E-mail address: [email protected] (Z.A. Manan) Sub-critical extraction of palm oil from palm mesocarp using R134a solvent was conducted via the dynamic mode to investigate the ability of R134a to extract b-carotene. The yield of palm oil and the solubility of...

The ever increasing importance of physical methods in the elucidation of the structure and configuration of carotenoids is reviewed. The use of solvent partition, chromatography, X-ray crystallography, infra-red spectroscopy and optical rotary dispersion are briefly discussed. Special emphasis is given to the application of absorption spectroscopy and to 220 MHz proton magnetic resonance spectr...