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Summary

A quantitative method using silica gel 60 HPTLC plates, automated bandwise sample application, petroleum ether-dichloromethane 9:1 as mobile phase, and automated slit-scanning densitometry has been developed for the analysis of lycopene in nutritional supplements consumed to reduce the risk of prostate cancer and other forms of cancer and cardiovascular disease. Four products containing 300 μg, 3 mg, 5 mg, or 10 mg lycopene plus other ingredients were analyzed using a ChromaDex lycopene standard. The amount of lycopene in the tested samples ranged from 77.7 to 98.1% relative to the stated label values. Accuracy was validated by spiked blank analysis, and precision by performing replicate analysis. Accuracy was found to be within 1.90% of theoretical values for the 3 mg softgels and 1.10% of theoretical values for the 10 mg softgels, and precision was 1.44% relative standard deviation (RSD) for the 10 mg softgels and 2.39% RSD for the spiked blank for the 3 mg softgels. Lycopene standards available from two other companies were analyzed and found to contain 55.6, 57.6, and 20.0% of the minimum amount expected from the stated label values.

Open access

Thermal diesel-like analysis

Quality control by thermal and chemometric analysis

Journal of Thermal Analysis and Calorimetry
Authors:
Alexandre G. S. Prado
,
Rômulo D. A. Andrade
,
Jez W. B. Braga
, and
Paulo A. Z. Suarez

, Halim , Y , Francis , D , Rodriguez-Saona , LE . 2009 . Rapid and simultaneous determination of lycopene and beta-carotene contents in tomato juice by infrared spectroscopy . J Agric Food Chem . 57 : 1105 – 1112 10.1021/jf802920z

Restricted access
Progress in Agricultural Engineering Sciences
Authors:
Dzsenifer Németh
,
Gábor Balázs
,
Zsanett Bodor
,
John-Lewis Zinia Zaukuu
,
Zoltán Kovács
, and
Noémi Kappel

than the self-rooted ones, also their lycopene content was higher. The vintage effect can significantly influence the organoleptic parameters of melons ( Bett-Garber et al., 2003 ). Conclusion Grafting of cucurbits is very popular today. Grafted

Open access

Introduction Tomato fruits ( Lycopersicon esculentum Mill.) are one of the most important vegetable crops in the world, which contains vital elements such as antioxidants as lycopene [ 1 ]. Egypt produces over 6.7 million tons of tomatoes, ranking

Open access