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Studying the extent of agreement between the photoacoustic and optothermal methods for assessing the amount of lycopene in foods derived from processed tomatoes (CROSBI ID 513284)

Prilog sa skupa u zborniku | sažetak izlaganja sa skupa | domaća recenzija

Bicanic, Dane ; van der Veeken, Pascal ; van Rooij, Hans ; Dóka, Otto ; Luterotti, Svjetlana Studying the extent of agreement between the photoacoustic and optothermal methods for assessing the amount of lycopene in foods derived from processed tomatoes // 2nd central European Meeting - 5th Croatian Congress of Food Technologists, Biotechnologists and Nutritionists, Opatija, 17-20. listopad 2004. Book of Abstracts / Karlović, Damir (ur.). Zagreb: Hrvatsko društvo za prehrambenu tenologiju, biotehnologiju i nutricionizam, 2005. str. 24-24

Podaci o odgovornosti

Bicanic, Dane ; van der Veeken, Pascal ; van Rooij, Hans ; Dóka, Otto ; Luterotti, Svjetlana

engleski

Studying the extent of agreement between the photoacoustic and optothermal methods for assessing the amount of lycopene in foods derived from processed tomatoes

The consumption of lycopene, major substance in tomato was frequently demonstrated to have beneficial health effects. Methods most commonly used to determine lycopene include various forms of chromatography and spectrophotometry. The main problem encountered in the analysis of lycopene is the need for a time consuming preparation of the sample as well high as considerable instability of this compound (in terms of exposure to heat and light, interaction with chemicals etc.). Recently, two novel laser based photothermal (PT) techniques, i.e. the optothermal window (OW) and photoacoustic spectroscopy (PAS) for determination of lycopene have been proposed. Both approaches enable direct (no sample preparation whatsoever) assessment of lycopene but the availability of a previously obtained calibration curve is a necessity. In this study OW and PAS were used to rapidly assess lycopene in a variety of commercial products (tomato juice, ketchup, pastas and purees) derived from processed tomatoes. Absolute concentrations of lycopene in these products were determined by HPLC and spectrophotometry. The OW and PAS measurements were performed with the argon laser (20 mW at 502 nm) at modulation frequency of 25 Hz. The performances of two PT methods are compared in the terms of their sensitivity, precision, reproducibility and limit of detection.

lycopene; detection; processed tomato; photothermal methods

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Podaci o prilogu

24-24.

2005.

objavljeno

Podaci o matičnoj publikaciji

2nd central European Meeting - 5th Croatian Congress of Food Technologists, Biotechnologists and Nutritionists, Opatija, 17-20. listopad 2004. Book of Abstracts

Karlović, Damir

Zagreb: Hrvatsko društvo za prehrambenu tenologiju, biotehnologiju i nutricionizam

953-99725-0-7

Podaci o skupu

Nepoznat skup

pozvano predavanje

29.02.1904-29.02.2096

Povezanost rada

Fizika, Kemija, Prehrambena tehnologija