JTIE 2014, 6(2):48-57 | 10.5507/jtie.2014.017

PIGMENT PROFILE OF OLIVE OILS DETERMINED BY SCHOOL MEASUREMENT SYSTEM LABQUEST AND SPECTROMETER

Jana BRANIŠA, Zita JENISOVÁ, Klaudia JOMOVÁ
Katedra chémie, Fakulta prírodných vied UKF, Trieda Andreja Hlinku 1 949 74 Nitra, SR

Coloration of foods is a significant and important attribute for both producers and consumers, respectively. The following paper present using combination of digital technologies during practical laboratory exercises at secondary school alternatively at university. We decided to work with computer and Vernier LabQuest - standalone interface used to collect sensor data with its build-in graphing and analysis application. The school experiment is focused on introducing the chemistry of everyday life into chemistry education. Pigment spectra were measured by Vernier school measuring system with attached spectrophotometer. Obtained spectra of olive oil samples confirmed that oils contained mainly the following pigments: pheophytin a, pheophytin b, chlorophyll a, chlorophyll b, β-carotene and lutein. The focus was also put on thermal pigment degradation and acidity changes of olive oils commonly present during the food processing. The experiments were designed to enhance the research and academic value of school experiment.

Keywords: LabQuest, spectrometer, olive oil, pigments.

Published: August 1, 2014

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References

  1. ZELENICKÝ, Ľ. - VALOVIČOVÁ, Ľ. - JENISOVÁ, Z. - ŠTUBŇA M. Počítačom podporované experimenty. Nitra: FPV (2011), p.150. ISBN 978-80-8094-906-8
  2. BRESTENSKÁ, B. and NAGY, T. Implementácia IKT do vyučovania chémie na ZŠ a SŠ. Bratislava: ŠPÚ (2001), p. 123. ISBN 80223-1943-0
  3. BARRANCO, D. - FERNÁNDEZESCOLAR, R. - RALLO, L. El Cultivo del Olivo. Junta de Andalucía, Consejería de Agricultura y Pesca and Ediciones Mundiprensa, Madrid, Barcelona, México(1996).
  4. MÍNGUEZ-MOSQUERA, M.I et al. Pigments Present in Virgin Olive Oil. Journal of the American Oil Chemists' Society. 67 (1990) 192-196. Go to original source...
  5. MÍNGUEZ-MOSQUERA, M.I. et al. Color-Pigment Correlation in Virgin Olive Oil. Journal of the American Oil Chemists' Society. 69 (1991) 332-336. Go to original source...
  6. MOYANO, M.J. - HEREDIA, F.J. - MELENDEZ-MARTINEZ, A.J. The Color of Olive Oils: The Pigments and Their Likely Health Benefits and Visual and Instrumental Methods of Analysis. Comprehensive. Reviews in Food Science and Food Safety. Volume 9, Issue 3 (2010) 278-291. Go to original source...
  7. GIUFFRIDA, D. - SALVO, F. - SALVO, A. - PERA, L. - DUGO, G. Pigments composition in monovarietal virgin olive oils from various sicilian olive varieties. Food Chemistry, 101 (2007) 833-837. Go to original source...
  8. GUTIERREZ, G. - QUIJANO, R. - GUTIERREZ-ROSALES, F. Rapid Method to Define and Classify the Color of Virgin Olive Oil, Grasas Aceites 37 (1986) 282-284.
  9. WAN, P.J. - HURLEY, T.W. - GUY, J.D. - BERNER, D.L. Comparison of Visual and Automated Colorimeters-An International Collaborative Study, Journal of the American Oil Chemists' Society.75 (1997) 731-738. Go to original source...
  10. MOYANO, M.J. - HEREDIA, F.J. - MELENDEZ-MARTINEZ, A.J. The Color of Olive Oils: The Pigments and Their Likely Health Benefits and Visual and Instrumental Methods of Analysis. Comprehensive Reviews in Food Science and Food Safety. Volume 9, Issue 3 (2010) 278-291. Go to original source...