World Journal of Chemical Education
ISSN (Print): 2375-1665 ISSN (Online): 2375-1657 Website: http://www.sciepub.com/journal/wjce Editor-in-chief: Prof. V. Jagannadham
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World Journal of Chemical Education. 2019, 7(2), 136-144
DOI: 10.12691/wjce-7-2-13
Open AccessSpecial Issue

Spectroscopic Studies of Food Colorings

Patrick Gräb1, and Ekkehard Geidel1

1Didactics of Chemistry, Julius-Maximilians-University Würzburg, 97074 Würzburg, Germany

Pub. Date: April 11, 2019

Cite this paper:
Patrick Gräb and Ekkehard Geidel. Spectroscopic Studies of Food Colorings. World Journal of Chemical Education. 2019; 7(2):136-144. doi: 10.12691/wjce-7-2-13

Abstract

In chemical education, it is often a challenge to understand the basic principles of spectroscopic techniques due to missing connections to the real world. Therefore, the present contribution offers context-based applications of UV/Vis spectroscopy for analytics of food colorings with which learners can improve their skills regarding this method. The spectroscopic determination of food colorings seems to be a promising approach due to the long tradition and omnipresence of dyes in supermarket products. The therefor-required spectral data for commonly used dyes are provided for educational usage. Qualitative and quantitative analytics of food colorings in four different lemonades and chocolate beans have been used to introduce learners to important analytical techniques like sample preparation or elimination of confounding factors. These analytics also display the limitations of the method in the visible range of light in the case of tartrazine and curcumin. By applying Lambert-Beer-Bouguer’s Law in different variations, typical calculations of concentrations can be studied in quantitative analyses. The studied food samples demonstrate the different usage of food colorings depending on the country of sale. Finally, a 3D-printable low-cost photometer suitable for the discussed quantitative analytics in educational contexts is presented.

Keywords:
UV/Vis spectroscopy quantitative analysis food colorings context-based teaching low-cost photometer

Creative CommonsThis work is licensed under a Creative Commons Attribution 4.0 International License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

References:

[1]  Schairer, P., Wagner, S., and Geidel, E., “An Experimental Introduction to Basic Principles of the Interaction of Electromagnetic Radiation with Matter,” World Journal of Chemical Education, 6(1), 29-35, Jan. 2018.
 
[2]  Karge, H. G. and Geidel, E., “Vibrational Spectroscopy,” in Molecular Sieves - Science and Technology, Berlin, Springer Verlag, 2004, 1-200.
 
[3]  Checchetti, A., “Quantitative Analysis of Alcoholic Drinks. Use of Calibration Curve Method to Determine the Alcoholic Degree of Samples of Paesanella, a Distillate of the Family of Grappa,” World Journal of Chemical Education, 3(3), 70-73, May 2015.
 
[4]  Schmidt, W., Optical Spectroscopy in Chemistry and Life Sciences, Weinheim, Wiley-VCH, 2005.
 
[5]  Otto, M., Analytische Chemie, 4th ed., Weinheim, Wiley-VCH, 2011.
 
[6]  Bolte, C., Streller, S., and Hofstein, A., “How to motivate students and raise their interest in chemistry education,” in Teaching Chemistry - A Studybook, Rotterdam, Sense Publishers, 2013, 67-95.
 
[7]  Weirauch, K., Lohwasser, K., Fenner, C., and Geidel, E., “Chemie im Kontext weitergedacht - ein Diskussionsbeitrag,” in Naturwissenschaftliche Bildung als Grundlage für berufliche und gesellschaftliche Teilhabe, Kiel, 2019, 193-196.
 
[8]  van Vorst, H., Fechner, S., and Sumfleth, E., “Unterscheidung von Kontexten für den Chemieunterricht,” Zeitschrift für Didaktik der Naturwissenschaften, 24(1), 167–181, Dec. 2018.
 
[9]  Huntemann, H., Paschmann, A., Parchmann, I., and Ralle, B., “Chemie im Kontext-ein neues Konzept für den Chemieunterricht?,” CHEMKON, 6(4), 191–196, Jan. 1999.
 
[10]  Grasse, E. K., Torcasio, M. H., and Smith, A. W., “Teaching UV–Vis Spectroscopy with a 3D-Printable Smartphone Spectrophotometer,” Journal of Chemical Education, 93(1), 146-151, Jan. 2016.
 
[11]  Stich, E., “Food Color and Coloring Food: Quality, Differentiation and Regulatory Requirements in the European Union and the United States,” in Handbook on Natural Pigments in Food and Beverages, R. Carle and R. M. Schweiggert, Eds. Woodhead Publishing, 2016, 3-27.
 
[12]  Burrows, A., “Palette of Our Palates: A Brief History of Food Coloring and Its Regulation,” Comprehensive Reviews in Food Science and Food Safety, 8(4), 394-408, Oct. 2009.
 
[13]  Hisano, A., “The Rise of Synthetic Colors in the American Food Industry, 1870-1940,” Business History Review, 90(3), 483-504, 2016.
 
[14]  Levitan, C. A., Zampini, M., Li, R., and Spence, C., “Assessing the Role of Color Cues and People’s Beliefs About Color–Flavor Associations on the Discrimination of the Flavor of Sugar-Coated Chocolates,” Chemical Senses, 33(5), 415-423, Jun. 2008.
 
[15]  Wrolstad, R. E. and Culver, C. A., “Alternatives to Those Artificial FD&C Food Colorants,” Annual Review of Food Science and Technology, 3(1), 59-77, 2012.
 
[16]  McCann, D. et al., “Food additives and hyperactive behaviour in 3-year-old and 8/9-year-old children in the community: a randomised, double-blinded, placebo-controlled trial,” The Lancet, 370(9598), 1560-1567, Nov. 2007.
 
[17]  McAvoy, S. A., “Global Regulations of Food Colors,” The Manufacturing Confectioner, 94(9), 77-86, Sep. 2014.
 
[18]  Ebermann, R. and Elmadfa, I., Lehrbuch Lebensmittelchemie und Ernährung, 2nd ed., Wien, Springer-Verlag, 2011.
 
[19]  Gräb, P., “Spectral Data of Food Colorings,” 2019. [Online]. Available: https://www.chemie.uni-wuerzburg.de/didaktik/lehrer/experimente-zur-spektroskopie/. [Accessed: 14-Jan-2019].
 
[20]  Haanpalo, J. and Hauta-Kasari, M., “Candy colors.” [Online]. Available: https://www.uef.fi/web/spectral/candy-colors. [Accessed: 12-Dec-2018].
 
[21]  Nedovic, V., Kalusevic, A., Manojlovic, V., Levic, S., and Bugarski, B., “An overview of encapsulation technologies for food applications,” Procedia Food Science, 1, 1806-1815, Jan. 2011.
 
[22]  Sarndi, I. and Stetina, V., “Anwendung des Klärungsreagens nach Carrez bei der polarimetrischen Bestimmung der Stärke,” Zeitschrift für Lebensmittel-Untersuchung und Forschung, 106(2), 142-144, Aug. 1957.
 
[23]  Wicklin, R., “The distribution of colors for plain M&M candies,” 20-Feb-2017. [Online]. Available: https://blogs.sas.com/content/iml/2017/02/20/proportion-of-colors-mandms.html. [Accessed: 04-Dec-2018].
 
[24]  Lehmann, G. and Eich, H., Anleitung zur Abtrennung und Identifizierung von Farbstoffen in gefärbten Lebensmitteln, Bonn, Harald Boldt Verlag, 1980.
 
[25]  Kiefer, W., Peica, N., Pavel, I., Rastogi, V. K., and Cinta Pinzaru, S., “Vibrational characterization of E102 food additive by Raman and surface-enhanced Raman spectroscopy and theoretical studies,” Journal of Raman Spectroscopy, 36, 657-666, Feb. 2005.
 
[26]  Kolev, T. M., Velcheva, E. A., Stamboliyska, B. A., and Spiteller, M., “DFT and Experimental Studies of the Structure and Vibrational Spectra of Curcumin,” International Journal of Quantum Chemistry, 102, 1069-1079, Jan. 2005.
 
[27]  Kvittingen, E. V., Kvittingen, L., Sjursnes, B. J., and Verley, R., “Simple and Inexpensive UV-Photometer Using LEDs as Both Light Source and Detector,” Journal of Chemical Education, 93(10), 1814-1817, Oct. 2016.
 
[28]  Tymecki, Ł., Pokrzywnicka, M., and Koncki, R., “Paired emitter detector diode (PEDD)-based photometry – an alternative approach,” Analyst, 133(11), 1501-1504, Oct. 2008.