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Spectrophotometric Determination of Total Sulfite in White Wine Samples Using Crude Extracts from Flowers

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Márlon Herbert Flora Barbosa Soares , Luiz Antonio Ramos and Éder Tadeu Gomes Cavalheiro

Departamento de Química, Universidade Federal de São Carlos, São Carlos/SP, Brazil

J. Chem. Educ., 2002, 79 (9), p 1111

DOI: 10.1021/ed079p1111

Publication Date (Web): September 1, 2002

Section:

History, Education, and Documentation

Abstract

A didactic spectrophotometric method for determining the sulfite content in white wine samples is proposed. It is based upon a discoloring reaction between flower anthocyanins and the sulfite in basic media. Students' results obtained from iodometric data agreed well with results obtained by the proposed procedure. The use of natural dyes attracted students' interest, enhancing the learning process.

Keywords (Audience):

Second-Year Undergraduate

Keywords (Domain):

Analytical Chemistry

Keywords (Pedagogy):

Hands-On Learning / Manipulatives

Keywords (Subject):

Dyes / Pigments

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This article has been cited by 2 ACS Journal articles (2 most recent appear below).

Research Advances: Improving Our Understanding of Health Benefits and Dangers Associated with Nature’s Chemical Cupboard
Angela G. King
Journal of Chemical Education2011 88 (3), 251-253
- Research Advances: Improving Our Understanding of Health Benefits and Dangers Associated with Nature’s Chemical Cupboard
  Angela G. King
  Journal of Chemical Education2011 88 (3), 251-253
  This installment of Research Advances describes some benefits and caveats associated with using natural products as an aid to good health. Nature yields a bountiful supply of compounds that can boost or derail our health, and as researchers study the ...
  Abstract | Full Text HTML | Hi-Res PDF | PDF w/ Links
Determination of Hypochlorite in Bleaching Products with Flower Extracts To Demonstrate the Principles of Flow Injection Analysis
Luiz Antônio Ramos , Kátia Roberta Prieto , Éder Tadeu Gomes Cavalheiro and Carla Cristina Schmitt Cavalheiro
Journal of Chemical Education2005 82 (12), 1815
- Determination of Hypochlorite in Bleaching Products with Flower Extracts To Demonstrate the Principles of Flow Injection Analysis
  Luiz Antônio Ramos , Kátia Roberta Prieto , Éder Tadeu Gomes Cavalheiro and Carla Cristina Schmitt Cavalheiro
  Journal of Chemical Education2005 82 (12), 1815
  The use of crude flower extracts is proposed to teach the principles of flow injection procedures. In this experiment a bleaching reaction between hypochlorite and the anthocyanins contained in the flower extracts is examined. The bleaching of the crude ...
  Abstract | Hi-Res PDF | PDF w/ Links