Application of the Extract of Cocoa Seed (Theobroma Cacao. L) As an New Indicator in Acid-Base Titrations

被引：1

作者：

Costa, Vinicius C. ^{[1
]}

Gramacho, Reinaldo S. ^{[1
]}

Santos, Antonio S. ^{[1
]}

Amorim, Fabio Alan C. ^{[1
]}

机构：

[1] Univ Estadual Santa Cruz, Dept Ciencias Exatas & Tecnol, Rodovia Jorge Amado Km 16, BR-45662900 Ilheus, BA, Brazil

来源：

REVISTA VIRTUAL DE QUIMICA | 2015年 / 7卷 / 04期

关键词：

Natural indicator; Acid/base titration; Anthocyanins; Cocoa;

D O I：

10.5935/1984-6835.20150081

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

In this study we propose the use of a natural indicator obtained from the seeds of plant found abundantly in the southern of Bahia, Brazil, Theobroma cacao L. (cocoa). The extract containing the dyes from cocoa seed was applied as indicator in several acid/base titrations, and the results were compared with values obtained in potentiometric titrations and using phenolphthalein as an indicator of reference. The methodologies involving weak and strong acids were applied with chemistry graduate students of State University of Santa Cruz in Ilheus, Bahia, Brazil.

引用

页码：1496 / 1507

页数：12

共 31 条

[1] Anthocyanins as natural food colours - Selected aspects [J].

Bridle, P ;

Timberlake, CF .

FOOD CHEMISTRY, 1997, 58 (1-2) :103-109

[2] Chemical studies of anthocyanins: A review [J].

Castaneda-Ovando, Araceli ;

de Lourdes Pacheco-Hernandez, Ma ;

Elena Paez-Hernandez, Ma. ;

Rodriguez, Jose A. ;

Andres Galan-Vidal, Carlos .

FOOD CHEMISTRY, 2009, 113 (04) :859-871

[3] Spectrophotometric titrations of acid-base systems using flower extracts containig anthocyanins. [J].

Cortes, Monica Souza ;

Ramos, Luiz Antonio ;

Cavalheiro, Eder Tadeu Gomes .

QUIMICA NOVA, 2007, 30 (04) :1014-1019

[4] Application of flower pigments fn chemical education. [J].

Couto, AB ;

Ramos, LA ;

Cavalheiro, TG .

QUIMICA NOVA, 1998, 21 (02) :221-227

[5]

Cuchinski A. S., 2010, ECLET QUIM, V35, P133

[6]

Damasceno D, APLICACAO EXTRATO AC

[7] "Supermarket Column Chromatography of Leaf Pigments" Revisited: Simple and Ecofriendly Separation of Plant Carotenoids, Chlorophylls, and Flavonoids. from Green and Red Leaves [J].

Dias, Alice M. ;

Ferreira, Maria La Salete .

JOURNAL OF CHEMICAL EDUCATION, 2015, 92 (01) :189-192

[8]

Dias M. V., 2003, QUIMICA NOVA ESCOLA, V17, P27

[9]

Eamon W, 1980, AMBIX, V27, P204

[10] The colours of durum wheat: a review [J].

Ficco, Donatella B. M. ;

Mastrangelo, Anna M. ;

Trono, Daniela ;

Borrelli, Grazia M. ;

De Vita, Pasquale ;

Fares, Clara ;

Beleggia, Romina ;

Platani, Cristiano ;

Papa, Roberto .

CROP & PASTURE SCIENCE, 2014, 65 (01) :1-15

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