GSC  Vol.2 No.3 , August 2012
Investigation of a Simple and Cheap Source of a Natural Indicator for Acid-Base Titration: Effects of System Conditions on Natural Indicators
ABSTRACT
This study investigated a natural indicator for acid-base titration which is extracted from guinea corn leaves popularly called “waakye leaves” in Ghana. Four types of acid-base titration were studied: strong acid versus (v/s) strong base, strong acid versus weak base, weak acid versus strong base, and weak acid versus weak base. The indicator color change, pH range and the average titre values were determined for each type of acid-base titration. These values were comparable to those obtained from three standard indicators: methyl orange, methyl red and phenolphthalein. Total flavonoids (TF) and condensed tannin (CT) from the crude leaves extract were determined which might be the major reasons for the activity of the extract as an indicator for simple acid-base titration. The authors suggest that the natural indicator is cheap, available, simple to extract, user and environmentally friendly and could be an excellent replacement for standard indicators.

Cite this paper
D. Abugri, O. Apea and G. Pritchett, "Investigation of a Simple and Cheap Source of a Natural Indicator for Acid-Base Titration: Effects of System Conditions on Natural Indicators," Green and Sustainable Chemistry, Vol. 2 No. 3, 2012, pp. 117-122. doi: 10.4236/gsc.2012.23017.
References
[1]   F. O. Nwosu, F. A. Adekola and K. C. Ihedioha, “Simple Titrimetric Colour Indicators from Some Natural Flower Petals,” Centrepoint (Science Edition), Vol. 12, No. 1, 2004, pp. 74-89.

[2]   K .S. Pathade, S. B. Patil, M. S. Konda-war, N. S. Naikwade and C. S. Magdum, “ Morus Alba Fruit-Herbal Alternative to Synthetic Acid Base Indicators,” International Journal of ChemTech Research, Vol. 1, No. 3, 2009, pp. 549-551.

[3]   S. B. Patil, M. S. Kondawar, D. S. Ghod-ke, N. S. Naikwade and C. S. Magdum, “ Use of Flower Extracts as an Indicator in Acid-Base Titrations,” Research Journal of. Pharmacy and Technology, Vol. 2, No. 2, 2009, pp. 421- 422.

[4]   I. S. Udachan, A. K. Sahoo and G. M. Hend, “ Extraction and Characterization of Sorghum (Sorghum bicolor L. Moench) Starch,” International Food Research Journal, Vol. 19, No. 1, 2012, pp. 15-319.

[5]   D. A. Abugri, B. J. Tiimob, V. A. Apal-angya, G. Pritchett and W. H. McElhenney, “Bioactive and Nutritive Compounds in Sorghum Bicolor (Guinea Corn) Red Leaves and Their Health Implication,” Journal of Food Chemistry, 2012.

[6]   N. Turkmen, F. Sari and Y. S. Velioglu, “Effects of Extraction Solvents on Concentration and Antioxidant Activity of Black and Black Mate Tea Polyphenols Determined by Ferrous Tartrate and Folin-Ciocalteu Methods,” Food Chemistry, Vol. 99, No. 4, 2006, pp. 835-841. doi:10.1016/j.foodchem.2005.08.034.

[7]   B. J. Xu and S. K. C. Chang, “A Comparative Study on Phenolic Profiles and Antiox-Idant Activities of Legimes as Affected by Extraction Solvents,” Journal of Food Science, Vol. 72, No. 2, 2007, pp. S159-S166. doi:10.1111/j.1750-3841.2006.00260.xPMid:17995858

[8]   H. S. Yim, F. Y. Chye, S. K. Ho and C. W. Ho, “Phenolic Profiles of Selected Edible Wild Mushrooms are Affected by Extraction Solvent, Time and Temperature,” Asia Journal of Food Argo-Industry, Vol. 2, No. 3, 2009, pp. 392- 401.

[9]   M. L. Price, S. Vanscoyoc and L. G. Butler, “A Critical Evaluation of the Vanillin Reaction as an Assay for Tannin in Sorghum Grain,” Journal of Agriculture and Food Chemistry, Vol. 26, No. 5, 1978, pp. 1214-1218. doi:10.1021/jf60219a031.

[10]   U. D. Chavan, F. Shahidi and M. Naczk, “Extraction of Condensed Tannins from Beach Pea (Lathyrus maritimus L.) as Affected by Different Solvents,” Food Chemistry, Vol. 75, No. 4, 2001, pp. 509-512. doi:10.1016/S0308-8146(01)00234-5.

[11]   D. S. Skoog, D. M. West and F. J. Holler, “Analytical Chemistry: An Introduction,” 6th Edition, Saunders College Publishing, Philadelphia, 1994.

[12]   V. C. Bhagat, R. D. Patil, P. R. Channekar, S. C. Shetty and A. S. Akarte, “ Herbal Indicators as a Substituent to Synthetic Indicators,” International Journal of Green Pharmacy, Vol. 2, No. 3, 2008, pp. 162-163. doi:10.4103/0973-8258.42735

[13]   L. G. Hargis, “Analytical Chemistry: Principles and Techniques,” Prentice Hall International Editions, Upper Saddle River, 1988.

[14]   S. Singh, S. B. Bothara, S. Singh, R. Patel and R. Ughreja, “Preliminary Pharmaceutical Characterization of Some Flowers as Natural Indicators,” The Pharma Research, Vol. 5, No. 2, 2011, pp. 213-220.

 
 
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