The Malaysian Journal of Analytical Sciences Vol 17 No 1 (2013): 71 – 74

 

 

 

ISOLATION AND UTILIZATION OF CORN COBS HEMISELLULOSE AS CHELATING AGENT FOR LEAD IONS

 

(Pemencilan dan Penggunaan Hemiselulos Daripada Tongkol Jagung Sebagai Agen Pengkelat Untuk Ion Plumbum)

 

Muchlisyam^1*, Urip Harahap¹, Jansen Silalahi¹,  Zul Alfian²

 

¹Facultyof Pharmacy,

²Department of Chemistry, Faculty of Mathematics and Natural Sciences

University of  Sumatra Utara,Medan, Indonesia

 

*Corresponding author: muchlisyam@gmail.com

 

 

Abstract

Corn cobs is an agricultural byproduct containing polysaccharide composed of cellulose, hemicellulose  and lignin. Hemicellulose has a hydroxyl and carbonyl functional groups   which can be used  as chelating agent for metal ions. The purpose of this study was to isolate and evaluate corncobs hemicellulose as a chelating agent toward lead ion. Graphite furnace spectrofotometry at 283.3  nm was used to determine the residual lead ion in solution.  The research’s result showed that the highest yield of hemicellulose (12.04%) was obtained from delignication with  0,03M NaOH in 60% ethanol and 3% H₂O_2, hemicellulose isolation with 500 ml of 0.2 M NaOH, and precipitation with 1 : 4 ratio of 10% acetic acid in 95% ethanol.  The 300 mg corn cobs hemicellulose has chelating effect for 40mg lead solution at (39.52 ± 0.1350) mg or  98.80%, that the corn cobs hemicellulose can be used as a chelating agent for lead.

 

Keywords: corn cobs, isolation, hemicellulose, Pb, chelating agent

 

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