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IJSTR >> Volume 1 - Issue 8, September 2012 Edition

International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616

Conversion of Sorrel (Hibiscus Sabdariffa) Calyces To Glucose

[Full Text]



O. A. Ajayi, Olawale, A.S., S. S. Adefila



Keyword: zoborodo, acid hydrolysis, Sorrel calyx, cellulose, bioethanol, glucose



Abstract:- The utilization of agrowaste for the production of bioethanol has attracted worldwide attention as a strategy for reducing global warming and improving global energy security. Sorrel drink, popularly known as "zoborodo" in Nigeria is a non-alcoholic drink, which is obtained from the calyces of Hibiscus sabdariffa, by solid-liquid extraction process, leaving the calyces pulp as the raffinate. The calyces obtained after extraction being rich in carbohydrate, is used in this work as raw material for glucose production. The rate of glucose production and its concentration using hydrochloric acid was found to increase with increase in temperature, acid concentration and reaction contact time and reduction in calyces' particle sizes. The conversion after 120 minutes was found to be 25% at 600C with 6% w/v acid strength. The results suggest that acid strength greater than 6%w/v would be more effective from 600C and above. The finding also shows a shift in the influence of mass transfer control to reaction control mechanism, with increase in temperature. It is established that under favorable condition sorrel calyces could serve as alternative source of energy and raw material for food and pharmaceutical industries.



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