4.7 Article

Straightforward rapid spectrophotometric quantification of total cyanogenic glycosides in fresh and processed cassava products

期刊

FOOD CHEMISTRY
卷 158, 期 -, 页码 20-27

出版社

ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2014.02.066

关键词

Cassava; Fresh roots; Processed cassava; Cyanogenic glycosides; Aquacyanocobyrinic acid; Cyanide; Cassava latex; Linamarase; Food analysis

资金

  1. Swedish International Development Agency (SIDA/SAREC), Sweden
  2. Eduardo Mondlane University, Mozambique

向作者/读者索取更多资源

In this study, we extend pioneering studies and demonstrate straightforward applicability of the corrin-based chemosensor, aquacyanocobyrinic acid (ACCA), for the instantaneous detection and rapid quantification of endogenous cyanide in fresh and processed cassava roots. Hydrolytically liberated endogenous cyanide from cyanogenic glycosides (CNp) reacts with ACCA to form dicyanocobyrinic acid (DCCA), accompanied by a change of colour from orange to violet. The method was successfully tested on various cassava samples containing between 6 and 200 mg equiv. HCN/kg as verified with isonicotinate/1,3-dimethylbarbiturate as an independent method. The affinity of ACCA sensor to cyanide is high, coordination occurs fast and the colorimetric response can therefore be instantaneously monitored with spectrophotometric methods. Direct applications of the sensor without need of extensive and laborious extraction processes are demonstrated in water-extracted samples, in acid-extracted samples, and directly on juice drops. ACCA showed high precision with a standard deviation (STDV) between 0.03 and 0.06 and high accuracy (93-96%). Overall, the ACCA procedure is straightforward, safe and easily performed. In a proof-of-concept study, rapid screening of ten samples within 20 min has been tested. (C) 2014 Elsevier Ltd. All rights reserved.

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