Feigl-Anger test

HCN-sensitive Feigl-Anger test paper Colony assay [41]... 

There is much variation from plant to plant with regard to content of cyanogenic compounds and the p-glycosidases necessary to hydrolyze them. In a number of taxa, only 1-3% of the individuals give positive cyanide tests done by the Feigl-Anger method. In ottiers, virtually all individuals are cyanogenic (Aikman et al., 1996). 

Both picrate and Feigl-Anger paper may give positive tests when 3-nitropropionic acid and related compounds are present (Seigler et al., 1989). 

For qualitative (presence-absence) or semiquantitative determinations of cyanide, the easiest and most reliable method is a simple test with either Feigl-Anger or sodium picrate paper. The reactions on which these tests are based as well as other methods for detection of cyanogenic glycosides are described by Hegnauer (1986). 

Feigl, R, Anger, V. Spot Tests in Organic Analysis, 7th Ed., p. 153-154, Elsevier, Amsterdam, London, New York, 1%6. 

Feigl, F and Anger, V. "Spot Tests in Organic Analysis", Elsevier, Amsterdam, 1966. 

F.Feigl and V.Anger, Spot Tests in Inorganic Analysis, Elsevier, Amsterdam, 1972. 

Feigl, F. and V. Anger, Replacement of benzidine by copper ethy-acetoacetate and tetra base as spot-test reagent for hydrogen cyanide and cyanogen, Analyst, 91, 282-284 (1966). 

Feigl F, Anger V (1972) Spot tests in inorganic analysis, 6th edn. Elsevier, Amsterdam... 

Feigl, E Anger, V. andOesper, R. E. 1972. Spot Tests inInorganicAnalysis. Elsevier, London. Pp. 285 6. 

Katyal, M. and Singh, H.B., Analytical Applications of Hydroxycoumarins, Talanta, 1968,15,1043. Feigl, F. and Anger, V., Spot Tests in Inorganic Analysis, 6th Edn., Elsevier, Amsterdam, 1972. Holzbecher, Z., Divis, L., Krai, M., Siicha, L. and... 

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