Carbon disulfide formation in papaya under conditions of dithiocarbamate residue analysis. (1st December 2015)

• Record Type: Journal Article
• Authors: Abakerli, R.B.; Sparrapan, R.; Sawaya, A.C.H.F.; Eberlin, M.N.; Jara, J.L.P.; Rodrigues, N.R.; Fay, E.F.; Luiz, A.J.B.; Galvão, T.D.L.; Martins, D. dos S.; Yamanishi, O.K.; Toledo, H.H.B.
• Is Part Of: Food chemistry. Volume 188(2015)
• Page Start: 71
• Page End: 76
• Publication Date: 2015-12-01
• Subjects: Dithiocarbamate residue analysis -- Papaya -- Carbon disulfide -- Benzylisothiocyanate; Food -- Analysis -- Periodicals; Food -- Composition -- Periodicals; 664
• DOI: 10.1016/j.foodchem.2015.04.059
• Languages: English
• ISSNs: 0308-8146

Abstract

Highlights: Fungicides are applied for the prevention and control of fungal disease in papaya. Three common analytical methods were used to measure CS2 levels. Endogenous CS2 levels were compared to those from dithiocarbamate residues in fruit. Different methods result in varied CS2 concentrations due to method particularities. Abstract: Golden, Sunrise Solo and Tainung cultivars of papaya were found to release CS2 when submitted to experimental conditions of dithiocarbamate residue analysis. Three common analytical methods were used to quantitate CS2 ; one spectrophotometric method and two chromatographic methods. All three methods gave positive CS2 results for all three papaya varieties. Other endogenous compounds present in isooctane extracts of papaya fractions detected via gas chromatography (GC/ITD) using electron ionization (EI) were: carbonyl sulfide, dimethyl sulfide, carbon disulfide, 2-methylthiophene, 3-methylthiophene, 2-ethylthiophene, 3-ethylthiophene, benzylisothiocyanate, benzylthiocyanate and benzonitrile. Control samples were obtained from papaya plantations cultivated in experimental areas, in which no treatment with fungicides of the dithiocarbamate group was applied. Endogenous CS2 levels were compared with true dithiocarbamate residues measured in papaya samples from the field trials following applications of the mancozeb fungicide. Three days after application, true dithiocarbamate residues, measured by the procedure with isooctane partitioning and GC–ITD, were at the average level of 2 mg kg −1 .