title: Organosulfide profile and hydrogen sulfide-releasing capacity of stinky bean (Parkia speciosa) oil: Effects of pH and extraction methods.
abstract: Stinky beans (Parkia speciosa) were hydrodistilled and solvent-extracted and the oil obtained was analyzed by GC-MS/FID. Nine cyclic and one acyclic organosulfides were identified comprising 36% of total volatiles. Solvent extracts contained significantly (p < 0.05) higher total organosulfides (680 ppm) as compared to distilled oil (444 ppm). The concentrations of organosulfides are highly dependent on the pH values of the matrix, with control sample (pH 5.40) giving the highest total organosulfides (424 ppm) followed by that of pH 7.0 (234 ppm), pH 9.0 (195 ppm), and pH 3.0 (152 ppm). The H2S-releasing capacity, expressed as diallyl trisulfide equivalents (DATS-E in mmol DATS/g), corresponded well with the differences in organosulfide concentrations as affected by pH with control having the highest value (24.35) followed pH 7.0 (7.27), pH 9.0 (3.27), and pH 3.0 (1.80). We conclude that stinky bean oil is a potent H2S-releasing agent that could have health-beneficial properties.
authors.affiliation: Food Science and Technology Programme, Department of Chemistry, National University of Singapore, 117543 Singapore, Singapore.
authors.forename: Restituto
authors.initials: R
authors.lastname: Tocmo
authors.affiliation: Food Science and Technology Programme, Department of Chemistry, National University of Singapore, 117543 Singapore, Singapore.
authors.forename: Dong
authors.initials: D
authors.lastname: Liang
authors.affiliation: Food Science and Technology Programme, Department of Chemistry, National University of Singapore, 117543 Singapore, Singapore.
authors.forename: Chenhui
authors.initials: C
authors.lastname: Wang
authors.affiliation: Food Science and Technology Programme, Department of Chemistry, National University of Singapore, 117543 Singapore, Singapore.
authors.forename: Jerlin
authors.initials: J
authors.lastname: Poh
authors.affiliation: Food Science and Technology Programme, Department of Chemistry, National University of Singapore, 117543 Singapore, Singapore; National University of Singapore (Suzhou) Research Institute, 377 Lin Quan Street, Suzhou Industrial Park, Jiangsu 215123, China. Electronic address: chmhdj@nus.edu.sg.
authors.forename: Dejian
authors.initials: D
authors.lastname: Huang
mesh_terms: D004220:Disulfides / Q000494:pharmacology*; D007887:Fabaceae / Q000737:chemistry*; D006862:Hydrogen Sulfide / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D010938:Plant Oils / Q000737:chemistry*
chemical_list: D004220:Disulfides; D010938:Plant Oils; D006862:Hydrogen Sulfide
keywords: Hydrogen sulfide; Organosulfides; Parkia speciosa; Stinky bean oil