title: [Study on the determination of tung oil adulterated in vegetable oils by first derivative spectrophotometry].
abstract: A method of first derivative spectrophotometry for qualitative and quantitative analysis of tung oil adulterated in vegetable oils, including peanut oil, bean oil, rape seed oil, tea seed oil, palm oil and mixed vegetable oil, was established. The spectrum of tung oil features three valleys at 291.3, 278.3 and 266.4nm, and three peaks at 284.1, 271.5 and 260.7nm. At 291.3nm, the coefficient (deltaE(1%)1cm/deltalambda) was -1.03 x 10(3). When the concentration of tung oil adulterated in vegetable oils was downed to 0.1%, the above specialities still remain and the changes in wavelengths were not more than 0.7nm. The detection limit of the concentration of tung oil adulterated in vegetable oils was lower than 0.1%.
authors.affiliation: Guangdong Provincial Institute for Drug Control, 510180 Guangzhou.
authors.forename: B
authors.initials: B
authors.lastname: Zhu
authors.forename: J
authors.initials: J
authors.lastname: Mo
authors.forename: R
authors.initials: R
authors.lastname: Huang
mesh_terms: D005504:Food Analysis / Q000379:methods*; D005506:Food Contamination / Q000032:analysis*; D057230:Limit of Detection; D010938:Plant Oils / Q000032:analysis / Q000737:chemistry*; D015203:Reproducibility of Results; D013053:Spectrophotometry / Q000379:methods*
chemical_list: D010938:Plant Oils; C009612:tung oil