Rapid detection of copper chlorophyll in vegetable oils based on surface-enhanced Raman spectroscopy
Journal
Food Additives and Contaminants - Part A Chemistry, Analysis, Control, Exposure and Risk Assessment
Journal Volume
32
Journal Issue
5
Pages
627-634
Date Issued
2015
Author(s)
Lian, W.-N.
Shiue, J.
Wang, H.-H.
Hong, W.-C.
Shih, P.-H.
Hsu, C.-K.
Huang, C.-Y.
Hsing, C.-R.
Wei, C.-M.
Wang, Y.-L.
Abstract
The addition of copper chlorophyll and its derivatives (Cu-Chl) to vegetable oils to disguise them as more expensive oils, such as virgin olive oils, would not only create public confusion, but also disturb the olive oil market. Given that existing detection methods of Ch-Chl in oils, such as LC-MS are costly and time consuming, it is imperative to develop economical and fast analytical techniques to provide information quickly. This paper demonstrates a rapid analytical method based on surface-enhanced Raman spectroscopy (SERS) to detect Cu-Chl in vegetable oils; the spectroscopic markers of Cu-Chl are presented and a detection limit of 5 mg kg(-1) is demonstrated. The analysis of a series of commercial vegetable oils is undertaken with this method and the results verified by a government agency. This study shows that a SERS-based assessment method holds high potential for quickly pinpointing the addition of minute amounts of Cu-Chl in vegetable oils.
Publisher
Taylor and Francis Ltd.
Type
journal article