title: Rapid detection of copper chlorophyll in vegetable oils based on surface-enhanced Raman spectroscopy.
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.
authors.affiliation: a Institute of Atomic and Molecular Sciences , Academia Sinica , Taipei , Taiwan.
authors.forename: Wei-Nan
authors.initials: WN
authors.lastname: Lian
authors.forename: Jessie
authors.initials: J
authors.lastname: Shiue
authors.forename: Huai-Hsien
authors.initials: HH
authors.lastname: Wang
authors.forename: Wei-Chen
authors.initials: WC
authors.lastname: Hong
authors.forename: Po-Han
authors.initials: PH
authors.lastname: Shih
authors.forename: Chao-Kai
authors.initials: CK
authors.lastname: Hsu
authors.forename: Ching-Yi
authors.initials: CY
authors.lastname: Huang
authors.forename: Cheng-Rong
authors.initials: CR
authors.lastname: Hsing
authors.forename: Ching-Ming
authors.initials: CM
authors.lastname: Wei
authors.forename: Juen-Kai
authors.initials: JK
authors.lastname: Wang
authors.forename: Yuh-Lin
authors.initials: YL
authors.lastname: Wang
mesh_terms: D002735:Chlorophyllides / Q000032:analysis*; D005504:Food Analysis; D005506:Food Contamination / Q000032:analysis; D057230:Limit of Detection; D000069463:Olive Oil / Q000737:chemistry*; D010938:Plant Oils / Q000737:chemistry*; D015203:Reproducibility of Results; D013024:Soybean Oil / Q000737:chemistry*; D013059:Spectrum Analysis, Raman; D000074242:Sunflower Oil
chemical_list: D002735:Chlorophyllides; D000069463:Olive Oil; D010938:Plant Oils; D000074242:Sunflower Oil; D013024:Soybean Oil; C007020:chlorophyllin
keywords: Raman; SERS; copper chlorophyll; olive oil