title: An improved approach to identify irradiated spices using electronic nose, FTIR, and EPR spectroscopy.
abstract: Changes in cumin and chili powder from India resulting from electron-beam irradiation were investigated using 3 analytical methods: electronic nose (E-nose), Fourier transform infrared (FTIR) spectroscopy, and electron paramagnetic resonance (EPR) spectroscopy. The spices had been exposed to 6 to 14 kGy doses recommended for microbial decontamination. E-nose measured a clear difference in flavor patterns of the irradiated spices in comparison with the nonirradiated samples. Principal component analysis further showed a dose-dependent variation. FTIR spectra of the samples showed strong absorption bands at 3425, 3007 to 2854, and 1746 cm(-1). However, both nonirradiated and irradiated spice samples had comparable patterns without any noteworthy changes in functional groups. EPR spectroscopy of the irradiated samples showed a radiation-specific triplet signal at g = 2.006 with a hyper-fine coupling constant of 3 mT confirming the results obtained with the E-nose technique. Thus, E-nose was found to be a potential tool to identify irradiated spices.
authors.affiliation: School of Food Science & Biotechnology, Kyungpook Natl. Univ, Daegu, 702-701, Korea; Food Technology Div, Bhabha Atomic Research Center, Trombay, Mumbai, 400 085, India.
authors.forename: Bhaskar
authors.initials: B
authors.lastname: Sanyal
authors.forename: Jae-Jun
authors.initials: JJ
authors.lastname: Ahn
authors.forename: Jeong-Hwan
authors.initials: JH
authors.lastname: Maeng
authors.forename: Hyun-Kyu
authors.initials: HK
authors.lastname: Kyung
authors.forename: Ha-Kyeong
authors.initials: HK
authors.lastname: Lim
authors.forename: Arun
authors.initials: A
authors.lastname: Sharma
authors.forename: Joong-Ho
authors.initials: JH
authors.lastname: Kwon
mesh_terms: D002212:Capsicum / Q000737:chemistry / Q000528:radiation effects; D028527:Cuminum / Q000737:chemistry / Q000528:radiation effects; D004578:Electron Spin Resonance Spectroscopy; D062609:Electronic Nose; D005514:Food Irradiation; D007194:India; D017550:Spectroscopy, Fourier Transform Infrared; D017365:Spices / Q000032:analysis*
keywords: EPR spectroscopy; detection; electronic nose; food irradiation; FTIR