Journal
FOOD ADDITIVES AND CONTAMINANTS PART A-CHEMISTRY ANALYSIS CONTROL EXPOSURE & RISK ASSESSMENT
Volume 24, Issue 11, Pages 1299-1305Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/02652030701452108
Keywords
screening; sultanas; origin; ochratoxin A (OTA); FTIR-ATR spectroscopy
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A method of screening sultanas for ochratoxin A (OTA) contamination, using mid-infrared spectroscopy/Golden Gate single- reflection ATR (attenuated total reflection), is described. The main spectral characteristics of sultanas from different sources were identified in a preliminary acquisition and spectral analysis study. Principal component analysis (PCA) showed that samples of various origins had different spectral characteristics, especially in water content and the fingerprint region. A lack of reproducibility was observed in the spectra acquired on different days. However, spectral repeatability was greatly improved when water activity of the sample was set at 0.62. A calibration curve of OTA was constructed in the range 10-40 mu g OTA kg(-1). Samples with OTA levels higher than 20 mu g kg(-1) were separated from samples contaminated with a lower concentration (10 mu g OTA kg(-1)) and from uncontaminated samples. The reported methodology is a reliable and simple technique for screening dried vine fruit for OTA.
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