Journal
JOURNAL OF CHROMATOGRAPHY A
Volume 1259, Issue -, Pages 179-186Publisher
ELSEVIER
DOI: 10.1016/j.chroma.2012.03.058
Keywords
Anisatin; Mass spectrometry; DART; Star anise; Biotoxin; Food analysis
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After ingestion, products containing Chinese star anise (Illicium verum)contaminated or adulterated with Japanese star anise (Illicium anisatum) or other Illicium species. can cause epilepsy, hallucinations, and nausea due to the rare neurotoxic sesquiterpene dilactone anisatin that is present in Japanese star anise. Thus a rapid, simple and unambiguous method for distinguishing between the morphologically similar Chinese star anise and toxic Japanese star anise is important for food safety issues. Direct Analysis in Real Time (DART) ambient ionisation coupled with orbitrap high resolution mass spectrometry allowed the recording of mass spectra of anisatin in solid star anise fruits in seconds without any prior sample pretreatment. Spectra could be obtained in both positive ([M+NH4](+) at m/z 346.1496, C15H24NO8) and negative mode ([M-H](-) at m/z 327.1074, C15H19O8) and gave the same outcome provided a mass resolution of at least 27,000 is available. The anisatin signal was typically >1000 times larger in Japanese star anise than in Chinese star anise thus allowing an unequivocal qualitative determination. Herbal teas containing star anise fragments too small to be visually recognised, could be analysed by preparing a tea in 6 min and subsequently sampling similar to 2 mu L of tea on a glass rod. None of the 8 investigated retail teas contained significant quantities of anisatin. Spiking a complex herbal tea containing Chinese star anise with an equally concentrated tea prepared from Japanese star anise provided a linear calibration curve (R-2 >= 0.995) after normalising on a native constituent of Chinese star anise (standard addition method). This showed that adulteration down to 1% (w/w) is still measurable. Compared with existing PCR, TLC, GC-MS and HPLC-ESI-MS/MS procedures, the proposed DART-HRMS procedure is faster and simpler and moreover measures the actual biotoxin. (C) 2012 Elsevier B.V. All rights reserved.
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