Determination of low levels of methanol and ethanol in licorice extract by large volume injection head-space GC |
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Authors: | Uematsu Yoko Suzuki Kumi Iida Kenji Hirata Keiko Ueta Tadahiko Kamata Kunihiro |
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Affiliation: | Tokyo Metropolitan Research Laboratory of Public Health: 3-24-1, Hyakunin-cho, Shinjuku-ku, Tokyo 169-0073, Japan. |
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Abstract: | A large volume injection head-space GC method was established for measuring low levels of residual methanol and ethanol in licorice extract used a food additive. A vial was kept at 50 degrees C in the oven of the head-space sampler. Injection of the head-space gas for 0.75 min into a Poraplot Q GC column with a initial oven temperature of 35 degrees C, enabled the determination of low levels (5 micrograms/g) of methanol and ethanol. The standard deviations for five rounds of analysis of methanol and ethanol in licorice extracts were between 0.82 and 2.97. Methanol was found in 6 samples out of 9 collected in 1999, at concentrations exceeding 50 micrograms/g, the limit set by the Japanese Government, established in 1999 and coming into force on April 1, 2000. The highest concentration reached 10,000 micrograms/g. Methanol at a concentration exceeding 50 micrograms/g was found in 2 out of 9 samples collected in 2000. The highest concentration was 270 micrograms/g. |
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