Characterization of the Processing of Dry Lily (Lilium davidii Duch.) Bulbs by Mid-Infrared Spectroscopy

摘要

Sulfur fumigation and blanching have been commonly used to process dry lily bulbs. However, they have several disadvantages; in particular, the former involves health and environmental risks. This study focuses on identifying the processing methods used in dry lily products by mid-infrared spectroscopy. The peak near 1029 cm(-1) was red-shifted by 3-6 cm(-1), and the intensity of the peak at 1153 cm(-1) increased significantly when the lilies were blanched. Furthermore, differences in the processing methods were observed in second derivative infrared spectra. The small shoulder from 1019.0 to 1016.3 cm(-1) disappeared after blanching, and the peak shapes from 1030 to 980 cm(-1) varied for blanched and unblanched materials. Moreover, the ratio of peak area and peak height at 822 and 667 cm(-1) significantly increased following sulfur fumigation. The results show that infrared spectroscopy allows characterization of the processing of dry lily bulbs.