Citation:
LIU Zhe, GUO Yun-Long, XU Qing-Xuan, LIU Shu-Ying. Study on Analytical Properties of Sunflower Seed Husk as a New Wooden Electrospray Ionization Material[J]. Chinese Journal of Analytical Chemistry,
;2019, 47(9): 1411-1418.
doi:
10.19756/j.issn.0253-3820.181712
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A simple and economical type of electrospray ionization (ESI) technique was developed for loading and ionization of samples by use of disposable wooden tips of sunflower seed husk. Samples could be loaded by simply dipping the tip into sample solutions or normal pipetting onto the natural groove of sunflower seed husk. Instrument parameter settings were optimized to obtain highly sensitive determination of ion intensity of samples, and full MS mode was applied to obtain the mass spectra. The wooden tip of the sunflower seed husk was pointed to the mass spectrometer inlet for Q-Orbitrap mass spectrometer, and the angles were between 60° and 90° in wooden tip. The tip was positioned 2-3 mm away from the inlet of mass spectrometer. The applied voltage to wooden tip of sunflower seed husk was adjusted in the range of 3.5-4.0 kV until optimal ion signals were obtained and all desolvation gases were turned off. The experimental results showed that this new ionization technique was applicable for analysis of various samples, e.g. lignin, ginsenoside, amino acid, proteins, etc. Comparing ESI technique and wooden tip spray coupled toothpick technique, the wooden tip spray with sunflower seed husk (WTSSSH) technique had better efficient in determination of lignin, ginsenoside and proteins by mass spectrometry. Some special sample, e.g. powder, could not be directly analyzed by ESI and wooden tip spray with toothpick, but it was convenient for WTSSSH. In this study, we established a continuous injection device based on the single needle injection method of ESI. The ginseng powder was on-line extracted with the device and the extracts was ionized in wooden tip of sunflower seed husk for mass spectrometric analysis, and a continuous and stable total ion chromatogram and abundant information of mass spectra were obtained.
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