PROBLEM TO BE SOLVED: To form a sample/matrix mixture having the uniformity and the high ionization durability on a sample plate.;SOLUTION: A CHCA_B as a liquid matrix and a sample liquid containing a material to be analyzed are dropped, and mixed on the sample plate 10. A droplet integration liquid contains a methanol or an acetonitrile, and is dropped on it. The sample/matrix mixture divided into a plurality of small droplets on the sample plate 10 can be integrated into one droplet. The material to be analyzed can be in a uniform state macroscopically. The high ionization durability can be achieved by using the liquid matrix as a matrix in comparison with a conventional method using a solid matrix. As a result from the above, the sufficient analysis accuracy can be achieved by a laser irradiation at several points only. An analysis time can be greatly reduced in a MALDI-MS.;COPYRIGHT: (C)2011,JPO&INPIT
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