Method of mass-analyzing body fluid and apparatus therefor

A mass-analyzing apparatus for a living body fluid, comprising:

• a first flow passage for flowing a sample solution containing a sample to be analyzed,
• a second flow passage for supplying an organic solution for moving with said sample to be analyzed flowing on said first flow passage,
• a third flow passage for introducing said solutions from said first flow passage and said second flow passage into an ion source, a ground electrode provided on said second flow passage and proximate to said third flow passage, said ion source spraying said sample solution from a tip of said third flow passage and thereby ionizing it,
• a gas supply passage provided around third flow passage, and
• an analyzing unit for analyzing ions from said ion source.

A living body fluid analyzing system comprising:

• a microdialysis for sending a first solution having an osmotic pressure which is substantially similar to an osmotic pressure of a body fluid into a living body and extracting a second solution from said living body;
• a first flow passage in which said second solution from said microdialysis flows;
• a second flow passage which mixes said second solution with an organic solution;
• a gas source;
• a gas flow controller which controls a flow quantity of the gas from said gas source;
• a third flow passage in which the gas introduced from said gas source flows;
• an ion source having an orifice for spraying and ionizing said second solution from said second flow passage at an end of said third flow passage;
• and
• a mass spectrometer for carrying out mass analysis of ions sprayed from said orifice.