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. Author manuscript; available in PMC: 2019 Oct 1.
Published in final edited form as: Anal Bioanal Chem. 2018 Jul 31;410(26):6881–6889. doi: 10.1007/s00216-018-1288-z

Table 1.

Detection and quantification limit of MALDI-MS2 method- Successive 5-fold dilutions of 12.5 ng/μL Des mixed with 25 ng/μL of Labeled-Des in serum and urine were evaluated to assess the detection and quantification limit of MALDI-MS2 method.

Serum Urine
Desmosine
(ng/μL)		 Observed (ng/ μL) % error Observed (ng/ μL) % error
12.5 12.50 ± 0.32 0.0 12.50 ± 0.10 0.0
2.50 2.46 ± 0.04 −1.5 2.46 ± 0.02 −1.4
0.50 0.500 ± 0.015 0.0 0.478 ± 0.007 −4.4
0.10 0.104 ± 0.004 4.0 0.094 ± 0.001 −6.0
0.020 0.0206 ± 0.0003 3.0 0.0186 ± 0.0009 −7.0
0.0040 0.0045 ± 0.0004 12.5 0.0048 ± 0.0002 20