Fig. 5From: Quantitative analysis of vitamin D using m/MALDI-TOF mass spectrometry based on a parylene matrix chipQuantitative analysis of vitamin D using the parylene matrix chip. a Mass spectrum of 25(OH)D3 in ethanol. b Standard curve of 25(OH)D3 in ethanol. c Mass spectrum of 25(OH)D3 in serum. d Standard curve of 25(OH)D3 in serumBack to article page