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STAKEHOLDER PANEL ON Dietary
Supplements
Background & Fitness for Purpose
Vitamin D
John Austad
d
AOAC 2015 Mi ‐Year Meeting
Rockville, MD
19 March 2014
Background on analyte
•
Vitamin D
–
Two Primary Forms:
•
Ergocalciferol (Vitamin D
2
)
–
Formed from UV‐Light Irradiated Ergosterol
–
C
28
H
44
O Molecular Mass = 396.55 g/mol
Ch l
l if l (Vit i D )
•
o eca c ero am n
3
–
Formed from UV‐Light Irradiated 7‐dehydrocholesterol
–
C
27
H
44
O Molecular Mass = 384.64 g/mol