Table 4

		Increase in Vitamin D₂ (per 70 g serving)
Surface	Exposure time (min.)	IU^a			Percent of DRI^b
Aluminum pan	15	754	±	27^A	126
	30	1025	±	21^B	171
Aluminum foil	15	704	±	22^A	117
	30	1142	±	73^B	190
Dark non-stick pan	15	740	±	49^A	123
White paper on glass pan	15	651	±	33^A	108

^aMean ± standard deviation of 2 or 3 replicate analyses. Means that differ significantly (α=0.05) are indicated by different superscripts. 1 IU=5 μg
^bDietary Reference Intake, 600 IU/day [20].

Table 4: Increase in vitamin D₂ in sliced white button mushrooms placed on different surfaces and exposed to sunlight on a clear day (Experiment C, Table 1). Vitamin D₂ in the control (unexposed) mushrooms was 10.5 ± 4.9 IU per 70 g serving, and all increases were statistically significant (p<0.0001).