Table 1.

Alpha-diketones in headspace of flavoring bulk samples.

	Flavor A		Flavor B		Flavor C		Flavor D
Chemical	ppb	μg/mL bulk	ppb	μg/mL bulk	ppb	μg/mL bulk	ppb	μg/mL bulk
Diacetyl	1.97 × 104	1.3	2.62 × 103	0.18	5.90 × 104	4.0	1.05 × 104	0.70
2,3-Pentanedione	1.04 × 106	83	—	—	5.29 × 105	42	5.06 × 105	41
2,3-Hexanedione	8.2 × 104	7.5	—	—	4.25 × 104	3.9	5.55 × 104	5.1

ppb = parts per billion; μg/mL = microgram per milliliter of bulk sample; “—”= not detected.