Table 2. β-Carotene Amounts, Bioaccessibility of β-Carotene, and the Recovery of β-Carotene with the Two Diets in TIM-1 over 6 h^a.

	β-carotene in mixed diet			β-carotene in oil diet
	run 1	run 2	run 3	run 1	run 2
feeding
diet (μg)	498	498	498	220	220
capsule (μg)	47	47	47	47	47
endogenous (μg)	nd	nd	nd	nd	nd
filtrates
jejunal filtrate (μg)	95.6	83.5	80.3	76.3	80.5
ileal filtrate (μg)	73.7	73.0	55.5	65.4	62.8
ileal efflux (μg)	264.2	312.0	233.6	34.8	44.9
residues
residue of stomach and duodenum (μg)	31.7	27.4	67.9	44.0	62.9
residue of jejunum and ileum (μg)	48.2	69.7	40.1	25.8	29.7
bioaccessibility (μg β-carotene/100 μg β-carotene)b	31.1	28.7	24.9	53.1	53.7
recovery (%)c	94.2	103.8	87.6	92.3	105.2

^aThe mixed diet contained vegetables high in β-carotene, and the oil diet contained vegetables low in β-carotene supplemented with synthetic β-carotene in salad dressing oil. nd = not detected.

^bThe β-carotene bioaccessibility is the amount bioaccessible β-carotene in μg per 100 μg of β-carotene available for digestion and is calculated as (μg β-carotene in filtrates)/(μg β-carotene from feeding + endogenous) × 100.

^cRecovery (%) = (β-carotene in filtrates + ileal efflux + residues)/(β-carotene from feeding + endogenous) × 100.