Table 3.

Isomerization of β-carotene during extraction procedure

	Percentage of (β-carotene isomers %a
	Direct				After extraction
Sample	All-trans	9-cis	13-cis	15-cis	All-trans	9-cis	13-cis	15-cis
Almost pure all-trans-β-carotene	97.2	0.7	2.2	–	97.4	0.8	1.9	–
Heat-isomerization (β-carotene	73.0	1.1	23.4	2.5	72.6	1.6	24.0	1.8

^aTotal β-carotene = 100%.