Table 2 Singlet oxygen quenching activity of the intermediate carotenoids

15-cis-4,4′-Diapophytoene (1)

> 100

4,4′-Diaponeurosporene (2)

45

5-Hydroxy-5,6-dihydro-4,4′-diaponeurosporene (3)

56

5-Hydroxy-5,6-dihydro-4,4′-diapolycopene (4)

30^a

5-Glucosyl-5,6-dihydro-4,4′-diapolycopene (5)

30

Methyl 5-glucosyl-5,6-dihydro-4,4′-diapolycopenoate

5.1^a

Astaxanthin

3.7^a