4.9. Antioxidant Activity. Fruits and vegetables are known
to contain various forms of phytochemicals and antioxidants,
particularly polyphenol compounds (e.g., flavonoids
and anthocyanins). Their frequent consumption has been
associated with a lowered risk of heart disease, cancer,
hypertension, and stroke. RZZ, which is a widely used herb
taken before meals especially in Fiji, is reported to be the
richest source of kaempferol (240 mg/100 g) when compared
to another species of Zingiberaceae (Z. officinale) [37]. Z.
officinale contained only trace amount of kaempferol. Other
than kaempferol, RZZ contained