MATERIALS AND METHODS
Samples
The two varieties of guava were a Kampuchean cultivar (Vietnam GU8) and a seedless
variety from the wet market. The fruit of the Kampuchean variety is oval and seedy with an
average length of 8–10 cm and width of 7–9 cm. The weight is 300–550 g. The fruit of the
seedless variety is smaller, apple-shaped with length of 5.0–6.6 cm, width of 7.0–8.8 cm and
weight of 145–260 g. The other fruits for comparison are orange (Valencia, a seedless
variety from Australia), banana (Musa sapientum, mas cultivar), dragon fruit (Hylocereus
undatus, grey pulp variety), star fruit (Averrhoa carambola), sugar apple (Annona
squamosa, reddish-brown and green varieties) and water apple (Syzygium aqueum).