Our data support data of Speek, Speek-Saichua, and Schreurs (1988) who observed that the total carotenoid concentration in an unknown Thai durian cultivar was 3.8 lg per gram FW and that of b-carotene 1.9 lg per gram FW, i.e., 50% of total carotenoids. This is very similar to what we now found in ripe cv. Monthong fruit. Khoo et al. (2008) investigated total carotenoids and b-carotene in durian cv. Nyekak from Indonesia. The data in two samples, expressed in mg per 100 g dry weight, were about 11 and 15 for total carotenoids and 7.6 and 11 for b-carotene, respectively. Thus b-carotene represented about 70% of the total carotenoids. As the pulp water content of ripe fruit is about 65% w/w (Ketsa, unpublished data), the b-carotene concentrations, when expressed per unit FW, were about 27 and 37 lg per gram FW,
respectively. This is similar to our data in pulp of ripe cv. Chanee fruit.