The lipid-accumulating ability of 500 yeast strains isolated in Japan was evaluated. Primary screening
revealed that 31 strains were identified as potential lipid producers, from which 12 strains were cultivated
in a medium containing 3% glucose. It was found that JCM 24511 accumulated the highest lipid
content, up to 61.53%, while JCM 24512 grew the fastest. They were tentatively identified as Cryptococcus
sp. and Cryptococcus musci, respectively. The maximum lipid concentration of 1.49 g/L was achieved by
JCM 24512. Similarly, JCM 24511 also achieved a high lipid production of 1.37 g/L. High lipid productivity
is the most important characteristic of oleaginous yeasts from the viewpoint of practical production.
Among the strains tested here, JCM 24512 had the best lipid productivity, 0.37 g/L/day. The results show
that the isolated yeasts could be promising candidates for biodiesel production.