Tetrahydroanthracene glucosides in callus tissue from Aloe barbadensis leaves

Callus tissue of Aloe barbadensis grown in the dark produced two new tetrahydroanthracene glucosides, 3,4-dihydro-2,4,8,9-tetrahydroxy-6-methyl-1(2H)-anthracenone-4- O - β -d-glucopyranoside and 3,4-dihydro-2-methoxy-4,8,9-trihydroxy-6-methyl-1(2H)-anthracenone-4- O - β -d-glucopyranoside. The effect of light on the formation of tetrahydroanthracene glucosides in the calli is discussed.