[Contents of barbaloin-related compounds in aloe drinks and their change during storage].
The contents of barbaloin (BA), isoBA, aloin-dimers A, B, C, D and aloe-emodin (AE) in aloe drinks were investigated. BA and isoBA were detected in 30 of the 31 samples at the levels of 120-570 micrograms/mL and 120-580 micrograms/mL, respectively. Aloin-dimers A, B, C and D were detected in 8 of the 31 samples at the levels of 12-38 micrograms/mL, 13-39 micrograms/mL, 11-36 micrograms/mL and 16-69 micrograms/mL, respectively. AE was detected in all of the 31 samples at the levels of 0.03-1.3 micrograms/mL. When aloe drinks were stored for 4 weeks at 5 degrees C after opening the bottle, decrease of BA and isoBA, and increase of AE and aloin-dimers A, B, C and D were observed in most cases. However, in a few aloe drinks, all of BA, isoBA, aloin-dimers A, B, C, D and AE decreased. In these drinks, the existence of aloin-trimer was elucidated by LC/MS analyses. These data suggested that BA in aloe drinks is converted to the dimer and then to the trimer during storage.
Shindo
Tetsuya
T
Tokyo Metropolitan Research Laboratory of Public Health: 3-24-1, Hyakunincho, Shinjuku-ku, Tokyo 169-0073, Japan.
Ushiyama
Hirofumi
H
Kan
Kimiko
K
Uehara
Shin-ichi
S
Yasuda
Kazuo
K
Takano
Ichiro
I
Saito
Kazuo
K
D000504:Aloe; D000873:Anthracenes / Q000737:chemistry / Q000302:isolation & purification*; D000880:Anthraquinones; D004642:Emodin / Q000032:analysis; D005504:Food Analysis; D005519:Food Preservation; D013696:Temperature; D013997:Time Factors
D000873:Anthracenes; D000880:Anthraquinones; C045601:barbaloin; C518327:aloe emodin; D004642:Emodin