title: [Contents of barbaloin-related compounds in aloe drinks and their change during storage].
abstract: 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.
authors.affiliation: Tokyo Metropolitan Research Laboratory of Public Health: 3-24-1, Hyakunincho, Shinjuku-ku, Tokyo 169-0073, Japan.
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Shindo
authors.forename: Hirofumi
authors.initials: H
authors.lastname: Ushiyama
authors.forename: Kimiko
authors.initials: K
authors.lastname: Kan
authors.forename: Shin-ichi
authors.initials: S
authors.lastname: Uehara
authors.forename: Kazuo
authors.initials: K
authors.lastname: Yasuda
authors.forename: Ichiro
authors.initials: I
authors.lastname: Takano
authors.forename: Kazuo
authors.initials: K
authors.lastname: Saito
mesh_terms: 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
chemical_list: D000873:Anthracenes; D000880:Anthraquinones; C045601:barbaloin; C518327:aloe emodin; D004642:Emodin