title: [Absorption spectra study of the association nanoparticle system of berberine-[AuI4]- and its analytical application].
abstract: In 0.008 mol x L(-1) HCl medium, [AuCl4]- and I- combine to form [AuI4]-. [AuI4]- reacts with berberine (BB) to form (AuI4-BB) association molecule. The molecules aggregate automatically owing to strong hydrophobic and molecular forces. And (AuI4-BB)n association nanoparticles with orange-yellow color were observed. It exhibits a resonance scattering peak at 520 nm. The absorption peak for the nanoparticle system and the [AuI4]- is at 350 nm. However, the absorbance values for the nanoparticle system increased in the visible light region. Under the conditions chosen, the BB concentration in the range of 0.8 x 10(-6) mol x L(-1)-20 x 10(-6) mol x L(-1) is linear to the A(450 nm) value. The results show that the formation of (AuI4-BB)n nanoparticles produces the resonance scattering effect and the orange-yellow color.
authors.affiliation: Guilin Sanjin Pharmaceutical Company, Guilin 541004, China.
authors.forename: Li-sheng
authors.initials: LS
authors.lastname: Wang
authors.forename: Jie-ming
authors.initials: JM
authors.lastname: Zou
authors.forename: Zhi-liang
authors.initials: ZL
authors.lastname: Jiang
authors.forename: Zu-he
authors.initials: ZH
authors.lastname: Liao
authors.forename: Hong-cheng
authors.initials: HC
authors.lastname: Pan