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ABSTRACT
A sensitive chemiluminescence (CL) induced by light for the determination of riboflavin with flow injection analysis is developed. Riboflavin shows a strong enhancement effect on the CL reaction of luminol oxidized by periodate after the photochemical reaction of riboflavin in alkaline solution, and the enhancing effect of riboflavin disappears under dark conditions. Oxygen can further improve the enhancing effect of the riboflavin in this CL system, and the effects were also investigated. And based on this phenomenon, a very sensitive method of various surfactants, β-cyclodextrin and organic solvents on this CL system for the determination of riboflavin was described. The range of the linear response for riboflavin using this method is ca. 2.4×10−8 ~ 1.0 × 10−6 mol/L, and the detection limit (S/N = 3) is l.0×10−8 mol/L. The applicability of the method was demonstrated by the determination of riboflavin in pharmaceutical preparation.