Silica-titania xerogel doped with Mo,P-heteropoly compounds for solid phase spectrophotometric determination of ascorbic acid in fruit juices, pharmaceuticals, and synthetic urine

Table 4 The results of solid phase spectrophotometric AA determination (10 mg/L) in the presence of polyphenols

Polyphenol	Interference threshold, mg/L
	Silica-titania xerogel (Ti12.5HPC20)	Silica-titania xerogel doped with HPC (Ti5HPC20)
Taxifolin	<0.5	50
Dopamine	<0.5	50
Caffeic acid	<0.5	50
Gallic acid	<0.5	100
Quercetin	100	200
Rutin	100	250
Ferulic acid	100	250
Catechol	<0.5	50

ISSN: 2661-801X