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

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

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