An Environmentally Friendly Flow Injection-Gas Diffusion System Using Roselle (Hibiscus sabdariffa L.) Extract as Natural Reagent for the Photometric Determination of Sulfite in Wines

Table 1

The analytical performances of spectrometric determination of sulfite using various natural reagents.

Crude extract	Reagent	Method	Linear range (mg L^−1)	LOD (mg L^−1)	Sample throughput (h^−1)	Samples	Ref.
Sweet potato root (Ipomoea batatas (L.) Lam.)	Polyphenol oxidase	FI	3.2–48	0.18	26	White wine, white vinegar, juice	[19]
Tibouchina granulosa flowers	Anthocyanin	Batch	2–10	—	—	White wine	[20]
Roselle (Hibiscus sabdariffa L.)	Anthocyanin	FI-GD	5–100	2	21	Sparkling wine, white wine, red wine	This work