Table 4.

Method of selenium modification for polyphenols.

Selenization System	Principal Operating Parameter	Selenium Content/(mg/g)	Combination	Reference
Dihydromyricetin-Na2SeO3	2 g dihydromyricetin, 0.54 g Na2SeO3 55% ethanol 60 mL 1 mol/L HCl to adjust pH to 3–4 Reaction at 55 °C for 20 min Vacuum drying for 48 h	6.54	C-Se	[66]
Tea polyphenols-selenium	0.2 g tea polyphenols were dissolved in H2O and added to the Se4+ solution. pH = 4–5 60 °C for 20 min	\	Se4+ substituted C-H on the benzene ring	[67]
Quercetin-SeO₂	Quercetin 0.75 g (2.5 mmol) 0.14 g (1.25 mmol) of SeO₂ dissolved in 10 mL of absolute ethanol. Keep the pH at 2–3 The reaction was carried out at 60 °C for 10 h under N2 protection	43.53	Se-O	[68]