. 2022 Mar 23;9:862689. doi: 10.3389/fnut.2022.862689

Table 5.

Pearson correlation coefficients between antioxidant activity, free radical, lipid peroxidation, and volatile compounds in milk.

Item^a		DPPH	$O_{2}^{-}$	H₂O₂	MDA	LPO	Alcohols	Ketones	Aldehydes	Esters	Hydrocarbons
TAC	r	−0.0411	−0.1542	−0.1341	−0.4537	−0.2005	0.0420	−0.5060	0.3012	0.0357	0.2243
	P	0.8800	0.5686	0.6206	0.0775	0.4564	0.8773	0.0455	0.2570	0.8955	0.4037
SOD	r	0.6970	−0.7615	−0.8230	−0.8287	−0.7142	−0.9227	0.4996	0.4128	−0.8466	−0.6261
	P	0.0027	0.0006	<0.0001	<0.0001	0.0019	<0.0001	0.0488	0.1121	<0.0001	0.0095
GSH-Px	r	0.6195	−0.8021	−0.7508	−0.8312	0.0619	−0.8035	0.0028	0.6719	−0.7387	−0.3196
	P	0.0105	0.0002	0.0008	<0.0001	0.8134	0.0002	0.9919	0.0044	0.0011	0.2276
GSSG	r	0.5612	−0.7616	−0.7017	−0.8408	−0.7582	−0.7771	−0.0835	0.7553	−0.6945	−0.2097
	P	0.0237	0.0006	0.0024	<0.0001	0.0007	0.0004	0.7586	0.0007	0.0028	0.4357
GSH	r	0.8133	−0.5997	−0.7936	−0.4185	−0.6945	−0.6517	0.1501	0.5373	−0.7432	−0.1274
	P	0.0001	0.0141	0.0002	0.1066	0.0028	0.0062	0.5789	0.0318	0.0010	0.6382
CAT	r	0.4469	−0.6722	−0.6473	−0.8786	−0.7119	−0.5162	0.0371	0.3801	−0.5692	−0.2454
	P	0.0827	0.0043	0.0067	<0.0001	0.0020	0.0407	0.8914	0.1465	0.0214	0.3597

^aTAC, total antioxidant capacity; SOD, superoxide dismutase; GSH-Px, glutathione peroxidase; GSSG, oxidized glutathione; GSH, reduced glutathione; CAT, catalase; DPPH, 2,2-diphenyl-1-picrylhydrazyl scavenging activity; $O_{2}^{-}$ superoxide anion; H₂O₂, hydrogen peroxide; MDA, malondialdehyde; LPO, lipid peroxidation.