Determination of Polar Compounds in Guava Leaves Infusions and Ultrasound Aqueous Extract by HPLC-ESI-MS

Table 3

Comparison between total polar compound (mg/g) determined by HPLC and antioxidant activity evaluated by FRAP (μM of FeSO₄ equivalents/mg) and ABTS (μM of Trolox equivalents/mg).

Sample	TPC by HPLC	FRAP	ABTS
AE	157 ± 6.0^a	3026.7 ± 586.4^a	1127.6 ± 69.0^a
I3	49.6 ± 0.5^c	314.2 ± 15.1^b	155.7 ± 1.1^b
I5	53.8 ± 0.2^b	285.3 ± 7.0^b	217.6 ± 19.2^b
I7	43.1 ± 0.4^d	285.7 ± 7.0^b	178.2 ± 1.3^b

Means in the same column with different letter are significantly different (P < 0.05).