Assessment and comparison of phytochemical constituents and biological activities of bitter bean (Parkia speciosa Hassk.) collected from different locations in Malaysia

Table 9 Correlation analysis between identified phytochemicals and biological activities of P. speciosa seed

Phytochemicals	DPPH activity	FRAP activity	Antibacterial activity
TFC	0.941**	0.966**	0.906**
TPC	0.883**	0.860**	0.933**
Quercetin	0.911**	0.894**	0.917**
Rutin	0.728*	0.741*	0.611 ^n.s
Kaempferol	0.930**	0.862**	0.889**
Catechin	0.886**	0.841**	0.847**
Luteolin	0.886**	0.900**	0.895**
Myricetin	0.820**	0.871**	0.755*
Gallic acid	0.900**	0.844**	0.921**
Ferulic cid	0.749*	0.669 ^n.s	0.882**
Caffeic acid	0.525^n.s	0.627^n.s	0.600 ^n.s
trans-Cinnamic acid	0.861**	0.794*	0.781*
p-coumaric acid	0.619^n.s	0.406^n.s	0.473^n.s

n.s, * and ** represent non-significant, significant at p < 0.05 and p < 0.01, respectively

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