Table 1.

Comparison of antioxidant activities between peptides (0–3 kDa) of four different species

Fractions	Molecular weight	Concentration (mg/mL)	DPPH radical scavenging activity	Hydroxyl radical scavenging activity	References
LMWSPS	0–3 kDa	1.0	58.3% ± 2.89%	44.5% ± 2.8%	This study
MPTH-I		5.0	65.52% ± 3.86%	58.78% ± 3.05%	Hu et al. (2020a, b)
BPH4		1.0	69.9% ± 3.5%	ND	Cheng et al. (2016)
BCFP		5.03	50%	ND	Alahyaribeika et al. (2021)

LMWSPs low-molecular-weight Spirulina peptides, MPTH-I Monkfish muscle proteins hydrolysate, BPH4 blood plasma hydrolysate, PBCF peptides derived from biodegradation of chicken feather, Note no detected