Extraction of antioxidative and antihypertensive ... - Semantic Scholar
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Extraction of antioxidative and antihypertensive ... - Semantic Scholar
Extraction of antioxidative and antihypertensive bioactive peptides from Parkia speciosa seeds Hwee-Leng Siow a,b, Chee-Yuen Gan b,⇑ a b
Bioprocess Division, School of Industrial Technology, Universiti Sains Malaysia, 11800 USM, Penang, Malaysia Centre for Advanced Analytical Toxicology Services, Universiti Sains Malaysia, 11800 USM, Penang, Malaysia
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Article history: Received 29 March 2013 Received in revised form 3 June 2013 Accepted 6 June 2013 Available online 15 June 2013 Keywords: Antioxidative Antihypertensive Bioactive peptide Parkia speciosa
a b s t r a c t Antioxidative and antihypertensive bioactive peptides were successfully derived from Parkia speciosa seed using alcalase. The effects of temperature (25 and 50 °C), substrate-to-enzyme ratio (S/E ratio, 20 and 50), and incubation time (0.5, 1, 2 and 5 h) were evaluated based on 2,2-diphenyl-1-picrylhydrazyl (DPPH), ferric reducing antioxidant power (FRAP) and angiotensin-converting enzyme (ACE) assays. Bioactive peptide extracted at a hydrolysis condition of: temperature = 50 °C, S/E ratio = 50 and incubation time = 2 h, exhibited the highest DPPH radical scavenging activity (2.9 mg GAE/g), reducing power (11.7 mM) and %ACE-inhibitory activity (80.2%). The sample was subsequently subjected to fractionation and the peptide fraction of
