Abstract
Fish skin, a by-product from fish processing industries, still contains a significant amount of protein-rich material. Gelatin was extracted from Nile tilapia skin with the yield 20.77 ± 0.80 % wet weight. Gelatin was then separately hydrolyzed by proteases, including bromelain, papain, trypsin, flavourzyme, alcalase and neutrase. Low molecular weight gelatin hydrolysate (<10 kDa) has a great potential as an antioxidant agent. Flavourzyme hydrolysate has potent activity on ABTS radical scavenging (1,413.61 ± 88.74 μg trolox/mg protein) and also inhibits the oxidation of linoleic acid at a high level (59.74 ± 16.57 % inhibition). The greatest reducing power is in alcalase hydrolysate (4.951 ± 1.577 mM trolox/mg protein). While, bromelain hydrolysate has the highest ferrous ion chelating activity (86.895 ± 0.061 %). Evaluation of the angiotensin-I-converting enzyme’s inhibitory activity indicates that all hydrolysates have great potency as an antihypertensive agent. All studied tilapia skin gelatin hydrolysates contain potent antioxidant and anti-hypertensive effects.
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Acknowledgments
The authors thank the National Research Council of Thailand and the Graduate School of Chiang Mai University for the financial support.
Conflict of Interest
All listed authors have nothing to disclose.
Author Contributions
All experiments were mainly carried out by SC, a Ph.D. candidate, under supervision of HN. While SJ, NR and NS are co-supervisors of SC. The primary supporting grant (National Research Council of Thailand) was given to SJ.
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Choonpicharn, S., Jaturasitha, S., Rakariyatham, N. et al. Antioxidant and antihypertensive activity of gelatin hydrolysate from Nile tilapia skin. J Food Sci Technol 52, 3134–3139 (2015). https://doi.org/10.1007/s13197-014-1581-6
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DOI: https://doi.org/10.1007/s13197-014-1581-6