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. 2020 Jul 16;9(7):170. doi: 10.3390/biology9070170

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Total peptides concentration and biological activities of 12-month ripened Parmigiano-Reggiano (PR) peptide fractions. (A) Total peptides concentration. (B) Angiotensin-converting enzyme inhibitory activity. (C) Dipeptidyl-peptidase IV-inhibitory activity. (D) Antioxidant activity. Light grey bars represent PR samples belonging to the high-salt and high-fat group (HH). Dark grey bars represent PR samples belonging to the low-salt and low-fat group (LL). HH represents the average values, considering the samples belonging to the high-salt and high-fat group. LL represents the average values, considering the samples belonging to the low-salt and low-fat group. Average represents the mean values considering all of the 12 PR samples. The x-axis reports the code number of PR samples. Values are means of three assay replications ± standard deviation (SD). Different letters indicate significantly different values (p < 0.05).