AI Article Synopsis
- The market value of crustaceans decreases during storage due to melanosis, which is caused by polyphenol oxidases.
- Sulfite derivatives are commonly used to prevent this, but they have unhealthy effects, prompting the search for natural preservatives.
- A study characterized a crude enzymatic extract from whiteleg shrimp and tested various halophyte plant extracts, finding that they were more effective in inhibiting diphenol oxidase than sodium sulfite, with purslane showing the strongest effect due to its high content of certain beneficial compounds.
Article Abstract
The market value of crustaceans depreciates during storage due to the appearance of melanosis caused by polyphenol oxidases. Sulfite derivatives are used as melanosis-inhibiting agents, but their unhealthy effects make it preferable to replace them with natural preservatives. In this work, a crude enzymatic extract from whiteleg shrimp (Penaeus vannamei) was characterized and used to test the diphenol oxidase-inhibiting activity of polyphenol extracts of five underutilized halophyte plants, namely crystalline ice plant, seaside arrowgrass, purslane, sea fennel, and seashore aster. The extracts inhibited diphenol oxidase activity more efficiently than sodium sulfite. The purslane extract was rich in isoorientins, isovitexin, and apigenin, and showed the highest inhibiting effect, being this classified as mixed or non-competitive. Hydroxyl groups in the phenyl B ring could be responsible for the inhibitory activity of the extract. The polyphenol extracts tested in this work could be promising melanosis-inhibiting agents of interest for seafood industries.
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| http://dx.doi.org/10.1016/j.foodchem.2021.129649 | DOI Listing |
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Halophytes as a potential source of melanosis-inhibiting compounds. Mechanism of inhibition of a characterized polyphenol extract of purslane (Portulaca oleracea).
Food Chem
September 2021
Institute of Food Science, Technology and Nutrition (CSIC), 10 José Antonio Novais St, 28040 Madrid, Spain. Electronic address:
Article Synopsis
- The market value of crustaceans decreases during storage due to melanosis, which is caused by polyphenol oxidases.
- Sulfite derivatives are commonly used to prevent this, but they have unhealthy effects, prompting the search for natural preservatives.
- A study characterized a crude enzymatic extract from whiteleg shrimp and tested various halophyte plant extracts, finding that they were more effective in inhibiting diphenol oxidase than sodium sulfite, with purslane showing the strongest effect due to its high content of certain beneficial compounds.
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