Optimization of low thermal treatments to increase hydrophilic phenols in the Alperujo liquid fraction
DOI:
https://doi.org/10.3989/gya.0227221Keywords:
Alperujo, Hydroxytyrosol, Olive mill by products, Phenolic compounds, Thermal treatments, TPOMWAbstract
Hydrophilic phenols are the main bioactive compounds in alperujo. Among them, 3,4-Dihydroxyphenylglycol (DHPG), Hydroxytyrosol (HT) and Tyrosol (Ty), are the most relevant and deeply studied. These compounds exhibit high antioxidant capacity and a wide range of health benefits as well as technologically promising properties. Given that, their recovery represents an attractive opportunity to valorize this by-product. In this work low thermal treatments were applied to alperujo in order to obtain phenol-enriched liquid fractions. Optimization assays combining different levels of temperature (30 to 90 ºC), time (60 to 180 min) and water content (70 to 90%), followed by response surface methodologies were performed. The results indicated that by applying optimal conditions, is possible to obtain theoretical yields of Total phenols, DHPG, HT and Ty of 2.4, 957.8, 3.4 and 6.4 times greater, respectively, than raw dry alperujo. Interestingly, all the evaluated conditions can be reproduced with low investment in a standard olive oil industry.
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Instituto Nacional de Tecnología Agropecuaria
Grant numbers PE I 150;PD I 518
Consejo Superior de Investigaciones Científicas
Grant numbers EMHE MHE-200059
