Extraction of phenolic compounds from Juglans regia L. optimized by response surface methodology
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resumo
The studies on plant secondary metabolites extraction, namely phenolic compounds, are increasing due
to their in vitro bioactivity and marked effects on oxidative process related to several health diseases.
Moreover, they have been widely used in pharmaceuticals, functional foods and natural cosmetics [1].
The solid-liquid extraction of these compounds from biomass is usually carried out using organic
solvents such as methanol, ethanol, acetone and ethyl acetate. In this context, microwave assisted
extraction (MAE) is one of the most employed alternative extraction methods commonly using methanol
or ethanol in different concentrations by dilution with water. Ethanol will be selected in this work due to
its lower toxicity. In addition, this alcohol can be obtained from renewable sources and is safe for human
consumption. Among the advantages reported for MAE are its lower extraction times and solvent
consumption, when compared to conventional methods [2-4].
Our research group is interested in the green extraction of valuable compounds from biomass and there
are previous evidences that walnut leaves are rich in phenolic acids and flavonoids [5]. In the present
work, a 5-level full factorial Box–Behnken design was successfully implemented for maceration and
MAE optimization, in which the ethanol concentration (Et), processing time (t), temperature (T), and
solid/liquid ratio (S/L) were relevant independent variables. HPLC-DAD results showed that MAE is more
effective extracting higher contents of phenolic compounds than conventional maceration in a lower
processing time.
