3.2.4. High pressure extraction
Fig. 2d shows that HPE extracts have a TPC lower than the control whatever the pressure used (0.1–100 MPa), whereas the TFC was higher than the control for 0.1 and 50 MPa.The decrease in phenol content could be partly attributed to enzymatic oxidation. Extraction under high pressure results in a disturbance, disruption of tissue and especially cellular decompartimentalization leading to considerable enzyme–substrate interaction during processing resulting in increased risk of enzymatic oxidation. Furthermore, high pres-sures can cause an improvement of enzyme activity thereby causing the degradation of phenolic compounds in plants(Tauscher, 1995; Ahmed and Ramaswamy, 2006; Terefe et al.,2013). Thus, high pressure leads to a degradation of cellular structure of the plant material which allows the improvement
of the extraction efficiency but high pressure also leads toa degradation of phenolic compounds after their extraction either by oxidation or by rearrangement with other molecules.Not all phenolic compounds have the same sensitivity to these phenomena which explains that we can have a decrease of TFC and an increase of TPC.
3.2.4. High pressure extractionFig. 2d shows that HPE extracts have a TPC lower than the control whatever the pressure used (0.1–100 MPa), whereas the TFC was higher than the control for 0.1 and 50 MPa.The decrease in phenol content could be partly attributed to enzymatic oxidation. Extraction under high pressure results in a disturbance, disruption of tissue and especially cellular decompartimentalization leading to considerable enzyme–substrate interaction during processing resulting in increased risk of enzymatic oxidation. Furthermore, high pres-sures can cause an improvement of enzyme activity thereby causing the degradation of phenolic compounds in plants(Tauscher, 1995; Ahmed and Ramaswamy, 2006; Terefe et al.,2013). Thus, high pressure leads to a degradation of cellular structure of the plant material which allows the improvementof the extraction efficiency but high pressure also leads toa degradation of phenolic compounds after their extraction either by oxidation or by rearrangement with other molecules.Not all phenolic compounds have the same sensitivity to these phenomena which explains that we can have a decrease of TFC and an increase of TPC.
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