The use of high hydrostatic pressure (HHP) provides a reliable way of obtaining high quality food. The aim of this
work was to analyze the effect of high pressure treatments on the microstructure and textural properties of
astringent and non-astringent (95–98% CO2,24 h, 24 °C) persimmon‘Rojo Brillante’. Samples were submitted to
different HHP treatments (200 MPa and 400 MPa during 1, 3 and 6 min). The microstructural changes observed
by Low Temperature Scanning Electron Microscopy and Light Microscopy were related to the improvement in the
diffusion and extractability of tannins and acid compounds of this fruit. Some textural properties (firmness and
cohesiveness), pH and titratable acidity were also analyzed. Cell wall disruption and migration of the cell content
to the intercellular spaces took place when 200 MPa was applied. Precipitated tannins could be observed in the
intercellular spaces of the astringent samples, while they remained inside the tannic cells of the non-astringent
ones. The cellular degradation was more obvious and the concentration of solutes in the intercellular spaces
increased when 400 MPa was applied. In this way, HHP favored the diffusion of tannins and other soluble
components to the intercellular spaces, which could be related to a higher extractability of these nutritional
compounds in persimmon ‘Rojo Brillante’. The tissue from non-astringent samples was more affected by HHP
treatments. Despite the greater diffusion of soluble compounds, the application of HHP provoked undesirable
effects on texture, such as a decrease in flesh firmness and cohesiveness in both astringent and non-astringent
samples. pH increased in both astringent and non-astringent samples when 200 MPa was applied due to the
insolubilization of tannins, while titratable acidity decreased for the same reason. According to the pH values
obtained, extractability of acid compounds could be improved when 400 MPa is applied.
The use of high hydrostatic pressure (HHP) provides a reliable way of obtaining high quality food. The aim of this
work was to analyze the effect of high pressure treatments on the microstructure and textural properties of
astringent and non-astringent (95–98% CO2,24 h, 24 °C) persimmon‘Rojo Brillante’. Samples were submitted to
different HHP treatments (200 MPa and 400 MPa during 1, 3 and 6 min). The microstructural changes observed
by Low Temperature Scanning Electron Microscopy and Light Microscopy were related to the improvement in the
diffusion and extractability of tannins and acid compounds of this fruit. Some textural properties (firmness and
cohesiveness), pH and titratable acidity were also analyzed. Cell wall disruption and migration of the cell content
to the intercellular spaces took place when 200 MPa was applied. Precipitated tannins could be observed in the
intercellular spaces of the astringent samples, while they remained inside the tannic cells of the non-astringent
ones. The cellular degradation was more obvious and the concentration of solutes in the intercellular spaces
increased when 400 MPa was applied. In this way, HHP favored the diffusion of tannins and other soluble
components to the intercellular spaces, which could be related to a higher extractability of these nutritional
compounds in persimmon ‘Rojo Brillante’. The tissue from non-astringent samples was more affected by HHP
treatments. Despite the greater diffusion of soluble compounds, the application of HHP provoked undesirable
effects on texture, such as a decrease in flesh firmness and cohesiveness in both astringent and non-astringent
samples. pH increased in both astringent and non-astringent samples when 200 MPa was applied due to the
insolubilization of tannins, while titratable acidity decreased for the same reason. According to the pH values
obtained, extractability of acid compounds could be improved when 400 MPa is applied.
การแปล กรุณารอสักครู่..
