The effect of pressurization and cold storage of strawberry purée on colour, anthocyanins, ascorbic acid
and pectin methylesterase was investigated. Samples were treated at pressures of 100, 200, 300 and
400 MPa, at two temperatures, 20 C and 50 C, for 15 min. Ascorbic acid content remained fairly
constant after all the high pressure treatments in comparison to the control. However, the values of the
samples pressurized at 50 C were lower than the samples pressurized at 20 C. Concentration of
anthocyanins remained similar after all pressure treatments at both temperatures. Pectin methylesterase
decreased in the samples pressurized at 50 C, and it is remarkable that with this enzyme inactivation
a gel-network formation in the strawberry purée was not found. However, a gel-network was observed
in the control and in all the samples pressurized at 20 C throughout cold storage. Immediately after
pressurization, strawberry colour showed significant differences between the two temperatures, but no
differences were observed between pressures. However, after cold storage no significant differences were
observed, for hue and chroma parameters, between the samples pressurized at the two temperatures.
2012 Elsevier Ltd. All rights reserved.
The effect of pressurization and cold storage of strawberry purée on colour, anthocyanins, ascorbic acidand pectin methylesterase was investigated. Samples were treated at pressures of 100, 200, 300 and400 MPa, at two temperatures, 20 C and 50 C, for 15 min. Ascorbic acid content remained fairlyconstant after all the high pressure treatments in comparison to the control. However, the values of thesamples pressurized at 50 C were lower than the samples pressurized at 20 C. Concentration ofanthocyanins remained similar after all pressure treatments at both temperatures. Pectin methylesterasedecreased in the samples pressurized at 50 C, and it is remarkable that with this enzyme inactivationa gel-network formation in the strawberry purée was not found. However, a gel-network was observedin the control and in all the samples pressurized at 20 C throughout cold storage. Immediately afterpressurization, strawberry colour showed significant differences between the two temperatures, but nodifferences were observed between pressures. However, after cold storage no significant differences wereobserved, for hue and chroma parameters, between the samples pressurized at the two temperatures. 2012 Elsevier Ltd. All rights reserved.
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