In another study with ozone, carrots showed an increase in
luminosity after processing and decrease in the chroma (Liew &
Prange, 1994). Similar results were observed in the present work
when carrots were treated with ozone. Carrots washed with
distilled water and with citric acid (0.5%) did not show important
changes in color; carrots treated with chlorine (200 ppm) during
2 min showed an increase in the whiteness index but differences
were not significant (p < 0.05). The white discoloration of carrots is
a product of an enzymatic reaction related with dehydration of the
surface or formation of lignin (Amanatidou, Slump, Gorris, & Smid,
2000). In this research the change in the whiteness index was
significantly different from the control for all of the evaluated
treatments, showing in a minor or major degree of some kind of
dehydration or enzymatic reaction. Samples treated with ultraviolet showed by far the highest change in WI and it was noticeable by sight after processing.
In another study with ozone, carrots showed an increase in
luminosity after processing and decrease in the chroma (Liew &
Prange, 1994). Similar results were observed in the present work
when carrots were treated with ozone. Carrots washed with
distilled water and with citric acid (0.5%) did not show important
changes in color; carrots treated with chlorine (200 ppm) during
2 min showed an increase in the whiteness index but differences
were not significant (p < 0.05). The white discoloration of carrots is
a product of an enzymatic reaction related with dehydration of the
surface or formation of lignin (Amanatidou, Slump, Gorris, & Smid,
2000). In this research the change in the whiteness index was
significantly different from the control for all of the evaluated
treatments, showing in a minor or major degree of some kind of
dehydration or enzymatic reaction. Samples treated with ultraviolet showed by far the highest change in WI and it was noticeable by sight after processing.
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