In this study the effects of cutting on the drying of
rosehips and the loss of vitamin C during drying were
investigated. The present study also stresses the potential
application of inert gas processing of rosehip during
drying. For whole fruits, drying curves at various temperatures
and loss of vitamin C during drying were identified.
Degradation kinetics of vitamin C during drying
of rosehips has been described by first-order kinetics.
Activation energy and the rate constant were described
as a function of solid moisture content. When a comparison
made with respect to drying time between pre-treat
and whole fruits, it was found that cut into pieces and
peeling processes accelerated the drying procedure and
temperature had a pronounced effect for both of them
during drying. When the same drying time was considered,
loss of vitamin C in the cut fruits was more than
that of whole fruits. However, loss of vitamin C of whole
fruits was more than that of cut fruits when drying was
completed. Cutting of rosehips could be recommended
before drying process because of its short drying time
and high nutrition quality comparing to whole fruits.
Raising the temperatures decreases the retention of vitamin
C for the fruits that cut into pieces, especially at the
beginning of the drying. When the surface area exposed
with air was increased, loss of vitamin C also increased.
The loss of vitamin C was increased depending on the
rate of the oxygen in the air–CO2 mixtures used as a drying
medium. The results showed that the degradation of
vitamin C could be reduced by using an inert gas. Basic
information for the applications of inert gas and pretreatment
of fruits to retain valuable nutrients by avoiding
oxidation has been suggested in the present study.
In this study the effects of cutting on the drying ofrosehips and the loss of vitamin C during drying wereinvestigated. The present study also stresses the potentialapplication of inert gas processing of rosehip duringdrying. For whole fruits, drying curves at various temperaturesand loss of vitamin C during drying were identified.Degradation kinetics of vitamin C during dryingof rosehips has been described by first-order kinetics.Activation energy and the rate constant were describedas a function of solid moisture content. When a comparisonmade with respect to drying time between pre-treatand whole fruits, it was found that cut into pieces andpeeling processes accelerated the drying procedure andtemperature had a pronounced effect for both of themduring drying. When the same drying time was considered,loss of vitamin C in the cut fruits was more thanthat of whole fruits. However, loss of vitamin C of wholefruits was more than that of cut fruits when drying wascompleted. Cutting of rosehips could be recommendedbefore drying process because of its short drying timeand high nutrition quality comparing to whole fruits.Raising the temperatures decreases the retention of vitaminC for the fruits that cut into pieces, especially at thebeginning of the drying. When the surface area exposedwith air was increased, loss of vitamin C also increased.The loss of vitamin C was increased depending on therate of the oxygen in the air–CO2 mixtures used as a dryingmedium. The results showed that the degradation ofvitamin C could be reduced by using an inert gas. Basicinformation for the applications of inert gas and pretreatmentof fruits to retain valuable nutrients by avoidingoxidation has been suggested in the present study.
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