4.2. Results obtained from microwave
For vitamins (A, C and E) and MDA values, trend
observed in infrared drier is identical to that in microwave
drier but not amounts of quantities. Therefore, the discussion
given above is valid for microwave drier. Variation of
vitamin A with moisture removals in apricot samples in
different ripeness is illustrated in Fig. 5. As can seen in
the figure values of vitamin A for both samples in different
ripeness increase with decreasing water contents of samples.
In addition, we can see in the figure that values of
vitamin A for the ripe apricot samples are larger than those
for the near-ripe apricot samples. Since vitamin values are
defined as mass of vitamin per total mass of sample that
decreases with decreasing moisture contents of samples,
the values of vitamin A increase with decreasing water contents
of samples. Variation of vitamin C is plotted in Fig. 6
against the moisture removals for both apricot samples in
different ripeness namely the near-ripe and the ripe. As
can be seen in the figure values of vitamin C increase with
0
5
10
15
20
25
MDA (nmol/g)
-5 5 15 25 35 45 55 65
Moisture removal (%)
Riper one
Ripe one
Fig. 4. Variation of malondialdehyde in apricot with moisture removal in
IR drier.
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
Vitamin A (μg/g)
Riper one
Ripe one
-5 5 15 25 35 45 55 65
Moisture removal (%)
Fig. 5. Variation of vitamin A in apricot with moisture removal in
microwave drier.
Riper one
Ripe one
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
Vitamin C (μg/g)
-5 5 15 25 35 45 55 65
Moisture removal (%)
Fig. 6. Variation of vitamin C in apricot with moisture removal in
microwave drier.
0
0.2
0.4
0.6
0.8
1
1.2
Vitamin E (μg/g)
Riper one
Ripe one
-5 5 15 25 35 45 55 65
Moisture removal (%)
Fig. 7. Variation of vitamin E in apricot with moisture removal in
microwave drier