Drying Kinetics of Pandanus Leaf by Infrared Radiation Combine Hot Air
1*
,
2
3
Anusara Nadee
1*
Yutthana Tirawanichakul
2
and Supawan Tirawanichakul
3
89
1 23
4
5 3
678 19:;<=
>?
@
1 A BC
1DA:6 :;<=
D C
E
C
3
1 F :
G
5 3
A 5 C
H
:8 A: A 3
A A BC
1 C
5 C
:; 1 G
1:
I?
=
12 ;2 2 ; > 6 A BC
1 9 ;J 1DA:6 B 3
1
A BC
1
9 5 4
:8 <
1; 3
11 2E
:; =
D C
D
A BC
1
1 A BC
1D G
1 B K
5 45-65
°
C E
3
1
3
1 F : 500
1000 W 9 5 <
4
: =
56C
9 5 <
4
C
J 1DA:6 K
G
D G
1 400-600% 5 6 T BC
1
8-12% 5 6 T BC
1 6 5 E
3
A 2 V
1 ;A G
3
6
A BC
12 K
1J?
4
:5<=
B K
5 A BC
1 K
1J?
4
6G
9G
9 5 4
:8 <
1; 3
11 2E
:; 1 AA2E
1 19 6> 6 =
:B5 5 =
D C
E
2 ; > 6 A BC
1
C
3
1 F : 1000 W G
5 3
A 5 C
A BC
1 C
5 C
G
1:
9<
AA2E
1 Logarithmic G
AA2E
1 =
D C
E
A BC
1 C
3
1 F : 500 W G
5 3
A 5 C
9<
AA2E
1J 1 Page H V
1 9G
D C
:9 1 3
A AA2E
1 3
1 G
D C
9 ;J 1V 6 3
\ ;A G
C
9<
63
9G
D AA
CIE (L*, a*
b*)
1DBC
:Bb
G
c5G
59 5 6 6G
1 3
G
15 3
E
93
d =
95%
9:
:
9;
: 2 ; > 6 A BC
1/ 3
1 F : /DA:6 /9 ;
Abstract
The objective of this research was to study drying of Pandanus leaf for herbal tea by infrared radiation (IR)
combine hot air (HA). Determination of drying kinetics, physical quality and specific energy consumption were
presented. The experiments were carried out under the conditions of infrared radiation power value of 1000 and 500
W and drying temperature range between 45 and 65
°
C. initial moisture content of Pandanus leaf was between 400
and 600% dry-basis and the final moisture content of dried leaf with all three IR was of 8-12% dry-basis. The
experimental results showed that drying rate increased with increase of drying temperature whilst specific energy
consumption proportionally decreased with increase of drying temperature. Determination of drying kinetic of
Pandanus leaf replied that simulated data using Logarithmic model for IR1000W+HA and HA. Using Page model for
IR500W+HA had a good relation to experimental data. For product quality analysis, percentage of rehydration and the
colorness value (CIELAB:L*, a* and b*) from IR+HA and HA dried Pandanus leaf , significantly (P
≤
0.05).
Keyword
: Drying kinetics/Infrared radiation/Pandanus/Quality
1
3
>?
@ 8 dd H J > 5:95 9 > 5> 6 5B 3
1J 9 E
: B DBdG
23
1B 3
1J 90112
2
>. ., 9 F 9
> 6 5B 3
1J 9 E
: B DBdG
23
1B 3
1J 90112
3
>. ., 9 > 5:95 9 > 5> 6 5B 3
1J 9 E
: B DBdG
23
1B 3
1J 90112
∗
Corresponding author: e-mail:
