Investigating carotenoid loss after drying and storage of
Investigating carotenoid loss after drying and storage of
Investigating carotenoid loss after drying and storage of
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121<br />
5. Mozambican field study<br />
Table 5-1: Total <strong>carotenoid</strong> <strong>loss</strong>es <strong>after</strong> <strong>drying</strong> influenced by treatment (dryer,<br />
chipping, trial) using MGCL01 <strong>and</strong> Resisto varieties <strong>of</strong> OFSP<br />
Variety Chipping Dryer<br />
Replica<br />
-tion<br />
Dry<br />
matter<br />
content<br />
(%)<br />
Drying<br />
time*<br />
(h)<br />
Total<br />
<strong>carotenoid</strong><br />
content<br />
(!g.g -1<br />
db)**<br />
Carotenoid<br />
<strong>loss</strong> (%)<br />
Fresh roots 35.4 235.6(6.5)<br />
Tunnel 1st 92.8 26.3 209.7(3.0) 11.0<br />
2nd 95.0 24.8 210.6(7.1) 10.6<br />
Thin chips<br />
Open 1st<br />
2nd<br />
91.8<br />
92.4<br />
24.0<br />
23.7<br />
226.1(9.0)<br />
222.3(3.1)<br />
4.1<br />
5.7<br />
Shade 1st 89.2 26.2 247.7(11.6) -5.1***<br />
MGCL01<br />
2nd 90.6 26.7 228.4(0.7) 3.1<br />
Tunnel 1st 91.8 48.1 194.9(4.5) 17.3<br />
2nd 90.9 47.2 214.9(0.8) 8.8<br />
Slices<br />
Open 1st<br />
2nd<br />
89.3<br />
86.0<br />
48.0<br />
47.2<br />
211.9(5.5)<br />
227.0(0.8)<br />
10.1<br />
3.7<br />
Shade 1st 86.3 49.9 239.0(7.6) -1.4***<br />
2nd 87.4 51.5 246.1(4.9) -4.4***<br />
Fresh roots 27.0 434.4(0.7)<br />
Tunnel 1st 90.7 27.4 384.4(4.1) 11.5<br />
2nd 93.1 24.7 357.8(1.0) 17.6<br />
Thin chips<br />
Open 1st<br />
2nd<br />
91.5<br />
91.6<br />
26.3<br />
24.5<br />
363.1(18.6)<br />
362.6(7.5)<br />
16.4<br />
16.5<br />
Shade 1st 89.2 49.9 408.2(5.8) 6.0<br />
Resisto<br />
2nd 90.5 51.5 393.8(10.8) 9.3<br />
Tunnel 1st 88.6 93.1 382.9(4.5) 11.8<br />
2nd 89.0 51.6 369.5(5.2) 14.9<br />
Slices<br />
Open 1st<br />
2nd<br />
86.1<br />
82.0<br />
99.3<br />
51.6<br />
366.2(5.0)<br />
401.0(7.4)<br />
15.7<br />
7.7<br />
Shade 1st 83.6 99.4 420.6(1.5) 3.2<br />
2nd 73.0 51.5 415.5(1.6) 4.4<br />
* Drying time includes days <strong>and</strong> nights <strong>of</strong> samples spent on dryers.<br />
**Each value represents the mean (st<strong>and</strong>ard deviation) <strong>of</strong> two extractions<br />
***Negative value not significantly different from values in fresh sweet potatoes<br />
Average <strong>and</strong> variation on day/night temperature <strong>and</strong> humidity respectively were 22°C<br />
(12-33°C) <strong>and</strong> 65% (25-95%) in ambient conditions; 26°C (11-55°C) <strong>and</strong> 63% (13-<br />
100%) inside the tunnel dryer.<br />
Independent <strong>of</strong> the dryer or variety, average total <strong>carotenoid</strong> <strong>loss</strong> during <strong>drying</strong> was<br />
9.2%. In all cases, levels <strong>of</strong> <strong>loss</strong> were less than 17.6%. Because control over <strong>drying</strong> was<br />
limited in these field conditions where final dry matter content varied, dry matter was<br />
included as covariate in the analysis <strong>of</strong> variance. The type <strong>of</strong> dryer had a significant<br />
effect (p
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