Investigating carotenoid loss after drying and storage of

Storage
time
(mths)
1
2
4
6
146
6. Effect of pre-treatment
The mean temperature and humidity were 23.1ºC and 70.5% respectively over an 8
month-period with minimum-maximum variations between 19.1-27.7ºC and 42.8-
86.5%.
Carotenoid loss during storage for the main experiment
Total carotenoid loss was determined at different times between one and six months of
storage for dried samples of the Ejumula variety from the main experiment (Table 6-5).
Table 6-5: Total carotenoid content (!g.g -1 ) of Ejumula variety of orange-fleshed
sweet potato after one, two, four and six month-storage influenced under combined
pre-treatments on an insoluble solid basis
Deionised
water a
123.4
(9.9) a
91.2
(14.4) a
74.5
(12.4) b
41.3
(13.1) ab
0.5%
Citric
acid a
132.3
(6.1) abc
93.4
(12.7) a
54.0
(17.6) a
37.1
(3.9) a
0.5%
Citric
acid 1%
Salt a
126.4
(20.8) ab
98.3
(35.6) a
63.4
(20.3) a
42.1
(29.2) ab
1% Salt
b
134.9
(5.5) abc
119.3
(25.4) b
76.2
(20.2) b
43.0
(22.9) ab
1% Ascor-
bic acid.;
1% Salt bc
137.0
(15.6) abc
123.5
(12.3) b
84.6
(11.1) bc
47.7
(16.3) ab
Unsoaked
c
144.1
(2.8) cd
126.1
(16.9) b
104.8
(2.1) d
47.4
(14.4) ab
0.5%
Sod.
meta. cd
138.5
(2.8) bc
123.8
(6.7) b
92.6
(9.5) c
51.2
(2.6) b
1% Ascorbic
acid cd
155.1
(6.0) de
99.4
(31.4) a
96.1
(7.8) c
51.6
(8.0) b
Each value represents the mean (standard deviation) of 2 2 analyses (two drying trials;
two extractions per trial). Two way ANOVA (factors: pre-treatement (9 levels); trial (2
levels) per storage month; Different letters a, b, c, d, e in lines represent significant
differences between treatments. Tukey test; p