Agriculture Reference
In-Depth Information
1.7.1.3
Ginseng
Passive MAP (PVC and LDPE fi lms) at 0, 10 and 20 °C was applied to store fresh
ginseng. The lowest weight loss was recorded at 0 °C (1.9 and 4.9 % for PVC and
LDPE, respectively) and the highest weight loss at 20 °C (5.6 and 6.6 % for PVC
and LDPE, respectively). Storage at 0 °C, especially in PVC packages helped to
obtain lower decay rate (1 %) while at the same time its reducing sugar content
increased from initial 8.2 to 22, 23.2 and 39.9 mg/g at 0, 10 and 20 °C, respectively.
The shelf life of ginseng was prolonged up to 210 days (Hu et al.
2005
).
American ginseng roots with an antimicrobial agent (dipping in 0.5 % DF-100
solution for 5 min), were stored at 2 °C under CA (2 % O
2
and 2, 5, and 8 % CO
2
)
or passive MA [PD-941 (high), PD-961 (medium) and PD-900 (low permeability)
polyolefi n fi lms used] conditions and studied by Jeon and Lee (
1999
). Ginseng sam-
ples stored under CA at 5 % CO
2
showed the least change in individual and total
ginsenosides. No changes in free sugars (17.74 % total sugars at harvest and 16.48
and 19.34 for CA at 5 % CO
2
and PD-961, respectively) were recorded after 3
months.
Macura et al. (
2001
) investigated the survival ratio of inoculated
C. botulinum
in
MA (Winpac medium transmission laminated fi lm used) ginseng roots stored at 2,
10, and 21 °C. The development of anaerobic conditions was more rapid at higher
temperatures. C. botulinum toxin production at 10 °C was detected after 14 weeks
of storage, before all products were spoiled and rendered unfi t for human consump-
tion. At 21 °C, the product spoiled fi rst and then it became toxic.
1.7.2
Tubers
1.7.2.1
Sweet Potato
Sweet potatoes were sliced and stored under MA conditions using a low (PD-900),
medium (PD-961) and high (PD-941 polyolefi n) permeability fi lm at 2 °C or 8 °C
for 14 days. Samples stored in PD-900 and PD-961 fi lms had signifi cantly lower
weight losses compared to those in PD-941 fi lm bags. Higher storage temperature
doubled the weight loss compared to samples stored at 2 °C. B-carotene content of
fresh-cut sweet potatoes at the end of storage had an average of 6.01 mg per 100 g
of FW (Erturk and Picha
2007
).
McConnell et al. (
2005
) packed shredded sweet potatoes from two major com-
mercial cultivars ('Beauregard' and 'Hernandez') in low (PD-900) and medium
(PD-961) O
2
permeability bags at 4 °C and fl ushed them with gas composed of 5 %
O
2
and 4 % CO
2
. Samples from 'Beauregard' and 'Hernandez' cultivars stored under
MAP did not undergo any change in ascorbic acid contents (15.4 and 14.7 mg/100 g,
respectively). Sweet potatoes in PD-900 and PD-961 exhibited more than one log
lower total aerobic counts compared to control and PD-941 samples (7 and 8.2 log
CFU/g, respectively) for 'Beauregard' cultivar.
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