Agriculture Reference
In-Depth Information
2.3. Antisymmetric and Symmetric CH 3 and CH 2 and Carbonyl
C=O Ester Molecular Spectral Profiles of Green-Type and
Yellow-Type of CDC Peas ( Pisum sativum )
Tables 1-3 shows molecular structure spectral features of CH functional
groups in terms of the peak height of CH3-antisymmetric (CH3as), CH2-
antisymmetric (CH2as), CH3-symmetric (CH3s), CH2-symmetric (CH2s),
carbonyl C=O ester and their ratios of yellow type and green type of CDC
peas. The results indicated there were no significant differences between the
green-type (cv. CDC Strike) and yellow-type (cv. CDC Meadow) of CDC peas
in spectral peak height of CH 3 -antisymmetric (CH 3 as), CH 2 -antisymmetric
(CH 2 as), the ratio CH 3 -antisymmetric (CH 3 as) to CH 2 -antisymmetric (CH 2 as)
(Table 1) and spectral peak height of CH 3 -symmetric (CH 3 s), CH 2 -symmetric
(CH 2 s), the ratio CH 3 -symmetric (CH 3 s) to CH 2 -symmetric (CH 2 s) (Table 2),
but significant differences in both spectral peak height and area intensity of
carbonyl C=O ester at 1745 cm -1 (Table 3). The CDC Strike (green-type) had
higher peak intensity in carbonyl C=O ester, indicating structure conformation
at 1745 cm-1 differes (Table 3). There were no significant difference in the
ratio of carbonyl C=O ester peak area to total CH (CH3 and CH2) peak area.
Table 1. Molecular structure spectral features of CH functional groups in
terms of the peak height of CH 3 -antisymmetric (CH 3 as), CH 2 -
antisymmetric (CH 2 as) and their ratios of yellow type and green type of
CDC peas
Item
Peas Type
Green-Type
CDC Strike
Yellow-type
CDC Meadow
SEM 1
Peak height of CH 3 -antisymmetric (CH 3 as) and CH 2 -antisymmetric (CH 2 as) 2
C H 3 as
0.0093
0.0089
0.00037
0.0194
0.0181
0.00068
C H 2 as
Ratio CH 3 -antisymmetric (CH 3 as) to CH 2 -antisymmetric (CH 2 as)
Ratio of CH 3 as to CH 2 as 0.4849 0.4909 0.00603
1 SEM = pooled standard error of means; Means with the different letter within the same row are
significantly different (P < 0.05).
2
Peak centers for the CH 3 -antisymmetric, CH 2 -antisymmetric were ca. 2957 cm -1 , 2926 cm -1 ,
respectively and baseline ca. 3021-2800 cm -1 for the all CH groups.
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