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3.5 การก FTIR ของฟิล์มFTIR spectra of biocomposite films in the presence of essentialoil are depicted in Fig. 2. Generally, FTIR spectra of control filmand films including essential oil indicated same major peaks butthe amplitudes of peaks differed, depending on the amount of oiladded. All films exhibited the characteristic broad absorption band about 3327 cm−1and the intense peak about 2933 cm−1, which are attributed to the stretching vibration of hydroxyl (O H) groups and aliphatic C H in CH3groups, respectively (Altiok et al., 2010).The characteristic bands of the control film (Fig. 2a) at approx-imately 1651, 1546, and 1245 cm−1are assigned to the amide-I(C O stretching), amide-II (N H bending) and amide-III (C N andN H stretching), respectively (Liu et al., 2012). Peaks at 1409and 1152 cm−1were assigned to OH groups and pyranose rings,respectively (Liu et al., 2012). The band located at the wavenumber of 1042–1045 cm−1was appeared in all films, matching to theOH group, chiefly from glycerol added as a plasticizer (Hoque et al.,2010). After incorporation of oregano oil some of the peaks were shifted to lower and higher wavenumbers (Fig. 2b–d). For example,the amide-I peak has shifted from 1651 (control film) to 1646, 1647,and 1636 cm−1in 0.4, 0.8, and 1.2% (w/v) OEO-incorporated films,respectively. The shifts of amide-I peak to lower wavenumber ofoil-incorporated films were correlated with a decrease in molecular order because of conformational change (Altiok et al., 2010).Meanwhile, the amplitude of peaks at wavenumbers 1409 cm−1and 1245 cm−1has increased when the films had been added with essential oil. Ahmad et al. (2012) found that the peak amide-I and
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