FTIR spectroscopy and color change of wood for assessment and monitoring of softwood degradation by white-rot fungus Porodaedalea pini

Abstract

Picea jezoensis wood block was degraded by a white-rot fungus (Porodaedalea pini) under laboratory condition for different periods up to 120 days. Chemical composition changes of the wood caused by white-rot fungus degradation were evaluated by Fourier Transform infrared (FTIR) spectroscopy. Additionally, discoloration of the wood meal was analyzed using colorimeter by calculating CIELab values. The results showed that the constant value in the relative changes of lignin and carbohydrates band ratio, indicating that P. pini degrades lignin and carbohydrates nonselectively, with a slight preference for lignin. Fungus degradation of wood resulted in rapid color changes (L* value) that correlate well with degradation of lignin. This study also showed that FTIR spectroscopy is a very simple and fast method fore valuating wood degradation.

Physical and Mechanical Properties of Biodegradable Pot Derived from Oil Palm Empty Fruit Bunch and Sodium Alginate

“…The absorption bands at 1168 and 1166 cm -1 indicated the presence of C-O-C stretching vibration in cellulose and alginate. Similarly, the bands at 820 and 817 cm -1 showed a C-H deformation of the β- (1,4) glycosidic linkage in cellulose, as well as a C-H deformation of the linkage in alginate [30,33].…”

“…Colorimetric analysis was carried out to see the difference in the color and appearance of each biopots, as done in several studies [29,30]. Color values were expressed in lightness (L), redness (a), and yellowness (b) measured using a colorimeter.…”

Characterization of microcrystalline cellulose from fast-growing species Artocarpus elasticus

“…For example, the area of 3400-2900 cm -1 is typical for stretching O-H group and C-H. Table 1 shows the holocellulose absorption at a wave number of 1512.19 cm -1, which features the stretching vibration of C=C, indicating lignin compounds. In addition, wave number vibration 1735.93 cm -1 also appeared because of the amorphous parts (Sunardi et al, 2018).…”

“…Nelson and O'Connor method was used to determine the Total Crystallinity Index (TCI). This refers to the ratio of absorbance in wave number of 1373-1375 cm -1 indicating -O-functional group, and also 2800-2900 cm -1 for C-H and CH2 (A1373/A2800) stretching (Nelson & O'Connor, 1964;Sunardi et al, 2018). Table 3 shows the TCI value of MCC.…”