| Autor: |
Oktaviani, Oktaviani, Yunus, Ade Lestari, BIC, Muhamad Yasin Yunus, Rahmaena, Isyie Jeffti, Nuryanthi, Nunung, Syahputra, Akhmad Rasyid, Maryana, Roni, Rahmawati, Rahmawati |
| Předmět: |
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| Zdroj: |
AIP Conference Proceedings; 2024, Vol. 3053 Issue 1, p1-8, 8p |
| Abstrakt: |
In this work, the study of the radical scavenging properties of irradiated lignin, which is recognized as an antioxidant of natural origin, was analyzed. Lignin used in this study was isolated from black liquor. Black liquor is generally known as a by-product in the delignification of the pretreatment process of Oil Palm Empty Fruit Bunch (OPEFB) biomass for deriving bioethanol second generation. The antioxidant potential of lignin irradiated with gamma source of doses 50 and 75 kGy was examined against 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical in homogeneous conditions using UV-VIS spectrophotometry. The results exhibited that antioxidant activity was higher for irradiated lignin compared to unirradiated lignin. The obtained Inhibition Concentration (IC50) values of 0 (unirradiated), 50 and 75 kGy are 113.03, 74.70, and 33.33 µg/mL respectively. The presence of phenoxy radicals had been confirmed by electron spin resonance (ESR). The radical increment of irradiated lignin prevails by increasing the irradiation dose. The results indicated that irradiation generated chain scission of lignin. Therefore, the higher π-conjugation bonds existed and contributed to the increasing antioxidant activity of lignin. Analysis by using Fourier transform infrared (FTIR) spectrophotometer reveals the presence of conjugated structures appearing at an absorbance band of 1535−1642 cm−1. Thermal properties of both unirradiated and irradiated lignin were also evaluated by using differential scanning calorimetry (DSC). The temperature of the glass transition of lignin increased with the increase of radiation dose. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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