In recent years, lignin and extractives from herbaceous plants and crops are receiving increasing attention for their renewability and large annual biomass stock. It is worth noting that only a few studies deal with the chemical characterization of rice husk, a side product of one of the most important crops with regard to human nutrition. Thus, in this study lignin from rice husk was isolated and characterized. Two different extraction procedures were optimized and tested: acidolysis and alkaline enzymatic (AE). The different lignins isolated were fully characterized by means of gravimetric, chromatographic (GPC), and spectroscopic (31P NMR, 2D-HSQC-NMR) analyses with the aim to compare yields, sample purity, and chemical properties, recognized as key parameters for future development. Notwithstanding the extraction procedure, the results highlighted that rice husk lignin is mainly formed by guaiacyl and p-hydroxyphenyl units. The acidolytic approach showed an appreciable lignin recovery and high purity, whereas the AE lignin sample was found to be rich in residual polysaccharides and oxidized functionalities. Moreover, different rice husk extracts, along with acidolysis lignin and AE lignin specimens, were assayed for their antioxidant activity by means of a DPPH radical scavenging test.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1021/jf102188k | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
The purpose of this study is to examine how co-pyrolysis of low-density polyethylene (LDPE) and rice husk is impacted by LDPE. It also looks into the physicochemical characteristics, thermal behavior, and kinetic parameters of these materials. To understand the thermal behavior through TGA, rice husk and LDPE blends in the ratios of LDPE: RH (50:50), LDPE: RH (25:75), and LDPE: RH (75:25) were prepared and tested.
View Article and Find Full Text PDF[Effects of By-products of Co-pyrolysis on Biochar for Benzene Vapor Adsorption Performance].
Huan Jing Ke Xue
January 2025
Department of Environmental Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China.
To explore the effects of the components in the raw materials and by-products of co-pyrolysis on the physicochemical properties of biochar, rice husk （RH, which has a high percentage of lignin and a low content of N） and sawdust （SD, which has a high percentage of both cellulose and N） were used as typical raw materials to prepare co-pyrolysis biochar. The benzene vapor adsorption performance of the obtained biochar was then tested on a fixed-bed device. At the same time, the by-product components generated during pyrolysis were analyzed using thermogravimetric （TG）, scanning electron microscopy （SEM）, and gas chromatography-mass spectrometry （GC-MS）.
View Article and Find Full Text PDFSaccharification and co-fermentation of lignocellulosic biomass by a cockroach-gut bacterial symbiont and yeast cocktail for bioethanol production.
BMC Biotechnol
December 2024
Environmental Microbiology and Biotechnology Unit, Department of Microbiology, Faculty of Biological Sciences, University of Calabar, Calabar, Nigeria.
Background: The eco-friendly transformation of agro-industrial wastes through microbial bioconversion could address sustainability challenges in line with the United Nations' Sustainable Development Goals. The bulk of agro-industrial waste consists of lignocellulosic materials with fermentable sugars, predominantly cellulose and hemicellulose. A number of pretreatment options have been employed for material saccharification toward successful fermentation into second-generation bioethanol.
View Article and Find Full Text PDFMechanical properties of soil reinforced by fiber and alkaline-activated rice husk ash, and rainfall erosion model tests.
Sci Total Environ
December 2024
Guangzhou Municipal Construction Group Co., Ltd., Guangzhou, China.
Rice husk ash is an industrial waste produced by biomass power plant to generate electricity, which contains a lot of silica. The accumulation of rice husk ash not only consumes land resources, but also causes environmental pollution. It is an urgent problem to explore the resource utilization of rice husk ash.
View Article and Find Full Text PDFFormation of alginate gel stabilized silica nanoparticles for encapsulation and topical delivery of minoxidil.
Colloids Surf B Biointerfaces
December 2024
Department of Chemistry, University of Gujrat, Gujrat 50700, Pakistan; State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun 130022, PR China. Electronic address:
Silica nanoparticles-embedded smart-gels are efficient drug carrier systems due to their structural flexibility, high porosity, and ease of formulation development. Herein, the extent of interaction of minoxidil (MXD), a potent vasodilator prodrug, with silica nanoparticles (SiNPs) and alginate (ALG) was investigated. The SiNPs were prepared by extracting silica from rice husk ash, and these SiNPs were further used to prepare MXD-loaded-SiNPs (MXD-SiNPs) by loading them with an appropriate amount of MXD.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!