JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Wenjing Hu,Yuting Zhang,Ying Zhou,Yan Zhang,Shuguang Han
Due to the high mean degree of polymerization (mDP) of condensed tannins, condensed tannin-based adhesives have high viscosity, poor water resistance, and low shear strength, and thus are limited in their application. Degradation of tannins to reduce its mDP is a feasible method to solve the above problems. In this study, photocatalytic degradation of larch tannins (LT) was carried out to obtain LT with different mDP. Larch tannin-formaldehyde (LT-F) adhesives were prepared with different mass ratios of F to LT, and then used to prepare plywood with poplar veneer. The effect of different mDP of LT and different mass ratios of F to LT on the properties of the LT-F adhesives were explored. The results showed that LT with different mDP could be obtained by photodegradation. When the photodegradation time was 6 h (LT6, with mDP 3.71), and the mass ratio of F to LT6 was 10 %, the LT6–10 %F adhesives had low viscosity, good water resistance, and high shear strength that exceeded the requirements of the Chinese national standard (GB/T9846–2015, ≥ 0.70 MPa). The formaldehyde emission was 0.15 mg/L, lower than poplar veneer (0.23 mg/L). Therefore, LT6–10 %F adhesives can still be safely used in wood industry although formaldehyde is used.
研究领域:
林产化学与技术
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Qingxuan Yin,Shumin Wang,Haoyu Deng,Junyou Shi,Dan Zhang,Wenbiao Xu
Understanding the structural diversity of lignin is crucial for its efficient conversion into high-value aromatic compounds. However, the impact of lignin's structural characteristics from artificial forests on catalytic depolymerization is not well understood. This study investigates the structural differences in lignin from larch trees of varying ages (10, 20, and 40 years) and anatomical parts (heartwood, sapwood, canopy, bark) to understand how these variations influence catalytic depolymerization. Polyoxometalates (POMs) were selected as catalysts due to their high efficiency in facilitating the conversion of lignin into valuable chemical products. By utilizing POMs for catalytic oxidation, we explore the relationship between lignin structure and depolymerized products, providing insights into the structural features of larch lignin. Our findings reveal that the β-O-4 content of heartwood lignin is as high as 78.7 %, while that of the canopy is lower at 67.1 %. Additionally, the unique lignin structure significantly impacted the yield and selectivity of aromatic monomers, with the highest monomer yield from heartwood lignin reaching 15.64 %, compared to the lowest yield of 7.46 % from canopy lignin. These results lay a theoretical foundation for developing efficient biomass conversion technologies and offer novel strategies for sustainable biomass utilization and environmentally friendly production.
研究领域:
林学
·
生物质化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2018
·
IF 4.513
Zaizhi Liu,Huiyan Gu,Lei Yang
An ionic liquid-based homogenate-ultrasound-synergistic technique was proposed to simultaneously extract dihydroquercetin and arabinogalactan from Larix gmelinii stumps. The appropriate extraction solvent of [C 2 mim]Br was screened from thirteen kinds of imidazolium-based ionic liquids. The optimal conditions for the proposed method obtained by response surface methodology were a [C 2 mim]Br concentration of 0.87 mol/L, IL-HUSE time of 24 min, liquid/solid ratio of 14 mL/g, and ultrasound power of 240 W. Under these conditions, the satisfied extraction yields were 53.09 ± 2.24 mg/g for dihydroquercetin and 152.48 ± 5.78 mg/g for larch arabinogalactan. Validation studies suggested that the improved method was capable of extraction of dihydroquercetin and arabinogalactan from L. gmelinii stumps. High extraction yields of dihydroquercetin and arabinogalactan obtained from the recycled [C 2 mim]Br indicated that the proposed method is a highly efficient technique. The present research indicates that the improved process shows promising prospects for application to the preparation of bioactive substances from plant materials.
研究领域:
植物化学
·
天然产物开发
✓ 已验证
DOI
高影响因子
FOOD AND CHEMICAL TOXICOLOGY
·
2021
·
IF 6.025
Yonggan Sun,Jielun Hu,Shanshan Zhang,Huijun He,Qixing Nie,Yanli Zhang,Chunhua Chen,Fang Geng,Shaoping Nie
Background and objectives Dietary fibers have beneficial effects on human health through the interaction with gut microbiota . Larch wood arabinogalactan (LA-AG) is one kind of complex soluble dietary fibers that may be utilized by human gut microbiota. Methods and results In this study, the LA-AG degradation by gut microbiota were characterized by investigating the change of LA-AG, microbiota composition, and the production of short-chain fatty acids (SCFAs), lactic acid, succinic acid , as well as volatile organic metabolites. During the fermentation, pH decreased continuously, along with the organic acids (especially acetic acid and lactic acid) accumulating. LA-AG was degraded by gut microbiota then some beneficial metabolites were produced. In addition, LA-AG inhibited the proliferation of some gut microbiota ( Unclassified_Enterobacteriaceae and Citrobacter ) and the accumulation of some metabolites (Sulfide and indole) released by gut microbiota. Conclusion LA-AG was partly fermentable fibers with prebiotic potential for human gut health.
研究领域:
微生物学
·
营养学
·
代谢组学
·
胃肠病学
✓ 已验证
DOI
PubMed
高影响因子
Phytochemistry Letters
·
2016
·
IF 1.353
Yangyang Xiao,Haihui Xie,Li Zhao,Ping Gou
Two new acyl flavone glucosides, luteolin-4⿲- O -(6- p -hydroxybenzoyl)-β- d -glucopyranoside (leontopodioside A, 1 ) and luteolin-4⿲- O -[6-(2-methylbutyryl)]-β- d -glucopyranoside (leontopodioside B, 2 ), and a new acyl lignan glucoside, lariciresinol-9-angeloyl-4- O -β- d -glucopyranoside (leontopodioside C, 3 ) were isolated from the whole plants of Leontopodium leontopodioides (Asteraceae). Their structures were determined by spectroscopic and chemical methods. Compounds 1 ⿿ 3 exhibited α-glucosidase inhibitory activity with the half maximal inhibitory concentration (IC 50 ) values of 55.6, 39.7, and 474.9 μM, respectively, in comparison with acarbose (626.3 μM).
研究领域:
药用植物学
·
天然产物化学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF FOOD BIOCHEMISTRY
·
2018
·Vol. 42
·期 5
·e12607
·
IF 1.552
Zaizhi Liu,Mengxia Wei,Guoqiang Cui,Xinyu Yang,Huiyan Gu,Lei Yang
Double experimental designs, Plackett–Burman design coupled with Box–Behnken design, were used to optimize the simultaneous extraction process of arabinogalactan and taxifolin from Larix gmelinii by ultrasonic microwave synergistic extraction (UMSE) method. The optimal extraction conditions were determined with the extraction yields of 223.40 ± 7.82 mg/g for larch arabinogalactan and 125.02 ± 5.30 mg/g for taxifolin. Compared to conventional methods, UMSE method showed the merits of higher extraction efficiency, saving time, and energy. The molar ratio of galactose to arabinose is found to be 6:1 through the monosaccharide composition analysis of larch arabinogalactan. The obtained taxifolin structure was identified by mass spectrometry, Fourier transform infrared spectroscopy, and nuclear magnetic resonance. Interestingly, larch arabinogalactan and taxifolin showed completely opposite influences on α-amylase, α-glycosidase, and pancreatic lipase; it was inferred that larch arabinogalactan could act as an inhibitor while taxifolin as an accelerator. Practical applications In this study, response surface methodology of Plackett–Burman design and Box–Behnken design performed well to obtain the optimal conditions and satisfactory extraction yields for the extraction of arabinogalactan and taxifolin from Larix gmelinii by ultrasonic microwave synergistic extraction method, which could be a good paradigm for the efficient isolation of bioactive substances from plant matrix in the field of separation science. Meanwhile, the results from the evaluation of the effects of two target compounds on activities of α-amylase, α-glycosidase, and pancreatic lipase in vitro revealed that larch arabinogalactan and taxifolin enjoyed the completely opposite influences on the three digestive enzymes, namely larch arabinogalactan could act as an inhibitor while taxifolin an accelerator. These results will facilitate the application of larch arabinogalactan and taxifolin in the food and pharmaceutical industries.
研究领域:
植物化学
·
食品科学
·
药理学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）