Biomass Conversion and Biorefinery
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2022
·Vol. 14
·期 4
·5295-5304
·
IF 4.05
Tong Dongshen,Chen Xingtao,Dong Yuxiao,Fang Zhi,Zhang Hao,Zhou Chunhui,Yu Weihua
Kaolinite is a layered silicate material with a Janus character and has been directly used as the solid catalyst for the hydrolysis of cellulose in our previous work. Reducing sugar (RS) is one of the most important intermediates for the utilization of cellulose. In the present study, metal ions dispersed on kaolinite was easily prepared and further evaluated for the hydrolysis of cellulose to RS in water. The metal ions dispersed kaolinite was characterized by XRD, BET, SEM(EDS), and XPS. The catalytic results showed that copper was the best co-catalyst among the tested metal ions and the kaolinite treated with 4(wt)% copper nitrate by calcination at 623 K showed the highest total reducing sugar (TRS) yield of 51% under 478 K with the mass ratio of catalyst to cellulose of 0.2 and weight ratio of water to cellulose of 7 for 3 h. Moreover, the catalyst could be easily regenerated by calcination and the yield of TRS on the regenerated catalyst decreased from 51 to 43.2% after four times reuse. The characterization results revealed that copper was highly dispersed on the outer SiO 4 tetrahedral layer. The surface cuprous species were the active sites and could make the C-O bond cleavage easily by attacking the positively charged carbon atoms of the β-(1,4)-glycosidic linkage in the cellulose. The leaching of the cuprous species was responsible for the deactivation of the catalyst. The copper dispersed kaolinite is the efficient catalyst for the hydrolysis cellulose to reducing sugars and worth further development. Graphical abstract
研究领域:
催化
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材料科学
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环境化学
·
绿色化学
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高分子科学
✓ 已验证
DOI
高影响因子
MOLECULES
·
2019
·Vol. 24
·期 9
·1832
·
IF 3.06
Yang Zhou,Miao Yang,Dongshen Tong,Haiyan Yang,Kai Fang
An effective and friendly method was developed for the production of reducing sugars (RS) from the hydrolysis of cellulose over the solid catalyst of Ca-montmorillonite (Mt) grafted by non-acidic ionic liquid (Mt-IL) in water. The effect of mass ratio, water dosage, reaction temperature, and time were investigated in a batch reactor. Raw Mt showed only a 7.9% total reducing sugars (TRS) yield for the catalytic hydrolysis of cellulose in water. As the Mt was grafted by -SO3H and IL, the TRS yield greatly increased under the same reaction conditions. The highest TRS yield of 35.7% was obtained on the catalyst of Mt grafted by non-acidic IL at 200 °C with the mass ratio of catalyst to cellulose of 0.2 for 120 min. The high TRS yield for Mt-IL should be attributed to the synergistic effect of the dissolution of cellulose by IL and the exposed metal ions on the layer with water. Although the yield of TRS on Mt-IL decreased gradually with recycling runs, the decrease after the first run was not very serious compared to the fresh catalyst. This work provides a promising strategy for efficient cellulose hydrolysis into fine chemicals by Mt with non-acidic IL.Keywords:montmorillonite;ionic liquid;cellulose;hydrolysis;reducing sugars
研究领域:
生物化学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
·
2022
·
IF 6.056
Qiu-Lan Liu,Yang Yi,Shi-Qi Wang,Hong-Xun Wang,Wei Xu,Ting Min,Li-Mei Wang
Lotus root is the most consumed aquatic vegetable in China. Both the actual boiling of lotus root and the simulated boiling of its extract were performed at different conditions to explore the development of non-enzymatic browning and the loss of reducing sugars, free amino acids, total free phenols and ascorbic acid. The kinetic parameters of zero-order and first-order models indicated that both browning degree and nutrient loss had a positive correlation with boiling time, temperature and pH value. Moreover, nutrient contents and boiling conditions were adopted as independent variables to establish the multiple linear regression model of browning degree ( P < 0.001), which confirmed that reducing sugars and total phenols principally contributed to the browning ( P < 0.01), through caramelization and phenol oxidation. With the addition of baking soda (pH 8), 100 °C boiling decreased the DPPH radical scavenging capacity and ferric reducing antioxidant power of lotus root extract by 62.96% and 58.51%, respectively. Furthermore, 120 °C boiling probably induced the formation of browning products, which possessed cytotoxicity against HepG2 and L02 cells. A short boiling time, as well as an acidic condition induced by added vinegar, is recommended for cooking and processing of lotus root in consideration of nutrition and health.
研究领域:
食品科学
·
植物学
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS LETTERS
·
2021
·Vol. 151
·期 10
·2797-2806
·
IF 3.186
Dong Yuxiao,Tong Dongshen,Ren Laibin,Chen Xingtao,Zhang Hao,Yu Weihua,Zhou Chunhui
Abstract Kaolinite, a natural, layered phyllosilicate, has been used as the solid catalyst for the hydrolysis of cellulose in our previous work. In the present study, kaolinite was activated by mineral acid and further evaluated for the hydrolysis of cellulose in water. The acid-activated kaolinite was characterized by XRF, XRD, FT-IR, BET and TG. The effects of reaction temperature, reaction time, mass ratio and water amount were investigated in the system. It was found that the highest total reducing sugars (TRS) yield of 50.2% was obtained on the kaolinite activated by 20% HNO 3 with the mass ratio of catalyst to cellulose of 0.2 and water to cellulose of 14 at 205 ℃ for 3 h. Moreover, the catalyst was easily regenerated by calcination and the yield of TRS on the regenerated catalyst changed between 50.2% and 45.2% after four times reuse. The results showed that the acid activation could influence the crystallinity and improve the specific surface area, but the high TRS yield of the activated kaolinite should be ascribed to the increasing of the interlayer Al–OH groups and the formation of inner hydrogen bonds between the octahedral sheets and tetrahedral sheets. Finally, it was suggested that this was the effective way for improving the catalytic performance by increasing the interlayer Al–OH groups on the kaolinite catalyst. Graphic Abstract
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
MOLECULES
·
2022
·Vol. 27
·期 10
·3149
·
IF 4.927
Xingtao Chen,Dongshen Tong,Zhi Fang,Zhenpeng Gao,Weihua Yu
Vermiculite is a natural mineral. In this study, vermiculite and acid-activated vermiculite was used as a solid acid catalyst for the hydrolysis of cellulose in water. The catalysts were characterized by XRD, FT-IR, and BET. The effects of time, temperature, mass ratio and water amount on the reaction were investigated in the batch reactor. The results showed that the highest total reducing sugars (TRS) yield of 40.1% could be obtained on the vermiculite activated by 35 (wt)% H2SO4with the mass ratio of catalyst to cellulose of 0.18 and water to cellulose of 16 at 478 K for 3.5 h. The acid-activated vermiculite was a stable catalyst through calcination at 628 K and the yield of TRS decreased to 36.2% after three times reuse. The results showed that the crystal structure of vermiculite was destroyed and the surface -OH groups increased after the acid treatment. However, the synergistic effect of a strongly electrostatic polarization and Brönsted acid was responsible for the efficient conversion of cellulose. The mechanism of cellulose hydrolysis on the acid-activated vermiculite was suggested. This work provides a promising strategy to design an efficient solid catalyst for the cellulose hydrolysis, and expands the use of vermiculite in a new field.
研究领域:
化学工程
·
可再生资源
✓ 已验证
DOI
高影响因子
FUEL
·
2015
·
IF 3.52
Xianxiang Liu,Qiong Xu,Junyi Liu,Dulin Yin,Shengpei Su,Hui Ding
An effective method was developed for the production of reducing sugars (RS) from the hydrolysis of cellulose over a magnetic acid catalyst. The sulfonation of the core–shell structured Fe 3 O 4 @C with Fe 3 O 4 as a magnetic core could generate the magnetic acid catalyst (Fe 3 O 4 @C-SO 3 H). The hydrolysis of cellulose was performed under several crucial conditions. Hydrolysis of cellulose in ionic liquid 1-butyl-3-methyl imidazolium chloride ([BMIM]Cl) was greatly affected by the content of water. The highest RS yield and glucose selectivity were obtained in 72.1% and 82.5% at 110 °C after 3 h with the weight ratio of [BMIM]Cl to water being 20. It should be mentioned that this catalyst not only owns the high stability but also can be facile recovered by an external magnet.
研究领域:
生物化学
·
可再生资源工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CEREAL SCIENCE
·
2017
·
IF 2.223
Zicong Zeng,Yuting Li,Rong Yang,Chengmei Liu,Xiuting Hu,Shunjing Luo,Ersheng Gong,Jiangping Ye
To investigate the relationship between reducing sugars and phenolic retention of brown rice after enzymatic extrusion, reducing sugars, total phenolic content, total antioxidant activity , and individual phenolic acids of brown rice extruded with different α-amylase concentrations (0.1%, 0.5%, 1%, w/w) were evaluated. Reducing sugars were produced during enzymatic extrusion and significantly increased with the increasing enzyme concentration. Compared with traditional extrusion, the enzymatic extrusion with 1% amylase significantly increased the phenolic retention, DPPH value, FRAP value, and ABTS value by 22.4%, 19.5%, 14.7%, and 41.5%, respectively. The retention of most free phenolic acids was also increased with the increasing enzyme concentration. Besides, the correlation analysis indicated that the content of reducing sugars was positively correlated with total phenolic content (r = 0.915), DPPH value (r = 0.882), FRAP value (r = 0.861), ABTS value (r = 0.867) and free individual phenolic acids (r = 0.595–0.943) of treated brown rice. These results suggested that reducing sugars might protect phenolic compounds during enzymatic extrusion.
研究领域:
食品科学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2023
·
IF 8.8
Dong Chen,Menglong Sheng,Silu Wang,Xiuhan Chen,Aoxue Leng,Songyi Lin
The dynamic variations in key contributing odorants, amino acids and reducing sugars in shiitake mushrooms during hot-air drying were determined by gas chromatography-mass spectrometry (GC-MS), high performance liquid chromatography-tandem mass (HPLC-MS/MS) and ion chromatography (IC). The potential precursors were explored by the partial least squares-discriminant analysis and Pearson correlation analysis, and Met, Cys, and ribose were considered as the possible precursors of dimethyl trisulfide and lenthionine. The verification experiments in the absence and presence of shiitake mushroom matrix further confirmed that Met and its interaction with ribose both contributed to generating dimethyl trisulfide. The polynomial nonlinear fitting curve could better represent the dose-effect relationships of Met and Met-ribose to produce dimethyl trisulfide with R 2 of 0.9579 and 0.9957. Conversely, ribose, Cys or Cys-ribose were verified to be unable to form the key contributing odorants. Collectively, the results provided a method to reveal precursors and generation pathway of odorants.
研究领域:
食品科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Bioresource Technology Reports
·
2019
·
IF 0
Yingxue Gong,Zhibin Fu,Menglian Liu,Yu Dai,Jianghai Lin,Zehuan Liu
The alkalis sodium ethoxide and calcium hydroxide were combined to pretreat the abundant agricultural waste sugarcane leaf (SCL). The pretreatment conditions were optimized using single factors and orthogonal array, and the results of material's chemical compositions and enzymatic hydrolysis were investigated. The optimized conditions were pretreating SCL with C 2 H 5 ONa:Ca(OH) 2 volume ratio of 4:1 at 121 °C for 30 min. Under these conditions, the lignin removal rate of SCL was 86.26%, while the total reducing sugars and total enzymatic efficiency of enzymatic hydrolysis could reach 14.82 g/L and 80.02% respectively. These pretreating and hydrolysis results were similar compared with those of SCL pretreated with strong base C 2 H 5 ONa alone. But the strong base dosage was saved 20% and the pretreatment time was shortened to 30 min. Therefore the combined alkali pretreatment could significantly save energy and reduce environmental pollution, which made it a promising method in large-scale production.
研究领域:
生物能源
·
农业废弃物利用
·
生物质转化
✓ 已验证
DOI
POLYMER DEGRADATION AND STABILITY
·
2011
·
IF 2.594
Qin Chen,Wenjun Xiao,Lilong Zhou,Tinghua Wu,Ying Wu
Hydrolysis of chitosan in ionic liquids was carried out under microwave irradiation (MW) using sulfonic acid-functionalized ionic liquids (SFILs) as catalysts. The effect of microwave power, irradiation time, dosage of SFILs and DMSO was investigated by orthogonal tests. Under the optimal reaction conditions, the yield of total reducing sugars (TRS) reached over 90% within 2 min. The viscosity-average molecular weight of degraded chitosan was determined by viscosity method. The structures of the original and degraded chitosan were characterized by Fourier-transform infrared (FTIR) spectra, X-ray powder diffraction (XRD) analysis and carbon-13 nuclear magnetic resonance spectroscopy ( 13 C NMR). The influence of microwave power and irradiation time on the TRS and M v was further studied. This method can dramatically reduce reaction time.
研究领域:
生物化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 21
·11714-11724
·
IF 2.936
Peng Lu,Yong Cao,Xiaolan Wang
A novel catalytic membrane was prepared from polysulfone powders covalently linked with acidic ionic liquids (PSF-ILs), as a heterogeneous catalyst to produce reducing sugar for biomass inulin hydrolysis in a catalytic membrane reactor. However, a complete kinetic model describing the relationship between catalyst physical properties and hydrolysis performance is lacking. The present work attempts to build a hydrolysis kinetic model for the relationship between the conversion and the structure of the PSF-ILs membrane (such as membrane thickness, pore size, porosity and specific surface area). The reaction parameters, such as the reaction time, reaction temperature as well as the nature of the catalyst were of crucial importance in terms of optimal conversion of the biomass inulin to reducing sugar or platform chemicals. The results showed that the structure of the PSF-ILs membrane has a significant effect on its catalytic performance. The PSF-ILs membrane with the best catalytic performance was selected and the maximum TRS yields were up to 100% after two rounds of inulin hydrolysis. The conversions obtained from the established model are in good agreement with the experimental data. Understanding the structure–property relationship of the PSF-ILs membrane will be helpful in designing the physical structure of the membrane to improve its catalytic activity and reusability. Therefore, it is a type of green catalyst with potential application prospects in many catalysis fields.
研究领域:
生物化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CLAY SCIENCE
·
2020
·
IF 4.605
Haiyan Yang,Dongshen Tong,Yuxiao Dong,Laibin Ren,Kai Fang,Chunhui Zhou,Weihua Yu
Kaolinite , a natural, abundant, low cost, and eco-friendly material, has been widely used as filler, additives, adsorbent and coatings. In the study, kaolinite was evaluated for the performance of the hydrolysis of cellulose in water. The effects of mass ratio, reaction temperature, reaction time and water amount were investigated in a batch reactor. The fresh and regenerated catalysts were characterized by XRD , FT-IR and TG-DTG. The catalytic results showed that the highest TRS yield of 38.8% was obtained on the kaolinite at 200 °C with the mass ratio of catalyst to cellulose of 0.2 for 3 h. Moreover, kaolinite was a stable catalyst after regeneration and the yield of TRS decreased from 38.8% to 38.1% after five times reuse. Kaolinite contains abundant surface Al-OH groups, and the high TRS yield for kaolinite should be attributed to the H + ions released from the surface OH groups. This work provides a promising strategy for efficient cellulose hydrolysis into fine chemicals by natural clay minerals.
研究领域:
生物化学
·
可再生资源与环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）