ENERGY
·
2018
·
IF 4.968
Xue-Feng Shao,Chao Wang,Yong-Jian Yang,Biao Feng,Zi-Qin Zhu,Wu-Jun Wang,Yi Zeng,Li-Wu Fan
Towards latent heat storage in the low-to-medium temperature range (70–250 °C), screening of sugar alcohols and their binary eutectic mixtures as potential phase change materials was carried out by focusing on the non-isothermal melting and crystallization behaviors. A preliminary screening shortened the long list of isomers from common four-carbon to six-carbon sugar alcohols to only six affordable candidates, i.e., xylitol, d-sorbitol, erythritol, d-mannitol, d-dulcitol and inositol (ordered with increasing the melting point). Based on the six pre-screened sugar alcohols, a total of 15 binary eutectic mixtures were prepared to manipulate the melting points for more flexible match with real applications. Non-isothermal tests were then performed on a differential scanning calorimeter at various ramping/cooling rates up to 10 °C/min. In addition to determination of the melting point and latent heat of fusion, a special attention was paid to the crystallization behaviors by undertaking consecutive melting-crystallization cyclic tests. It was found that the two candidates with the lowest melting points (both below 100 °C), i.e., xylitol and d-sorbitol, as well as the nine binary eutectic mixtures containing at least one of them, are unable to crystallize from the melt during cool-down at any cooling rates tested (down to 0.5 °C/min). Four other binary eutectic mixtures, i.e., erythritol (84 mol%) + d-mannitol, erythritol (95 mol%) + d-dulcitol, erythritol (96 mol%) + inositol and d-dulcitol (69 mol%) + inositol, were also shown to be unable to crystallize upon cooling, with the crystallization occurring during the reheating process instead, referred to as cold crystallization. The rest four pure sugar alcohols with relatively high melting points (110–230 °C), i.e., erythritol, d-mannitol, d-dulcitol, inositol, and two mixtures, i.e., d-mannitol (70 mol%) + d-dulcitol and d-mannitol (82 mol%) +inositol, were found to be able to crystallize upon cooling, although they all suffer from severe supercooling (e.g., up to over 100 °C for erythritol). The affordable pure and mixture sugar alcohols were deemed to have desirably high latent heat storage density, especially for those with higher melting points. However, they all face specific issues associated with crystallization, which must be addressed before they can really be utilized in real applications. In addition, it may not worth making eutectic mixtures, although this is deemed to be an effective way of manipulating the melting points of sugar alcohols.
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APPLIED ORGANOMETALLIC CHEMISTRY
·
2025
·Vol. 39
·期 2
·e7957
·
IF 0
Yuzhang Yang,Minji Li,Yunqian Gong,Xingliang Li,Jia Zhou,Qinping Wei,Junke Zhang
Enzyme mimics attract wide attentions as detection sensors. However, the widespread application is limited by low efficiency and high cost. Herein, two novel enzyme mimics 1 and 2 were developed with peroxidase-like activities. The chain-like structure of 1 exhibited better stability, energy transformation efficiency, and catalytic property than 2 . Both of them could generate •OH radicals to oxide chromogenic agents, realizing the colorimetric detection of H 2 O 2 . Additionally, under the synergy of glucose oxidase, a cascade strategy for detection of glucose was constructed. This method exhibited excellent selectivity, anti-interference, and storage performance, as well as a wide linear range (1–60 μM) at pH = 7.4, with the low detection limits of 0.095 and 0.061 μM for 1 and 2 , respectively. Furthermore, the strategy was applied for detecting glucose in apple fruit samples. This work overcomes the shortcomings of current enzyme mimics and paves the way for bioanalysis and agricultural applications.
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Biotechnology for Biofuels
·
2012
·Vol. 5
·期 1
·1-12
·
IF 6.088
Xu Ning,Zhang Wei,Ren Shuangfeng,Liu Fei,Zhao Chunqiao,Liao Haofeng,Xu Zhengdan,Huang Jiangfeng,Li Qing,Tu Yuanyuan,Yu Bin,Wang Yanting,Jiang Jianxiong,Qin Jingping,Peng Liangcai
Background Lignocellulose is the most abundant biomass on earth. However, biomass recalcitrance has become a major factor affecting biofuel production. Although cellulose crystallinity significantly influences biomass saccharification, little is known about the impact of three major wall polymers on cellulose crystallization. In this study, we selected six typical pairs of Miscanthus samples that presented different cell wall compositions, and then compared their cellulose crystallinity and biomass digestibility after various chemical pretreatments. Results A Miscanthus sample with a high hemicelluloses level was determined to have a relatively low cellulose crystallinity index (CrI) and enhanced biomass digestibility at similar rates after pretreatments of NaOH and H 2 SO 4 with three concentrations. By contrast, a Miscanthus sample with a high cellulose or lignin level showed increased CrI and low biomass saccharification, particularly after H 2 SO 4 pretreatment. Correlation analysis revealed that the cellulose CrI negatively affected biomass digestion. Increased hemicelluloses level by 25% or decreased cellulose and lignin contents by 31% and 37% were also found to result in increased hexose yields by 1.3-times to 2.2-times released from enzymatic hydrolysis after NaOH or H 2 SO 4 pretreatments. The findings indicated that hemicelluloses were the dominant and positive factor, whereas cellulose and lignin had synergistic and negative effects on biomass digestibility. Conclusions Using six pairs of Miscanthus samples with different cell wall compositions, hemicelluloses were revealed to be the dominant factor that positively determined biomass digestibility after pretreatments with NaOH or H 2 SO 4 by negatively affecting cellulose crystallinity. The results suggested potential approaches to the genetic modifications of bioenergy crops.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2017
·Vol. 134
·期 16
·
IF 1.86
Hui Shi,Xuan Chen,Wenkai Chen,Sujuan Pang,Lisha Pan,Nai Xu,Tan Li
In this work, use of myo -inositol as a biobased nucleating agent (NA) for PLLA was researched. Effects of myo -inositol on non-isothermal and isothermal crystallization behaviors of PLLA at temperatures ranged from 85 °C to 130 °C were studied by using DSC, POM and WAXD. Isothermal crystallization kinetics results showed that the incorporation of myo -inositol enhanced significantly the crystallization rate of the PLLA samples. It was confirmed that the optimum isothermal crystallization temperature range was 100 to 110 °C. The above results were instructive to confirm proper heat treatment time and temperature for compression or injection molding to fabricate highly crystallized PLLA articles. The relations among heat treatment time, crystallinity, heat resistance, and mechanical performances of the neat PLLA and PLLA/1% myo -inositol specimens prepared by compression molding were investigated. Compared with the PLLA specimens, the PLLA/1% myo -inositol specimens showed a shorter heat treatment time to reach the maximum crystallinity. Vicat softening temperature, as well as tensile strength, modulus, and toughness of the PLLA/1% myo -inositol specimens was improved when crystallinity increased from 5.4% to 38.1%. Considering the nontoxicity and biocompatibility of myo -inositol, PLLA/ myo -inositol blends would be potential to prepare some products, which are required higher health standard and can be used in elevated temperature environments. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 44732.
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JOURNAL OF PHARMACY AND PHARMACOLOGY
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2016
·Vol. 68
·期 1
·1-13
·
IF 2.363
Li Jianying,Hu Meina,Xu Huan,Yu Xiu,Ye Feifei,Wang Kaiqian,Luan Xiaojiao,Li Ling,Zhang Di
ObjectivesTo improve stability and shelf life, lyophilized formulations of 20(R)-Ginsenoside Rg3 liposomes (G-Rg3-Ls) were prepared.MethodsGlucose, trehalose, sucrose, maltose, lactose, mannitol, inositol, hydroxypropyl-β-cyclodextrin and polyethylene glycol were used as single lyoprotectant and then compared in terms of their ability to protect lyophilized G-Rg3-Ls. Further, a glucose–mannitol complex was used to determine the optimal lyophilized preparation. The analysis of lyophilized liposomes or lyoprotectant was further investigated by scanning electron microscopy, thermogravimetry-differential thermal analysis, X-ray diffractometry and Fourier transform infrared spectroscopy. Cytotoxicity assay was used to assess the cyto-inhibition of freshly prepared and lyophilized liposomes.Key findingsWhen the ratio of glucose–mannitol to phospholipids was 4 : 2 : 1 (w/w) the lyophilized G-Rg3-Ls exhibited good appearance, high DRR (86.52% ± 5.02%), small change in particle size (45.83 ± 0.50%) and short rehydration reconstruction time (8.3 ± 1.5 s). All indices were considerably better than those of each single protective agent. Results indicated that when the two lyoprotectants were combined, the stabilizing effect of glucose and shaping effect of mannitol were well maintained. The cyto-inhibition of freshly prepared and lyophilized G-Rg3 liposomes showed that lyophilization did not affect the bioactivity of G-Rg3.ConclusionsThe application of glucose–mannitol composite lyoprotectants can obtain a good G-Rg3 lyophilized preparation.
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JOURNAL OF CHEMICAL THERMODYNAMICS
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2017
·
IF 2.726
Rui Jia,Keyan Sun,Rongchun Li,Youyou Zhang,Wenxia Wang,Heng Yin,Dawei Fang,Quan Shi,Zhicheng Tan
In recent years, sugar alcohols have attracted much attention due to their remarkable phase change properties for thermal energy storage applications. The thermodynamic properties especially the heat capacities would play a crucial role in theoretically and technically investigating the energy storage performance for sugar alcohols. However, as far as we known, the heat capacities of sugar alcohols have never been studied in a wide temperature region. In this study, we have measured the heat capacities of six sugar alcohols of D-mannitol, Myo-Inositol, xylitol, D-arabinitol, L-arabinitol and erythritol in the temperature range from T = (1.9 to 550) K for the first time using a combination of Physical Property Measurement System and differential scanning calorimeter. Based on the heat capacity curve fitting, the standard molar heat capacity, entropy and enthalpy at 298.15 K and 0.1 MPa, and melting temperature and transition enthalpy in the solid–liquid phase transition region were consequently obtained for these sugar alcohols. Moreover, the heat capacity and phase transition properties obtained in this work were also compared with previous results reported in literature.
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PLoS One
·
2016
·Vol. 11
·期 8
·e0160026
·
IF 3.057
Xukai Li,Haofeng Liao,Chunfen Fan,Huizhen Hu,Ying Li,Jing Li,Zili Yi,Xiwen Cai,Liangcai Peng,Yuanyuan Tu
Miscanthus is a leading bioenergy candidate for biofuels, and it thus becomes essential to characterize the desire natural Miscanthus germplasm accessions with high biomass saccharification. In this study, total 171 natural Miscanthus accessions were geographically mapped using public database. According to the equation [P(H/L| East) = P(H/L∩East)/P(East)], the probability (P) parameters were calculated on relationships between geographical distributions of Miscanthus accessions in the East of China, and related factors with high(H) or low(L) values including biomass saccahrification under 1% NaOH and 1% H 2 SO 4 pretreatments, lignocellulose features and climate conditions. Based on the maximum P value, a golden cutting line was generated from 42°25’ N, 108°22’ E to 22°58’ N, 116°28’ E on the original locations of Miscanthus accessions with high P(H|East) values (0.800–0.813), indicating that more than 90% Miscanthus accessions were originally located in the East with high biomass saccharification. Furthermore, the averaged insolation showed high P (H|East) and P(East|H) values at 0.782 and 0.754, whereas other climate factors had low P(East|H) values, suggesting that the averaged insolation is unique factor on Miscanthus distributions for biomass saccharification. In terms of cell wall compositions and wall polymer features, both hemicelluloses level and cellulose crystallinity (CrI) of Miscanthus accessions exhibited relative high P values, suggesting that they should be the major factors accounting for geographic distributions of Miscanthus accessions with high biomass digestibility.
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BIORESOURCE TECHNOLOGY
·
2017
·
IF 5.651
Zahoor,Yuanyuan Tu,Lingqiang Wang,Tao Xia,Dan Sun,Shiguang Zhou,Yanting Wang,Ying Li,Heping Zhang,Tong Zhang,Meysam Madadi,Liangcai Peng
In this study, a combined pretreatment was performed in four wheat accessions using steam explosion followed with different concentrations of H 2 SO 4 or NaOH, leading to increased hexoses yields by 3–6 folds from enzymatic hydrolysis. Further co-supplied with 1% Tween-80, Talq90 and Talq16 accessions exhibited an almost complete enzymatic saccharification of steam-exploded (SE) residues after 0.5% H 2 SO 4 or 1% NaOH pretreatment, with the highest bioethanol yields at 18.5%–19.4%, compared with previous reports about wheat bioethanol yields at 11%–17% obtained under relatively strong pretreatment conditions. Furthermore, chemical analysis indicated that much enhanced saccharification in Talq90 and Talq16 may be partially due to their relatively low cellulose CrI and DP values and high hemicellulose Ara and H-monomer levels in raw materials and SE residues. Hence, this study has not only demonstrated a mild pretreatment technology for a complete saccharification, but it has also obtained the high ethanol production in desirable wheat accessions.
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Food Analytical Methods
·
2015
·Vol. 8
·期 10
·2588-2594
·
IF 1.956
Jiang Ting-Fu,Chong Lei,Yue Mei-E,Wang Yuan-Hong,Lv Zhi-Hua
In this study, the separation and determination of carbohydrates in food samples were developed by capillary electrophoresis using dynamically coating the capillary with indirect UV detection. The polycationic polymers of hexadimethrine bromide (HDB) were used as electroosmotic flow (EOF) modifier to reverse the EOF. A highly alkaline pH condition was used in order to charge every carbohydrate negatively. Several important parameters influencing buffer concentration, pH, and HDB concentration were optimized. The optimal background electrolyte composed of 20 mmol L −1 sorbic acid, 0.005 % ( w / v ) HDB, and 40 mmol L −1 NaOH at pH 12.2. Under optimal conditions, 32 carbohydrates including mono-, di-, oligosaccharides, and sugar alcohols were separated in less than 12 min. The proposed method provided a good linearity, low limits of detection, and good repeatability of the carbohydrates. This method was then utilized to analyze carbohydrates in food samples. The results indicated that the developed method is an excellent alternative for the carbohydrate routine analysis in the food field.
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高影响因子
FLUID PHASE EQUILIBRIA
·
2013
·
IF 2.379
Yonghong Hu,Wenbiao Zhi,Mengmeng Liang,Zheng Cao,Wenge Yang
In this paper, we focused on solubility and solution thermodynamics of myo -inositol. By gravimetric method, the solubility of myo -inositol was measured in (water + acetic acid) binary solvent mixtures from 278.15 K to 333.15 K under atmosphere pressure. The solubility data were fitted using modified Apelblat equation, a variant of the combined nearly ideal binary solvent/Redich–Kister (CNIBS/R–K) model and Jouyban–Acree model. The three models were all proven to give good agreement with the experiment data, and modified Apelblat equation was the best. By means of van’t Hoff analysis, the enthalpy, entropy and Gibbs energy were calculated, which indicated that the dissolving process was nonspontaneous.
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高影响因子
BIORESOURCE TECHNOLOGY
·
2017
·
IF 5.651
Dan Sun,Aftab Alam,Yuanyuan Tu,Shiguang Zhou,Yanting Wang,Tao Xia,Jiangfeng Huang,Ying Li,Zahoor,Xiaoyang Wei,Bo Hao,Liangcai Peng
In this study, total ten Miscanthus accessions exhibited diverse cell wall compositions, leading to largely varied hexoses yields at 17%–40% (% cellulose) released from direct enzymatic hydrolysis of steam-exploded (SE) residues. Further supplied with 2% Tween-80 into the enzymatic digestion, the Mis7 accession showed the higher hexose yield by 14.8-fold than that of raw material, whereas the Mis10 had the highest hexoses yield at 77% among ten Miscanthus accessions. Significantly, this study identified four wall polymer features that negatively affect biomass saccharification as p < 0.05 or 0.01 in the SE residues, including cellulose DP, Xyl and Ara of hemicellulose, and S-monomer of lignin. Based on Simons’ stain, the SE porosity (defined by DY/DB) was examined to be the unique positive factor on biomass enzymatic digestion. Hence, this study provides the potential strategy to enhance biomass saccharification using optimal biomass process technology and related genetic breeding in Miscanthus and beyond.
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CARBOHYDRATE POLYMERS
·
2024
·
IF 10.7
Wan-Qi Deng,Shao-Wei Han,Si-Yuan Shao,Shuai Li
Pseudobulbs of Pleione bulbocodioides have been used as traditional Chinese medicine for a long time to treat cancers through decoction with water. However, as its main water-soluble ingredient, the structure of polysaccharide has not been elucidated yet. To obtain its polysaccharide with antitumor activity, a series of isolation, structural identification and antitumor evaluation experiments were performed. As a result, a newly discovered glucomannan, named PBP, was isolated and purified from the pseudobulbs of P. bulbocodioides . The molecular weight of PBP is 1.11 × 10 5 Da. Its monosaccharide composition comprises mannose and glucose at a molar ratio of 5:3. The fine structure of PBP was confirmed as a linear glucomannan backbone primarily comprising repeating →4)-β- d -Glc-(1 → 4)-β- d -Man-(1 → 4)-β- d -Glc-(1 → 4)-β- d -Man-(1 → 4)-β- d -Glc-(1 → 4)-β- d -Man-(1→4)-β- d -Man-(1 → 4)-β- d -Man-(1 → via a combination of analytical techniques and enzymolysis methods. PBP effectively inhibited the growth of 4T1 tumors with low toxicity in vivo . Furthermore, a noteworthy augmentation in the expression levels of CD4+ and CD8+ T cells suggested the existence of an elevated immune response. In summary, a new glucomannan with anti-breast tumor activity was obtained, which has the potential to contribute to breast cancer therapy.
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