BIOTECHNOLOGY LETTERS
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2022
·Vol. 44
·期 4
·623-633
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IF 2.716
Hao Zhi-kui,Li Jian-song,Wang Dan-hua,He Fei,Xue Jing-shi,Yin Liang-hong,Zheng Hua-bao
Objectives Shellfish waste is a primary source for making N -acetyl- d -glucosamine. Thus, establishing a high-efficiency and low-cost bioconversion method to produce N -acetyl- d -glucosamine directly from shellfish waste was promising.
Results A mutant C81 was obtained from Chitinolyticbacter meiyuanensis SYBC-H1 via 60 Co-γ irradiation. This mutant C81 showed the highest chitinase activity of 9.8 U/mL that was 85% higher than the parent strain. The mutant C81 exhibted improved antioxidant activities, including total antioxidant capacity, superoxide radical ability, and hydroxyl radical scavenging ability, compared to that of the parent strain. Four out of nine organic solvents increased the chitinase activity by 1.9%, 6.8%, 11.7%, and 15.8%, corresponding to methylbenzene, n-heptane, petroleum ether, and n-hexane, respectively. The biphase system composed of aqueous and hexane presented a five-fold reduction of cell viability compared to the control. Using a continuous fermentation bioconversion process, 4.2 g/L GlcNAc was produced from crayfish shell powder with a yield of 80% of the chitin content. Conclusions This study demonstrated that the mutant C81 is suitable for converting crayfish shell powder into GlcNAc in an aqueous-organic system.
研究领域:
微生物学
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生物化学
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生物工程
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DOI
PubMed
高影响因子
ADSORPTION SCIENCE & TECHNOLOGY
·
2018
·
IF 0.609
Youzhou Zhou,Liuqin Ge,Neng Fan,Meisheng Xia
Two novel adsorbents derived from shrimp shell were prepared and their adsorption performances on Congo red were investigated. The results suggested that treated shrimp shell powder exhibited a higher adsorption capacity than raw shrimp shell powder. The factors of initial concentration, solution pH, adsorption time, and temperature were investigated. The maximum adsorption capacity of treated shrimp shell powder calculated according to the Langmuir isotherm model was 288.2 mg/g, which is much higher than that of chitin. The adsorption behavior could be fitted well by the pseudo-second-order kinetic model. Intra-particle diffusion model was also used to study the adsorption process. The thermodynamic parameters indicated the spontaneous and endothermic nature of the adsorption. Shrimp shell powder exhibited enough advantages such as large adsorption capacity, low cost, simple processing methods and high specific gravity compared with chitin or chitosan. This work confirmed that the shrimp shell biosorbent had a potential to be applied in dye wastewater treatment area.
研究领域:
环境科学
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生物工程
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材料科学
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化学工程
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水污染控制
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DOI
高影响因子
JOURNAL OF THERMOPLASTIC COMPOSITE MATERIALS
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2019
·
IF 1.343
Hongjuan Zheng,Zhengqian Sun,Hongjuan Zhang
Poly(lactic acid) (PLA) has good environmental compatibility, however, its high brittleness, slow rate of crystallization, and low heat distortion temperature restrict its widespread use. To overcome these limitations, in this study, PLA was mixed with walnut shell (WS) powders. The effects of WS powders on the morphology and the thermal and mechanical properties of PLA were investigated. The products were characterized by differential scanning calorimetry (DSC), infrared (IR) spectroscopy, polarizing optical microscopy (POM), and various mechanical property testing techniques. The results showed that WS powders had a significant effect on the morphology and the thermal and mechanical properties of PLA. The tensile strength, impact strength, and elongation at break of the PLA/WS composites first increased and then decreased with the increasing addition of WS powders. When the addition of WS powders was about 0.5 wt%, they reached maximum values of 51.2 MPa, 23.3 MPa, and 19.0%, respectively. Compared with neat PLA, the spherulite grain size of the composites could be reduced and many irregular polygons were formed during crystallization. The melting, cold crystallization, and glass-transition temperatures of the composites were lower than those of neat PLA.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
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2022
·
IF 7.693
Xing Cao,Ruiqi Zhang,Ning Zhang,Lei Chen,Dongming Chen,Xuebing Li
Organic phase change materials (PCMs) such as fatty acids and fatty alcohols are often trapped by inherent low thermal conductivity for thermal energy storage in buildings. The present study is devoted to ameliorating this problem from an innovative perspective of introducing bio-sourced additive. To promote performance of binary eutectic PCM comprising lauric acid (LA) and 1-hexadecanol (HD), the composite PCMs are developed, where the powdered seashell waste is added as thermal enhancer, and their thermo-physical properties are characterized via DSC, FT-IR, SEM, TGA, cooling curve analysis, accelerated thermal cycling test together with thermal conductivity measurement. Meanwhile, the impacts of two particle sizes, five mixing ratios between two different sizes and two modification approaches of seashell powder (SP) are surveyed meticulously. Experimental results turn out that 80-mesh SP and 300-mesh SP are both capable of providing greater thermal conductivity when dispersed in LA-HD eutectic PCM, and the enhancement level of thermal conduction is even higher for composite PCM containing 300-mesh SP than for composite PCM containing TiO 2 powder. Besides, the thermal conduction ability is strengthened to the maximum extent when 80-mesh SP and 300-mesh SP are combined at mass ratio of 3:7, while the same situation also occurs when seashell powder is treated by high-temperature calcination. The resultant composite PCM possesses encouraging melting temperature and melting enthalpy, and its thermal stability and reliability are well approved. Therefore, we conclude that the seashell powder has the expectable competence to realize performance improvement of organic PCM for application in buildings for thermal energy storage.
研究领域:
建筑材料
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能源储存
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可持续发展
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产品关联
DOI
高影响因子
Food Bioscience
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2025
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IF 5.9
Zhengyu Wang,Quanhong Lv,Liangzhong Liu,Zhe Zhu
Constipation is a gastrointestinal disorder related to intestinal flora imbalance and inflammation. Numerous clinical studies have affirmed the efficacy of psyllium husk powder (PHP) in alleviating constipation; however, the efficacy and specific mechanism of PHP in alleviating constipation still lack comprehensive and in-depth discussions. In this study, we comprehensively investigated the mechanism by which round-bracted psyllium husk powder improves loperamide hydrochloride-induced constipation in mice, focusing on gut microbiota and fecal metabolic profiles while comparing the effects of PHP interventions at varying doses to polyethylene glycol 4000 bulk treatment for a comprehensive evaluation of PHP's efficacy in alleviating constipation. Our findings revealed that PHP significantly reduced defecation time and increased fecal output, weight, water content, intestinal motility, and short-chain fatty acid (SCFA) concentrations while positively influencing intestinal inflammation and promoting repair of the intestinal barrier, and higher doses of PHP demonstrate optimal efficacy. Furthermore, PHP markedly modified the microbial composition in constipated mice by enhancing the abundance of beneficial bacteria, particularly Akkermansia muciniphila . UPLC-QTOF-MS/MS analyses indicated that PHP contributed to elevated levels of Cucurbitacin B, BIX 01294 Trihydrochloride along with peptides like Asp-Gly-Lys-Ile-Leu and Val-Met-Met-Val-Arg among other potentially beneficial metabolites. KEGG pathway analysis revealed that PHP alleviates constipation by modulating metabolic pathways associated with SCFA production, beneficial microbiota colonization, and the reduction of intestinal inflammation, encompassing ABC transporters, biosynthesis of unsaturated fatty acids, and galactose metabolism etc. In conclusion, PHP can effectively relieve constipation by remodeling the structure of the gut microbiota while enhancing its associated metabolic pathways and products.
研究领域:
医学
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微生物学
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代谢组学
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产品关联
DOI
高影响因子
International Journal of Environmental Research and Public Health
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2022
·Vol. 19
·期 22
·14835
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IF 4.614
Jinkai Shu,Bozhi Ren,Wei Zhang,An Wang,Sen Lu,Shuyu Liu
Modified Shell Powder/La-Fe-TiO2(La-Fe-TiO2@MSP) composites were fabricated using the sol-gel method and characterized by SEM, XRD, UV-vis DRS and photocurrent techniques, and their physicochemical and optical properties were analyzed. The effects of various factors on the photocatalytic degradation of pyridine and its reaction kinetics were investigated by batch experiments using pyridine, a typical nitrogen-containing heterocyclic compound in coal chemical wastewater, as the target removal species. The pyridine degradation rate of 80.23% was obtained for 800 mg/L composite solution by photocatalytic oxidation of 50 mg/L pyridine wastewater for 180 min at 35 °C, pH = 8 and light intensity of 560 W. The photocatalytic degradation performance was optimal. The quenching experiments determined that the active species of photodegradation were mainly hole and hydroxyl radicals, and the photocatalytic degradation mechanism was analyzed in this way.Keywords:La-Fe-TiO2@MSP;photocatalysis;pyridine;reaction kinetics
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
ADVANCED POWDER TECHNOLOGY
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2024
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IF 4.2
Yang Chen,Zhi Wu,Xiaoming Lou,Jun Ding,Chengji Deng,Chao Yu,Hongxi Zhu,Tao Zhang
In view of the current situation that morphology of SiC whiskers synthesized from rice husk is too single, in this work, the chain-bead SiC whiskers were successfully synthesized via a simple molten-salt method. The effects of heating temperature on the phase composition and morphology of the product were compared under the salt-free and molten-salt conditions. The results indicated that the liquid environment formed by molten salt could retain SiO 2 in the product and promote the formation of cristobalite, inhibiting the formation of SiC. Compared with the SiC synthesized under salt-free condition (linear morphology), the SiC whiskers synthesized by the molten-salt method at 1400 °C showed a chain-bead morphology, which was composed of β-SiC stalks and round beads of amorphous SiO 2 on the stalks. Finally, the formation mechanism of chain-bead SiC whiskers in the molten-salt environment was clarified.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Nanoelectronics and Optoelectronics
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2018
·Vol. 13
·期 12
·1807-1815
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IF 1.069
Wang Zheng,Wang Yan-Shi,Tong Zhuang,Deng Qin,Luo Sheng-Xu
This paper reports the formation of novel adsorbent material based on undulating venus shell (UVS), white conch shell (WCS), conus conch shell (CCS) and abalone shell (AS). These absorbent materials were prepared by grinding the shells followed by high-temperature calcination process.
The prepared adsorbents were well characterized by scanning electron microscopy (SEM), X-ray diffraction and Fourier transform infrared (FTIR) spectroscopy. Further, the effects of adsorbent dosage and temperature on the adsorption of Cd2+ by shell powder and related adsorption
isotherms were evaluated. The results indicated that the amount of adsorbent and temperature have a great influence on the adsorption process of the four adsorbents. Under optimized conditions, the four shell powders exhibited strong adsorption properties of Cd2+ which was consistent
with the Freundlich isotherm adsorption model. The optimal conditions for preparing shell powder adsorbents with the best adsorption performance were determined by evaluating the particle size, calcination temperature and calcination time during the preparation process and the prepared materials
were characterized by several techniques. The results demonstrated that the particle size of UVS powder was over 140 mesh at 450 °C with activation time of 60 min. Furthermore, the UVS powder exhibits apparent porous morphology after calcination and thus the specific surface area was markedly
increased. Consequently, the adsorption performance was significantly improved.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Feng Li,Jianwan Lin,Yongqi Li,Shijia Wu,Cha Wen,Mengting Mo,Linfeng Huang,Ning Qing,Zhenpin Lu,Xing Jiang,Liuyan Tang
While hydrogel coatings have garnered considerable attention in recent years, the utilization of bioresources has been largely overlooked in existing preparation strategies. This study presents a hydrogel coating fabrication method utilizing shell waste-derived shell powder (SP) as a key resource, termed shell powder acidolysis triggered in situ gelation (SP-ATIG). By integrating a SP containing tannic acid-polyvinyl alcohol primer (PVA-TA/SP layer) with sodium alginate, the SP-ATIG method enabled the formation of hydrogel coatings on both flat and irregular surfaces of various substrates (e.g., glass, plastics, metals) with controllable thickness. This method is also capable of constructing dual-network hydrogel coatings, providing substrates with tailored functional surfaces. Moreover, it endowed the resulting hydrogel coatings with patterning capabilities, lubricity, and anti-oil properties, offering them potential applications such as information transmission, self-lubricating materials, and anti-fouling coatings. This work highlights the innovative use of waste bioresources to develop versatile hydrogel coatings, providing a sustainable alternative for advanced functional surface fabrication.
研究领域:
材料科学
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环境科学
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表面工程
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2017
·Vol. 135
·期 4
·45750
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IF 1.86
Youzhou Zhou,Liuqin Ge,Neng Fan,Lingqing Dai,Meisheng Xia
To explore the application of shell powder (SP) in rubber, a dye-loaded SP (DSP) bio-filler based on SP and Congo red was incorporated into natural rubber (NR). The adsorption experiments demonstrated that the maximum monolayer adsorption capacity of Congo red onto SP was 69.3 mg/g. The effect of aluminate coupling agent and DSP was investigated by evaluating the cure characteristics, mechanical, thermal, and coloring properties of NR/DSP composites. It was suggested that the optimum amount of aluminate coupling agent was 2 wt %, and the best tensile strength (24.80 MPa) of vulcanizates was achieved at the DSP content of 20 phr, while other mechanical properties such as tear strength kept increasing with the addition of DSP. Furthermore, the improved thermal stability and uniform color distribution of the NR composites was obtained. The results indicate that DSP is promising to become a low-cost filler and pigment for rubber materials. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 45750.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2018
·
IF 3.909
Junjun Kong,Yi Li,Yungang Bai,Zonglin Li,Zengwen Cao,Yancun Yu,Changyu Han,Lisong Dong
A novel polyester poly(diethylene glycol succinate) (PDEGS) was synthesized and evaluated as a plasticizer for polylactide (PLA) in this study. Meanwhile, an effective sustainable filler, functionalized eggshell powder (FES) with a surface layer of calcium phenyphosphonate was also prepared. Then, PLA biocomposites were prepared from FES and PDEGS using a facile melt blending process. The addition of 15 wt% PDEGS as plasticizer showed good miscibility with PLA macromolecules and increased the chain mobility of PLA. The crystallization kinetics of PLA composites revealed that the highly effective nucleating FES significantly improved the crystallization ability of PLA at both of non-isothermal and isothermal conditions. In addition, the effective plasticizer and well-dispersed FES increased the elongation at break from 6% of pure PLA to over 200% for all of the plasticized PLA composites. These biodegradable PLA biocomposites, coupled with excellent crystallization ability and tunable mechanical properties, demonstrate their potential as alternatives to traditional commodity plastics.
研究领域:
材料科学
·
环境科学
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DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 31
·17543-17550
·
IF 3.049
Chuan-ming Yu,Xiao-hui Zhuang,Sheng-wei Zeng,Qi-xing Dong,Zhan-xin Jing,Peng-zhi Hong,Yong Li
In this paper, poly(styrene-divinylbenzene) foams were synthesized using a high internal phase emulsion (HIPE) technique with Span 80 and with 900 °C calcined oyster shell powder as a co-emulsifier, 2,2′-azobisisobutyronitrile (AIBN) as an initiator and deionized water as the dispersing phase. SEM images revealed that the materials possess a hierarchical porous structure of nano/micro size, which resulted in saturated oil adsorption in only half a minute. The dispersing phase amount was investigated for its effect on adsorption. The optimized foams have 24.8–58.3 g g−1 adsorbencies for several organic solvents, and they demonstrated superhydrophobicity and excellent oleophilicity with the water contact angle (WCA) even close to 149° and oil contact angle approaching 0°. Moreover, the foams displayed high oil retention under pressure. The adsorption–centrifugation cycling results indicated high repeatability of the recovered foams. All of these features predicted the potential applications of superhydrophobic foams in oil–water separation.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）