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144 results on '"Liu, Ji-Dong"'

24. Comparison of LLE and SPME Methods for Screening the Aroma Compounds in Rum

Author

Zhang, Ming-jun, Chen, Yu, Liu, Ji-dong, Li, Kai, and Li, Jian-bin

Abstract

Liquid–liquid extraction (LLE) and solid-phase microextraction (SPME) methods were applied to extract the aroma compounds of rum. Aroma compounds were separated and analyzed with gas chromatography–mass spectrometry of DB-WAXetr capillary columns. One hundred and twelve compounds, including alcohols, esters, aldehydes, ketones, phenols, acids, and other compounds, were identified by two extraction methods. Among them, 88 and 74 compounds were identified by SPME and LLE, respectively. SPME and LLE methods were suitable for the qualitative and semi-quantitative analysis of rum, respectively. Principal component analysis results showed that the first principal component (PC1) and the second principal component (PC2) explained 80.9% of the difference in variable samples (PC1 = 52.7%, PC2 = 28.2%), which can represent the variable characteristics of the samples. The extraction effects of LLE and SPME on the aroma compounds of rum obviously differed, however, the aroma compounds obtained by the two extraction methods can complement each other. Supplemental data for this article is available online at at [publisher’s weblink].

Published
2021
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26. Comparison of LLE and SPME Methods for Screening the Aroma Compounds in Rum.

Author

Zhang, Ming-jun, Chen, Yu, Liu, Ji-dong, Li, Kai, and Li, Jian-bin

Subjects
RUM, GAS chromatography/Mass spectrometry (GC-MS), FOOD aroma, PRINCIPAL components analysis, LIQUID-liquid extraction, CAPILLARY columns
Abstract

Liquid–liquid extraction (LLE) and solid-phase microextraction (SPME) methods were applied to extract the aroma compounds of rum. Aroma compounds were separated and analyzed with gas chromatography–mass spectrometry of DB-WAXetr capillary columns. One hundred and twelve compounds, including alcohols, esters, aldehydes, ketones, phenols, acids, and other compounds, were identified by two extraction methods. Among them, 88 and 74 compounds were identified by SPME and LLE, respectively. SPME and LLE methods were suitable for the qualitative and semi-quantitative analysis of rum, respectively. Principal component analysis results showed that the first principal component (PC1) and the second principal component (PC2) explained 80.9% of the difference in variable samples (PC1 = 52.7%, PC2 = 28.2%), which can represent the variable characteristics of the samples. The extraction effects of LLE and SPME on the aroma compounds of rum obviously differed, however, the aroma compounds obtained by the two extraction methods can complement each other. Supplemental data for this article is available online at at [publisher's weblink]. [ABSTRACT FROM AUTHOR]

Published
2022
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37. Exploring the Impact of Visual Heat Conduction Paths on Thermal Conductivity of Polymer Composites and the Practical Applications

Author

Sun, Xin, Ma, Wen-Xuan, Zhang, Jian-Xin, Wang, Zheng-Yi, Wang, Yang, Zhang, Heng, Du, Xiang-Yun, Liu, Ji-Dong, Li, Weili, and Zhao, Zheng-Bai

Abstract

The theory of heat conduction paths has been widely recognized and widely studied in the research about the thermal conductivity of thermal conductive polymer composites at present. Encapsulating polymer pellets with thermally conductive fillers and processing them into thermally conductive polymer composites is a simple and effective method for constructing heat conduction paths. It is meaningful to investigate the related heat conduction mechanism of this method. Otherwise, this approach can significantly preserve the performance of the polymer substrate, making it highly valuable for practical material applications. In this work, polyethylene-octene elastomer (POE) pellets were encapsulated with thermal conductive fillers by physical absorption. Subsequently, the composite films containing heat conduction paths were fabricated using the encapsulated POE pellets through a heating press. Alumina (Al2O3), boron nitride (BN), and alumina/boron nitride hybrid (Al2O3/BN) fillers were used to prepare Al2O3@POE, BN@POE, and BN/Al2O3@POE composite films to investigate the influence of filler shapes on heat conduction path construction. The influence of the constitute and density of heat conduction paths on the thermal conductivity of composite films was analyzed by infrared thermal imaging, finite element analysis, and thermal resistance theory in detail. Owing to the reserved good adhesion and flexibility of the POE substrate, the composite films could be directly used as thermal interface materials for chip cooling, which presented a good heat dissipation effect. Furthermore, a series of integrated composite materials were prepared by the combination of encapsulated pellets with various functional films (copper foil, aluminum foil, and graphite sheet) through a one-pot heating press, exhibiting a good electromagnetic shielding effect. The performance of the composites and the corresponding preparation method demonstrate the strong significance of this research for practical applications.

Published
2024
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38. Self-Healing Hydrogel toward Metal Ion Rapid Removal via Available Solar-Driven Fashion

Author

Wang, Cheng, Liu, Ji-Dong, Li, Qing, and Chen, Su

Abstract

Heavy metal ion pollution has been considered a big issue because of the high harmful and destructive effects to human beings. Hydrogel adsorption has received considerable interest in this aspect. However, the challenge still exists because the adsorption process is time-consuming. Herein, we designed and prepared poly(HPA-co-AA-co-NVP) hydrogels (HPA = hydroxypropyl acrylate, AA = acrylic acid, NVP = N-vinyl-2-pyrrolidone) via frontal polymerization (FP) for heavy ion removal. By virtue of high reaction rate of FP, the whole process of polymerization could be accomplished within 10 min without further energy. The as-prepared hydrogels exhibited pH sensitivity, excellent self-healing properties (a self-healing efficiency up to 90.9%), and heavy metal ion adsorption behavior. More importantly, we developed a new solar-driven method for rapid ion uptake, where solar energy was used to facilitate the adsorption rate. As compared to general adsorption in water without any treatment, this new solar-driven method provides a great efficient adsorption process toward heavy metal ions, which increases by 6 times. Furthermore, the application in desalination of seawater was also realized by the solar-driven method. This work not only provides a time-saving and low-energy synthesis pathway for multifunctional hydrogels via FP but also gives a new insight into rapid removal of ions by a new solar-driven method.

Published
2024
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40. The dynamics of age structures on Agropyron michnoi and Leymus chinensis in community with two dominant species populations

Author

Liu Ji-Dong, Jin Xiao-Ming, Lu Xin-Shi, and Ai Lin

Subjects
education.field_of_study, Secondary succession, Age structure, Population, North china, Leymus, Vegetation, Biology, Tillers, seedlings, clone, age structures, single community, mixed community, biology.organism_classification, Applied Microbiology and Biotechnology, Agropyron michnoi, Agronomy, Botany, Genetics, Number ratio, education, Agronomy and Crop Science, Molecular Biology, Biotechnology
Abstract

In this study, the method of unit sampling was adopted for two years to investigate and analyze the age structure of clonal tillers and seedlings of Agropyron michnoi and Leymus chinensis in the secondary succession process of Hulunbeier sandy vegetation in north China. The results indicate that in single and mixed communities, tillers of A. michnoi were composed of 3 or 4 age classes respectively, and those of L. chinensis were composed of 2 age classes. Seedlings of A. michnoi were all composed of 4 age classes, while those of L. chinensis were composed of 2 or 3 age classes, respectively. The tillers number of A. michnoi and L. chinensis in single community reduced by 10.8 and 29.7%, respectively in 2010 when compared with those in 2009; while in mixed community, the tillers number of A. michnoi reduced by 8.9%, but that of L. chinensis increased by 15.9%. In single community, the seedlings numbers of A. michnoi and L. chinensis, respectively reduced by 26.3 and 31.2%, while in mixed community, the seedlings number of A. michnoi reduced to 22.0%, but that of L. chinensis increased by 7.1%. The number ratio of various age classes of A. michnoi and L. chinensis seedlings in 2009 was basically the same as that of tillers in 2010. Both in single and mixed communities, the A. michnoi population tended to change from growing type to stable type or declining type, while L. chinensis population always remained increasing with slight reduction. The general tendency was obviously shown specially in mixed community. L. chinensis could be considered as the dominant species, while A. michnoi lost its dominant status and made the companion species in the community.Key words: Tillers, seedlings, clone, age structures, single community, mixed community.

Published
2013

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