Open Access. Powered by Scholars. Published by Universities.®

Digital Commons Network™

Open Access. Powered by Scholars. Published by Universities.®

Life Sciences

Changsha University of Science and Technology

Articles 1 - 9 of 9

Full-Text Articles in Entire DC Network

Preparation Of Xanthoceras Sorbifolia Bunge Shell Biochar Activated By Phosphoric Acid And Its Adsorption Performance For Methylene Blue, Chen Yan-Qin, Wang Xue-Li, Song Shi-Fang, Liu Zun-Qi Jun 2023

Preparation Of Xanthoceras Sorbifolia Bunge Shell Biochar Activated By Phosphoric Acid And Its Adsorption Performance For Methylene Blue, Chen Yan-Qin, Wang Xue-Li, Song Shi-Fang, Liu Zun-Qi

Food and Machinery

Objective: The adsorption performance and mechanism of Xanthoceras sorbifolia shell biochar activated by phosphoric acid for methylene blue was investigated in this study. Methods: With phosphoric acid as activator, the Box-Behnken center combination design was used to optimize the preparation conditions of biochar from Xanthoceras sorbifolia shell. The biochar obtained under the optimal preparation conditions was used to adsorb methylene blue in water. Through investigating the adsorption influencing factors, the adsorption characteristics of biochar on methylene blue were determined, and combined with the analysis of kinetic, the adsorption mechanism was discussed. Results: The optimum technological conditions for preparing biochar from …

Go to article

Study On Physicochemical Properties And Pyrolysis Properties Of Heated Non Combustion Tobacco Sheet, Xi Pan, Xu-Yan Song, Min Wei, Ran Li, Ai-Jun Dong, Jun-Jian An, Lei Wang Feb 2023

Study On Physicochemical Properties And Pyrolysis Properties Of Heated Non Combustion Tobacco Sheet, Xi Pan, Xu-Yan Song, Min Wei, Ran Li, Ai-Jun Dong, Jun-Jian An, Lei Wang

Food and Machinery

In order to evaluate the safety of heat-not-burn tobacco sheets during suction and establish the theoretical basis for adding flavors and fragrances in the process of heat-non-burn cigarettes, the mainstream heating-not-burn tobacco samples from domestic and foreign markets were comprehensively analyzed from physical and chemical indicators, thermogravimetric analysis and pyrolysis analysis. The results showed that: the content of hot water extract was 49.98%~66.59%, which difference was not remarkable. And the content of total sugar was 6.62%~28.93%, the content of reducing sugar was 4.79%~22.30%, the content of total alkaloid was 0.14%~1.13%, the content of total nitrogen was 0.31%~2.50%, and the content …

Go to article

Optimization Of Extraction Conditions For Volatile Flavor Compounds In Crayfish Boiled Liquid Based On Hs-Spme-Gc-Ms, Yang Qi-Fu, Xu Wen-Si, Hu Si-Si, Ma Jia-Chen, Huang Di, Liu Li-Ping, He Jiang, Yang Pin-Hong, Zhou Shun-Xiang Jul 2022

Optimization Of Extraction Conditions For Volatile Flavor Compounds In Crayfish Boiled Liquid Based On Hs-Spme-Gc-Ms, Yang Qi-Fu, Xu Wen-Si, Hu Si-Si, Ma Jia-Chen, Huang Di, Liu Li-Ping, He Jiang, Yang Pin-Hong, Zhou Shun-Xiang

Food and Machinery

Objective:In order to increase the added value of crayfish by-products.Methods:With chromatographic peaks and peak areas as the inspection indicators, the optimization on equilibrium time, addition of sodium chloride, extraction time and extraction temperature were optimized, and the composition of volatile flavor compounds was analyzed.Results:The optimal extraction conditions were equilibrium time 0 min, extraction temperature 75 ℃, extraction time 50 min, addition of sodium chloride 30% with 50/30 μm DVB/CAR/PDMS solid phase microextraction head. Under these conditions, a total of 34 volatile flavor compounds, including 5 alcohols, 12 aldehydes, 5 alkanes, 5 aromatic, 5 heterocyclic …

Go to article

The Influence Of Modifying Methods On The Adsorption Of Methylene Blue By Moringa Oleifera Seed Shelling Biochar, Dong Cheng, Li Mei-Ping, Guo Cai-Xia, Yu Li-Gang Nov 2021

The Influence Of Modifying Methods On The Adsorption Of Methylene Blue By Moringa Oleifera Seed Shelling Biochar, Dong Cheng, Li Mei-Ping, Guo Cai-Xia, Yu Li-Gang

Food and Machinery

Objective: The adsorption performance of the seed-shell biochar from Moringa oleifera prepared under different technological conditions on methylene blue was investigated in this study. Methods: The magnetic seed shelling biochar (Fe3O4-MOS) and modified seed shelling biochar (KOH-MOS) were prepared by ultrasonic-assisted K2CO3-Fe3O4 co-impregnation pyrolysis and KOH impregnation pyrolysis at 1 000 ℃, respectively. The physicochemical properties of the samples were characterized by XRD, SEM and FTIR. On this basis, the adsorption characteristics of the two kinds of biochar for methylene blue (MB) solution were determined by equilibrium adsorption method. …

Go to article

The Determination Of Residues Of Bentazone And Its Metabolites In Rice And Wheat Flour By High-Performance Liquid Chromatography-Ms/Ms, Liu Di, Yang Qing, Han Li, Yu Ting-Ting, Cao Qi, Jiang Feng, Wang Hui-Xia Jan 2021

The Determination Of Residues Of Bentazone And Its Metabolites In Rice And Wheat Flour By High-Performance Liquid Chromatography-Ms/Ms, Liu Di, Yang Qing, Han Li, Yu Ting-Ting, Cao Qi, Jiang Feng, Wang Hui-Xia

Food and Machinery

A general QuEChERS purification method was used to establish an HPLC-MS/MS method for the determination of Bentazone and its metabolites 6-hydroxymetazone and 8-hydroxymetazone residues in rice and flour. The results showed that the calibration curves had a good linear relationship between bentazone and its metabolites in the range of 0.1 to 100.0 μg/kg, and the linear correlation coefficients (R2) were all greater than 0.995, with the limits of quantification were all 0.2 μg/kg. Methods at the levels of 0.2 μg/kg, 0.4 μg/kg and 2 μg/kg, the average recovery rates were between 89.6% and 106.9%, and the relative standard …

Go to article

Study On The Preparation Of Tetracyline Magnetic Molecularly Imprinted Biochar Microspheres Based On Pickering Emulsion Polymerization, Ma Zhen-Zhen, He Jin-Xing, Zhao Tao, Zhao Xiao-Lei May 2020

Study On The Preparation Of Tetracyline Magnetic Molecularly Imprinted Biochar Microspheres Based On Pickering Emulsion Polymerization, Ma Zhen-Zhen, He Jin-Xing, Zhao Tao, Zhao Xiao-Lei

Food and Machinery

In this study, magnetic molecularly imprinted biochar microspheres for specific adsorption of tetracylines (TCs) were prepared by Pickering emulsion polymerization using tetracyline (TC) as template and Fe3O4 and biochar as co-stabilizers. The adsorption properties of the imprinted microspheres for TC were studied by adsorption kinetics test, adsorption isothermal test, and selectivity adsorption test, exhibiting the excellent specific adsorption for TC with imprinting factor of 3.97. Further more, the imprinted materials were used as adsorbents for extraction and purification of TCs in real samples, and the content of TCs were detected through high performance liquid chromatography (HPLC). Under …

Go to article

Dictection Of Special Spoilage Organisms Of Chicken Breast In Different Storage Conditions, Zhang Li, Yin Defeng, Zhang Dawen, Luo Linguang Dec 2019

Dictection Of Special Spoilage Organisms Of Chicken Breast In Different Storage Conditions, Zhang Li, Yin Defeng, Zhang Dawen, Luo Linguang

Food and Machinery

In order to explore the special spoilage organisms (SSO) of the chicken breast in different storage conditions, the fresh chicken breast of Ningdu Yellow chicken was used as the experimental material. Three preservation methods were used to preserve the chicken breast, including the tray aerobic packaging preservation under 4 ℃ and 25 ℃, vacuum packaging preservation under 4 ℃. The total number of colonies and TVB-N value of the chicken breast were measured during these preservation processes and their surface bacterial diversity was analyzed. The results showed that when the aerobic packaging chicken was stored for 7 days under 4 …

Go to article

Study On The Abnormality Among Accumulation And Fermentation Of Maotai-Flavor Liquor In Winter Byturning And Translocation Stacking, Yuan Zaishun, Hu Ping, Chen Qian, Wang Xiaoyu Apr 2019

Study On The Abnormality Among Accumulation And Fermentation Of Maotai-Flavor Liquor In Winter Byturning And Translocation Stacking, Yuan Zaishun, Hu Ping, Chen Qian, Wang Xiaoyu

Food and Machinery

Under the condition of low temperature in winter, the accumulation and fermentation of Maotai-flavor liquor often shows abnormal heating. In this experiment, the abnormal fermentation heap A in the first and second rounds of fermentation was treated with Turning and translocation stacking. The normal accumulation of fermented grain B in the same workshop was used as a control to study the changes of fermentation microbes and physical and chemical indicators in the fermented grains, and analyze their correlation with the quality and yield of wine. Results: the turning and translocation stacking treatment could restore the normal temperature of the abnormal …

Go to article

Advacnes On Biological And Farming Technology For The Prevention And Treatment Of Cadmium In Rice, Shen Junjun, Lin Qinlu, Luo Feijun Dec 2018

Advacnes On Biological And Farming Technology For The Prevention And Treatment Of Cadmium In Rice, Shen Junjun, Lin Qinlu, Luo Feijun

Food and Machinery

In this paper, on account of the current situation that some rice have high cadmium content or even exceeds the national standard, the severity and regional distribution currently at home and abroad are analyzed. The necessity of controlling cadmium pollution of rice was revealed, and the methods of biotechnology and farming at home and abroad were systematically integrated,such as screening low cadmium enriched rice varieties using biological technology, hybrid technology and genetic engineering technology that includes transgene technology, gene knockout and gene silencing to improve rice traits. The microbial adsorption method and fermentation technology to reduce the cadmium content in …

Go to article