FUEL
·
2019
·
IF 5.128
Lina Han,Weiguo Ren,Bing Wang,Xingxing He,Lingjun Ma,Qihuang Huo,Jiancheng Wang,Weiren Bao,Liping Chang
In this work, a novel method is introduced to activate coal gangue (CG) for extraction of Si and Al species. The activation experiments were carried out using a stainless steel tube reactor (17 mL) and an autoclave reactor (1000 mL). Firstly, CG was activated by supercritical water added with alkali. It was found that the kaolinite phase of raw CG could be transformed into cancrinite, sodalite and kalsilite by using NaOH, Na 2 CO 3 and KOH as activators, respectively. Secondly, silica (SiO 2 ) and alumina (Al 2 O 3 ) were prepared by acid and alkali combination method. The extraction rates of Al 3+ and Si 4+ from the activated CG using KOH as activator were as high as 78.9% and 69.2%, respectively. The purity of SiO 2 and Al 2 O 3 products were 96.2% and 99.3%, respectively. The as-synthesized SiO 2 both from 17 mL and 1000 mL reactor exhibited very high specific surface areas of 710.0 m 2 ·g −1 and 872.8 m 2 ·g −1 , respectively. In addition, the SiO 2 after hydrophobic modification displayed excellent absorption selectivity for xylene.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ULTRASONICS SONOCHEMISTRY
·
2017
·
IF 4.218
Likang Fu,Libo Zhang,Shixing Wang,Wei Cui,Jinhui Peng
A synergistic extraction method for gold from the refractory gold ores via ultrasound and chlorination-oxidation was developed. The effects of solid-liquid ratio, extraction time, ultrasound power, NaClO concentration and NaOH concentration on the extraction rate of gold from the refractory gold ore were investigated . The optimum conditions were as follows: NaClO concentration of 1.5 mol/L, NaOH concentration of 1.5 mol/L, solid-liquid ratio of 5, ultrasound power of 200 W and ultrasound time of 2 h. Under the optimal conditions, 68.55% of gold was extracted. However, only 45.8% of gold was extracted after 6 h without the ultrasound-assisted extraction. XRD and SEM were used to analyze the influence of ultrasound on the mineral properties and strengthening mechanism. The results showed that the interface layer was peeled, new surface was exposed, reaction resistance was reduced, the liquid-solid reaction was promoted and reaction speed was greatly improved under ultrasound. According to the results of range and variance analysis, the optimum leaching experiment with orthogonal design was almost identical with the optimum experiment of single factor. Among them, the ultrasound power was the most significant factors affecting leaching rate of gold. Compared with other extraction method, the synergistic extraction process decomposed completely sulfide and improved significantly the extraction rate of gold.
研究领域:
冶金学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Processes
·
2022
·Vol. 11
·期 1
·110
·
IF 3.352
Mingsheng Luo,Xinyue Liu,Zhijun Zhao,Fengli Wang,Changke Shao
Using honeysuckle as raw material, chlorogenic acid (CGA) was extracted with different alcohols. Based on the single-factor experiment design, the relationship between each parameter and the response value was explored by Box–Behnken method to optimize the process conditions. Best extraction results were obtained under the conditions of solid-to-liquid ratio of 1:20, the ultrasonic time of 40 min, the ultrasonic vibrator power of 240 w, and the CGA extraction rate of 2.98%. The experimental data show that the extraction rate of CGA is related to the length of the alcohol carbon chain and the number of hydroxyl groups in the extractant. The results from this work can provide technical basis for the safe and efficient production of CGA from honeysuckle.
研究领域:
植物化学
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药物化学
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食品科学
✓ 已验证
DOI
高影响因子
HYDROMETALLURGY
·
2019
·
IF 3.465
Yongli Li,Zhongwei Zhao
For more than a hundred years, extraction with ethyl ether has been the most used method for synthetizing H 3 PW 12 O 40 . However, the use of ethyl ether as the extraction agent faced many problems, such as strict regulation by public safety and environment authorities, poor operating environment, significant dissolution loss, low yields (approximately 80%), and difficulty in realizing continuous production. To overcome these problems, a new extraction method has been proposed in this paper, which uses 2-octanol as the extraction agent and water as the stripping agent. Under optimal conditions (30% 2-octanol in kerosene, O:A = 1:1, 180 g/L H 2 SO 4 , 20 g/L H 3 PO 4 , 45 °C, and a contact time of 2 min), 90.2% of H 3 PW 12 O 40 contained in the solution was extracted in a single stage; the loaded H 3 PW 12 O 40 could then be stripped completely via 3-stage continuous countercurrent stripping by maintaining O:A = 5:1, 65 °C, and t = 5 min. Finally, the obtained strip liquor, containing more than 550 g/L H 3 PW 12 O 40 , was evaporated to obtain crystals, resulting in an increased recovery rate of 10%.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2022
·
IF 9.231
Ting Ye,Hangbin Yan,Xu Wang,Weifan Zhao,Fang Tao,Yu Zhou
In daily tea drinking, little is known on aflatoxin transfers from tea-leaf to infusion during brewing and the actual intake. A verified aflatoxins analytical method on tea infusion is significant to the exposure assessment. Here, an optimal method 3 (M3) was screened and validated on four aflatoxins (B 1 , B 2 , G 1 and G 2 ) simultaneous determination. Recoveries of AFG 1 and AFB 1 were 87.37 %±1.99 %-102.03 %±8.62 %, and AFG 2 and AFB 2 were 83.99 %±8.65 %-100.14 %±1.69 %. The correlation coefficient on the fortified samples determination was > 0.99 for each aflatoxin. In accuracy and precision validation, aflatoxins recoveries in high and low fortified samples were 85.94 %-103.83 %, and RSDs were 2.20 %-9.15 %. Method applicability test showed that the M3 was qualified for six different dark tea types. Extraction rate of 30-days stored AFB 1 fortified tea-leaf by acetonitrile–water (84:16, v/v) was < 50 %; meanwhile, only 2.94 % spiked AFB 1 was released by ten times tea brewing which indicated that Puerh tea have strong adsorbability to aflatoxin.
研究领域:
食品科学
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分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BIORESOURCE TECHNOLOGY
·
2021
·
IF 9.642
Jing Li,Zhaomeng Liu,Chengqi Feng,Xiaoying Liu,Fangyu Qin,Chen Liang,Huiyang Bian,Chengrong Qin,Shuangquan Yao
The premise of high value utilization of lignocellulosic biomass is effective separation of hemicellulose. In this paper, the extraction of bamboo hemicellulose using freeze-thaw assisted alkali treatment (FAT) was studied. The effect of alkali concentration, alkali treatment time, freezing temperature, and freeze-thaw time on the main components was studied. Bamboo was frozen at −30 °C for 12 h, thawed at room temperature, and then treated at 75 °C for 90 min with 7.0% alkali. The extraction rate of hemicellulose was as high as 64.71%. The purity of hemicellulose samples using conventional AT decreased from 82.63% to 78.56%. Hemicellulose with the same yield as that of conventional alkali treatment was obtained by further reducing the alkali concentration. The purity of hemicellulose samples increased from 82.63% to 89.45%. It had a higher purity, higher molecular weight, and lower polydispersity. A new, green and efficient alkaline extraction method for hemicellulose was developed.
研究领域:
生物化学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2014
·
IF 3.107
Yulong Chen,Jijun Wu,Yujuan Xu,Manqing Fu,Gengsheng Xiao
A second cooling was added to the oil collectors of an improved Clevenger-type apparatus (ICT) to investigate the thermal reaction of essential oils from orange peel compared to a traditional Clevenger-type apparatus (CT). The results demonstrated the yield rate of essential oil from ICT was significantly higher (p < 0.05) than that from CT. The major components of the essential oils consisted of monoterpenes, such as d-limonene, β-myrcene, β-pinene, γ-terpinene, α-pinene. Interestingly, ICT prevented the thermal reaction—the transformation of β-myrcene to β-thujene—and reduced the oxidation on α-pinene and β-pinene of the essential oil in comparison to CT. In addition, the yield rate of γ-terpinene can also be improved via ICT compared to CT. Thus, ICT is an effective improvement to traditional CT.
研究领域:
植物化学
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食品科学
·
芳香植物研究
✓ 已验证
DOI
PubMed
高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
·
2021
·
IF 4.952
Haolan Dong,Taotao Dai,Lu Liang,Lizhen Deng,Chengmei Liu,Qian Li,Ruihong Liang,Jun Chen
Vacuum microwave drying (VMD) technique was applied for drying fresh navel orange peel (NOP) under different vacuum degrees including 0, 25, 45, 65, and 85 kPa. Compared with the traditional hot-air drying (HAD), the drying time of VMD was remarkably reduced by 90.7–94.7%. In addition, the drying time had a negative correlation to the vacuum degree, the drying time at 85 kPa was only 5.3% of HAD. The extraction yield of VMD pectin was significantly higher than that of HAD. Comparing to HAD, the extracted pectin by VMD exhibited an increase in the degree of methoxylation, but a decline in the average molecular weight and apparent viscosity. Moreover, the VMD can promote pectin adsorption capacities to the Pb 2+ with the adsorption mechanism of the pseudo-second-order kinetic model. These findings indicated that VMD is a powerful, efficient, time-saving technology for drying fresh NOP and assisting extraction of pectin from NOP.
研究领域:
食品科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Debao Niu,Er-Fang Ren,Jian Li,Xin-An Zeng,Si-Lun Li
Naringin is a bioactive compound that exists abundantly in the by-product of citrus fruits processing. The effects of various pulsed electric field (PEF) treatments (2–10 kV/cm, 10–50 pulses) on the extraction yield of naringin from the white capsule of pomelo peel were investigated. Results showed that PEF treatment could significantly enhance the extraction yield of naringin, in particular at the electric field intensity of 4 kV/cm and pulses of 30, the extraction yield was increased by 20% compared with non-PEF treatment. Moreover, the antioxidant activity of naringin was assessed by the assay of DPPH radical scavenging rate (RSA). Results showed that different PEF treatments had diverse effects on RSA values, which may be attributed to the changes in the structure of naringin under PEF treatments. This was confirmed by the results from scanning electron microscope, Fourier transform infrared spectroscopy , and nuclear magnetic resonance spectroscopy , showing that PEF treatment changed the conformation of naringin without its degradation. These findings suggested that PEF treatment of appropriate intensity was a promising method to enhance the extraction of naringin from the white capsule of pomelo peel, and provided a basis for modifying the physicochemical properties of naringin in the future.
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
Antibiotics-Basel
·
2022
·Vol. 11
·期 9
·1252
·
IF 5.222
Samar Zuhair Alshawwa,Eman J. Mohammed,Nada Hashim,Mohamed Sharaf,Samy Selim,Hayaa M. Alhuthali,Hind A. Alzahrani,Alsayed E. Mekky,Mohamed G. Elharrif
In the present study, we utilizedStevia rebaudianaL. (SRLe) extract to in situ biosynthesize nanoscale alpha hematite (α-Fe2O3) nanoparticles (NPs) with potent antioxidant, antimicrobial, and anticancer properties. SRLe-α-Fe2O3was characterized using physiochemical analyses, including UV/Vis, FTIR, XRD, DLS, EDX, SEM, and TEM studies. Among tested solvents, CHCl3/MeOH (2:1v/v) SRL extract (least polar solvent) contained the highest EY, TPC, and antioxidant capacity of ~3.5%, ~75 mg GAE/g extract, and IC50= 9.87 ± 0.7 mg/mL, respectively. FTIR confirmed the engagement of coating operation to the colloidal α-Fe2O3NPs. TEM, SEM, and DLS revealed that SRLe-α-Fe2O3has a spherical shape, uniform size distribution with aggregation for an average size of ~18.34 nm, and ζ = −19.4 mV, forming a repulsive barrier that helped to improve stability. The synthesized nanoparticles displayed considerable antibacterial activity againstE. coliandS. aureusbacterial growth, and exhibited superior activity against the A549 lung cancer cell lines. These findings indicate that the increased availability of bioactive substances with antioxidant properties of SRLe makes it a potentially interesting material for the preparation of biologically active compounds and green synthesis of nanoparticles.Keywords:Stevia rebaudianaL.;IONP green synthesis;antioxidant;cytotoxic;antitumor;extraction yield
研究领域:
生物化学
·
纳米医学
·
植物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2025
·
IF 5.2
Xuehui Zhang,Qing Sun,Yuan Chen,Yanju Lu,Lu Li
The characteristics of natural aromatic compounds have promoted the research of efficient extraction methods. In this study, quantum chemical (QC) calculation, molecular dynamics (MD) simulation and experimental verification were combined to solve the problems of low extraction rate and solvent pollution of agarwood essential oil, and the screening and extraction mechanism of green extractants were systematically analyzed. Based on the mechanism of ethanol extraction of the main components of agarwood essential oil, through QC calculation, extraction experiments and Fourier transform infrared spectroscopy (FT-IR), it was found that choline chloride:ethylene glycol (ChCl:EG) at 1: 4, T = 40 °C , under the condition of 8 h, the extraction rate reached 24.2 %, which was 226 % higher than that of traditional ethanol solvent, and maintained good stability in five reuse cycles. In addition, the extraction mechanism of the process was clarified. The hydroxyl group in ChCl:EG forms additional interaction sites with the oxygen atoms on the ring structure of the target compound, which enhances the hydrogen bond and van der Waals force, and significantly improves the selective dissolution of the target compound. The effects of different ChCl:EG ratios and temperatures on the extraction efficiency were evaluated by MD simulation. The results show that the effect of temperature on the interaction of the system is greater than that of the proportion, and ethylene glycol in Deep Eutectic Solvents (DES) plays a major role. This research provides new insights into the use of DES for green extraction of natural products and establishes a theoretical and experimental basis for future industrial applications.
研究领域:
植物化学
·
天然产物开发
·
分子生物学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Food Engineering
·
2020
·Vol. 16
·期 11
·
IF 1.022
Jitian Song,Shi Dongqi,Su Hang,Feng Yongxia,Tian Wei
Ultrasonic extraction was a new development method to achieve high-efficiency extraction of Lycium barbarum polysaccharides instead of hot water extraction. In this paper, the single factor method combined with the box Behnken design of response surface method was used to study the influence of extraction time, extraction temperature, material liquid ratio and ultrasonic power on the extraction rate of L . barbarum polysaccharide. The results indicated that the best extraction rate of L . barbarum polysaccharide was 12.54 ± 0.12% under the conditions of 80 min for extraction time, 73 °C for extraction temperature, 1 g:38 mL for material to liquid ratio, and 185 W for ultrasonic power. Under the same operating conditions, the yield of L . barbarum polysaccharide using ultrasonic extraction was 83.3%, which was higher than that hot water extraction. Moreover, the extraction time of ultrasonic extraction was only 47% of that using hot water extraction. This suggested that there was great potentials of using ultrasonic extraction in the realization of high-efficiency extraction of L. barbarum polysaccharide. The results of this study could also provide a theoretical basis for the coupling of ultrasonic extraction and ultrasonic concentration process to develop the integrated equipment of both ultrasonic extraction and ultrasonic concentration.
研究领域:
食品科学
·
植物化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）