JOURNAL OF MOLECULAR LIQUIDS
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2018
·
IF 4.513
Rui Li,Yunkang Chang,Yuran Zhang,Xiang'e Chen,Youshuang Zhu
The foam-induced enzyme denaturation , which often results in a large activity loss, is a common phenomenon in foam fractionation of enzymes. To reduce it effectively, we used a Tween 20-containing antifoaming agent to assist the renaturation of the enzyme molecules adsorbed at the gas-liquid interface during defoaming with pepsin as a model enzyme. We studied the roles of the antifoaming agent and its ingredients in renaturation of the adsorbed pepsin molecules. The results show that during defoaming, Tween 20 in the antifoaming agent was able to assist the adsorbed pepsin molecules to restore their native structures as soon as they were desorbed from the gas-liquid interface. The other ingredients, including polydimethylsiloxane, polyether L61 and aluminum silicate, did not affect the pepsin structure during defoaming. However, they enhanced the Tween 20-assisted renaturation of the adsorbed pepsin molecules by increasing the defoaming efficiency. Furthermore, the separation of the antifoaming agent from pepsin in the foamate had no significant effect on its specific activity. When the addition amount of the antifoaming agent in the foamate was 15.0‰ ( v / v ), almost all the adsorbed pepsin molecules were reactivated. Therefore, the foam-induced pepsin denaturation was reduced effectively without any changes of the foam fractionation process itself. The results are important to improve the performances of foam fractionation of enzymes.
研究领域:
生物化学
·
酶工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2023
·
IF 4.1
Bo Peng,Yifan Hao,Chao Si,Bo Wang,Chengfeng Luo,Menghao Chen,Cheng Luo,Baijuan Gong,Zhimin Li
Oral cancer is the most common malignant tumor in the oral and maxillofacial region, which seriously threatens the health of patients. At present, radiotherapy is one of the commonly used methods for oral cancer treatment. However, the resistance of cancerous tissues to ionizing radiation, as well as the side effects of X-rays on healthy tissues, still limit the application of radiotherapy. Therefore, how to effectively solve the above problems is still a challenge at present. Generally speaking, elements with high atomic numbers, such as bismuth, tungsten, and iodine, have a high X-ray attenuation capacity. Using nanomaterials containing these elements as radiosensitizers can greatly improve the radiotherapy effect. At the same time, the modification of nanomaterials based on the above elements with the biocompatible polymer can effectively reduce the side effects of radiosensitizers, providing a new method for the realization of efficient and safe radiotherapy for oral cancer. In this work, we prepared Tween-20-modified BiVO4 nanorods (Tw20-BiVO4 NRs) and further used them in the radiotherapy of human tongue squamous cell carcinoma. Tw20-BiVO4 NRs are promising radiosensitizers, which can generate a large number of free radicals under X-rays, leading to the damage of cancer cells and thus playing a role in tumor therapy. In cell experiments, radiotherapy sensitization of Tw20-BiVO4 NRs significantly enhanced the production of free radicals in oral cancer cells, aggravated the destruction of chromosomes, and improved the therapeutic effect of radiotherapy. In animal experiments, the strong X-ray absorption ability of Tw20-BiVO4 NRs makes them effective contrast agents in computed tomography (CT) imaging. After the tumors are located by CT imaging, it helps to apply precise radiotherapy; the growth of subcutaneous tumors in nude mice was significantly inhibited, confirming the remarkable effect of CT imaging-guided radiotherapy.
研究领域:
肿瘤学
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放射学
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纳米技术
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2015
·
IF 2.752
Xiaokun Wang,Yingqin Wei,Shasha Wang,Lingxin Chen
In this work, a simple “red-to-blue” colorimetric method for highly sensitive and selective determination of Cr (III) and Cr (VI) was presented, which was based on the aggregation of Tween 20-stabilized gold nanoparticles (Tween 20-Au NPs). This strategy relied upon the distance-dependent optical properties of gold nanoparticles (Au NPs), strong chelating between Cr (III) and citrate, and the reduction of Cr (VI) to Cr (III) by ascorbic acid (AA). Cr (III) could chelate with citrate to form a stable Cr (III)-citrate complex and thereby induce the aggregation of Tween 20-Au NPs. Thus, the sensing of Cr (III) and Cr (VI) based on aggregation of Au NPs was developed with the color of the Au NPs changing from red to blue, which was readily seen by the naked eye. The color change and surface plasmon resonance (SPR) absorption were used to monitor Cr (III) and Cr (VI) levels. Under the optimal assay conditions, good linear relationship was obtained, and the detection limit of Cr (III) and Cr (VI) were 0.016 μM and 0.009 μM in standard aqueous solution, respectively. Furthermore, the colorimetric method exhibited a good selectivity over other metal ions and was successfully applied to detect Cr (III) and Cr (VI) in real water samples.
研究领域:
分析化学
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环境科学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
·
2021
·
IF 3.205
Manman Wang,Zheyan Chen,Xiaofeng Jing,Huan Zhou,Ying Wang,Jiannong Ye,Qingcui Chu
Low-molecular-weight thiols are widely present in human fluids, and are regarded as a kind of potential broad-spectrum evaluation indicators for some clinical diseases. In this work, gold nanoparticles capped with Tween 20 were used for purification and microextraction of the main free thiols (cysteine, homocysteine, glutathione and methionine) in saliva based on Au-S bond formation. Ultrasound further sped up the releasing of the target analytes, and the releasing time needed was only 10 min, and the required sample volume was only 40 µL. The desorption solution could be directly injected for electrophoretic analysis without derivatization , and field-amplified sample stacking of electrophoretic online enrichment technology further improved the detection sensitivity. The synergistic enrichment effect made the enrichment factors of four analytes reach 1119–2067 times. This developed method was applied for the analyses of saliva samples of healthy volunteers. Acceptable sensitivity (LODs: 0.15–1.5 ng mL −1 ) and recoveries (97.6–116%) were obtained in the saliva sample matrix. This proposed method provides an alternative for the sensitive detection of low-molecular-weight thiols in noninvasive body fluids, which has potential application prospect in the preliminary noninvasive diagnosis of diabetes, cardiovascular diseases, etc.
研究领域:
分析化学
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医学诊断
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纳米技术
✓ 已验证
DOI
高影响因子
FOOD HYDROCOLLOIDS
·
2021
·
IF 9.147
Weiyi Zhang,Junmeng Lu,Xue Zhao,Xinglian Xu
The structures of proteins on the interface of oil-in-water emulsions that influence the interfacial film strength are significant to the emulsions stabilization. It is expected that the interfacial protein could be fully recovered based on the competitive displacement of low-molecular surfactant, when the recovery approach and relative parameters are optimized, so that the structural properties of interfacial proteins can be evaluated to clarify their adsorption behaviour and film forming mechanism. In the present study, an optimized and efficient approach to fully recovering interfacial myofibrillar protein (MP) was established by optimizing protein concentration, Tween-20 concentration and different accelerating treatments (agitation or freeze-thawing), for interface-induced structural changes analysis. It was found that the interfacial MP in 2.5 mg/ml protein-stabilized emulsion could be fully recovered in 96 h with 4% (v/v) Tween-20 under agitation treatment. Freeze-thawing treatment could accelerate the desorption process by which interfacial MP in the above emulsion could be fully recovered in 3 cycles with 2% or 3% (v/v) Tween-20 but might cause damage to the MP structure. Based on the established recovery approach, it was concluded that the tertiary structure of interfacial MP unfolded to expose hydrophobic residue branch for interfacial adsorption and film formation, which further caused aggregation of desorbed MP through hydrophobic interaction. While the α-helix decreased due to interface-induced denaturation and the β-sheet increased to improve protein-protein interaction on the interface. These results provided an optimized strategy to analyze interfacial protein structure.
研究领域:
食品科学
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蛋白质化学
✓ 已验证
产品关联
DOI
高影响因子
Asia-Pacific Journal of Chemical Engineering
·
2016
·Vol. 11
·期 5
·673-682
·
IF 0.728
Rui Li,Zhaoliang Wu,Yanji Wang,Linlin Ding,Wei Liu
Prevention of irreversible aggregation of whey soy proteins (WSP) in their foam fractionation from soy whey wastewater is important for achieving their large-scale recovery. For effectively preventing the irreversible aggregation of WSP, this work studied its dependencies on the WSP enrichment ratio and the height of the collected foam which freely collapsed. The results show that most insoluble aggregates formed in the desorption of WSP from the gas–liquid interface, and their formation was closely related to their high local enrichment in the foam. Based on the above results, a chemical defoaming agent with 25% Tween 20 was developed to reduce the relative content of insoluble aggregates in the foamate and the decrease reached about 80%, compared to the case without Tween 20. The prevented irreversible aggregation effectively improved food-related properties of the WSP product. Copyright © 2016 Curtin University of Technology and John Wiley & Sons, Ltd.
研究领域:
食品科学
·
蛋白质工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2018
·
IF 4.513
Hui-Bo Qin,Yi-Le Du,Yu Zhang,Xiao-Qin Wang,Zhen-Feng Sun,Chang-Yu Sun,Guang-Jin Chen,Lan-Ying Yang,Zhi Li
The toxicity of hydrate inhibitors used in the field has attracted more attention. A natural material, i.e. , whey protein, was assessed to act as kinetic hydrate inhibitors (KHIs) in a sapphire cell and an autoclave equipped with particle video microscope (PVM) and focused beam reflectance measurement (FBRM) probes. The pressure dropping method was utilized to estimate the hydrate induction time, and the results demonstrate that the hydrate inhibition performance of whey protein is superior to that of the commercial KHI, polyvinylpyrrolidone. The induction time for the pure water system was found to increase linearly with the increase in the dosage of whey protein until it reached approximately 2.5 wt%. As it is usually inevasible to apply KHIs under conditions of high water contents , the feasibility of whey protein as a KHI in the (oil + water) system with and without an emulsifier of Tween 20 was evaluated. A small amount of oil was found to have no obvious influence on the induction time for the system with whey protein under the circumstances without the addition of emulsifier. When Tween 20 was added, the induction time obviously increased under the same operating conditions, which could be attributed to the emulsifier–protein interactions in aqueous solutions. The oil drops decrease and are distributed more evenly with the increasing dosage of Tween 20 under the PVM and FBRM probes measurement. Additionally, the particles decrease during the hydrate formation process. This work presents a natural KHI and gives the inhibition discipline in a high-water-content system.
研究领域:
化学工程
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环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Sijun Huang,Liqiang Yu,Kun Zhang,Jiachen Lv,Henglong Xiang,Dongwei Zhu,Huan Li,Shuning Zhang,Xinyu Liu,Ying Wang,Yi Guo,Li Xu
The spontaneous adsorption of proteins onto nanoparticles, known as the protein corona, provides a unique perspective for designing protein-sensing biosensors. This study proposes a tailored protein corona method mediated by Tween-20 and develops a reverse-capture approach for protein quantification assays. The protein-coated microplate captures titanium dioxide nanosheets (TiO 2 -NS) in a phosphate buffer containing Tween-20 and generates fluorescence signals via the photocatalytic reduction of resazurin to resorufin, thereby indicating the amount of protein. The linear range of the current assay was 0.5–5 ng/mL, and the limit of detection (LOD) was 0.28 ng/mL, which is 100–1000 times more sensitive than the classical colorimetric methods. This method is suitable for the determination of proteins in artificial urine and has broad potential for practical applications.
研究领域:
生物化学
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分析化学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 44
·26059-26066
·
IF 3.119
Shuwei Liu,Lu Wang,Bin Zhao,Ze Wang,Yinyu Wang,Bin Sun,Yi Liu
In clinical tumor therapy, traditional treatments such as surgery, radiotherapy and chemotherapy all have their own limitations. With the development of nanotechnology, new therapeutic methods based on nanomaterials such as photothermal therapy (PTT) have also emerged. PTT takes advantage of the poor thermal tolerance of tumor cells and uses the heat generated by photothermal reagents to kill tumor cells. A transition metal sulfide represented as Cu2S is an ideal photothermal reagent because of its easy preparation, high extinction coefficient and photothermal conversion efficiency. Surface modification of nanoparticles (NPs) is also necessary, which not only can reduce toxicity and improve colloidal stability, but also can provide the possibility of further chemotherapeutic drug loading. In this work, we report the fabrication of Tween-20 (Tw20)-modified and doxorubicin (Dox)-loaded Cu2S NPs (Cu2S/Dox@Tw20 NPs), which significantly improves the performance in tumor therapy. Apart from the enhancement of colloidal stability and biocompatibility, the drug loading rate of Dox in Tw20 reaches 11.3%. Because of the loading of Dox, Cu2S/Dox@Tw20 NPs exhibit chemotherapeutic behaviors and the tumor inhibition rate is 76.2%. Further combined with a near-infrared laser, the high temperature directly leads to the apoptosis of a large number of tumor cells, while the release of chemotherapeutic drugs under heat can not only continue to kill residual tumor cells, but also inhibit tumor recurrence. Therefore, with the combination of PTT and chemotherapy, the tumor was completely eliminated. Both hematological analysis and histopathological analysis proved that our experiments are safe.
研究领域:
纳米技术
·
肿瘤学
·
药学
·
生物医学工程
✓ 已验证
DOI
PubMed
高影响因子
Analytical Methods
·
2020
·Vol. 12
·期 11
·1469-1477
·
IF 2.596
Huihui Liu,Zeyu Gan,Chao Song,Binbin Xu,Zhiyong Guo,Xi Zhou,Zhiwei Chen
In this work, we designed a simple and intelligent method to detect cyromazine. After original citrate stabilized AuNPs were modified with Tween 20, they could remain stable under complex conditions of different pH values (5.5–8.0) and high ionic strength. However, after the addition of cyromazine, ligand exchange occurred with the citrate ion on the surface of Tween 20–AuNPs, resulting in instability and aggregation of Tween 20–AuNPs. At the same time, a new absorption peak appeared near 630 nm, and the color changed from red to blue. This method has been successfully applied to the detection of cyromazine in milk and cucumber. Furthermore, this method was used in conjunction with a smartphone to intelligently detect and analyze cyromazine at concentrations as low as 0.04 mg kg−1.
研究领域:
分析化学
·
食品科学
·
环境监测
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Food Engineering
·
2024
·Vol. 20
·期 6
·439-449
·
IF 1.6
Wenxin Jiang,Hefan Zhang,Xinwei Xiong,Fengting Li,Wei Lu,Bing Hu,Zhiming Gao,Yuehan Wu,Dan Yuan,Yanlei Li
Using non-amphiphilic polysaccharide to stabilize oil-in-water emulsions is still a challenge in food industry. Polysaccharide microgels showed emulsifying capacity, however, the stability of the formed emulsions is far from the requirements of the food industry. In this work, agarose microgel/Tween-20 suspensions were prepared and further employed in oil-in-water emulsion stabilization. Focuses were taken on the impact of Tween-20 on the emulsifying properties of agarose microgels. Results suggested that Tween-20 could complex with agarose microgels, and microamounts of Tween-20 (0.02 wt%) could apparently improve the emulsifying performance of microgels. Dynamic interfacial pressure and interfacial adsorption of microgels indicated that appropriate amount of Tween-20 (≤0.04 wt%) could benefit the interfacial adsorption of agarose microgels, while excessive Tween-20 (≥0.08 wt%) could compete with agarose microgels for adsorption sites on oil/water interface. Results of this work supporting that surfactant complexing could be a promising solution to prepare polysaccharides based Mickering emulsions.
研究领域:
食品科学
·
高分子化学
·
界面科学
✓ 已验证
产品关联
DOI
高影响因子
FOOD HYDROCOLLOIDS
·
2021
·
IF 9.147
Junmeng Lu,Xinglian Xu,Xue Zhao
In the current study, the interfacial rheological properties of alkali pH-shifted MP under pH 11.0 → 7.0, pH 11.5 → 7.0 and pH 12.0 → 7.0 have been firstly investigated. The molecular weight and microstructure of myofibrillar protein (MP) treated by alkali pH-shifting were investigated by gel-permeation chromatography (GPC) and transmission electron microscopy (TEM). Results indicated a swollen, organized and aggregated structure of refolded MP. Overall, the molecular change in refolded MP led to faster protein adsorption towards the O/W interface, enhanced intermolecular interaction between adsorbed proteins and improved elasticity of interfacial film compared to native MP. After β-mercaptoethanol (β-ME) was added, the advantage of refolded MP in diffusion phase no more existed due to the disruption of aggregation and decreased molecular size, besides the penetration and rearrangement were interfered because the disruption of disulfide bond inhibited the formation of interfacial protein layers. With the protein concentration increasing, MP molecules crowding at O/W (oil in water) surface limited the development of a highly elastic network. As revealed by Tween 20 displacement, MP layers with higher interfacial elasticity were more resistant to displacement. Moreover, after displacement the coalescence stability of emulsion droplet was enhanced but the mechanical strength of interfacial MP layer was reduced. Altogether MP (0.04 or 0.2 mg/mL) treated by pH 11.0 → 7.0 exhibited the best adsorption performance and interfacial properties, which were important in stablizing emulsions. Thus, interfacial behavior regulation by alkali pH-shifting may be a applicable process for developing meat protein-based emulsions in food industry.
研究领域:
食品科学
·
蛋白质化学
·
胶体科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）