SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2020
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IF 3.232
Mei-Xiang Yang,Qing Tang,Mei Yang,Qin Wang,Zhu Tao,Xin Xiao,Ying Huang
The host–guest inclusion complexes that comprise an inverted cucurbit[7]uril ( i Q[7]) and a quinoline derivative, 4-(4-dimethylaminostyryl) quinoline (DSQ) at different pHs were exploited as multiple supramolecular sensors to sense l -α-amino acids. DSQ complexation inside i Q[7] at different pHs leads to increased fluorescence and formation of different-colored i Q[7]-DSQ complexes. The enhanced fluorescence of DSQ after i Q[7] encapsulation may be attributed to limited dimethylamine rotation and the formation of a twisted internal charge transfer (TICT) state. The DSQ@ i Q[7] sensors have different affinities for l -α-amino acids at different pHs. Therefore, we propose a pH-stimulus response supramolecular sensor for the discrimination of structurally similar l -α-amino acids in aqueous solution.
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JOURNAL OF SURFACTANTS AND DETERGENTS
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2020
·Vol. 23
·期 2
·263-271
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IF 1.654
Longyin Qiao,Wanjing Zhang,Libo Xu,Fu Han,Yawen Zhou,Baocai Xu
A series of Gemini surfactants N,N″-dialkyl-N,N′,N″-tripropionate diethylenetriamine (referred as DTPDT-n, where n is the length of the hydrocarbon chain, n = 10, 12, 14) were synthesized, which have three carboxylic head-groups and two hydrophobic alkane chains. The products were characterized by means of nuclear magnetic resonance and mass spectrometry. The physicochemical properties of DTPDT-n surfactants with different hydrocarbon chain lengths were studied such as isoelectric point, surface activities, emulsifying properties, and foam properties. It is showed that these compounds exhibit pH-dependent protonation-deprotonation behavior. The isoelectric points of DTPDT-n surfactants are between 3.40 and 10.90. The critical micellar concentration ( cmc ) of all three surfactants are lower than the corresponding monomeric surfactants (single head group, single-chain), especially DTPDT-14, whose cmc can reach 2.29 × 10 −5 mol/L. With an increase in the length of the alkyl chain, the solubility of the surfactants decreases and the surface tension of the three surfactants at cmc increases. In consideration of pH, all of three surfactants appear better emulsifying capacity and foaming property under weak alkaline conditions. DTPDT-14 has the best performance of emulsifying capacity among the three surfactants. DTPDT-10 has excellent foaming ability and foam stability.
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2020
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IF 4.192
Zhaolan Zhai,Shengfeng Ye,Xinyan Yan,Zhanqian Song,Shibin Shang,Xiaoping Rao,Jie Song
A novel pH-responsive wormlike micellar viscoelastic solution was constructed by a rosin-based anionic surfactant (Na-MPA-AZO-Na) in the presence of cetyltrimethylammonium bromide (CTAB). The viscoelasticity, aggregate morphology, and pH-responsiveness of the pH-responsive wormlike micelles have been investigated through the method of rheology and cryogenic-transmission electron microscopy. Its corresponding mechanism has been studied using 1H NMR and 1H–1H 2D NOESY HNMR. The zero-shear viscosity (η0) of the wormlike micellar solution rapidly decreases by 3 orders of magnitude as the pH increases from 5.21 to 9.56. The viscoelastic fluids and water-like solutions can be converted by tuning the pH between 3.62 and 12.00, and the corresponding aggregates also transform between wormlike micelles and spherical micelles. In addition, the wormlike micellar cross-sectional diameter is approximately 10 nm, which is remarkably larger than that of the common wormlike micelles. The phenomenon can be attributed to the large steric volume of the rosin rigid skeleton. When the pH is 12.00, a “pseudo” Gemini surfactant is constructed by Na-MPA-AZO-Na and CTAB through the electrostatic interactions. Wormlike micelles also can be formed with the increasing concentrations. The η0 of the wormlike micellar system shows strong dependence on concentration with an exponent of 9.6 (η0 ∝ C9.6). This work further promotes new applications of forest resources.
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JOURNAL OF SURFACTANTS AND DETERGENTS
·
2020
·Vol. 23
·期 5
·863-872
·
IF 1.654
Xuepeng Wu,Jianwu Zhen,Bitao Song,Shuyang Gao,Zhaohui Song,Junbin Jin
A pH-responsive amphiphilic surfactant stearic amide 3-(N , N-dimethylamino)propylamide (SAA) was synthesized and served as a thickener in aqueous solution to construct a switchable viscoelastic surfactant fluid (VES fluid). The structure of SAA was studied by 1 H NMR, and the viscoelastic behavior of VES fluid was studied in detail by rheological measurements. The viscosity of this VES fluid can be switched reversibly from low to high immediately by adjusting system pH value. Even at high shear rate (170 s −1 ) and high temperature (90 °C), excellent viscoelastic behavior of this VES fluid can be observed, which is a key performance for fracturing applications. Meanwhile, the recycled VES fluid can still maintain good pH-responsive behavior even after more than three cycles. These unique performances of this VES fluid not only enhanced our understanding of the transformation of wormlike micelles at high temperature, but also enriched a large potential of VES fracturing fluid in the development of oil and gas reservoirs.
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Micro & Nano Letters
·
2020
·Vol. 15
·期 5
·291-295
·
IF 0.975
Liang He,Xueyan Nan,Tong Wang,Pengli Bai
In this work, a novel glutathione and pH serial dual-responsive drug delivery system has been developed, which was constructed with chitosan (CS), carbon dots (CDs) and hyaluronic acid (HA) modified the mesoporous silica nanoparticles (MSNs). The system showed excellent drug loading efficiency, controlled release and targeted delivery. In addition, the platform (MSN-CS@HA-CDs) exhibited fluorescence imaging property. The prepared drug delivery system appeared to be a promising cancer treatment platform.
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EUROPEAN POLYMER JOURNAL
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2019
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IF 3.621
Shangji Li,Wei Dai,Zheng-Zhi Yin,Jun Gao,Datong Wu,Yong Kong
The past decades have witnessed the development of mesoporous silica as an attractive carrier for controlled drug delivery due to its outstanding mesoporous feature, facile surface functionalization and good biocompatibility. In this work, NH 2 grafted mesoporous silica nanoparticles (NH 2 -MSN) were first synthesized for the loading of 5-fluorouracil (5-FU), and then the drug loaded NH 2 -MSN were coated with oxidized pullulan (oxPL) via Schiff base reaction for the encapsulation of 5-FU. The resultant drug carrier, 5-FU/MSN/oxPL, was fully characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Dynamic light scattering (DLS), 1 H NMR, Fourier transform infrared (FT-IR) spectroscopy and nitrogen adsorption/desorption isotherms, respectively. Finally, controlled delivery of 5-FU from the carrier was investigated. Since the acylhydrazone bond between MSN and oxPL is prone to be hydrolyzed under acidic conditions, the encapsulated 5-FU is easily released from the MSN/oxPL carrier in acidic environment due to the separation of oxPL coating from MSN. Cytotoxicity of the developed carrier was also evaluated using LO2 and HepG2 cell lines by conventional CCK-8 assay.
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BIOSENSORS & BIOELECTRONICS
·
2019
·
IF 9.518
Weiqing Xu,Lei Jiao,Huarong Ye,Zhenzhong Guo,Yu Wu,Hongye Yan,Wenling Gu,Dan Du,Yuehe Lin,Chengzhou Zhu
Estrogen receptor (ER), progesterone receptor (PR), and human epidermal growth factor receptor-2 (HER2) are the three crucial biomarkers for the clinical diagnosis of breast cancer. Sensitive and precise detection of ER, PR, and HER2 is of great significance for the diagnosis of breast cancer. Herein, through a simple solvent-induced self-assembly process, the self-carried allochroic nanoparticles were prepared by using some hydrophobic pH indicator molecules for allochroic NPs-linked immunosorbent assay (named ALISA) of ER, PR, and HER2, respectively. Meanwhile, the introduction of bovine serum albumin (BSA) and antibody (Ab) enhanced the dispersity of the self-assembled nanoparticles as signal tags. Since the ultra-high loading and high-efficiency release of pH indicators, the ALISA exhibitssatisfactory selectivity and sensitivity, which demonstrated the great potential in the early diagnosis and postoperative monitoring of breast cancers. Furthermore, the smartphone was introduced to combine with the ALISA for point-of-care testing, indicating the high feasibility in practical applications.
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Advanced Materials Interfaces
·
2022
·Vol. 9
·期 10
·2102092
·
IF 6.389
Junjun Ma,Yangchun Xie,Tao Yang,Xiaohua He
Innovative 3D materials with the switchable wetting surface attract significant attention due to their application in oil/water separation. Herein, a fast pH-responsive and highly effective melamine foam (MF) grafted with poly (2-dimethylaminoethyl methacrylate) is prepared by surface-initiated chain transfer radical polymerization. The as-prepared MF displays superhydrophilic and superoleophobic surface in strong acid solution while it becomes superhydrophobic in neutral or basic solution. Therefore, it can be rapid to selectively absorb different types of oils from the oil–water mixture with a great absorption capacity of 54–117 g g −1 and automatically desorb oil in less than 60 s with a desorption efficiency of 99% (dichloromethane) in acid solution. Moreover, the as-prepared MF possesses excellent recyclability, and the absorption capacity and the desorption efficiency are almost unchanged after 15 cycles. The pH-sensitive MF with switchable wetting surfaces has great potential for the oily water separation.
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iScience
·
2026
·Vol. 29
·期 10
·117733
·
IF 4.5
Yanlin Wu,Wenyu Yang,Yilan Zeng,Dingfeng Huang,Wenbo Dong,Olivier Monfort,Martin Motola
Natural resveratrol can assist Fe(III)-mediated PDS activation • RES promotes Fe(III) reduction and supports Fe(III)/Fe(II) cycling • Balanced RES concentration improves redox cycling while limiting radical competition • Near-neutral OFL degradation is achieved without additional pH adjustment Summary Iron-mediated peroxydisulfate (PDS) activation is limited by slow Fe(III)/Fe(II) redox cycling under circumneutral conditions. Here, resveratrol (RES), a natural stilbene polyphenol, was introduced as a low-dose redox mediator to promote Fe(II) formation from Fe(III) for enhanced PDS activation. The Fe(III)/RES/PDS system showed higher ofloxacin (OFL) degradation than the corresponding single-reagent and binary systems and achieved approximately 90% OFL degradation at pH 6.5. Chemical quenching and competition-kinetic analysis indicated that sulfate radical (SO 4 ·− ) was the major contributor to OFL degradation, while hydroxyl radical ( · OH) played a secondary role. Matrix experiments showed that Cl − and NO 3 − had minor effects, whereas NO 2 − strongly inhibited OFL degradation. This work provides a case study of RES-mediated Fe(III)/PDS activation for antibiotic degradation under near-neutral conditions. Download: Download high-res image (83KB) Download: Download full-size image
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Small Methods
·
2026
·
IF 8.7
Xi Deng,Zhihui Chen,Shouce Huang,Yueran Dong,Yujian Ding,Zhengyu Han,Jin Zhao,Jingshu Hui
Aqueous zinc-ion batteries are severely hindered by interfacial side reactions including dendrite growth and by-product accumulation, primarily caused by local pH fluctuations at the Zn/electrolyte interface. Here, we propose a dynamic interfacial pH-buffering strategy using glycine (Gly), which simultaneously anchors onto the Zn surface and regulates proton transfer through its reversible acid–base equilibria. In situ pH mapping with an ultramicroelectrode probe directly confirms that Gly effectively suppresses interfacial alkalization and maintains a stable interfacial environment during Zn plating/stripping. Benefiting from this local buffering effect, the Gly-containing electrolyte achieves a Coulombic efficiency (CE) of 99.5% in Zn||Cu cells, stable cycling over 1000 h in symmetric cells, and durable cycling for 2000 cycles in Zn||NaV 3 O 8 full cells. This work establishes interfacial pH stabilization as an important design criterion for electrolyte-additive engineering in aqueous Zn batteries.
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JOURNAL OF FLUORESCENCE
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2023
·
IF 2.7
Liu Yinghua,Duan Wenxiu,Li Huiqing,Wu Jiang,Liu Dan,Mi Jiaying,Qi Shengda,Ren Cuiling,Chen Hongli
Multi-targets detection has obtained much attention because this sensing mode can realize the detection of multi-targets simultaneously, which is helpful for biomedical analysis. Carbon nanoparticles have attracted extensive attention due to their superior optical and chemical properties, but there are few reports about red emission carbon nanoparticles for simultaneous detection of multi-targets. In this paper, a red emission fluorescent carbon nanoparticles were prepared by 1, 2, 4-triaminobenzene dihydrochloride at room temperature. The as-prepared red emission fluorescent carbon nanoparticles exhibited strong emission peak located at 635 nm with an absolute quantum yield up to 24%. They showed excellent solubility, high photostability and good biocompatibility. Furthermore, it could sensitively and selectively response to hypochlorite and pH, thus simultaneous detection of hypochlorite and pH was achieved by combining the red emission fluorescent carbon nanoparticles with computational chemistry. The formation mechanisms of red emission fluorescent carbon nanoparticles and their response to hypochlorite and pH were investigated, respectively.
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2023
·
IF 6.1
Shunyu Xiang,Xiaoyan Wang,Shiqi Peng,Xinke Kang,Jing Wang,Liyuan Peng,Xiaozhou Ma,Jin Huang,Xianchao Sun
The application of antiplant virus agents on leaf surfaces faces challenges due to their vulnerability to wear, instability, and limited duration, which in turn jeopardizes plant health and yield. In recent years, high-aspect-ratio nanomaterials have gained prominence as powerful carriers for disease treatment, thanks to their exceptional penetrability and precise drug delivery capabilities. Here, we synthesized a pH-responsive nanoimmune inducer (CNC-AMO) with strong leaf adhesion through a Schiff base reaction, achieved by grafting amino-oligosaccharides (AMOs) on the surface of aldehyde-based CNC (CNC–CHO). Fourier transform infrared spectrometry, zeta potential, X-ray photoelectron spectroscopy, X-ray diffraction, transmission electron microscopy, atomic force microscopy, scanning electron microscopy, thermogravimetric analysis, and elemental analysis were used to characterize the CNC-AMO. The CNC-AMO displayed the capability for pH-responsive AMO release, showcasing its potential for targeted and controlled delivery. When applied to plants, the CNC-AMO exhibited impressive anti-TMV efficacy during a weeklong observation period. Meanwhile, the CNC-AMO exhibited remarkable adhesion and scouring resistance on the surfaces of the plant leaves. We strongly believe that the synergy of environmentally friendly synthetic materials, efficient plant virus control, and streamlined scalability positions CNC-AMOs as a promising pesticide for plant virus therapy.
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