STARCH-STARKE
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2020
·
IF 2.226
Xiaodong Bai,Xuepeng Zhang,Yuqian Xu,Xuemei Yong
A graft copolymer is synthesized with graft copolymerization of acrylamide (AM) and 1-vinyl-2-pyrrolidone (NVP) grafting onto sodium carboxymethyl starch (CMS) via central composite design (CCD). The initiation system consists of potassium persulfate (KPS) and sodium hydrogen sulfite (SBS). The copolymer is confirmed by infrared spectroscopy, nuclear magnetic resonance hydrogen spectroscopy, scanning electron microscopy, thermogravimetric experiment, and elemental analysis. The rheological performance, filtration loss, cake thickness, and cake fictional coefficient of the drilling mud containing copolymer are evaluated. The results show that copolymers have ability to thicken and reduce filtration volume and have no obvious influence on the thickness and fictional coefficient of the mud cake. Response surface methodology (RSM) is exerted for variable evaluation and optimization. The results indicate that initiator concentration is the main contributing factor to decrease filtration volume and the optimum results are 1.5 wt% (initiator concentration), 1.82 (mole ratio of monomer to starch [AGU]), 66.02 °C (reaction temperature), 3.87 h (reaction time). The predicted value and the actual experimental value are 8.64 and 9 mL respectively with an error of 4.01%. The small error indicates that there is a small deviation between the actual and the predicted values, which also shows that the model is reasonable.
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高影响因子
STARCH-STARKE
·
2020
·
IF 2.226
Yadi Huang,Juan Wu,Shengsong Deng,Fenghe Li,Xialing Bian,Xiaowen Li,Risheng Yao
Polymer nanoparticles have made progress in pharmaceutical nanotechnologies due to their efficient drug delivery. However, considerable amounts of surfactant are required during polymerization, which inevitably brings some potential problems. Herein, template polymerization is utilized to synthesize polyacrylic acid/soluble starch (PAA/SS) complex nanoparticles by surfactant-free polymerization. As a template, soluble starch (S-starch, SS) nanoparticles are obtained by nanoprecipitation due to their polyhydroxy structure. The resultant complex nanoparticles with pH sensitivity have core–shell structures, which facilitates their use as nanoparticles in preparation of gelatin-like materials. Another interesting property of PAA/SS complex nanoparticles is that the SS template can be removed by α-amylase, then PAA nanocapsules are obtained. A hypothesis for the mechanisms of PAA/SS complex nanoparticles formation and PAA nanocapsules preparation with α-amylase is also proposed.
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高影响因子
STARCH-STARKE
·
2020
·
IF 2.226
Junhui Li,Lei Tian,Yizhou Fang,Wenwei Chen,Guangrong Hunag
As an energy-saving and effective physical method, ultrasound technologies are gaining research attention for the production of modified starches. Corn starch–caffeic acid complexes are prepared via ultrasound process, and the effect of ultrasound power on the physicochemical properties and in vitro digestion of the complexes is investigated. The results of Fourier-transform infrared spectroscopy and the amount of complexes analysis indicate that ultrasound can help with the formation of starch–caffeic acid complexes, and the amount of caffeic acid in complexes depended on the ultrasound power. Scanning electron microscopy shows starch–caffeic acid complexes exhibit obvious dense network structure with increasing ultrasound power. X-ray diffraction results indicate the presence of V-type crystalline polymorph between starch and caffeic acid under high power of ultrasound irradiation. The starch–caffeic acid complexes can significantly inhibit the swelling power of starch granules at high temperature and increase the solubility of starch granules. Furthermore, the in vitro digestion of starch–caffeic acid complexes is estimated, and the result shows that the resulting complexes from ultrasound have lower digestion properties. Taken together, it is proposed that ultrasound technology is an effective method for preparation of starch complexes with potential as a functional food and drug delivery system.
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高影响因子
STARCH-STARKE
·
2020
·
IF 2.226
Xue-Li Liu,Kun Zhang,Yu Hu,Zhengjuan Zhang,Jun Chen,TianLin Ma,JiaJia Wang
A new class of hydroxypropyl starch, γ-hydroxypropyl starch (γ-HPS), is synthesized by using 3-chloropropanol as the etherifying reagent. Two independent procedures for the determination of the number of moles of alkylene oxide combined per anhydroglucose unit (molar substitution, MS) in γ-HPS are described. The feasibility of the Zeisel-gas chromatographic technique and colorimetric determination are testified, and especially in the second approach, the stability and accuracy of dehydration process are also investigated. The concentrated sulfuric acid dehydration oxidation is replaced with 2-iodoxybenzoic acid oxidation while retaining the same acid degradation and the same ninhydrin color reaction. Furthermore, the reliability and the range of application of the methods are tested by analyzing three samples of γ-HPS and unmodified starch derivatives, and the results indicate that values of MS are in good agreement with each testing method.
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高影响因子
Journal of Biomedical Nanotechnology
·
2014
·Vol. 10
·期 8
·1627-1634
·
IF 7.578
Zhao Jing,Wang Yajing,Luan Libiao
The purpose of this work was to develop a novel picropodophyllin-loaded micelle-like nanoparticle with a biodegradable amphiphilic star-shaped polycaprolactone-polyethyleneglycol copolymer (S-PCL-PEG). S-PCL-PEG was synthesized using star-shaped polycaprolactone (S-PCL) as a hydrophobic
block and monomethoxy polyethyleneglycol (PEG) as a hydrophilic block and characterized by 1H-NMR. It was confirmed by the pyrene fluorescence probe method that the obtained S-PCL-PEG could form micelles through self-assembly in aqueous media. In addition, picropodophyllin (PPP),
a hydrophobic anticancer drug, could be entrapped in the hydrophobic inner core of the micelles using the thin film hydration method, forming PPP-loaded micelle-like nanoparticles (PPP-NPs). PPP-NPs had a high encapsulation efficiency of greater than 90%, an average size of 90–110 nm
with a symmetrical monodisperse distribution and a zeta potential of –18 mV. Additionally, in vitro release tests showed that approximately 70% of the drug was released from PPP-NPs into PBS (pH 7.4) containing 0.2% Tween 80 at 37 °C for 96 h, and the drug release data fit
well to the Higuchi equation. Furthermore, an in vitro tumor cell growth inhibition assay showed that the IC50 values of the PPP solution and PPP-NPs against SMMC7721 liver cancer cell lines were 0.4 μg/ml and 0.2 μg/ml respectively, which indicated that
the cytotoxicity of PPP-NPs against tumor cells was greater than that of the PPP solution. In conclusion, S-PCL-PEG micelle-like nanoparticles loaded with PPP have a promising future for administration by injection.
研究领域:
药剂学
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生物材料
·
肿瘤学
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高影响因子
Journal of Food Measurement and Characterization
·
2024
·
IF 2.9
Huang Zhiwu,Peng Qiang,Luo Xiaomin,Bi Yongguang,Kong Fansheng,Wang Zhong,Tan Shaofan,Zhang Junyong
Protein-stabilized star anise essential oil nano-emulsion (SAEO-NE) was successfully prepared using an ultrasound-assisted method to address the intrinsic defects and enhance the bioavailability of star anise essential oil (SAEO). In this study, the polydispersity index (PDI), particle size, and zeta potential (ZP) of SAEO-NE were used as performance indicators, and the optimal preparation conditions were determined to be an emulsifier dosage of 5%, an ultrasonic power of 270 W, and an ultrasonic time of 15 min. Transmission electron microscopy (TEM) and dynamic light scattering (DLS) analyses revealed that the resulting nanoparticle exhibited a uniform spherical shape, with a particle size of 246.5 ± 1.35 nm and a ZP of -38.97 ± 0.45 mV. Rheological analyses further confirmed the favorable rheological characteristics of the nano-emulsion. Moreover, SAEO-NE demonstrated robust adaptability across varying salinities (100, 200, 300, and 400 mM) and pH levels (1, 3, 5, 7, 9). After storage at 4 °C for 5 weeks, the nano-emulsion maintained particle sizes below 300 nm, indicating excellent storage stability. In addition, the in vitro antioxidant evaluation showed that SAEO exhibited enhanced antioxidant activity after nano-emulsification.
研究领域:
食品科学
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纳米技术
·
生物学
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高影响因子
PLANT PHYSIOLOGY AND BIOCHEMISTRY
·
2024
·
IF 6.1
Bingyao Jiang,Jia Yang,Xingyu Zhong,Shuo Yan,Meizhen Yin,Jie Shen,Bin Lei,Zhaohu Li,Yuyi Zhou,Liusheng Duan
Plant Growth Regulators (PGRs) are functional compounds known for enhancing plant growth and development. However, their environmental impact is a concern due to poor water solubility and the need for substantial organic solvents. Recently, nano-delivery systems have emerged as a solution, offering a broad range of applications for small molecule compounds. This study introduces a nano-delivery system for Triacontanol (TA), utilizing a star polymer (SPc), aimed at promoting maize growth and improving physiological indicators. The system forms nearly spherical nanoparticles through TA's hydroxyl group and SPc's tertiary amine group. The TA/SPc nano-complex notably outperforms separate TA or SPc treatments in maize, increasing biomass, chlorophyll content, and nutrient absorption. It elevates chlorophyll content by 16.4%, 10.0%, and 6.2% over water, TA, and SPc treatments, respectively, and boosts potassium and nitrate ion uptake by up to 2 and 1.6 times compared to TA alone, leading to enhanced plant height and leaf growth. qRT-PCR analysis further demonstrated that the nano-complex enhanced cellular uptake through the endocytosis pathway by up-regulating endocytosis-related gene expression. The employment of TEM to observe vesicle formation during the internalization of maize leaves furnishes corroborative evidence for the participation of the endocytosis pathway in this process. This research confirms that SPc is an effective carrier for TA, significantly enhancing biological activity and reducing TA dosage requirements.
研究领域:
农业科学
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纳米技术
·
植物生理学
·
分子生物学
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PubMed
高影响因子
Biomimetics
·
2025
·Vol. 10
·期 6
·368
·
IF 3.9
Lei Feng,Liugen Xu,Junhao Wen,Minghai Zhao,Amjad Ali,Naushad Ahmad,Jianwei Lu,Li Guo
Developing safe and efficient cryoprotectants is critical for effective cryopreservation in biomedical applications. Inspired by natural antifreeze proteins (AFPs), a series of linear and star-shaped peptoids featuring isopropanol side chains to mimic the amphiphilic characteristics of threonine were prepared. The effects of chain length and molecular topology on antifreeze properties were systematically investigated. Both ice recrystallization inhibition (IRI) and ice crystal growth suppression improved with increasing chain length, and star-shaped peptoids exhibited superior performance. Notably, the star-shaped peptoid S-(A6)3demonstrated excellent antifreeze activity and low cytotoxicity, highlighting its promise as a novel, non-toxic alternative to conventional cryoprotectants like DMSO. These findings provide valuable insight into the structure-property relationship of peptoids for cryopreservation applications.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2025
·
IF 3.9
Qi Lun,Tu Dan,Shi Yu,Liu Jingjing,Zhao Xinyuan,Xu Jianhua,Yang Yajie,Yang Wenyao
Zeolitic imidazolate frameworks (ZIFs) have greatly attracted attention in supercapacitors research due to their porosity and structural controllability. In this paper, a series of Co–nitrogen carbon (Co–NCs) were obtained via a facile one-step calcination process using 3D star-shaped Co–ZIF as a precursor. The energy storage mechanism is analyzed and it is concluded that Co–NCs show excellent capacitance and cycling stability, attributed to its star-shaped porous morphology and high pseudocapacitance contribution. The optimized Co–NCs/550 exhibits a specific capacity of 825 F g −1 at a current density of 0.1 A g −1 , and a highly stable cycling performance over 5000 cycles at a current density of 2 A g −1 . This work provides a practical strategy for designing stable electrode for high-performance supercapacitors.
研究领域:
材料科学
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电化学
·
纳米技术
·
储能
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高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2024
·
IF 3.2
Yunchao Ma,Shengnan Qi,Yuxin Yao,Chuanxue You,Chunbo Liu,Baixiang Ren
Covalent organic frameworks (COFs) are widely used for gaseous radioiodine capture through distinctive properties. Herein, 2D fluorinated imine COF (JLNU-316) was designed and constructed in this study. JLNU-316 exhibited large BET surface area of 596.25 mg 2 /g and pore size (2.74 and 3.78 nm), excellent thermal and chemical stability. The adsorption of iodine by JLNU-316 reached 4.08 g/g, which exceeded most of the current fluorine-containing porous iodine adsorption materials. Furthermore, the iodine adsorption capacity remains at 99 % after seven days of exposure to air conditions, and JLNU-316 maintains stable performance following ten cycles. The introduction of heteroatoms enhanced the stability of JLNU-316 and enriched the adsorption sites, thereby increasing the iodine adsorption capacity. This study guides for the design and preparation of novel iodine adsorbents.
研究领域:
材料科学
·
环境科学
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高影响因子
Polymers
·
2019
·Vol. 11
·期 10
·1574
·
IF 3.164
Yuanjie Wang,Xinzhi Liu,Liying Liu,Hui Niu
In this work, a series of isotactic-polypropylene/atactic-polystyrene (iPP/aPS) miktoarm star copolymers, PxSy, was synthesized via an arm-first approach. Varied star macromolecule architectures were fabricated by designing the arm length and the arm numbers (x and y). These miktoarm stars were able to form micelles in selective solvent (N,N′-dimethylformamide (DMF)), in which the insolubleiPP arms formed the core and the solubleaPS arms formed the shell. The miktoarm polymers aggregated to micro-nanoscale binary structures (MNBSes) in the casting process, and their morphologies, including the MNBS shape and size, were greatly influenced by the PxSyarchitectures. The MNBSes endowed the material surface with superhydrophobic performance with a water contact angle of 157.0° and a sliding angle of 1.5°.Keywords:miktoarm star copolymer;isotactic-polypropylene;atactic-polystyrene;aggregation morphology
研究领域:
高分子化学
·
材料科学
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高影响因子
POLYMER BULLETIN
·
2015
·Vol. 72
·期 11
·2949-2965
·
IF 1.438
Ren Qiang,Xiang Yanli,Huang Chunyan,Li Jian,Wang Chengyi
A novel epoxy resin toughener based on star-shaped copolymer of butyl acrylate (BA) and glycidyl methacrylate (GMA) [poly (BA- co -GMA)] with low viscosity was developed. The star polymers were synthesized by initiators for continuous activator regeneration atom transfer radical polymerization (ICAR ATRP) using tri, tetra and hexa-functional initiators. The branching parameters of star poly (BA- co -GMA) were characterized by gel permeation chromatography with a laser light scattering-viscometry triple detection system. Copolymer composition and glass transition temperatures of the copolymers were analyzed by proton nuclear magnetic resonance ( 1 H-NMR) and differential scanning calorimetry (DSC), respectively. The results showed that the branching ratio decreased as the number of arms increased. The epoxide groups of the GMA units were kept intact during ICAR ATRP. Rheological, mechanical tests and dynamic mechanical analysis revealed that star poly (BA- co -GMA)/diglycidyl ether of bisphenol A (DGEBA) epoxy resin formulation exhibited better processability, higher impact resistance and thermal resistance than those of linear poly (BA- co -GMA)/DGEBA epoxy resin formulation.
研究领域:
高分子科学
·
材料科学
·
化学工程
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高影响因子
危险品化学品经营许可证（带存储）