Analytical Methods
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2014
·Vol. 6
·期 21
·8627-8632
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IF 1.938
Jinjiao Shi,Ligang Chen
In this study, we investigated the possibility of reverse micelles which were used for the determination of rhodamine B in lipsticks followed by high performance liquid chromatography (HPLC). The reverse micelle of surfactant sodium 1,4-bis(2-ethylhexoxy)-1,4-dioxobutane-2-sulfonate (AOT) was formed in n-hexane. First, the samples were preprocessed by reverse micelle extraction, and then rhodamine B was extracted from the mixture with methanol by back-extraction. The effects of different parameters including the concentration of surfactant, pH, amount of potassium chloride, ultrasonic time and type of organic solvents were evaluated and optimized during reverse micelle formation. The limit of detection of rhodamine B was 0.01 μg g−1. The intra-day and inter-day precisions expressed as relative standard deviations were 3.6% and 4.5%, respectively. The recovery of rhodamine B obtained was 95.0%. The reverse micelle method proposed for the determination of rhodamine B in real samples of lipsticks has the advantages of simplicity, speed, high precision, low detection limit and the use of inexpensive equipment.
研究领域:
分析化学
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食品与化妆品安全
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药物分析
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分子检测
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环境与健康
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DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
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2025
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IF 4
Xiao Dai,Xianhong Zhu,Shiyu Li,Ze Wu,Chenyang Zhao,Xun Gao,Longshan Zhao
Some illegal businesses often add antibiotics such as sulfonamides to expand the functional range of lipstick. However, the abuse of antibiotics will lead to serious adverse reactions and increase the drug resistance of bacteria. To ensure the safety of lipstick, it is necessary to monitor the antibiotic content, which urgently needs to develop an efficient and highly sensitive analytical method. In this study, a magnetic solid-phase extraction (MSPE) method was developed using a composite adsorbent based on carboxylated multi-walled carbon nanotubes (c-MMWCNT) and carbon dots (CDs) for sample pretreatment. A magnetic dispersive solid-phase extraction coupled with high-performance liquid chromatography method was established using silanized serine‑modified carbon dots (Sil-Ser-OCDs) as the sorbent for the determination of sulfapyridine (SPY) and sulfamethazine (SMT). Key extraction parameters including adsorbent dosage, extraction time, and pH were optimized using response surface methodology. The optimal extraction conditions were determined to be an adsorbent dosage of 72 mg, extraction time of 4.5 min, and pH 6.0. Under the optimal conditions, the recoveries of SPY and SMT were in the range of 88.0%-93.4%, and the RSD values of intra-day and inter-day precision were under 4.2% and 5.4%, respectively, indicating that the approach has excellent accuracy and precision.
研究领域:
分析化学
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环境科学
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药物分析
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纳米技术
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产品关联
DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2022
·
IF 4.831
Tian Shi,Zhiyuan Cheng,Tong Liu,Zhiqi Ye,Yueli Zhang
Cancer-causing dye Sudan III is banned adding to cosmetics, so a method for detecting trace Sudan III in cosmetics is established. A single dispersed up-conversion molecularly imprinted fluorescent nanoprobe is constructed and coated on the filter paper. The mechanism for detecting Sudan III by this composite fluorescent nanoprobes-paper is systematically analyzed. The fluorescent response (max emission peak is at 541 nm) is linearly related to 10–1000 nM Sudan III, and Sudan III can be selectively recognized (imprinting factor increased to 4.1). The limit of detection and quantitation are further reduced to 2.89 nM and 9.63 nM, respectively. The recoveries of Sudan III in lipstick samples are between 93.18 and 108.3%, and relative standard deviation is less than or equal to 4.6%. Trace Sudan III in cosmetics are detected accurately and sensitively by this method due to up-conversion nanoparticles with little interference of background fluorescence and molecularly imprinted polymers with selective enrichment.
研究领域:
分析化学
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纳米技术
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材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
Analytical Methods
·
2014
·Vol. 6
·期 20
·8129-8135
·
IF 1.938
Jinjiao Shi,Ligang Chen
A sensitive and simple method for high-performance liquid chromatography (HPLC) determination of Sudan dyes in lipstick samples after preconcentration by cloud point extraction (CPE) has been developed. The nonionic surfactant Triton X-114 was chosen as the extraction medium. Various experimental conditions were investigated to optimize the extraction and preconcentration process. Under optimum conditions, 3% Triton X-114 (v/v), ultrasonication for 20 min, pH 7, the satisfied recoveries of Sudan dyes were obtained. For the preconcentration of Sudan dyes by cloud point extraction, the solution was incubated in a thermostatic water bath at 60 °C for 10 min, and 22.5% sodium chloride (m/v) was added to the solution to facilitate the phase separation and increase the preconcentration factor. The limits of detection for the analytes are 0.11, 0.10, 0.07 and 0.08 μg g−1, respectively. The intra-day and inter-day precisions of four Sudan dyes are in the range of 4.6–6.4% and 4.4–6.7%, respectively. The recoveries of four Sudan dyes are 89.3%, 90.3%, 91.8% and 92.0%, respectively. The results demonstrate that this method is simple, rapid, sensitive and low cost. Moreover, it does not require the large consumption of organic solvents and is a non-toxic and eco-friendly method.
研究领域:
分析化学
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化妆品科学
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环境化学
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
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2020
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IF 4.389
Peng Zhang,Gang Wu,Chenmiao Zhao,Lin Zhou,Xiaojun Wang,Shaohua Wei
Amphiphilic block copolymer can self-assemble to stomatocyte-like structure as drug delivery carrier. Photodynamic therapy (PDT) is an emerging modality for cancer treatment. However, PDT has various problems, such as weak tumor accumulation ability of photosensitizers (PSs), short lifetime of singlet oxygen ( 1 O 2 , main reactive oxygen species in PDT) and tumor hypoxia microenvironment, to restrict its therapeutic efficacy. To convey PSs to tumor tissues and improve PDT efficacy, iron oxide nanoparticles (IONPs) were loaded inside the self-assembly stomatocytes-like structure of poly(ethylene glycol) block polystyrene (PEG- b -PS) as nanomotors (IONPs loaded stomatocytes nanomotors, denoted IS-NMs) for PS (zinc phthalocyanine, ZnPc) delivery. The hybrid nanomotors (iron oxide nanoparticles loaded [email protected] nanomotors, denoted ISP-NMs) can be gathered in tumor tissues under magnetic field owing to magnetism of IONPs. After been trapped by cancer cells, IONPs can catalyze decomposition of endogenous H 2 O 2 to generate O 2 as propelling force for ISP-NMs movement. The motion characteristics of ISP-NMs expanded the distribution of ZnPc to enlarge ROS reactive distribution and enhance the activity of PDT. And the generated O 2 can be supplied for PDT process to ensure its high-performance. Furthermore, ISP-NMs have nuclear magnetic resonance imaging (MRI) function since IONPs are efficient T 2 contrast agent.
研究领域:
纳米技术
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癌症研究
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治疗药物递送
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生物医学工程
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分子影像
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产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
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2021
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IF 5.097
Zihao Chen,Hanbing Zhang,Shuangye Yang,Jie Wei
This paper proposes a patterned material composed of two types of photonic crystals based on CdS and SiO2 nanoparticles. We combined the photonic crystals with poly(ethylene glycol) diacrylate (PEGDA) by nanoparticle self-assembly and UV curing and successfully formed a material containing the different photonic crystals. The material prepared contains two kinds of photonic crystals with different refractive indices, CdS and SiO2 nanoparticles, and due to the large difference in refractive indices of the two materials, the reflection wavelengths of the photonic crystals composed of the two materials also have disparities when the incident angle changes. Macroscopically, the structural colors of the two photonic crystals change with the change in incident angle. In response to this phenomenon, we designed a variety of applications based on a multiangle patterned photonic crystal film to achieve a variety of information storage functions by changing the incident angle and, through the angle change, to achieve lipstick logo, mobile phone bar code, and antipeeping keyboard applications.
研究领域:
材料科学
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纳米技术
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光学
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信息技术
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）