JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2023
·
IF 4.3
Shouyin Wang,Shengjie Li,Wenhui Wang,Xiuxia Guo,Jinfeng Pan,Xiuping Dong
This paper aimed to develop a quantitative method based on high-performance liquid chromatography (HPLC) coupled with triple quadrupole tandem mass spectrometry (MS/MS) for the simultaneous determination of two protein carbonylation products derived from lysine residues in meat proteins, namely, α-aminoadipic semialdehyde (AAS) and lysinonorleucine (LNL). Mass spectrometry conditions and derivatization parameters were optimized and the linearity, repeatability, bias, the limit of detection (LOD), the lower limit of quantification (LLOQ), and recovery were validated. The developed method showed satisfactory linearity, repeatability, and sensitivity for both AAS and LNL. This method was applied to analyze the contents of these compounds in different meat products, and the formation of AAS was observed to be closely related to the severity of the manufacturing conditions. Moreover, AAS was demonstrated to be a reliable but more sensitive marker for protein carbonylation compared to the DNPH method, which could also provide information regarding the specific pathway of protein carbonylation.
研究领域:
食品科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
Analytical Methods
·
2019
·Vol. 11
·期 10
·1361-1370
·
IF 2.378
Qing Luo,Xu Gao,Yuanan Hu,Kunde Lin,Xuejun Wang,Hefa Cheng
This work developed a method for rapid determination of methylmercury (MeHg) in rice, a staple cereal widely consumed in Asia, based on microwave-assisted extraction coupled with thermal decomposition amalgamation atomic absorption spectrometry (MAE-TDA-AAS). Orthogonal design was applied to optimize the parameters of MAE, and the optimal conditions were found to be as follows: 1.5 g of rice powder extracted using 12 mL toluene and 6 mL 30% HCl solution at 110 °C for 5 min under microwave irradiation. MeHg extracted into the organic phase (4.0 mL) was then back-extracted into 2.0 mL 1.5% L-cysteine solution, followed by quantitation by TDA-AAS on a direct mercury analyzer. The MeHg recovery rate of this method determined from a spiked rice sample was 80.8% (77.5–84.1%, 95% confidence limits), while those for MeHg in certified reference materials, TORT-2 and SRM-2976, were 97.6% (91.0–104.1%, 95% confidence limits) and 93.8% (90.4–97.2%, 95% confidence limits), respectively. The limit of detection and limit of quantification for MeHg in rice were 0.13 and 0.43 ng g−1, respectively, and the relative standard deviation was below 5%. The extracts of 15 rice samples collected from two provinces in China were analyzed by both TDA-AAS and the well-developed high performance liquid chromatography coupled with inductively coupled plasma-mass spectrometry (HPLC-ICP-MS) method, and comparable results were obtained. Overall, these findings demonstrate that the MAE-TDA-AAS method developed in this study is a convenient and reliable method for quick determination of MeHg in rice and probably other food grains, and it is an order of magnitude more sensitive than the previous methods established for analysis of mercury species in fish and seafood.
研究领域:
食品科学
·
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 50
·32526-32533
·
IF 4.036
Xingyu Ding,Xin Teng,Zhuxin She,Yi Li,Yuanyuan Liu,Ying Zhuang,Chaochao Wang
The content of heavy metals is an important index to measure the quality and safety of salt. However, due to the high content of Na(I) in salt causing a large background interference, it is difficult to accurately analyze trace Pb(II) through the existing atomic absorption spectrometry. Therefore, it is of great significance to design a new solid-phase extraction (SPE) material for the removal and determination of Pb(II) from salt. Herein, using polystyrene microspheres as carriers, the chitosan-coated polystyrene SPE fillers PS@SO3H@G-CTS were synthesized by sulfonating with sulfonyl chloride, coating with chitosan and crosslinking with glutaraldehyde successively. The structure was characterized by elemental analysis, FT-IR, SEM, XRD and thermal stability. The SPE column prepared by PS@SO3H@G-CTS was used for the adsorption of heavy metal Pb(II) in salt, with 0.1 mol L−1 of HCl as Na(I) eluent and 2 mmol L−1 of EDTA-2Na as Pb(II) eluent. The salt concentration below 0.03 g mL−1 could better reflect the performance of column, with the recovery rate of 101.17–106.45% by standard addition. The PS@SO3H@G-CTS fillers could remove Na(I) under certain salt concentration, so as to accurately determine Pb(II) in the actual sample. Their adsorbability was undisturbed by common anions and low concentration of cations.
研究领域:
分析化学
·
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2017
·Vol. 184
·期 9
·3497-3504
·
IF 4.58
Zhou Shaoyan,Song Naizhong,Lv Xueju,Jia Qiong
The authors describe a hybrid of magnetic task-specific poly(ionic liquid) containing dual task-specific sites in an approach to both preconcentrate and quantify gold(III), palladium(II) and platinum(IV). The hybrid was obtained by successive alkaline coprecipitation, sol-gel, quaternization, elimination, anion exchange and polymerization. The material was characterized by scanning electron microscopy, transmission electron microscopy, FTIR spectroscopy, thermal gravimetric analysis, X-ray photoelectron spectrometry, X-ray diffractometry, and vibrating sample magnetometry. It was applied as an effective sorbent for magnetic solid-phase extraction of gold(III), palladium(II) and platinum(IV) ions. The effects of sample pH, amount of adsorbent, extraction time, eluent concentration and volume were optimized. Following elution with a thiourea/HCl solution, the ions were quantified by graphite furnace AAS. The calibration plot is linear in the 50 to 350 ng·L −1 gold(III) concentration range, in the 50 to 650 ng·L −1 palladium(II) concentration range, and in the 150 to 2100 ng L −1 platinum(IV), respectively. Other figures of merit for noble metals determination, respective, include (a) detection limits of at 19.7, 22.3 and 107.0 ng·L −1 , (b) enrichment factors of 197, 174 and 168; and (c) reproducibilities (expressed as relative standard deviations) of 2.1%, 1.4% and 1.5%. In our perception, the method excels by its high sensitivity and preconcentration capability. It was successfully applied to the determination of gold(III), palladium(II) and platinum(IV) in certified reference materials and (spiked) real samples.
An adsorbent assembling dual task-specific poly(ionic liquid) onto magnetic nanoparticles was used to preconcentrate noble metals. After experimental optimizations, the resulting magnetic hybrid material was applied to measure the concentration of noble metals in real samples.
研究领域:
分析化学
·
材料科学
·
环境科学
·
纳米技术
·
冶金化学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Jiahui Li,Boxuan Peng,Siyuan Yu,Fangzheng Zhao,Qiqi Han,Shuaibing Huang,Fengmin Jin,Jinfeng Xing
With the rapid development of industry, water pollution has become one of the important problems that harm the ecological environment and human health. The extensive use and random discharge of dyes have caused serious damage to water resources. Hydrogel bead is a promising material for dye adsorption due to its advantages of rich functional groups and high specific surface area. Here, acrylic acid sodium salt (AAS) and 2-acrylamide-2-methylpropanesulfonic acid (AMPS) as monomers, N,N’-Methylene-bis-acrylamide (MBA) as crosslinking agent, sodium alginate (SA) as semi-interpenetrating network component, laponite as nano-clay additive, and single 2′,4′,5′,7′ −tetrabromofluorescein disodium salt (EY)/ Triethanolamine (TEOA)/ diphenyl iodonium hexafluorophosphate (DPI) as green light polymerization initiating system were combined to prepare composite hydrogel beads within 10 s under green LED irradiation. The composite hydrogels were characterized by infrared spectroscopy (FTIR), thermogravimetric analyzer (TG), scanning electron microscopy (SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The addition of sodium alginate and laponite can improve the mechanical properties of hydrogel beads. In the adsorption study of malachite green, the influence of time, temperature, dye concentration, pH, ionic strength, and other factors on the adsorption effect were investigated. The adsorption process was consistent with the second-order kinetic process and Langmuir adsorption. At room temperature, the highest adsorption capacity of the hydrogel beads for malachite green reached 829.63 mg/g. The PAAS-SL hydrogel beads maintained a high adsorption effect in the pH range (3–10), and the capacity reached 575.0 mg /g at pH 3, which had a good ability to resist low pH. In the adsorption–desorption experiments, the removal rate of PAAS-SL hydrogel beads for MG is still more than 80 % after 5 cycles. Our research provides a promising strategy for the efficient and rapid preparation of hydrogel beads with excellent properties.
研究领域:
环境科学
·
材料科学
·
水处理
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
INORGANICA CHIMICA ACTA
·
2014
·
IF 2.041
Yunlan Li,Pu Guo,Niu Lin,Qingshan Li
Di-phenyl-di-(2,4-dichlorbenzohydroxamato) tin (IV) (DPDCT), a new diorganotin (IV) arylhydroxamate, has been reported to show high in vivo and in vitro antitumor activity with relatively low toxicity, but no data are available regarding its pharmacokinetics. In this paper, a selective high-performance liquid chromatography (HPLC) method was developed and validated for the determination of DPDCT in plasma. The separation was achieved by HPLC on a Diamonsil C18 column with a mobile phase composed of methanol/0.5% phosphoric acid (28:72, v/v, pH 3.0) and the detector set at 228 nm. Good linearity was found between 0.1 and 15.0 μg/ml ( r = 0.9992). A non-compartmental method was used to determine all plasma profiles. The pharmacokinetic parameters of DPDCT were also compared to data obtained for total tin by using nonselective atomic absorption spectrometry (AAS). The use of selective analytical techniques is strongly recommended for obtaining the kinetic parameters of the intact compound after single intravenous administration to rats instead of that of the complex mixture of tin containing endogenous compounds. The differences in the area under the curve (AUC), half-life ( t 1 / 2 ), and mean residence time (MRT) values for intact DPDCT and total tin showed notable statistical significance, indicating that intact DPDCT was transformed into (tin)-containing metabolites.
研究领域:
药理学
·
肿瘤学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2024
·Vol. 14
·期 6
·505
·
IF 4.4
Qi Zhang,Jian Zhang,Jian Shi,Ruilu Yang
Three Fe3O4magnetic solvent-free nanofluids with different amine-based coronal layer structures are synthesized and characterized by using magnetic Fe3O4as the core, silane coupling agent as the corona, and polyether amines with different graft densities and chain lengths as the canopy. The concentration of heavy metal ions after adsorption is measured by atomic absorption spectrometry (AAS) to study the effect of Fe3O4magnetic solvent-free nanofluids on the adsorption performance of the heavy metal ions lead (Pb(II)) and copper (Cu(II)) in water. The adsorption of Fe3O4magnetic solvent-free nanofluid was explored by changing external condition factors such as adsorption contact time and pH. Additionally, the adsorption model is established. The magnetic solvent-free nanofluid is separated from water by applying an external magnetic field to the system, and desorption and cyclic adsorption tests are carried out. Based on the adsorption mechanism, the structure design of Fe3O4magnetic solvent-free nanofluid was optimized to achieve optimal adsorption performance.
研究领域:
材料科学
·
环境科学
·
纳米技术
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER BULLETIN
·
2016
·Vol. 74
·期 4
·1061-1076
·
IF 1.371
Yong Qiwen,Nian Fuwei,Liao Bing,Guo Ying,Huang Liping,Wang Lu,Pang Hao
Self-matt coating of waterborne polyurethane (WBPU) was synthesized by combining prepolymer and self-emulsification methods. The emulsion was fabricated from both hydroxy carboxylic acid and aminosulfonic acid types of hydrophilic chain-extending agents, in which the 2-[(2-aminoethyl) amino] ethane sulphonate sodium (AAS salt) was produced in laboratory. This emulsion demonstrated an excellent matt performance without the addition of extra matting agents after filming. Four different kinds of surface properties were measured on the film: the specular gloss (60° gloss meter), the contact angle (CA), the surface roughness degree (3D Surface Profilometer), and the topography of the coatings surface (SEM). The results showed that tons of spherical particles with diameter in a few micrometers were aggregated on the film surface. The effect of the roughness parameters ( R
a
and R
q
) and the average particle size of the emulsions on the specular gloss degree were probed. The research indicated that the emulsion with average particle size in the range of 2.5–3.0 µm and, meanwhile, the film with roughness parameters R
a
and R
q
both greater than 1 µm could attain the best matt effect. The WBPU emulsions showed good physical and mechanical properties, and were introduced into wood varnish for matting purpose.
研究领域:
材料科学
·
化学工程
·
表面化学
·
高分子科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yao Xiao,Hai-Qin Lu,Chang-Rong Shi,Fu-Hou Lei,Darryn Rackemann,Kai Li,Wen Li,William O.S. Doherty
The decolorization of remelt syrup is the most critical step in the sugar refining process as it directly affects the quality of refined sugar. Adsorption is a useful method that can be applied to decolorize the syrup. A quaternary ammonium-functionalized chitosan/graphene oxide composite aerogel (GO-QACSA) was developed as an effective adsorbent for the removal of high-molecular-weight reducing sugar alkaline degradation products (HRSADPs), the main class of colorants in remelt syrup. The advantages of GO-QACSA to remove HRSADPs can be attributed to its well-connected 3-D network-like porous structure, nontoxicity, high hydrophilicity, and the richness of quaternary ammonium groups. The equilibrium adsorption capacity of GO-QACSA for HRSADPs reached 364.09 mg/g and the removal rate was > 90%. GO-QACSA exhibited an ultra-fast adsorption rate. Recycling experiments indicated that GO-QACSA exhibited good renewability and reusability. The interaction mechanism for the adsorption of HRSADP on GO-QACSA was studied, and the results revealed that two layers of HRSADPs adhered to the surface of GO-QACSA via electrovalent bonds formed between the quaternary ammonium and carboxylate groups. On average, 2–3 carboxylate ions in one HRSADP molecule bonded with the quaternary ammonium cations of GO-QACSA. Four phenomenological mathematical models, namely, External mass transfer resistance (EMTR), Internal mass transfer resistance (IMTR), combined EMTR–IMTR, and Adsorption on active sites (AAS), were presented based on the best-fit equilibrium isotherms. These models could be used to provide new insights into the adsorption mass transfer behaviors of the system.
研究领域:
材料科学
·
化学工程
·
环境科学
·
食品科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）