Journal of Essential Oil Bearing Plants
·
2024
·
IF 2.1
Runhu Xin,Miao Liang,Rui Wang,Yajian Wu,Wei Guan,Yuping Liu
To investigate the volatiles and odor-active compounds (OACs) in essential oils (EOs) from leaves, fresh fruits and seed shells of Platycladus orientalis (L.) Franco, three EOs were extracted and analyzed by hydrodistillation combined with gas chromatography-mass spectrometry (GC-MS), gas chromatography-mass spectrometry-olfactometry (GC-MS-O) and GC. The yields of three EOs were 0.22%, 0.48% and 1.94%, respectively; a total of 77 compounds were identified by comparing their mass spectra and retention index with those of the authentic standards or the related data reported in the references, and 29 odorants were determined as OACs. Among them, 58 volatile components were identified in the leaf EO, accounting for 98.19% of the total volatiles, of which 18 compounds were screened as OACs; 47 volatile components were determined in the fruit EO, representing 98.98% of the entire volatile oil, of which 12 compounds were sniffed as OACs; 49 volatiles were found in seed shell EO, covering 97.26% of the whole volatiles, of which 19 compounds were detected as OACs. OACs in three EOs were significantly different, and the odorants with higher concentrations included α-pinene, sabinene, δ-3-carene, myrcene, β-caryophyllene, α-terpinyl acetate, cedrol, etc., which could be used as indexes for optimizing extraction process parameters of POF EOs and evaluating EO quality. The in vitro antioxidant activity of three EOs was tested by DPPH assay, ABTS assay and FRAP assay.
研究领域:
植物化学
·
分析化学
·
食品科学
·
药理学
✓ 已验证
DOI
高影响因子
JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2024
·
IF 4
Han Xia,Hongyan Zhang,Zhehui Zhu,Kai xuan Tong,Qiaoying Chang,Hongyi Zhang,Chunlin Fan,Hui Chen
A method for the determination of eight biogenic amines (BAs) in air-dried yak meat was established using ultra-performance liquid chromatography–mass spectrometry (UPLC–MS/MS) without derivatization. The conditions of UPLC–MS/MS, pH, hydration volume, extraction solvent, extraction salt, and clean-up sorbent were optimized according to the characteristics of the BAs and the sample matrix. The samples were extracted with acetonitrile, the extract was purified using primary secondary amine (PSA) and C 18 . The BAs were determined using multiple reaction monitoring (MRM) within 5 min. The eight BAs exhibited good linearity, and the determination coefficient ( R 2 ) was greater than 0.997. The limits of detection (LODs) and the limits of quantification (LOQs) ranged from 0.40 to 2.50 μg/kg and from 1.25 to 7.50 μg/kg, respectively. The accuracy was between 80.3 % and 109.6 %, with relative standard deviations (RSDs) between 0.4–7.1 %. The method was applied in the detection of representative commercial samples of different processing techniques. In this method, the sample was pretreated free of derivatization and was simple, rapid, with minimum personal error, and high sensitivity. The method was assessed via GAPI and BAGI, verifying its environmental friendliness and applicability. It provides reliable methodological support for the determination of BAs in meat products.
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
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2023
·
IF 6.1
Yu Zhang,Si Wu,Qian-Qi Chen,Peng-Fei Yu,Hai-Ming Zhao,Nai-Xian Feng,Bai-Lin Liu,Yan-Wen Li,Quan-Ying Cai,Lei Xiang,Ce-Hui Mo,Qing X. Li
Fluorotelomer alcohols (FTOHs), as precursors of perfluoroalkyl carboxylic acids, are difficult to analyze due to their high volatility and matrix interference. A method based on single-factor experiments and response surface methodology design was developed for simultaneous analysis of three common FTOHs in vegetables and soils, using single extraction, dispersive solid phase extraction cleanup, and gas chromatography–mass spectrometry in negative chemical ionization. The method improved the extraction efficiency up to ∼40 folds and showed a commendable linearity range (1–100 ng/mL, R2 > 0.991), low limit of detection (0.025−0.897 ng/g, dry weight (dw)), and high accuracy and precision (83 ± 7.2–117 ± 6.0% recoveries at 2–20 ng/g fortification levels). It was successfully applied to determine the FTOHs in real vegetables and soils, demonstrating its feasibility for routine analysis. Concentrations of the FTOHs ranged from 3.5 to 37.9 ng/g (dw) and from 6.5 to 141.0 ng/g (dw), respectively, in the vegetables and soils collected nearby fluorochemical factories, which warrants further investigations on FTOH pollution and food safety concerns for which the developed method will be useful.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2012
·
IF 4.531
Kaoqi Lian,Pingping Zhang,Lingmei Niu,Siyuan Bi,Shipeng Liu,Lingling Jiang,Weijun Kang
A new method was developed for determination of ketamine (KT) in urine and plasma samples by derivatization and gas chromatography–mass spectrometry. In this article, KT was first derivatized with sodium nitrite to volatile N-nitrosamines under acidic condition. Then the derivative had been identified by the mass spectra. The derivatization conditions including the amount of hydrochloric acid, the amount of sodium nitrite, reaction temperature, reaction time and the extraction reagents were optimized. Calibration curves were linear in the range of 0.04–20 μg mL −1 for KT, and the limit of detection (LOD) and limit of quantitation (LOQ) were 0.01 μg mL −1 and 0.04 μg mL −1 , respectively. The results of recovery indicated that the method had good precision and reproducibility. Compared with existing derivatization methods, this method provided a rapid, convenient, effective and low-cost way for gas chromatography method of KT quantification.
研究领域:
分析化学
·
医学检验
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2024
·
IF 4
Mengqi Xu,Jun Li,Yanlan Bi,Jie Song,Chenyu Fu
A GC-MS method was investigated for simultaneous determination of TBHQ and its transformation products (TBBQ, MAHQ) in fats and oils. Three substances were determined with good linearity of 0.15–100.00 μg/mL (R 2 > 0.9982); low LODs (0.05, 0.17, and 0.10 μg/mL) and the LOQs (0.15, 0.52, and 0.30 μg/mL). The recoveries of the three substances ranged from 93.28 % to 104.64 %. The method is sensitive and reproducible and meets the requirements of the methodology. The initial addition of TBHQ can be assessed with a recovery of > 90 % based on three substances, and the recovery could be closer to the initial addition of TBHQ if more transformation productions of TBHQ were identified with further in-depth study in the future. Compared to reported HPLC methods, the method realizes accurate quantitative detection of TBHQ and its transformation products, which can address the discrepancies between upstream and downstream enterprises in the food industry regarding the amount of TBHQ addition. This method allows downstream companies to precisely control the addition level in order to meet the requirements (maximum of 200 mg/kg based on oil content) regulated by National Standards as well as provide theoretical support for the scientific understanding and application of TBHQ in food industry.
研究领域:
分析化学
·
食品科学
✓ 已验证
产品关联
DOI
高影响因子
PROPELLANTS EXPLOSIVES PYROTECHNICS
·
2022
·Vol. 47
·期 4
·e202100230
·
IF 2.134
Pengfei Su,Xiu-tian-feng E,Jingna Wang,Yanlong Zhu,Gao Zhang,Hai Chang,Ke Liu,Zihui Meng
The detection and separation of impurities are crucial for the quality control of triethylboron. While the purity of triethylboron is the key factor for ballistic performance, impact accuracy, and storage safety. This work will explore a modified gas chromatography-mass spectrometer method to detect and separate the impurities in synthesized triethylboron. They are identified as CH 3 CH 2 OCH 2 CH 3 , (CH 3 CH 2 ) 3 B, (CH 3 CH 2 O) 3 B, CH 3 CH 2 CH 2 CH 2 B(CH 3 CH 2 ) 2 and (CH 3 CH 2 ) 3 O 3 B 3 . Further, optimized GC conditions are demonstrated to quantify the synthesized triethylboron accurately and determine its purity. The purity of triethylboron is 96.39 % via a normalization method with high accuracy (RSD=0.05 %). The optimized GC conditions were as follows: a hydrogen flame ionization detector, nitrogen as carrier gas whose pathway was installed with a water trap and an oxygen trap, an HP-5 capillary column (30 m×0.32 mm×0.25 μm) with the column temperature of 60 °C, an inlet temperature of 120 °C, the detector temperature of 150 °C, and an injection volume of 0.6 μL. This work demonstrates a simple and precise method to analyze the synthesized triethylboron and its impurities.
研究领域:
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
iScience
·
2025
·
IF 4.1
Sanli Tang,Chengliang Mao,Guanshu Zhao,Jessica Ye,Wenqiang Qu,Lei Wu,Geoffrey Ozin
Attaining reliable performance indicators via 15 N-labelling is a daunting research endeavor for sustainable ammonia and urea synthesis processes, as currently obtained reaction rates and yields are often low. However, artefact and misinterpretation can be induced by ppm-level impurities in commercial 15 N 2 and 15 NH 3 cylinders, which are not well understood. Here, we report quantitative in-line gas chromatography mass spectrometry (GC-MS) analysis of impurities in commercial 15 N 2 and 15 NH 3 cylinders at ppm level, in conjunction with 1 H-NMR methods, exemplified by 808—16252 ppm of 14 N 15 N, 2472—4891 ppm 15 NH 3 , 3—319 ppm 14 NH 3 , 0—231 ppm of 14 NO 2 , 0—176 ppm 15 NO 2 , and 0—566 ppm 15 N 16 O impurities, some of which were not reported in cylinder certification nor previous studies. The collected results have formed recommended protocols applicable to all future 15 N labelling experiments intended to eliminate false positives.
研究领域:
化学工程
·
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SN Applied Sciences
·
2021
·Vol. 3
·期 3
·1-9
·
IF 0
Ma Yinzheng,Wen Yingying,Chen Jinping,Zhang Yunxia,Zhang Haiying,Sui Jinlei,Yi Guohui,He Xiaowen
A rapid and sensitive headspace gas chromatography-mass spectrometry (HS-GC–MS) method was established for the determination of benzyl isothiocyanate (BITC) in the peel, pulp, and seeds of Carica papaya Linn. Tween 80 solution with a concentration of 0.002% ( w/v ) was chosen as a headspace medium for solving the poor solubility of BITC in water without using organic solvents and ensuring high headspace efficiencies. Extraction parameters had been evaluated and optimized by using an orthogonal design with an OA 9 (3 4 ) table. Optimal headspace conditions were obtained when vials were equilibrated at 80 °C for 20 min at a stirring speed of 375 rpm. The calibration curve obtained by using GC–MS was linear in a concentration range of 10–320 ng/mL. The recoveries of peel, pulp, and seeds ranged from 97.3 to 100.6% with RSDs less than 3.0%. The method is simple, rapid, sensitive, and environmentally friendly. It is suitable for analyzing BITC in papaya fruit and is expected to have important application potential in the extraction of water-insoluble volatile components in foods, plants, medicines, and other samples.
研究领域:
食品科学
·
分析化学
·
植物学
✓ 已验证
产品关联
DOI
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2013
·Vol. 29
·期 4
·653-656
·
IF 0.735
Wang Wen-wen,Gao Fu-kai,Li Gui-zhi,Liu Zhen-bo,Liu Yong-ming
A simple, environmentally friendly and high efficient extraction method was proposed for the determination of five phthalates in aquatic products by gas chromatography combined with mass spectrometry detector (GC-MS). When this method was adopted, samples were pretreated by modified QuEChERS(quick, easy, cheap, effective, rugged and safe) method. An environmentally friendly extractant(ethanol aqueous solution) replaced toxic acetonitrile for extracting phthalates in the protein-matrix samples. Fluorescence quenching spectra of bovine serum albumin(BSA) with phthalates show that there was a high-affinity interaction between phthalate and protein, decreasing the extraction efficiency of phthalates from fish samples. However, in the 80%(volume fraction, φ ) ethanol aqueous solution, a slow but full protein denaturation takes place, which would cause the unfolding of protein and the release of phthalates. Meanwhile, the fat-soluble impurities are extracted less in φ (ethanol) 80% aqueous solution than in either φ (ethanol) 100% or hydrophobic solvents in the liquid-liquid extraction procedure. Therefore the purification steps were greatly simplified. Overall recoveries were 81.77%–90.5% with limits of detection between 2.53 and 9.61 μg/L, and relative standard deviation values at 1.15%–4.85%. The proposed approach was satisfactorily applied to the determination of phthalates in real aquatic products, such as fish, shrimp and oyster.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHARMACEUTICAL AND BIOMEDICAL ANALYSIS
·
2025
·
IF 3.1
Pei Zhang,Wei Xia,Yang Bai,Fuyuan Zhang,Yan Zhang,Wei Jiang,Huiya Yuan
The estimation of postmortem submersion interval (PMSI) has always been an important scientific issue to be addressed in drowning cases. Traditional methods, such as corpse temperature analysis and the assessment of corpse surface corruption, have limitations and cannot meet the need for accurate estimation of the time of death in the mid to late stages. Biogenic amines, as small molecules produced by protein degradation after death, have a certain regularity in relation to PMSI. To further explore the possibility of utilizing polyamines to estimate PMSI, this experiment constructed a rat cadaver model in both laboratory constant-temperature water and natural water bodies. Furthermore, cadaverine and putrescine in the liver and skeletal muscle were detected at different PMSI using gas chromatography-mass spectrometry (GC-MS). Through statistical analysis, we have constructed eight sets of mathematical models for polyamines-PMSI estimation, and determined the applicable time range through derivative analysis. After evaluation the models, the error rate in inferring PMSI using the fitted equations was less than 30 % within 242 h. The models established in this study could accurately infer PMSI in the mid to late stages of the postmortem period, providing a feasible approach for the drowning forensic issue.
研究领域:
法医学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
·
2020
·
IF 4.006
Dandan Qi,Chengying Ma,Wenwen Wang,Licui Zhang,Jinghong Hao,Jianke Li
The aim of this study is to reveal differences of volatile components of royal jelly (RJ) produced by different honeybee stocks. Volatile components of three RJ samples from high and low RJ production honeybee stocks were extracted by headspace-solid phase micro-extraction and analyzed by gas chromatography-mass spectrometry. Principal component analysis, hierarchical clustering analysis of the volatile components are suggestive of the fact that honeybee stock selected for increasing RJ yields (royal jelly bees) has shaped distinct volatile component profile compared with the unselected Italian bees. In total, 37 components were identified that could distinguish three RJ samples, including 5 aldehydes, 5 esters, 5 alkanes, 14 alcohols and phenols, 4 ketones and 4 other components. Our study provides the first characterization of volatile components in RJs and uncovered the differences among royal jelly secreted by different bee stocks.
研究领域:
昆虫学
·
化学分析
✓ 已验证
产品关联
DOI
高影响因子
Journal of Radiation Research and Applied Sciences
·
2022
·
IF 1.773
Lifen Meng,Zhi Xia,Jingsong Lv,Gaofu Liu,Ye Tan,Qianzhu Li
In this paper, five phenolic acids in the rhizosphere soil of Pinellia ternate were determined to have strong allelopathy to Pinellia ternate . The phenolic acids in rhizosphere soil and non continuous cropping soil of Pinellia ternate for two years were extracted and detected by GC-MS, 5 phenolic acids were found to have different content changes. By comparing the contents of phenolic acids in the rhizosphere soil before, during and after planting, and combining with the literatures, it was determined that protocatechuic acid, vanillic acid, vanillin, syringate and syringaldehyde had strong allelopathy on the growth and development of Pinellia ternate . Furthermore, the effects of the above five phenolic acids on the growth of Pinellia ternate , the growth of seedlings and the comparison of tuber size were investigated. The results showed that the five phenolic acids had inhibitory effects on the growth of Pinellia ternate .
研究领域:
植物学
·
生态学
·
农学
✓ 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）