CHINESE JOURNAL OF CHEMISTRY
·
2013
·Vol. 31
·期 10
·1329-1335
·
IF 0.917
Saisai Hong,Wenyu Kang,Yue Su,Yinlong Guo
In the traditional research of volatile compounds, some trace-level compounds could not be identified by gas chromatography-mass spectrometry. Target and post-targeted methods were applied in the investigation of trace-level volatile compounds in fresh turf crop ( Lolium perenne L.) based on gas chromatography in combination with hybrid quadrupole time-of-flight mass spectrometry. According to literatures published, a target analysis was performed by using retention index, accurate masses of characteristic ions and second-stage mass spectra (MS 2 spectra). And a series of experiments showed that low electron impact energy was beneficial to the improvement of the abundances of low abundance molecular ion peak. Enhancing the abundances of low abundance molecular ion peak was beneficial to qualitative analysis. Totally, 60 volatile compounds were identified, the great majority compounds of which were benzeneacetaldehyde (14.8%), 2,5-dimethyl-pyrazine (9.6%), and hexanal (9.3%). Identification was complied by mass spectral search, retention index and accurate masses of characteristic ions.
研究领域:
植物学
·
分析化学
✓ 已验证
DOI
高影响因子
FOOD SCIENCE AND BIOTECHNOLOGY
·
2025
·
IF 3.1
Zhang Dunhe,Peng Xiaowei,Chen Huijing,Tan Chuanbo,Wang Zhirong,Kan Jianquan
This study evaluated the effects of five extraction methods (fresh pressing, cold pressing, hot pressing, solvent extraction, and aqueous extraction) on the quality of Idesia polycarpa oil (IPO). The results revealed that the solvent–extracted oil (SEO) exhibited the highest efficiency. However, the fresh–pressed oil (FPO) exhibited outstanding quality characteristics. Specifically, the acid value and peroxide value of FPO were the lowest, and the retention rate of beneficial trace components such as α –tocopherol, squalene, β –sitosterol, stigmasterol, and carotenoids were rather prominent. It is worth noting that the five IPOs were similar in fatty acid composition and content (all rich in unsaturated fatty acids mainly composed of linoleic acid). Through analysis of volatile components and Orthogonal Partial Least Squares–Discriminant, 14 key biomarkers were identified. There were significant differences in the antioxidant capacity of five IPOs, and the aqueous–extracted oil (AEO) stands out the most, indicating that AEO is more effective at resisting radicals produced during oxidation. In conclusion, this study offers valuable data references for selecting extraction processes rationally in the oil industry. Graphical abstract
研究领域:
食品科学
·
天然产物化学
·
油脂工程
·
分析化学
·
功能食品
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Separation Science Plus
·
2024
·Vol. 7
·期 8
·e202400095
·
IF 1.3
Mengqi Shen,Qi Lian,Sicong You,Lu Zhou,Baocheng Xu,Hongwei Zhang,Muhammad Usman Amjad,Lili Liu
The purpose of this study was to investigate the effects of different chromatographic column absorbents (activated clay, silica gel, and activated aluminum oxide) on the adsorption and removal of minor components (sterols, tocopherols, β-carotene, free fatty acids (FFAs), secondary oxidation products, and peroxides) in vegetable oils. For single absorbents, activated aluminum oxide was the most effective material for removing tocopherols and FFAs from oil. All the adsorbents used have the capacity to remove β-carotene from edible oils, and activated clay has the strongest ability, with removal rates reaching 99.8%. The brassicasterol, campesterol, β-sitosterol, γ-tocopherol, and δ-tocopherol in vegetable oil can be completely removed by silica gel. Using a combination of these absorbents, a multistage optimized method was developed to maximize the removal of various minor components from vegetable oils. After multistage purification, free sterols, tocopherols, FFAs, β-carotene, and secondary oxidation products were completely removed, whereas peroxides were also removed at concentrations less than 0.71 mmol/kg. The purified oils could be used as standard samples for in-depth study of the effects of minor components on formation of association colloids and their influence on oil oxidation, as well as for evaluating the antioxidant potential of novel antioxidants or extracts.
研究领域:
食品科学
·
化学工程
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2021
·
IF 7.514
Zihan Xu,Shanshan Liu,Mingyue Shen,Jianhua Xie,Jun Yang
Trans fatty acids (TFAs), associated with the risks of coronary heart disease and diabetes, are formed by isomerization of unsaturated fatty acids during refining of linseed oils. In this study, TFAs and the chemical characteristics (acid value, peroxide value, carbonyl compounds, bioactive minor components and fatty acids) in 32 commercial linseed oils were investigated, and the correlation among them were further analyzed. Results showed that C18:3 TFAs were predominant TFAs in linseed oils and about 9% of the samples had TFA contents above 2 g/100 g fat, as well as the average level of TFA in the refined samples was higher than that in the unrefined oils. The correlation analyses suggested C18:3 TFAs exhibited significant negative correlations with acid value, levels of acetone, trans -2-nonenal, campesterol and α-linolenic acid. These results provided a comprehensive insight of TFAs in linseed oil and had important implications for consumers and linseed oil industry.
研究领域:
食品科学
·
营养学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Food Chemistry-X
·
2024
·
IF 6.5
Jingtao Cui,Siqi Zhao,Yanchi Zhou,Tian Li,Weimin Zhang
A foodomics approach was employed to systematically characterize and compare the quality parameters, antioxidant activity, minor-components, fatty acid composition, and lipid profiles of the seed oils from the three most popular rambutan varieties in China. The total lipid content ranged from 23.40 to 25.77 g/100 g. The fatty acids 9cC18:1 (39.84%–40.92%) and C20:0 (28.45%–30.23%) were identified as the dominant ones, which are uncommon among higher plants. All oil samples exhibited low AI and TI values. BR-7 exhibited the highest levels of squalene (21.48 mg/kg), cholesterol (144.43 mg/kg), and tocopherol (17.42 mg/kg), and the lowest levels of polyphenols (24.21 mg GAE/kg). Additionally, a total of 807 lipid species were identified, with TAG, DGTS, and PE being the predominant ones. Multivariate statistical analyses revealed significant variations in lipid profiles among the varieties, particularly in glycerophospholipids and sphingolipids. Fifty-seven distinct lipids were identified as potential markers for distinguishing between rambutan varieties. Furthermore, a hypothetical scenario was developed by linking relevant lipid metabolism pathways. These findings establish a theoretical framework for comprehending rambutan seed oil in depth and unlocking its high-value potential.
研究领域:
食品科学
·
营养学
·
化学分析
·
生物化学
·
植物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）