FOOD CONTROL
·
2022
·
IF 6.652
Mengying Wang,Yuepeng Lu,Yong Yang,Jiahao Yu,Yechao Chen,Fengqin Tu,Jing Hou,Zong Yang,Xiaoming Jiang
Recently, we found that vanillin commonly exists in sesame oils, while vanillin compounds are not allowed to be used as food additives in edible vegetable oils according to Chinese standards for Food Additives (GB2760-2014). To trace the source of vanillin in sesame oil, an accurate and reliable method was developed and validated for the determination of vanillin, methyl vanillin and ethyl vanillin in sesame samples based on high-performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS). The limit of determination (LOD) and limit of quantification (LOQ) of the established method were in the range of 17.4–33.1 and 52.2–99.2 μg kg −1 , respectively. The calibration curves of the three vanillin compounds exhibited good linearity between 0 and 400 ng mL −1 , with a high correlation coefficient greater than 0.999. The recoveries ranged from 91.7% to 112%, with a low relative standard deviation (RSD) less than 5.55%. Then this method was applied for the detection of sesame seed and intermediate samples. The results showed that all samples contained vanillin in a concentration range of 382–3804 μg kg −1 , while methyl vanillin and ethyl vanillin were not detected in those samples. Hence, the vanillin in sesame oil may originate from its raw materials, indicating that vanillin was not a good detection marker for illegal addition of flavor enhancers in sesame oils.
研究领域:
分析化学
·
食品安全
·
食品科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2025
·
IF 4
Tiefeng Xu,Xiangjie Meng,Gangqiang Wang,Wangyang Lu
The identification of cellulose fibers from different sources remains a significant challenge across various fields due to their complex structural composition and diverse applications. In this study, pyrolysis gas chromatography/high-resolution mass spectrometry (Py-GC/HRMS) was employed to identify cellulose fibers and fabrics utilizing a relative ratio approach based on pyrolyzate yield, with levoglucosan (LG) as the primary peak, furfural (FF) and 5-methyl-2(3H)-furanone (α-AL) as reference peaks. Initially, four cellulose fibers had large discrepancies in pyrolyzate yield relative ratios when pyrolyzed at 600°C. The FF to LG ratios were 0.58-0.83 for cotton, 0.25-0.35 for flax, 0.14-0.18 for viscose, and 0.05-0.07 for tencel, while the α-AL to LG ratios were 0.64-0.88 for cotton, 0.29-0.38 for flax, 0.18-0.22 for viscose, and 0.03-0.05 for tencel. The relative proportion of fabrics has significantly decreased compared to fibers, which indicated that the manufacturing process affected the fiber components. It confirmed that alkaline bleaching can effectively eliminate fiber impurities and enhance cellulose content, which contribute to the increase of LG yield and the decrease of relative ratio. This work marks the inaugural differentiation of four cellulose fibers and fabrics using Py-GC/HRMS, offering a valuable methodology and pivotal reference data for future investigations in the field.
研究领域:
分析化学
·
高分子科学
·
材料科学
·
纺织工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2025
·
IF 6.2
Zhenzhen Xue,Jiaqi Hu,Zhixian Jing,Xiaobo Zhang,Jian Yang,Hua Li,Weihao Wang,Fajun Chen,Huasheng Peng,Bin Yang
Because producing area is one of important parameters affecting the quality of industrial products, geographic discrimination of industrial products becomes important. The use of strontium isotope ratio ( 87 Sr/ 86 Sr), a key geochemical tracer, to establish geographic discrimination model is in the ascendant. In the present work, a geographic discrimination model based on 87 Sr/ 86 Sr for Magnoliae Officinalis Cortex (MOC), a traditional Chinese medicine (TCM), was established and was applied to trace the geographic origin of MOC relic in imperial pharmacy of Qing Dynasty for the first time. The value of 87 Sr/ 86 Sr was measured using a multi-collector inductively coupled plasma mass spectrometer, by which the variabilities of 87 Sr/ 86 Sr were compared among different types of plants, different parts of the same plant, and different depths of soil to offer a reliable methodology. A reference map of 87 Sr/ 86 Sr was drawn containing 143 MOC samples data collected from 23 areas by empirical Bayesian kriging. As a result, regional difference on 87 Sr/ 86 Sr was observed from both of plant and soil samples, and no significant differences were observed for different types of plants or for different parts of the same plant in same geographic area. The 87 Sr/ 86 Sr of MOC reflected well to the bioavailable 87 Sr/ 86 Sr of soils at depths of 0–10 cm and 20–30 cm. The reference map of 87 Sr/ 86 Sr based on MOC data was successfully established with good predictive ability, from which the MOC relic was suggested to come from Hubei and Sichuan, and the result was further supported by the evidence from local chronicles in Qing Dynasty. This study extends the application of 87 Sr/ 86 Sr for provenance of TCM relics, providing direct evidence for the geographic origin of Dao-di herbs.
研究领域:
地球化学
·
考古地球化学
·
药学
·
同位素分析
·
来源鉴定
·
中医药学
·
环境科学
✓ 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）