Chen X.Q.,Kunming University of Science and Technology |
Wang Q.Q.,Kunming University of Science and Technology |
Li J.M.,Institute of Product Quality Supervision and Inspection |
Wang Y.Q.,Institute of Product Quality Supervision and Inspection |
And 2 more authors.
Asian Journal of Chemistry | Year: 2013
Simultaneous distillation and extraction, static headspace assay and headspace-solid phase microextraction combined with GC/MS, were optimized to analyze flavour compounds in Tricholoma matsutake. The optimal conditions for simultaneous distillation and extraction were as following: sample/solution 6:8 (w:v), incubation 1 h, 90 C distillation 2 h, 1 min extraction. The optimal conditions for static headspace assay were 130 C equilibrium 30 min. For headspace-solid phase microextraction, the best conditions were 80 C equilibrium 5 min, PDMS fibers extraction. 52, 27 and 27 flavour compounds can be identified by the improved simultaneous distillation and extraction, static headspace assay and headspace-solid phase microextraction, respectively. The analytical results from headspace-solid phase microextraction were similar to those from simultaneous distillation and extraction, of which 14 flavour compounds were also found in simultaneous distillation and extraction. Headspace-solid phase microextraction and simultaneous distillation and extraction were partly overlapped. While only 7 compounds from static headspace assay can also be detected in headspace-solid phase microextraction and simultaneous distillation and extraction. Twenty compounds unidentified in headspace-solid phase microextraction and simultaneous distillation and extraction can be detected in static headspace assay. Therefore, we suggested that the complementation and combination of improved static headspace assay and headspace-solid phase microextraction were applied to the analysis of flavour compounds in T. matsutake due to its efficiency and simplicity.
Li S.-Q.,Chengdu University of Technology |
Zhou L.-C.,Institute of Product Quality Supervision and Inspection |
Zhou L.-C.,National Center for Packaging Material Quality Supervision and Inspection |
Zhang X.-F.,Institute of Product Quality Supervision and Inspection |
And 3 more authors.
Xiandai Huagong/Modern Chemical Industry | Year: 2015
A method for rapid determination of 3 antioxidants in food packaging bags, such as butylated hydroxyanisole (BHA), butylated hydroxytoluene (BHT) and tert-butylhydroquinone (TBHQ), is established by using gas chromatography-mass spectrometry (GC-MS). The effects of the extractants, ultrasonic extract time and temperature, and the stability of 3 antioxidants are investigated. The results show that the linear range of 3 antioxidants is 0.5-40 mg/L with the linear correlation coefficient above 0.997. The lowest limit of detection for BHA, BHT and TBHQ are 0.14, 0.03 and 1.04 mg/kg, respectively. The mean yield is 90.7%-98.8% and RSD is 1.1%-9.0%. This method is suitable for simultaneous determination of these 3 antioxidants in food packaging bags due to its fast analysis, high detection sensitivity, simple pretreatment of the samples and good reproducibility. ©, 2015, Xiandai Huagong/Modern Chemical Industry. All right reserved.
Gao Y.-n.,Shaanxi Normal University |
Tian C.-r.,Shaanxi Normal University |
Zhao L.-l.,Institute of Product Quality Supervision and Inspection
Journal of Forestry Research | Year: 2012
Ultrasonic extraction (UE) was employed for the extraction of bamboo leaf polysaccharides (BLP). The influential parameters of UE procedure including extraction time, ultrasonic power and solid/liquid ratio were optimized by orthogonal experiments. DEAE-cellulose column chromatography was applied to purify BLP and then the radical scavenging activity of BLP was also evaluated. Optimal extraction conditions were: extraction time of 15 min, ultrasonic power of 300 W, and solid/liquid ratio of 1:15. Four kinds of polysaccharides were obtained by DEAE-cellulose column chromatography; the maximum superoxide radical scavenging rate (20. 4%) of BLP was inferior to that of vitamin C (VC, the control) and the hydroxyl radical scavenging rate (50%) was equivalent to that of VC. © 2012 Northeast Forestry University and Springer-Verlag Berlin Heidelberg.
Zhao L.,Liaocheng University |
Guo H.,Liaocheng University |
Wang T.,Institute of Product Quality Supervision and Inspection
Proceedings 2011 International Conference on Transportation, Mechanical, and Electrical Engineering, TMEE 2011 | Year: 2011
Bionics is a growing field that has the potential to drive engineering advances. This research focuses on investigating the characteristics of biological structures with illustrations of successful mechanical bionic designs. After natural selection, they exhibit remarkable optimized capabilities and igneous structures from macro-meso-micro(nano) scales, which can be extracted for achieving maximal performance from minimal resources. The similarities and differences between biological and mechanical structures are summarized. The current state and application prospect is presented and discussed, indicating that the structural bionics is challenging but promising for updating traditional mechanical design concepts and achieving maximum structural efficiency. © 2011 IEEE.