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Jia L.,Anhui University of Science and Technology | Yang J.,Anhui University of Science and Technology | Zhang L.,Anhui University of Science and Technology | Zhang F.,Anhui University of Science and Technology | And 3 more authors.
Journal of Analytical and Applied Pyrolysis | Year: 2013

Rhubarb has been used as a tobacco additive recently. In order to understand the smoke emissions of herbal cigarettes with rhubarb additive, the pyrolysis of major components of rhubarb: chrysophanol and its derivatives (emodin, rhein and aloe-emodin) have been studied by synchrotron VUV photoionization mass spectrometry (SVUV-PIMS) combined with molecular-beam sampling technique. Various pyrolysis products are observed due to the different substituent groups. The main pyrolysis products of chrysophanol come from the CO and H2O elimination reactions. The CO, CO2 and HCOOH elimination reactions are the primary pyrolysis processes for rhein. Besides, elimination of H2 from aloe-emodin and loss of OH radical from both emodin and rhein also occur in the pyrolysis process. Furthermore, theoretical calculations are used to deduce the decomposition pathways and determine the geometries of pyrolysis products. Our work shows that the combination of SVUV-PIMS measurements and theoretical calculations is powerful to study pyrolysis behavior of complex organic compounds. © 2013 Elsevier B.V.


Chen L.,Zhengzhou Tobacco Research Institution of CNTC | Han L.,Zhengzhou Tobacco Research Institution of CNTC | Li X.,Zhengzhou Tobacco Research Institution of CNTC | Xu B.,China Tobacco Jiangxi Industrial Co. | And 2 more authors.
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2016

Hot air drying is commonly used to dehydrate fruit and vegetable slices in the agricultural product processing industries. So it is important to establish a kinetic model of the drying process that can accurately describe heat and mass transfer for optimizing processes, improving drying quality and saving drying energy. However, fruits and vegetables as porous media, always have a significant volume shrinkage during drying, and many previous studies of porous media ignored the characteristics of macro-volume shrinkage with drying or more directly simplified the porous media as the materials just with a rigid skeleton, which was contributed to the situation in which there was no further analysis about the effects of the shrinkage on drying processing. Furthermore, eggplant, one of the main vegetable varieties in China, due to its short shelf life, was often sliced and dehydrated to preserve its equality instead of being eaten freshly, and the texture of eggplant is soft and porous, so its dry tissue is easy to shrink and deform during the whole hot air drying. Hence, in this paper, eggplant was chosen as the experimental porous material, and the testing methods, such as the density analysis, scanning electron microscope (SEM) analysis and mercury intrusion testing, were used to analyze the variation of sliced eggplant pore volume, structure and volume shrinkage during hot air drying. At the same time, a moisture diffusion kinetic model based on the shrinkage characteristics of the slices was established to study the effect of shrinkage on drying kinetics of sliced eggplant. As a result, internal pore volumes of the eggplant approximately linearly decreased with its moisture rate decreasing, but they were not obviously changed with hot air temperatures. During the drying processing, the proportion of the pores of smaller than 105 nm gradually increased, however, the pores of bigger than 105 nm that were dominant in the early stage of the drying gradually disappeared due to porous shrinkage caused by moisture loss when drying. In addition, according to the results of mercury intrusion testing, the peak of pore size decreased from 1.5×105 to 4×104 nm. In consideration of shrinkage properties of porous media, this work explored the influence of drying temperature on internal structure of sliced eggplant and modified the drying kinetic models based on the Fick's second diffusion law. Among those volume shrinkage models, Hatamipour model and Quadratic model could describe the real volume shrinkage better. After modifying the drying model based on Fick's second law with Quadratic shrinkage model that was selected as the best empirical shrinkage model due to its simplicity and accuracy, the convective drying kinetic model of eggplant slices could fit the experimental results more accurately. Moreover, apparent activation energy (AAE) of the sliced eggplant increased from 20.69 to 25.76 kJ/mol, indicating that the shrinkage of eggplant increased the mass transfer resistance during the process, which proved that the effective diffusion coefficient of water was overestimated obviously when not considering the influence of shrinkage on dynamics during the drying. In short, the modified kinetics models can provide a more objective evaluation of the drying characteristics of the deformable porous material and the reference for the optimization of its drying process. © 2016, Editorial Department of the Transactions of the Chinese Society of Agricultural Engineering. All right reserved.


Bao J.,China Tobacco Jiangxi Industrial Co.
Tobacco Science and Technology | Year: 2013

The detecting system of cartoner (CT) in GD packing line fails to exactly identify the cartons with appearance defects, therefore, a carton detector was designed with photoelectric and laser detection technology. The conveying and folding of carton blanks were monitored by optical fiber sensor and digital laser sensor separately, the carton with defective appearance resulted from carton blank misalignment was online rejected. And PLC was adopted for the functions of defective carton rejecting, machine stopping and alarm information displaying. The results of application showed that the detection rate for faults in carton blank conveying and folding reached 100% and 99.6%, respectively; the detection precision for carton appearance defects increased from 350 to 3 mm, and the packing quality was effectively improved.


Yang J.-Z.,Hefei University of Technology | Zhang F.,Hefei University of Technology | Jia L.-Y.,Hefei University of Technology | Zhang L.-D.,Hefei University of Technology | And 3 more authors.
Chinese Journal of Chemical Physics | Year: 2012

The pyrolysis of isopsoralen was studied by synchrotron vacuum ultraviolet photoionization mass spectrometry at low pressure. The pyrolysis products were detected at different photon energies, the ratios of products to precursor were measured at various pyrolysis temperatures. The experimental results demonstrate that the main pyrolysis products are primary CO and sequential CO elimination products (C 10H 6O 2 and C 9H 6O). The decomposition channels of isopsoralen were also studied by the density functional theory, then rate constants for competing pathways were calculated by the transition state theory. The dominant decomposition channels of isopsoralen and the molecular structures for corresponding products were identified by combined experimental and theoretical studies. © 2012 Chinese Physical Society.


Ding Y.,Hefei University of Technology | Cai J.-B.,China Tobacco Jiangxi Industrial Co. | Qi F.,Hefei University of Technology | Su Q.-D.,Hefei University of Technology
Journal of the Chinese Chemical Society | Year: 2011

The thermal decomposition behavior and the pyrolysis products of benzyl-2,3,4,6-tetra-O-acetyl-β-D-glucopyranoside (BGLU) were studied with synchrotron vacuum ultraviolet (VUV) photoionization mass spectrometry at temperatures of 300, 500 and 700 °C at 0.062 Pa. Several pyrolysis products and intermediates were identified by the measurement of photoionization mass spectra at different photon energies. The results indicated that the primary decomposition reaction was the cleavage of O-glycosidic bond of the glycoside at low temperature, proven by the discoveries of benzyloxy radical (m/z = 107) and glycon radical (m/z = 331) in mass spectra. As pyrolysis temperature increased from 300 to 700 °C, two possible pyrolytic modes were observed. This work reported an application of synchrotron VUV photoionization mass spectrometry in the study of the thermal decomposition of glycoside flavor precursor, which was expected to help understand the thermal decomposition mechanism of this type of compound. The possibility of this glycoside to be used as a flavor precursor in high temperature process was evaluated.


Zheng L.,Jiangxi University of Finance and Economics | Zheng L.,China tobacco Jiangxi industrial Co. | Le Z.,Jiangxi University of Finance and Economics
Proceedings - 2010 3rd IEEE International Conference on Computer Science and Information Technology, ICCSIT 2010 | Year: 2010

Adaptive allocation brings adaptive approaches in pursuit of sustainable social resource use and social-ecological information resilience. However, a lack of evidence from consistent evaluation of adaptive allocation exacerbates the doubt of this allocation. This paper revisits the issue of evaluation in information resource allocation and recasts it in light of complex adaptive systems thinking. An evaluative framework for adaptive allocation is developed which directs attention toward four broad components: society ecosystem conditions, information ecosystem conditions, ecological sustainability and process. Scale-specific parameters are offered for each component to facilitate systematic learning from experience and encourage comparisons. Conclusions highlight the importance of systematically incorporating evaluation into the adaptive allocation process and recognize the challenge for information resource agencies and researchers to shift from a conventional to a complex adaptive system perspective. © 2010 IEEE.


Cai J.-B.,China Tobacco Jiangxi Industrial Co. | Luo H.-T.,China Tobacco Jiangxi Industrial Co. | Zhao C.-L.,Nanchang University
Asian Journal of Chemistry | Year: 2014

The rapid analytical method to determine the trace of water in tobacco essence by Karl Fischer method. The results showed water in I cigarette addictive was determined, respectively by Karl Fischer method with satisfactory results. The RSD of this determination method was 1.65-2.54 % and recovery rate reached 93.46-106.15 %. This method has been applied for the determination of water in cigarette addictive. The content of total water was 1.49-5.74 %.


Tan C.,Jiangnan University | Xie J.,Jiangnan University | Zhang X.,Jiangnan University | Cai J.,China Tobacco Jiangxi Industrial Co. | And 2 more authors.
Food Hydrocolloids | Year: 2016

This study developed the polysaccharide-based nanoparticles by the polyelectrolyte complexation between chitosan (CS) and gum arabic (GA) as novel delivery systems for curcumin. Optimization of parameters affecting the formulation of such nanocarriers was performed by means of dynamic light scattering and fluorescence analysis. It was demonstrated that at pH 4.0 and 1:1 mixing ratio of CS to GA, the two biopolymers can form hydrophilic, monodisperse and highly positively charged colloidal nanoparticles. Fourier-transform infrared and X-ray diffraction further confirmed their electrostatic interaction. Subsequently, the formulations and stability of nanoparticles loaded with curcumin were compared. The optimum formulation was found to be Tween 80/egg yolk phospholipid (1:1, w/w), curcumin/emulsifier (0.5:5, w/w) and curcumin concentration initially prepared (4%, w/w). The developed nanoparticles showed the average diameter in the range of 250-290 nm. The curcumin encapsulation efficiency and loading content respectively exceeded 90% and 3.8%, with a retention rate higher than 85% during storage. Additionally, whatever the antioxidant model was, the antioxidant activities of curcumin were significantly enhanced by nanoencapsulation. Furthermore, compared to emulsion without biopolymer coating, CS-GA nanoparticles can improve the stability and delay the release of curcumin in a simulated gastrointestinal environment. These findings suggested that CS-GA nanoparticles could be used as an ideal carrier to deliver hydrophobic bioactive ingredients like curcumin in functional foods. © 2016 Elsevier Ltd.


Tang P.-P.,Hefei University of Technology | Cai J.-B.,China Tobacco Jiangxi Industrial Co. | Cai J.-B.,Hefei University of Technology | Gao Y.,Hefei University of Technology | Su Q.-D.,Hefei University of Technology
Journal of the Chinese Chemical Society | Year: 2010

Amolecular recognition bionic solid phase extraction (SPE) column for separation of glucosides has been prepared using a positively charged β-glucosylamidine as the ligand inwhich a glyconmoiety is connected via an N-glycoside linkage. β-Glucosylamidine, highly potent and selective inhibitors of β-glycosidase, is immobilized through a one-step synthesize procedure involving the addition of β-glucosylamine and 2-iminothiolane. HCl simultaneously to a matrix modified with maleimido groups via an appropriate spacer to give a molecular recognition absorbent for β-glucosides. N-octyl-β-D-glucopyranoside and β-D-galactopyranoside or α-D-mannopyranoside was directly chromatographed through the bionic chromatographic column, resulting in a much stronger retention of β-D-glucopyranoside than β-D-galactopyranoside and α-D-mannopyranoside. The retained glucopyranoside could only be eluted by glucose solution. This indicates that the binding of the glucoside was of specific nature that corresponds to the glycon substrate specificity of the glucoside. The ease of preparation and the selective nature of the molecular recognition bionic chromatography should promise a large-scale preparation of the molecular recognition adsorbent for the purification and removal of glucosides according to their glycon substrate specificity.


PubMed | China Tobacco Jiangxi Industrial Co.
Type: Journal Article | Journal: Zhongguo Zhong yao za zhi = Zhongguo zhongyao zazhi = China journal of Chinese materia medica | Year: 2012

In this study, products of psoralen pyrolysis were detected using a solid pyrolysis apparatus and synchrotron radiation vacuum ultraviolet photoionization mass spectrum (SVUV-PIMS). The pyrolytic kinetics of psoralen was also studied by calculating its initial pyrolytic route in quantum chemistry. According to the findings with SVUV-PIMS, three pyrolytic products were observed, CO, C9H6O and C10H6O2. Theoretically, three fragment pathways were calculated for psoralen, in which the major primary decomposition route was de-CO, and the major secondary decomposition reaction was de-CO reaction of de-CO products.

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