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Wang H.,Ministry of Forestry Bioethanol Research Center | Gong J.,National Engineering Laboratory for Rice and Byproducts Processing | Gong J.,Key Laboratory of Cultivation and Protection for Non Wood Forest Trees
Journal of the Chinese Cereals and Oils Association | Year: 2015

This paper is aimed to investigate the decoloring technology of cold-pressed crude camellia oil (COASO) so as to provide basis for preparation of colorless cosmetic oil with high quality. Take cold-pressed crude camellia oil (≤65℃) as material, decoloring technology was optimized through single factor and orthogonal experiments. The optimum decolorizing conditions were as follows: the dosage of compound decolorant was 3.5% (m/m), the ratio of bamboo charcoal to activated clay was 2:1(m/m), temperature was 60℃, and time was 30 min. Under such conditions, the maximum rate of decolorization reached (98.2±0.1)% (n=4), the effect of the dosage of compound decolorant on the rate of decolorization reached a significant level (P<0.01). At the condition of normal temperature with and without light, its color values will come back a little more, while at the condition of low temperature with and without light, the color values of the colorless cold-pressed camelliae oil was kept at Y0R0 during the 90 d period. Compared cosmetic and medical camelliae oil reported in literatures with one of this study, the quality of our samples was better than the formers. The decoloring efficiency of this technology was higher than others. Furthermore, due to the low temperature, the bioactive components in cold-pressed crude camelliae oil can be free from destruction to the utmost. In order to ensure the quality stability of colorless camelliae oil cold-pressed, it should be preserved under condition of low temperature and without light. The samples of colorless cold-pressed camelliae oil made in this study are excellent raw material for preparation of skin-care cosmetics. ©, 2015, Editorial Department, Chinese Cereals and Oils Association. All right reserved. Source


Wang H.,Bioethanol Research Center | Gong J.,National Engineering Laboratory for Rice and Byproducts Processing | Gong J.,Key Laboratory of Cultivation and Protection for Non Wood Forest Trees
Journal of the Chinese Cereals and Oils Association | Year: 2015

The paper was aimed to investigate the effect of decolorization on Camellia oleifera Abel seed oil quality (COASO) cold-pressed. Crude COASO prepared under low temperature (≤65℃) had been taken as the material and bamboo charcoal/activated clay as compound decolorant; the mainly important indexes including physicochemical index, main bioactive components in COASO, fatty acid composition & content, sensory quality and rheological properties were measured before and after the decolorization process. Decolorization technology was used in the study could produce a colorless state (Y0R0) to realize COASO cold-pressed. After decolorization, the acid value and peroxide value of COASO were reduced to a extremely low level, i.e. 0.05 mg/g-1 and 0.52 mmol/kg-1 respectively; except carotenoid, bioactive components in COASO have not been significantly affected during the process of decolorization; for the flavor of COASO, its average score was only 0.3 points, in a state of almost tasteless after decolorization; in addition, the decolorization process did not change the fatty acid composition and the content of COASO; furthermore, no obvious influence on the rheological properties was observed. The result indicated that the decolorization treatment could not only make the COASO cold-pressed realize the demand of colorless and tasteless of cosmetic oil, without damage on bioactive components in COASO, but also could improve its property of preservation, with no adverse effects shown on other important quality characteristics. © 2015, Editorial Department, Chinese Cereals and Oils Association. All right reserved. Source


Peng X.-L.,Central South University of forestry and Technology | Peng X.-L.,National Engineering Laboratory for Rice and Byproducts Processing | Li Z.-H.,Central South University of forestry and Technology | Li Z.-H.,National Engineering Laboratory for Rice and Byproducts Processing | Qiang D.-Z.,Central South University of forestry and Technology
Proceedings of 2012 International Conference on Biobase Material Science and Engineering, BMSE 2012 | Year: 2012

This essay established the determination of cadmium content in the food paper and plastic packaging materials with wet digestion-flame atomic absorption spectrometry. The detection limit and relative standard deviations of cadmium were 0.0056μg/ml and 1.93%. The recoveries of cadmium ranged from 91.92% to 96.37%. The method has the advantages of low detection limit, high accuracy and good precision. © 2012 IEEE. Source


Peng X.,Central South University of forestry and Technology | Peng X.,National Engineering Laboratory for Rice and Byproducts Processing | Li Z.,Central South University of forestry and Technology | Li Z.,National Engineering Laboratory for Rice and Byproducts Processing | And 2 more authors.
Journal of Chinese Institute of Food Science and Technology | Year: 2013

A method for determining lead and cadmium content in the paper and plastic packaging materials with wet digestion-flame atomic absorption spectrometry was developed. The detection limit and relative standard deviations of lead were 0.029 μg/mL and 1.12%, the recoveries of lead ranged from 93.77% to 96.14%; The detection limit and relative standard deviations of cadmium were 0.0056 μg/mL and 1.93%, the recoveries of cadmium ranged from 91.92% to 96.37%. The method has the advantages of low detection limit, high accuracy and good precision. Source


Zheng Y.-J.,National Engineering Laboratory for Rice and Byproducts Processing | Zheng Y.-J.,South University of Science and Technology of China | Chen R.,National Engineering Laboratory for Rice and Byproducts Processing | Chen R.,South University of Science and Technology of China | And 2 more authors.
Chinese Traditional and Herbal Drugs | Year: 2014

Objective: To study the characteristics of 2-C-methyl-D-erythritol 4-phosphate cytidylytransferase (MCT) gene and to predict the structure and function site of MCT. Methods: Based on MCT gene of Picrorhiza kurrooa, NCBI website and bio-informatics software were used to predict and analyze the base distribution, amino acid composition, hydrophilicity or hydrophobicity, and secondary and three-level structures of hyper-conservative region. The results were compared with MCT gene sequences in other eight species and the related evolution analysis was followed. Results: The mRNA sequence of MCT gene in P. kurrooa was 1216 bp (GenBank: JQ991625.1), coding the protein containing 399 amino acids, and the relative molecular mass of protein was 44448.5 with 10.0% Ser in volume; In polypeptide, hydrophobic amino acid was 59.5% in volume, and the average hydropathicity was 0.050; The homology was found as high as 99% compared with MCT gene in Salvia miltiorrhiza. Conclusion: The MCT gene in P. kurrooa was quite stable and the coded protein was hydrophobic, which was quite conservative in evolution; The sequence information in conservative region gained in the test provides the basis for clone ofnovel gene in other species. ©, 2014, Editorial Office of Chinese Traditional and Herbal Drugs. All right reserved. Source

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