INTERNATIONAL JOURNAL OF FOOD MICROBIOLOGY
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2015
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IF 3.082
Lei Rao,Zhenzhen Xu,Yongtao Wang,Feng Zhao,Xiaosong Hu,Xiaojun Liao
The objective of this study was to investigate the inactivation of the Bacillus subtilis spores by high pressure CO 2 combined with high temperature (HPCD + HT) and to analyze the clumping effect of the spores on their HPCD + HT resistance. The spores of B . subtilis were subjected to heat at 0.1 MPa and HPCD at 6.5–25 MPa, and 82 °C, 86 °C, and 91 °C for 0–120 min. The spores were effectively inactivated by HPCD + HT, but a protective effect on the spores was also found, which was closely correlated to the pressure, temperature and time. The spores treated by HPCD + HT at 6.5 and 10 MPa exhibited a two-stage inactivation curve of shoulder and log-linear regions whereas the spores at 15–25 MPa exhibited a three-stage inactivation curve of shoulder, log-linear and tailing regions, and these curves were well fitted to the Geeraerd model. Approximately 90% of pyridine-2,6-dicarboxylic acid (DPA) was released after HPCD + HT and the 90% DPA release time depend on the pressure and temperature. Moreover, the spore clumping in suspensions was examined by dynamic light scattering. The particle size of the spore suspensions increased with the increase of pressure, temperature and time, indicating the spore clumping. 0.1% Tween 80 as a surfactant inhibited the spore clumping and increased the inactivation ratio of the spores by HPCD + HT. These results indicated that the spore clumping enhanced the spores' resistance to HPCD + HT and induced a protective effect.
研究领域:
微生物学
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食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PROGRESS IN ORGANIC COATINGS
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2025
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IF 7.3
Chijia Wang,Shun Zhang,Siqiao Feng,Shuyi Liu,Haonan Liu,Qianqian Yin,Zihua Wang,Zhanjian Liu,Huaiyuan Wang
In recent years, the impact of filler surface groups on the protective qualities of epoxy resin coatings has garnered significant attention. This study has centered on the hydrophobic modification of mica fillers using fluorosilane (PFDTMS). Subsequently, the photocatalytic properties of titanium black (B-TiO 2 ) and Cobalt tetroxide (Co 3 O 4 ) were utilized to deposit hydroxyl radicals onto the fluorosilane surface, resulting in a configuration where hydrophilic groups encapsulate hydrophobic groups on the exterior of the filler. Furthermore, the study aimed to evaluate the anti-corrosion and wear resistance of these composite coatings under high-pressure CO 2 conditions. After undergoing a 72-hour high-pressure CO 2 corrosion test, the EP/UV-F/B-TiO 2 /Mica/Co 3 O 4 composite coating retained a substantial impedance modulus value of 3.648 × 10 9 Ω/cm 2 at 0.01 Hz, whereas the pure epoxy resin coating exhibited detachment and cracking from the substrate. These observations indicate that the epoxy composite coating, featuring its distinctive hydrophilic-hydrophobic configuration, possesses exceptional long-term corrosion resistance. In conclusion, this research presents encouraging prospects for the development of mica-based, resilient anti-corrosive fillers.
研究领域:
材料科学
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腐蚀与防护
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
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2024
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IF 8.3
Qianqian Yin,Chijia Wang,Yize Liu,Shuyi Liu,Jianxin Wang,Weihao Fan,Xueqing Wang,Huaiyuan Wang
organic-inorganic composite fillers were successfully prepared by a simple one-pot film-like coating of poly (α-cyanoethyl acrylate) (PECA) on mica. Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), and thermogravimetric analysis (TG) were used to analyze the structure, morphology, and chemical composition of the organic-inorganic composite filler and pure mica in detail. The organic-inorganic composite filler was added to epoxy resin to prepare a composite coating with long-lasting anti-corrosion and wear-resistance properties. The composite coating was characterized by electrochemical impedance spectroscopy (EIS), high-pressure CO 2 corrosion tests, friction performance tests, differential scanning calorimetry (DSC), and adhesion performance tests. The mechanical test results showed that the average wear quality of the EP/P 30 &M (8/2) composite coating prepared with the modified filler was reduced to 65.7 % of that of the EP/MICA (8/2) coating. The addition of the modified filler to the coating substantially improved the wear resistance and crosslinking of the composite coating, reduced the porosity, increased the density, and effectively improved the overall performance of the composite coating. The results of high-pressure CO 2 corrosion tests in harsh environments and electrochemical impedance spectroscopy showed that the composite coating had excellent barrier capacity. After high-pressure CO 2 corrosion tests, the EP/P 20 &M (9/1) composite coating still has a high impedance modulus value of 6.348 × 10 10 Ω/cm 2 at 0.01 Hz, which is 5 orders of magnitude higher than that of the pure epoxy coating, and showsed excellent long-lasting corrosion resistance in EIS tests. This study provides new ideas for the industrial application of mica and the preparation of long-lasting anti-corrosion coatings.
研究领域:
材料科学
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腐蚀与防护
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高分子化学
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
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2023
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IF 8.8
Lijuan Zhu,Wanfeng Hu,Ayesha Murtaza,Aamir Iqbal,Mengjie Kong,Jiao Zhang,Jiaxing Li,Xiaoyun Xu,Siyi Pan
Fresh-cut Chinese water chestnut (CWC) was treated with high pressure CO 2 (HPCD) to inhibit the browning reactions, and the underlying mechanism was investigated in this study. Results showed that HPCD at 2 MPa pressure significantly inhibited lipoxygenase activity and enhanced superoxide dismutase activity, leading to decreased malondialdehyde and H 2 O 2 contents in surface tissue. Moreover, HPCD could reduce total phenols/flavonoids content of surface tissue. Compare with control, homoeriodictyol, hesperetin, and isorhamnetin contents of 2 MPa HPCD-treated samples on day 10 were reduced by 95.72%, 94.31%, and 94.02%, respectively. Furthermore, HPCD treatment enhanced antioxidant enzyme activities, and improved the O 2 – scavenging ability and reducing power of inner tissue. In conclusion, by regulating ROS and membrane lipid metabolism, HPCD treatment with appropriate pressure could retard the biosynthesis of flavonoids and enzymatic oxidation of phenolic compounds in surface tissue, and enhance antioxidant activity of inner tissue, thereby, delaying the quality deterioration of fresh-cut CWC.
研究领域:
食品科学
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植物生理学
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采后技术
✓ 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）