Songming Zhu
Zhejiang University
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Publication
Featured researches published by Songming Zhu.
Analyst | 2013
Xishan Guo; Jinming Jian; Liwei Lin; Hanyu Zhu; Songming Zhu
A novel gas sensor based on composite films of poly(3,4-ethylenedioxythiophene)/poly(styrenesulfonate) (PEDOT/PSS) and single-walled carbon nanotubes (SWCNTs) was fabricated for the detection of fishy trimethylamine (TMA) vapor. The SWCNTs were functionalized by O2 plasma treatment to improve their solubility in the polymeric matrix, and alternative current dielectrophoresis was utilized for the first time to assemble the PEDOT/PSS-SWCNTs composite film to enhance the response to TMA molecules. The high resolution transmission electron microscopy (HR-TEM) images showed that the SWCNTs maintained their bulk structure after O2 plasma functionalization. The scanning electron microscopy (SEM) images of the composite film showed that the oxidized SWCNTs were orderly arranged and uniformly dispersed into the polymer by dielectrophoresis. Compositional analyses of SWCNTs by X-ray photoelectron spectroscopy (XPS) suggested that O2 plasma functionalization could remove amorphous carbon from the nanotube surface and introduce more hydrophilic oxygen-containing groups, leading to the improvement of SWCNTs solubility in the polymeric matrix. Gas sensitivities of the composite films largely relied on the treatment conditions. Compared to the raw or acid-treated SWCNTs-doped composite films, the film doped with SWCNTs modified by O2 plasma at 30 W for 3 min exhibited the most sensitive and stable response characteristics to ppb-level TMA gas.
Sensors | 2014
Chennan Zhou; X. Zhang; Xinxin Huang; Xishan Guo; Qiang Cai; Songming Zhu
A colloidal gold immunochromatographic assay (GICA) was developed for rapid detection of chloramphenicol (CAP) residues in aquatic products. A nitrocellulose (NC) membrane was used as the carrier, and the polyclonal CAP antibody was used as the marker protein. The average diameter of as-prepared colloidal gold nanoparticles (AuNPs) was about 20 nm. The optimal pH value of colloidal gold solutions and the amount of the antibody of CAP were 8.0 and 7.2 μg/mL, respectively. The CAP antibody was immobilized onto the conjugate pad after purification. The CAP conjugate and goat anti-rabbit IgG (secondary antibody) were coated onto the NC membrane. Next, the non-specific sites were blocked with 1% bovine serum albumin. The minimum detectable concentration of CAP in standard solution is 0.5 ng/mL, with good reproducibility. For the real samples from crucian carps injected with a single-dose of CAP in the dorsal muscles, the minimum detectable concentration of CAP residues was 0.5 μg/kg. The chromatographic analysis time was less than 10 min, and the strip had a long storage lifetime of more than 90 days at different temperatures. The strips provide a means for rapid detection of CAP residues in aquatic products.
International Journal of Food Properties | 2014
Songming Zhu; Minsheng Zhou; Yong Yu; Jianping Li; Jinsong He
The coagulations of soft-shell turtle egg white at high pressure or at high temperature were investigated and compared to chicken egg white. Unlike chicken egg white, no coagulation of soft-shell turtle egg white was observed after high-pressure processing (HPP; 200–600 MPa) or heating treatment (75°C). Basic amino acids, histidine, lysine, and arginine were present at higher percentages in soft-shell turtle egg white proteins than in chicken egg white proteins. Sodium dodecyl sulfate/polyacrylamide gel electrophoresis showed that the intensities of soft-shell turtle egg white components were balanced, there were more components with high molecular mass in soft-shell turtle egg white, and that aggregates formed in both soft-shell turtle egg white and chicken egg white. This work revealed some differences in soft-shell turtle egg white compositions. The low protein content in egg white was responsible for the non-coagulation of soft-shell turtle egg white in response to high pressure or temperature.
2012 Dallas, Texas, July 29 - August 1, 2012 | 2012
Jing Wang; Yong Yu; Jinsong He; Songming Zhu; Jianping Li
In this study, high pressure processing (HPP) was applied to extract polysaccharide from Lentinus edodes stems (LES) at ambient temperature. The effects of pressure,solvent-to-solid ratio and holding time on the yield of polysaccharide were studied by quadratic rotation-orthogonal composite experimental design. The linear effect of solvent-to-solid ratio was significant (p < 0.01). The interaction effect of pressure x holding time was significant (p < 0.05). The quadratic effects of pressure and solvent-to-solid ratio were significant (p < 0.05, p < 0.01, respectively). The optimal condition was: pressure at 210 MPa, solvent-to-solid ratio at 26 mL per 1g and holding time at 20 min, and the maximum yield of polysaccharide was 53.62 mg/g. Comparing to the conventional extraction method, HPP shows dominant advantages with higher yield and shorter extraction time. The use of HPP to extract polysaccharide from LES is a potential alternative to conventional methods.
Journal of Food Quality | 2018
Yong Yu; Xiuping Jiang; Hosahalli S. Ramaswamy; Songming Zhu; Huanhuan Li
Effect of high pressure (HP) treatment (200–600u2009MPa; 0–20u2009min) on quality of fresh-cut carrot slices was evaluated after presoaking in selected calcium salt solutions (1% calcium chloride, 1% calcium lactate, 1% calcium gluconate, and distilled water as control) for one hour. Results showed that calcium chloride (CaCl2) solution pretreatment was most effective for preserving the hardness of carrot slices at 400 and 600u2009MPa and this treatment also resulted in the least amount of color change in carrots, followed by calcium lactate, gluconate, and control pretreatments. The average sensory evaluation scores during 9 days of refrigerated storage at 4°C in control, CaCl2, calcium lactate, and calcium gluconate presoaking treatments followed by HP treatment were 6.4 ± 0.5, 8.0 ± 0.5, 7.8 ± 0.4, and 7.6 ± 0.3, respectively, on a zero to 9 scale for quality.
High Pressure Research | 2018
Wei Sun; Jianping Li; Hosahalli S. Ramaswamy; Yong Yu; Chunfang Wang; Songming Zhu
ABSTRACT Six organic solvents (methanol, ethanol, acetone, ethyl acetate, n-hexane and petroleum ether) were evaluated for their adiabatic compression heating (ACH) characteristics. A specially designed data acquisition system was used to gather ACH data under different high pressure treatment conditions: pressure, 0.1–400u2005MPa and initial temperature, 5°C and 25°C. Petroleum ether had the highest temperature increase (44°C) followed by n-hexane, ethyl acetate, acetone, methanol and ethanol (33°C) under the experiment conditions. The ACH values for the solvents exhibited a decreasing trend with an increase in pressure and only slightly affected by the initial temperature. An empirical equation was obtained for predicting the ACH of the solvents as a function of pressure at 5°C and 25°C which gave a good fit (u2009>u20090.99) with experimental data. Thermal effect due to ACH of solvents during the high pressure processing is crucial but neglected most often when studying high pressure extraction.
Food and Bioprocess Technology | 2018
Wei Luo; Silvia Tappi; Chunfang Wang; Yong Yu; Songming Zhu; Pietro Rocculi
Osmotic dehydration (OD) is the most important procedure for obtaining candied wumei (Prunus mume), which is a very popular snack in Eastern Asian countries. This study aims to evaluate the effects of high hydrostatic pressure (HHP) pre-treatment (50–400xa0MPa) on the mass transfer kinetics and on the water diffusivity of wumei fruit during OD and to investigate the effect on water distribution and cell viability aspects. The results showed that HHP increased initial rate and effective diffusivity of mass transfer values compared to non-treated samples. Time domain nuclear magnetic resonance revealed that, upon HHP treatment, the water redistributed in vacuole, cytoplasm/extracellular spaces, and cell wall/membrane. The application of 400xa0MPa probably caused some irreversible damages to the cell membranes. The cell viability study determined by fluorescein diacetate staining showed a loss of cell viability at pressures higher than 200xa0MPa. HHP exhibited an effective pre-treatment to increase mass transfer of wumei fruit during OD process.
Food and Bioprocess Technology | 2018
Wei Luo; Silvia Tappi; Chunfang Wang; Yong Yu; Songming Zhu; Marco Dalla Rosa; Pietro Rocculi
Candied wumei fruit (Prunus mume) is a traditional product in Eastern Asian countries generally obtained by a long osmotic dehydration (OD) process. This study evaluated the effect of the application of high hydrostatic pressure (HHP) and heating pre-treatments to accelerate the OD process on some bioactive compound content, antioxidant activity, and volatile profile of wumei fruit. Whole fruits were subjected to HPP treatment (50xa0MPa for 1xa0min) and heating (100xa0°C for 1xa0min) and then to OD in a 40% sucrose solution for 5xa0days. Results showed that both heating and HPP pre-treatment increased mass transfer in a comparable way; however, HPP allowed a significant higher retention of antioxidant compounds and activity compared with the heating treatment, resulting in similar values to the untreated product. Moreover, HPP promoted the release of various volatile components resulting in a richer volatile profile compared with both control and heat-treated samples. Hence, HPP showed good potentiality as an alternative non-thermal pre-treatment for the production of candied wumei fruit characterized by high nutritional and sensorial properties.
Food Control | 2013
Xishan Guo; X. Zhang; Qiang Cai; Tao Shen; Songming Zhu
Food Hydrocolloids | 2013
Jin-Song He; Tai-Hua Mu; Xishan Guo; Songming Zhu; Norihiro Azuma; Choemon Kanno