Food Science & Nutrition
·
2021
·Vol. 9
·期 7
·3863-3872
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IF 2.863
He Yangbo,Li Yongfu,Luo Xingbang,Li Guolin,Duan Zhaoyan,Chen Chaojun
In the present study, we investigated the effects of thermal preservation, such as pasteurization, and nonthermal preservation, including irradiation, sodium dehydroacetate (SDHA), and nisin, on the quality of red sour soup after storage. Single-factor experiments were used to optimize the parameters of different processing technologies, and the best irradiation dose and heating temperature were 4 kGy and 85℃, respectively. The optimal additive amounts of SDHA and nisin were 150 mg/500 g. During the shelf storage experiment, prepared red sour soup was stored at room temperature in the glass bottles, and further analyses were carried out up to 5 weeks of storage. The quality of red sour soup was evaluated by microflora and sensory analysis. The results showed that Lactobacillus , Streptomyces, Pediococcus , Pichia , Kazachstania , and Candida were the main microorganisms in all samples, and there were no harmful microorganisms. The sensorial attributes were observed, including different parameters, such as odor, organic acid content, color, taste, texture, apparent viscosity, and thixotropy. All of the data showed that the irradiated groups were more dramatically changed compared with the other groups, while these changes did not directly affect the sensory quality of the products. Consequently, irradiation could be used as an ideal quality preservation method for the red sour soup to reduce the impact of heat treatment and chemical additives on the quality of characteristic food.
研究领域:
食品科学
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微生物学
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产品关联
DOI
PubMed
高影响因子
Membranes
·
2023
·Vol. 13
·期 9
·759
·
IF 4.2
Fanxin Kong,Lian You,Dingwen Zhang,Guangdong Sun,Jinfu Chen
Polysulfone (PSf) membranes typically have a negligible rejection of salts due to the intrinsic larger pore size and wide pore size distribution. In this work, a facile and scalable heat treatment was proposed to increase the salt rejection. The influence of heat treatment on the structure and performance of PSf membranes was systematically investigated. The average pore size decreased from 9.94 ± 5.5 nm for pristine membranes to 1.18 ± 0.19 nm with the increase in temperature to 50 °C, while the corresponding porosity decreased from 2.07% to 0.13%. Meanwhile, the thickness of the sponge structure decreased from 20.20 to 11.5 μm as the heat treatment temperature increased to 50 °C. The MWCO of PSf decreased from 290,000 Da to 120 Da, whereas the membrane pore size decreased from 5.5 to 0.19 nm. Correspondingly, the water flux decreased from 1545 to 27.24 L·m−2·h−1, while the rejection ratio increased from 3.1% to 74.0% for Na2SO4, from 1.3% to 48.2% for MgSO4, and from 0.6% to 23.8% for NaCl. Meanwhile, mechanism analysis indicated that the water evaporation in the membranes resulted in the shrinkage of the membrane pores and decrease in the average pore size, thus improving the separation performance. In addition, the desalting performance of the heat-treated membranes for real actual industrial wastewater was improved. This provides a facile and scalable route for PSf membrane applications for enhanced desalination.Keywords:PSf membrane;heat treatment;rejection performance
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials
·
2022
·Vol. 15
·期 4
·1367
·
IF 3.748
Fubing Gui,Yong Huang,Menghan Wu,Xilai Lu,Yongming Hu,Wanping Chen
A high long-term stability is crucial for room-temperature gas-sensitive metal oxide semiconductors (MOSs) to find practical applications. A series of Pd-SnO2mixtures with 2, 5, and 10 wt% Pd separately were prepared from SnO2and Pd powders. Through pressing and sintering, Pd-SnO2composite nanoceramics have been successfully prepared from the mixtures, which show responses of 50, 100, and 60 to 0.04% CO-20% O2-N2at room temperature for samples of 2, 5, and 10 wt% Pd, respectively. The room-temperature CO-sensing characteristics were degraded obviously after dozens of days’ aging for all samples. For samples of 5 wt% Pd, the response to CO was decreased by a factor of 4 after 20 days of aging. Fortunately, some rather mild heat treatments will quite effectively reactivate those aged samples. Heat treatment at 150 °C for 15 min in air tripled the response to CO for a 20 days-aged sample of 5 wt% Pd. It is proposed that the deposition of impurity gases in air on Pd in Pd-SnO2composite nanoceramics has resulted in the observed aging, while their desorption from Pd through mild heat treatments leads to the reactivation. More studies on aging and reactivation of room-temperature gas sensitive MOSs should be conducted to achieve high long-term stability for room-temperature MOS gas sensors.Keywords:CO;sensors;SnO2;aging;heat treatment;recover
研究领域:
材料科学
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传感器技术
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DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Qi Li,Dejun Sun,Feng Chen,Haoran Xu,Zhenghe Xu
Hydrothermal treatment (HT) can effectively dehydrate and reduce oily sludge (OS) volume, but the resulting hydrothermal oily sludge (HOS) presents greater challenges for washing than the initial oily sludge (IOS). This study examines the effects of HT on OS by analyzing changes in water, oil, and solid. Results indicate that HT considerably decreases the water content in OS while increasing resin and asphaltenes contents. In addition, condensation, side-chain scission, and oxidation reactions occur during the HT process, resulting in coking, agglomeration, and an increase in oxygen-containing groups. This increase, further confirmed by X-ray photoelectron spectroscopy (XPS), enhances the interaction between oil and solids. Calcite, the most prevalent solid-phase component, may form a calcium bridge with the oxygen-containing groups. Moreover, HT reduces the solid particle size, thereby increasing the oil–solid contact area. Interestingly, the process of deasphalting diminishes the interaction between oil and solids, facilitating sludge washing. After washing, the residual oil content in HOS is reduced to less than 0.34%. This study elucidates why HOS is challenging to separate from oil and solids and introduces a novel method that combines dodecylbenzene sulfonic acid (DBSA)-assisted heptane deasphalting with conventional washing techniques. This method shows promise for applications in OS affected by weathering processes.
研究领域:
环境科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
Membranes
·
2023
·Vol. 13
·期 2
·225
·
IF 4.2
Yubo Xu,Long-Fei Ren,Jun Li,Chengyi Wang,Yangbo Qiu,Jiahui Shao,Yiliang He
Membrane distillation (MD) is attractive for water reclamation due to the fact of its unique characteristics. However, membrane wetting becomes an obstacle to its further application. In this paper, a novel hydrophobic polyvinylidene fluoride/poly(vinyl pyrrolidone) (PVDF/PVP) membrane was fabricated by electrospinning and solvothermal treatment. The electrospun membranes prepared by electrospinning showed a multilevel interconnected nanofibrous structure. Then, a solvothermal treatment introduced the micro/nanostructure to the membrane with high roughness (Ra= 598 nm), thereby the water contact angle of the membrane increased to 158.3 ± 2.2°. Owing to the superior hydrophobicity, the membrane presented high resistance to wetting in both NaCl and SDS solutions. Compared to the pristine PVDF membrane, which showed wetting with a flux decline (120 min for 0.05 mM surfactant solution treatment), the prepared membrane showed outstanding stability over 600 min, even in 0.2 mM surfactant solutions. These results confirm a simple method for anti-wetting hydrophobic membrane preparation, which presented universal significance to direct contact membrane distillation (DCMD) for industrial application.Keywords:membrane distillation;membrane wetting;electrospinning;solvothermal treatment
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
·
2019
·
IF 3.714
He Li,Xiang-Yi Tang,Chun-Jian Wu,Shu-Juan Yu
The 2,3-dihydro-3,5-dihydroxy-6-methyl-4(H)-pyran-4-one (DDMP) is one of the Mallard reaction product with intense bitter and strong antioxidant activity . Insight into DDMP formation pathways is important to manage Maillard reaction products quality. In this work, wet- and dry-heating glucose-amino acid model reactions were investigated to understand the DDMP formation pathways. Lysine and proline facilitated the DDMP generation in wet- and dry-heating system, respectively, suggesting the reaction intensity and amino acid properties are primary factors mediating DDMP generation. Fundamental mechanism on DDMP formation or inhibition was evaluated via quantitatively monitoring enolization products, which suggested that the formation of DDMP was facilitated at lower moisture content condition caused by more 1-deoxyglucosone (1-DG) generation via 2,3-enolization. However, increasing moisture content resulted in the decay of DDMP because of the transformation of 2,3-enolization to 1,2-enolization, which inhibited DDMP generation but transformed to form 5-hydroxymethylfurfural (HMF).
研究领域:
食品科学
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生物化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Yushi Wang,Mengjiao Xing,Lijia Duan,Aya Fatihi,Miao Ji,Danli Wang,Ling Li,Gongshuai Song,Tinglan Yuan,Jinyan Gong
In this study, complexes of chlorogenic acid (CA) with starch from different sources were prepared by thermal treatment (70 °C, 20 min) and ultrasound (450 W, 20 kHz, 25 °C, 20 min). Both ultrasound and thermal treatment are effective methods for preparing starch-CA complexes, but the two treatments have different effects on different starches. Characterization of the complexes prepared using the two methods showed that thermal treatment and ultrasound reduced the crystallinity of starch to some extent, with thermal treatment having a greater effect. Thermal treatment also reduced the amount of double-helix structures in starch. In contrast, ultrasound was relatively mild and had less effect on starch granular structure. However, these two methods promoted the binding of CA, thereby increasing the crystallinity of starch and forming a more ordered and compact structure, which, to some extent hindered the enzymatic degradation of starch. Moreover, the RDS of starch-CA complexes were reduced to different degrees, with the most significant changes in U (PS-CA) and T (CS-CA), which were reduced by 5.96 % and 4.55 %, respectively.
研究领域:
食品科学
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生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2020
·
IF 6.306
Kai Zhou,Francesca Patrignani,Yuan-Ming Sun,Rosalba Lanciotti,Zhen-Lin Xu
Ethyl carbamate (EC), a genotoxic and carcinogenic compound in soy sauce accumulated during thermal processes, has raised public health concern for its multipoint potential carcinogenic risk to human. In this work, based on the analysis of EC accumulation during thermal processes of soy sauce, ornithine and quercetin were added before thermal processes to reduce EC accumulation. A reduction rate of 23.7–63.8% in simulated solution was founded. Kinetic studies indicated that ornithine was a byproduct of alcoholysis reaction when EC formed, while quercetin could compete with the precursor ethanol and react with carbamyl compounds, which therefore prevented EC accumulation. A maximum of 47.2% decrease of EC in soy sauce was achieved, and no remarkable changes in volatile compounds profile and color of soy sauce were found. In conclusion, the addition of quercetin and ornithine before thermal processes may be preferable for the controlling of EC content in soy sauce.
研究领域:
食品科学
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毒理学
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公共卫生
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产品关联
DOI
PubMed
高影响因子
WASTE MANAGEMENT
·
2022
·
IF 8.816
Zhikun Zhang,Yanli Wang,Yuqi Zhang,Boxiong Shen,Jiao Ma,Lina Liu
The environmental risk of heavy metals in hazardous municipal solid waste incineration fly ash (FA) is one of the most important concerns for its safely treating and disposing. This study investigated the stabilization behavior of heavy metals in FA using coal fly ash (CFA) as an additive via hydrothermal treatment. The effects of water washing pre-treatment and FA/CFA ratio on leaching behavior, speciation evolution, and risk assessment of heavy metals were studied. The results showed that 96.6–98.0 % of Cl can be effectively removed by water washing pre-treatment and hydrothermal treatment. Most heavy metals (Cr, Cu, Ni, Pb and Zn) (>91.5 %) were stabilized in the hydrothermal product, rather than transferred to liquid phase. Tobermorite can be synthesized by adjusting Ca/Si ratio with the addition of CFA. The heavy metals were transferred into more stable residue fractions with increasing CFA addition, which resulted in the significant reduction of leaching concentrations and risk assessment code (RAC) of heavy metals. Among, the product with 30% CFA exhibited the most superior performance with the lowest leaching concentrations of heavy metals and RAC was at no risk level (<1). In addition, the economic performance of hydrothermal treatment exhibited a potential advantage by comparing with FA-to-cement, FA-to-glass slags and FA-to-chelating agent & cement solidification/stabilization. Therefore, the hydrothermal treatment coupled with water washing pre-treatment would be a promising method for the detoxification of FA, as well as synergistic treatment of FA and CFA.
研究领域:
环境科学
·
废物处理
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产品关联
DOI
PubMed
高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 15
·2259
·
IF 5.3
Haixia Wu,Zhenxu Lin,Jie Song,Yi Zhang,Yanqing Guo,Wenxing Zhang,Rui Huang
Zero-dimensional (0D) tin halide perovskites feature extraordinary properties, such as broadband emission, high photoluminescence quantum yield, and self-absorption-free characteristics. The innovation of synthesis approaches for high-quality 0D tin halide perovskites has facilitated the flourishing development of perovskite-based optoelectronic devices in recent years. However, discovering an effective strategy to further enhance their emission efficiency remains a considerable challenge. Herein, we report a unique strategy employing rapid heat treatment to attain efficient self-trapped exciton (STE) emission in Cs4SnBr6zero-dimensional perovskite. Compared to the pristine Cs4SnBr6, rapid thermal treatment (RTT) at 200 °C for a duration of 120 s results in an augmented STE emission with the photoluminescence (PL) quantum yield rising from an initial 50.1% to a substantial 64.7%. Temperature-dependent PL spectra analysis, Raman spectra, and PL decay traces reveal that the PL improvement is attributed to the appropriate electron–phonon coupling as well as the increased binding energies of STEs induced by the RTT. Our findings open up a new avenue for efficient luminescent 0D tin-halide perovskites toward the development of efficient optoelectronic devices based on 0D perovskites.Keywords:photoluminescence;self-trapped exciton;Cs4SnBr6;rapid thermal treatment
研究领域:
材料科学
·
光电学
·
光子学
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产品关联
DOI
PubMed
高影响因子
Journal of Nano Research
·
2015
·
IF 0.564
Jing Jing Shi,En Long Yang
The present study reports green electrospinning of polyvinyl alcohol (PVA) / citric acid nanofiber membranes, and the membranes were then crosslinked by heat treatment. The electric conductivity of the PVA aqueous solution increases rapidly and the growth slows down along with the increase of citric acid content. The viscosity of 13 wt% PVA aqueous solutions with citric acid had a small increase and remained stable in one week, which was suitable for electrospinning fibers. Porous, interconnected nonwoven nanofiber membranes were electrospun from a thoroughly mixing of PVA/ citric acid aqueous solution. The membranes were then heat treated at 140 °C for 2 h. The postelectrospinning crosslinked nanofiber membranes were insoluble in water, while the non-crosslinked electrospun nanofiber membranes dissolved instantaneously. FT-IR spectrum, X-ray diffraction, and DSC thermograms reveal that crosslinking of PVA nanofiber membranes occurred through esterfication reaction during heat treatment.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2021
·
IF 5.302
Le Fu,Bo Li,Guofu Xu,Jiwu Huang,Håkan Engqvist,Wei Xia
Thermal stability of nanocrystallites plays an important role in the manufacturing and application of nanocrystalline ceramics/glass-ceramics. This study explores the effects of thermal treatments on the microstructures of two ZrO 2 -SiO 2 nanocrystalline glass-ceramics (NCGCs), an undoped one and a yttria-doped one. The two as-sintered NCGCs were composed of tetragonal (t) and monoclinic (m) ZrO 2 nanocrystallites, and SiO 2 component was amorphous. t-ZrO 2 and m-ZrO 2 nanocrystallites were metastable during thermal treatment. The content of m-ZrO 2 in the undoped ZrO 2 -SiO 2 NCGC first increased after thermal treating at 850 °C for 5 h, then decreased after thermal treating at and above 950 °C. After thermal treating at 1250 °C for 5 h, t-ZrO 2 nanocrystallites experienced a rapid phase transformation during cooling, resulting the formation of 88.6 vol% m-ZrO 2 . Size-driven phase transformation was utilized to explain the metastability of t-ZrO 2 and m-ZrO 2 nanocrystallites. In contrast, the content of m-ZrO 2 in the yttria-doped ZrO 2 -SiO 2 NCGC continuously decreased with the increase of thermal treatment temperature. The addition of yttria improved the phase stability of t-ZrO 2 up to at least 1250 °C. Crystallite size of both t-ZrO 2 and m-ZrO 2 nanocrystallites increased with the increase of thermal treatment temperature in the two NCGCs. The presence of residual thermal stress in the as-sintered NCGCs changed the lattice spacing of t-ZrO 2 and m-ZrO 2 nanocrystallites, and the stress can be released after thermal treatment. Thermal treatment exerts significant influences on the microstructure of ZrO 2 -SiO 2 NCGCs.
研究领域:
材料科学
·
陶瓷学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）