JOURNAL OF FOOD SCIENCE
·
2021
·Vol. 86
·期 9
·4223-4243
·
IF 3.167
Jiaqiao Li,Wenting Li,Zeyuan Deng,Hongyan Li,Yan Yu,Bing Zhang
Bamboo( Phyllostachys edulis ) shoot was reported to be rich in phenolics. In the present study, free phenolics, conjugated phenolics, and insoluble-bound phenolics of oven-drying and freeze-drying bamboo shoot tips were extracted and separated, of which total phenolic content (TPC), total flavonoid content (TFC), and their antioxidant activities were determined. Phenolics of different binding forms were qualitatively analyzed using HPLC–ESI–QqQ-MS. A total of 22, 41, and 28 compounds were confirmed or tentatively identified in free, conjugated, and insoluble-bound phenolic extraction, respectively. The majority of the identified compounds were organic acids and phenolic acids. Oven-drying samples exhibited higher TPC (10.53–24.92 mg GAE/100 g DW) and TFC (5.80–33.27 mg CE/100 g DW) values, and stronger antioxidant activities (DPPH, ABTS, and FRAP) than freeze-drying (TPC: 1.67–15.28 mg GAE/100 g DW, TFC: 1.43–29.05 mg CE/100 g DW). Insoluble-bound phenolics were the major contributor to the total antioxidant activity. The present study investigated the phenolics composition and antioxidant activities of different binding forms in bamboo shoot tip comprehensively, and provided available information for their high-value deep-processing.
研究领域:
食品科学
·
植物化学
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产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 81
·77346-77357
·
IF 3.289
Lingling Wang,Xiuhua Zhao,Yuangang Zu,Weiwei Wu,Yuanyuan Li,Chang Zu,Yin Zhang
Ginkgo biloba extract nanoparticles were successfully prepared by the method of emulsion solvent evaporation combined with freeze-drying (ESE-FR). By the single-factor method, the optimal parameters were determined: the concentration of GBE was 5 mg mL−1, volume ratio of water to organic phase was 1 : 1, homogenate speed and time were 12 000 rpm and 3 min, respectively, and homogeneous pressure and times were 500 bar and 3, respectively. The mean particle size (MPS) of the GBE nano-emulsion prepared using the optimized conditions was 56.0 nm. SEM detection results indicated that the morphology of raw GBE was irregular. But the morphology of GBE nanoparticles was close to spherical and the particle size of GBE nanoparticles was much smaller than that of raw GBE. The particle size of the freeze-dried powder was 277.0 nm. The characteristics of prepared GBE nanoparticles were detected via XRD, DSC and TG, which showed that the crystal structure of GBE nanoparticles was the same as that of raw GBE. Through the test of solubility and dissolution in vitro, the solubility and dissolution of GBE nanoparticles in artificial gastric juice, artificial intestinal juice and deionized water were obviously improved compared with that of raw GBE. The results of bioavailability showed that the Area Under Plasma Concentration Curves (AUC) of flavonoids and terpene lactones in GBE nanoparticles were improved about 1.81 times and 1.75 times compared with that in raw GBE, respectively. In addition, the residual amounts of chloroform and ethanol were less than the ICH limit for class II.
研究领域:
药学
·
纳米技术
·
药理学
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产品关联
DOI
高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
·
2025
·
IF 6.6
Wenchao Liu,Yize Yin,Lijuan Wang,Chung Lim Law,Linlin Li,Weiwei Cao,Xu Duan,Guangyue Ren
This study examined how fatty acids of varying chain lengths influence the microwave freeze-drying (MFD) properties and cross-linking interactions in wheat starch-fatty acid complexes. The study revealed that fatty acids with extended carbon chains decreased the initial water content in wheat starch-fatty acid blends, thereby reducing the drying time. Long-chain complexes maintained a more stable freeze-drying rate with changes in experimental power compared to short-chain ones. When microwave power was raised from 0.5 to 2.5 W/g, the enthalpy shifts (ΔH) in melting peaks for starch-fatty acid complexes varied significantly: butyric acid blends showed a change of 176.71 J/g, octanoic acid 714.06 J/g, and myristic acid 1102.02 J/g. XRD revealed reductions in relative crystallinity by 12.87 %, 19.38 %, and 27.00 %. Raman spectroscopy showed peak width increases at 480 cm −1 of 8.22, 8.49, and 10.43, respectively. The extent to which wheat starch-fatty acid complexes were affected during MFD increased with the chain length of the fatty acids.
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DOI
高影响因子
Foods
·
2025
·Vol. 14
·期 12
·2142
·
IF 5.1
Zile Wang,Dongdong Chen,Xiaomei Zheng,Yuqing Li,Shaoqian Jiang,Yanfei Chen,Jingjian Jia,Libo Yu,Tao Peng
Staphylococcus aureus(S. aureus) poses a significant threat to public health and safety, and enhancing the monitoring ofS. aureusin food is essential to curb and prevent foodborne transmission. In order to obtain strains for more convenient and rapid use in quality control or quantitative analysis, this study designed a ready-to-use “ball-in-ball” microsphere based on a novel cryoprotectant combined with drop freeze-drying technology. When using a cryoprotectant that contains 1.5% bovine serum albumin, 4.5% trehalose, 8.2% polyethylene glycol 8000, and 4.1% D-mannitol, the survival rate ofS. aureuscan reach 98.2 ± 2.6%. This cryoprotectant effectively preventsS. aureusfrom shrinking, deforming, and damaging cell walls. Additionally, it shows desirable protective efficiency for other Gram-positive bacteria. The molding of microspheres is efficient and cost-effective, demonstrating good uniformity and stability without the need for pre-freezing. The moisture content and the count ofS. aureusshowed no significant changes over 90 days at −20 °C. In the simulated contaminated sample, the recovery rate ofS. aureusin milk and green tea was 83.1–93.7%. This study could provide a practical approach to improve the monitoring efficiency ofS. aureusand shows potential as a generalized strategy for preparing ready-to-use strains related to food safety.
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DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Long Ni,Hang Ye,Yuanyu Chang,Ke Yang,Yinfu Luo,Liwei Yan,Shuang Xia,Mei Liang,Shengtai Zhou,Huawei Zou
A series of silica aerogel (SiA)-containing copolymerized polyimide composite foams were prepared by combining microwave-assisted foaming with vacuum/ultrasound-assisted impregnation and freeze-drying methods. The fluorinated polyimide foams (F-PIF) featuring “bottom-up” directional growth of pores and uniform impregnation with polyimide aerogels containing fluorine and silicon moieties (FSi-PIA) and nano SiA, exhibited enhanced mechanical and thermal insulation performance as well as hydrophobicity. The relationship and mechanism between copolymerized molecular chain structure, anisotropic pore structure, and properties of composite foams were elucidated. The F-PIF/FSi-PIA/SiA composite foams showed mechanical robustness in the vertical direction (compressive strength improvement of 157.8%) and mechanical flexibility in the horizontal direction (compression response rate up to 97.9%). In addition, the prepared composite foams showed extraordinary hydrothermal aging resistance, thermal stability and thermal mechanical properties, self-extinguishing flame retardancy, and high-temperature thermal insulation with thermal conductivity ranging from 0.0251 to 0.0555 W/(m·K) between 25 and 300 °C. Benefiting from the unique anisotropic pore structure, the impregnation of FSi-PIA as well as nano SiA endowed F-PIF/FSi-PIA/SiA composite foams with a water contact angle as high as 151.1° and water absorption rate as low as 0.31 g/g. Therefore, a facile strategy was proposed to fabricate multifunctional PI composite foams that exhibit promising applications in extreme environments.
研究领域:
材料科学
·
高分子科学
·
热能工程
·
纳米技术
·
化学工程
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产品关联
DOI
PubMed
高影响因子
BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN
·
2022
·Vol. 95
·期 5
·759-767
·
IF 5.121
Cao Pengfei,Zhao Haitao,Adegbite Stephen,Lester Edward,Wu Tao
In this study, a co-precipitation coupled with vacuum-freeze drying (VFD) method was adopted to fabricate a highly mesoporous nickel-aluminium catalyst (VFD-cat). VFD-cat with uniform smaller pore size and a larger BET surface area were obtained than the catalysts prepared following the conventional thermal evaporation drying method (TED-cat). In addition, the VFD method helps to improve the dispersion of precursors, which then enhances the strong metal-support interactions (MSI) of VFD-cat via forming substoichiometric NiAl2O4 spinel. Characterization showed that the average nickel particle size on the VFD-cat was smaller than that of the TED-cat, attributed to the confinement effects of MSI. At 800 °C, the VFD-cat exhibited higher stability during the long-term dry reforming of methane (DRM) test. It was found that the coke formation on spent VFD-cat, especially for the ordered carbon species, was significantly eliminated as compared with TED-cat after the stability test. This strategy offers a facile way to develop DRM catalysts with highly mesoporous and MSI, enhancing the catalytic stability and coke resistance of the nickel-aluminium catalyst.
研究领域:
催化化学
·
材料科学
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DOI
高影响因子
DRYING TECHNOLOGY
·
2023
·
IF 3.3
Mengru Li,Bo Wang,Yuchuan Wang,Jiguang Liu,Min Zhang
The homogeneity of dried products produced via pilot-scale pulse-spouted bed microwave (915 MHz) freeze-drying (pilot-scale PSBMFD) was investigated using sweet corn, potato, banana and hawthorn as experimental materials. The quality and energy cost of the dried products were also investigated. Regarding the moisture content, color difference and shrinkage ratio, pilot-scale PSBMFD achieved high drying uniformity (⩾90%, d.b.). Compared with the conventional freeze-drying (CFD) method used in industries, pilot-scale PSBMFD effectively increased the nutrient retention (d.b.) in dried samples. It increased the retention of flavonoids in sweet corn, potato cube, banana slice and hawthorn by approximately 11.68%, 15.82%, 5.76%, and 15.94% and the total phenolic content by 11.85%, 23.58%, 28.34%, and 24.17%, respectively. Further, pilot-scale PSBMFD resulted in a larger honeycomb porous structure, greater hardness and brittleness as well as shrinkage and lower apparent density than CFD. Regarding the energy cost, pilot-scale PSBMFD can save more energy than CFD (⩾39%, d.b.). This pilot-scale experimental study provides a theoretical basis and technical support for the commercial application of the PSBMFD technology.
研究领域:
食品科学与工程
·
农产品加工
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产品关联
DOI
高影响因子
Foods
·
2024
·Vol. 13
·期 22
·3690
·
IF 4.7
Yue Long,Juan Zhang,Delong Li,Yanpeng Zhang,Yang Cao,Wei Xu,Zhixiong Hu,Chun Hu
β-carotene (BC) has various biological activities, such as anticancer properties, contributing to the prevention of cardiovascular diseases, etc., while the poor solubility and low bioavailability limit its further development in the food industry. Therefore, how to effectively encapsulate this unstable substance has become a hot topic. Here, different concentrations of sodium caseinate and ι-carrageenan (NaCas-CA) complex emulsions were used as wall materials, and the effect of spray-drying (SD) and vacuum freeze-drying (VFD) on the properties of BC powders loaded with NaCas-CA was investigated. The results showed that the characteristic peaks of BC disappeared in all powdered oils, indicating that BC could be effectively encapsulated. As the wall concentration increased, the surface oil of the powders decreased significantly. At the same concentration, the surface oil content of SD (minimum of 8.34%) was lower than that of VFD (minimum of 10.02%). However, the particle size of SD-reconstituted emulsions was larger than that of VFD. Furthermore, the SD-reconstituted emulsions were more stable than the VFD after storage at 25 °C for 3 h. This study reveals the effect of different drying methods on the structure and stability of powdered oils, providing valuable information for the research of functional active-loaded powdered oils and applications in the food industry.
研究领域:
食品科学
·
生物化学
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DOI
PubMed
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2021
·
IF 7.664
Yadong Wu,Zian Wang,Lingyun Xu,Haopeng Wang,Shuqiang Peng,Longhui Zheng,Zhi Yang,Lixin Wu,Jia-Tao Miao
A facile method to prepare silver-plated carbon nanotubes (CNTs)/carbon fiber (CF) hybrid fibers that shows significant mechanical properties enhancement functions was proposed. In this method, abundant CNTs were evenly deposited on the CF surface by freeze-drying deposition and tightly attached to the CF surface by the following sizing process. The Ag@CNTs network on the CF surface significantly enhanced the wettability of the hybrid fibers and increased the interfacial mechanical interlocking between the fiber and matrix, thus significantly enhancing the properties of the CFRP composites. Compared with the untreated CF/EP composites, the interlaminar shear strength (ILSS), flexural strength, impact strength, thermal conductivity, and the electrical conductivity in the thickness direction of the C-CF-Ag@CNTs/EP composites were increased by 54.7%, 62.7%, 107.2%, 37.5% and 385.8%, respectively. Such a simple and effective method of preparing silver-plated CNTs/CF hybrid fibers provides great potential in industrial applications.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 5.6
Zihan Zhang,Guojian Jiang,Yunze Jin,Zhenming Zhao,Dandan Wu,Weidan Ma
RETaO 4 ceramic materials exhibit exceptional properties, including reversible second-order ferroelastic phase transformations, high fracture toughness, and low thermal conductivity, making them ideal for use as new multifunctional thermal barrier coatings (TBCs). In this study, nanoscale (Gd 1/4 Dy 1/4 Y 1/4 Er 1/4 )TaO 4 ((4RE 1/4 )TaO 4 ) ceramic powders were synthesized via the chemical coprecipitation method. The effects of processing parameters such as NH 3 ·H 2 O concentration, drying method, and sintering temperature on the morphology and particle size of the (4RE 1/4 )TaO 4 precursor powder were systematically investigated. The (4RE 1/4 )TaO 4 ceramics were prepared by sintering, and their microstructure, mechanical properties, and thermal conductivity were studied. The (4RE 1/4 )TaO 4 ceramics have lower thermal conductivity (∼1.32 W·m -1 ·K -1 at 1000°C) than YSZ ceramics, attributed to the high-entropy effect resulting from the introduction of multiple rare earth elements. Furthermore, (4RE 1/4 )TaO 4 demonstrates superior thermal barrier coatings materials (TBCs), has a higher thermal expansion coefficient (10.3 × 10 -6 K -1 at 1200°C), lower Young’s modulus (78.4 GPa), and enhanced high-temperature phase stability relative to single rare-earth tantalates. The high-entropy design and nanopowder preparation are conducive to improving the performance of high-entropy ceramics and promoting their promotion and application in thermal barrier coatings.
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DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2019
·
IF 4.784
Yu Chen,Yang Liu,Tao Xing,Boyang Sun,Zhipan Feng,Puwang Li,Ziming Yang,Sidong Li,Shusen Chen
The conventional electrospinning process for the preparation of fibers usually require complex equipment and complicated preparation processes, as well as chemical crosslinkers and organic solvents , which limits its application in the preparation of biomedical materials. In the current study, carboxymethyl cellulose/N-2-hydroxylpropyl trimethyl ammonium chloride chitosan (CMC/HACC) composite fibers were fabricated by polyelectrolyte complexation (PEC) and freeze drying coupled method in both pure water and NaCl solution. The structures of the as-prepared fibers and the effects of NaCl concentration on the structures of fibers were studied by FTIR , solid 13 C NMR, XRD, XPS and SEM. The formation mechanism of the composite fiber and the effects of NaCl concentration on structure and properties of the composite fiber were simulated in the Materials Studio software and discussed. The swelling properties and the thermal decomposition kinetics of the composite fiber were studied. The results suggest that the addition of NaCl electrolyte to the complexing system significantly affects the structure and properties of the PEC fiber. Our work has provided a new preparation route to the composite fibers of natural polymers with controllable structures and properties by the combination of PEC and freeze drying techniques using NaCl with desired concentration as the electrolyte.
研究领域:
材料科学
·
生物医学工程
✓ 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）