Food Chemistry-X
·
2024
·
IF 6.5
Jin-Ru Wang,Xin-Ye Wu,Cheng-Bi Cui,Jin-Feng Bi
Hot air drying (HD), vacuum freeze drying (FD), and pilot-scale freeze drying (PSFD) are extensively used to prepare peach slices. However, the aroma of hot air drying and vacuum freeze-drying is yet to be addressed. In this study, HS-SPME-GC–MS was used to characterize and quantify the volatile compounds in peach slices. First, 33, 36, and 46 volatile compounds were identified and quantified in the HD, FD, and PSFD groups, respectively. PSFD is preferable to HD and FD in terms of the volatile compound types, content, and aroma profiles. PSFD was selected for subsequent permeation and dehydration experiments. The key aroma compounds with an OAV ≥ 1 were found in the PSFD30 group. GC-O analysis was conducted on the PSFD30 group, leading to the preliminary identification of 2-methylbutanal, pentanal, hexanal, 2-hexenal, phenylacetaldehyde, ethyl acetate, 2-methylbutyl acetate, ethyl lactate, linalool, methyl heptenone, and γ-octalactone as distinctive aromas in dried peach slices.
研究领域:
食品科学
·
农业工程
·
化学分析
✓ 已验证
DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2024
·
IF 4.3
Yuyue Yan,Liyuan Liu,Guanhua Ren,Xueqian Zhang,Chunmei Ouyang,Hongwei Zhao,Jiaguang Han
The co-solvent system of tert -butanol and water is commonly employed in the field of freeze-drying pharmaceuticals. Investigating the phase composition and behavior of this system at low temperatures contributes to furthering its applications. In this study, THz-TDS was used to investigate the melting process of the frozen tert -butanol-water binary system for the first time. Utilizing the THz fingerprint peaks, we discovered that following the initial freezing, the system only formed metastable dihydrate tert -butanol, but near the melting point, it transformed into stable heptahydrate tert -butanol. This transition did not occur at high tert -butanol contents. Combining DFT calculations, all observed absorption peaks were attributed to the low-frequency vibration modes of each crystal. A phase diagram of the tert -butanol-water binary system was constructed based on the difference in absorbance intensity between the solid and liquid phases. The results demonstrate the potential of THz spectroscopy for applications in pharmaceutical freeze-drying.
研究领域:
药学
·
物理化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF STORED PRODUCTS RESEARCH
·
2025
·
IF 2.8
Xiangfei Li,Menghan Wang,Meng Ding,Xinyi Pang,Jing Sun,Yingjian Lu
Freeze-drying is a common method for preserving bacteria cells, but it can cause cell damage in the process of protection. Therefore, it is necessary to explore a cryoprotectant to improve cell survival during the process. This research aimed to explore the optimal cryoprotectant formulation of L. acidophilus FMNS-10 and its protection mechanism. The optimal cryoprotectant consisted of 10.7 % skim milk, 3 % sodium L-glutamate and 10 % D-trehalose, resulting in a survival rate of 91.69 % for L. acidophilus FMNS-10 after freeze-drying ( p < 0.05). Under this condition, the integrity of cell wall and membrane of L. acidophilus FMNS-10 was close to that of the fresh strain, which could be attributed to preventing ice crystal formation. Cryoprotectants demonstrated a significant protective effect on enzymatic activities. In the cryoprotectant-free group, the activities of β-galactosidase, L-LDH, Na + /K + -ATPase and the concentration of Ca 2+ decreased by 36.19 %, 51.82 %, 89.40 %, and 41.90 %, respectively. However, the cryoprotectant group were only 7.10 %, 1.66 %, 7.41 %, and 4.10 % reductions compared to the cryoprotectant-free group ( p < 0.05). These results indicated that the optimal cryoprotectant improved the survival rate of L. acidophilus FMNS- 10 by inhibiting the loss of enzyme activity. In addition, the optimal cryoprotectant significantly mitigated the DNA damage induced by freeze-drying. The reduction in enzyme and DNA damage may be attributed to complex cryoprotectants maintaining the stability of their three-dimensional structures and reducing structural disruption caused by freezing. Further analysis of storage stability revealed that the viable count of L. acidophilus FMNS-10 exceeded 10 7 CFU/mL when stored at −20 °C for 180 days. These findings provide a comprehensive theoretical foundation for how to freeze-dry Lactobacillus acidophilus.
研究领域:
微生物学
·
食品科学
✓ 已验证
产品关联
DOI
高影响因子
FOOD RESEARCH INTERNATIONAL
·
2021
·
IF 6.475
Xin Ying,Jiaxing Gao,Jing Lu,Changlu Ma,Jiaping Lv,Benu Adhikari,Bo Wang
Soy peptide solution (40%, w/w) was successfully encapsulated in a W 1 /O/W 2 double emulsion produced by a two-step emulsification process. Polyglycerol polyricinoleate (PGPR) was found to be an effective inner emulsifier compared to Span 60 and lecithin to produce stable W 1 /O primary emulsion. The primary emulsion was subsequently emulsified into an outer aqueous phase (W 2 ) containing octenyl succinic anhydride (OSA) starch and maltodextrin. The droplet size and encapsulation efficiency of the peptide solution in W 1 /O/W 2 emulsion were found to depend on the W 1 :O ratio, peptide concentration in the inner W 1 phase and homogenization condition of the secondary emulsification step. The double emulsion with the highest encapsulation efficiency (>80%) was prepared by: (i) using 40% (w/w) soy peptide solution as W 1 phase; (ii) controlling W 1 :O ratio at 3:7 (w/w) and (iii) homogenizing the emulsion at 10,000 rpm for 3 min. The freeze-dried microcapsule powder of W 1 /O/W 2 emulsion showed higher encapsulation efficiency (>70%) compared to spray-dried one. The freeze-dried microcapsule of W 1 /O/W 2 double emulsion developed in this study is a promising delivery matrix to encapsulate hydrophilic ingredients including peptides. Fourier-transform infrared spectroscopy (FTIR) spectra of the microcapsule powder indicated good compatibility between peptide and encapsulants.
研究领域:
食品科学
·
生物技术
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Youchuan Ma,Jinfeng Bi,Zhonghua Wu,Jianyong Yi
Saccharides are the dominant factor shaping the texture of freeze-dried products. This study investigated the impact of various molecular-weight saccharides at different concentrations on the physical properties and intermolecular interactions of pectin-CMC cryogels by experiment and molecular dynamic (MD) simulations. Results showed that the increased shrinkage of cryogels and enhanced molecular interactions between saccharides and pectin-CMC were mechanisms that enhanced the hardness of cryogels. Notably, the cryogel with fructose exhibited significantly higher hardness compared to cryogels with other saccharides. The cryogel containing 16 % fructose had the lowest glass transition temperature ( T g ), leading to the highest shrinkage (70 %). Moreover, the MD results revealed that fructose had the highest intermolecular interaction energy (coulombic short range) with pectin-CMC (−5316.78 kJ/mol). This study revealed that the intermolecular interactions between the added saccharide and the pectin-CMC, in addition to the density of the cryogel, are critical determinants of the hardness and crispness of cryogels.
研究领域:
食品科学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Ling Li,Qinggang Li,Juan Hong,Mengyong Sun,Jie Zhang,Shaoming Dong
Porous Si 3 N 4 ceramics with uniform pore distributions were fabricated by freeze drying with liquid N 2 as refrigerant, and then sintered at 1700 °C under an N 2 pressure of 0.3 MPa. The Si 3 N 4 dispersant slurries were prepared by ball milling for 12 h and casting into a mold using liquid nitrogen as a freezing medium with the top surface of the sample exposed to air at room temperature. The temperature gradient contributed to bimodal peaks of pore size distribution . Effects of solid concentration on the porosity, mechanical, and dielectric properties of the Si 3 N 4 sample were systematically investigated. As the solid content increased from 15 vol.% to 40 vol.%, the porosity decreased from 83.9% to 40.58%. Therefore, flexural strength and compressive strength increased from 0.1 MPa to 94.7 MPa, and 1.3 MPa–314 MPa, respectively. Moreover, the dielectric constant increased from 1.4 to 4.0. This study indicated that the freeze-drying process is a useful method for fabricating novel porous Si 3 N 4 ceramics with unidirectional channels.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
Russian Journal of Physical Chemistry A
·
2021
·Vol. 95
·期 11
·2287-2289
·
IF 0.691
Wang Hongyu,He Liang,Wang Hao,Liu Mingkun,Wang Tianyi
Abstract Palladium nanoparticles were prepared via solvothermal method using Na 2 PdCl 4 , AgNO 3 , and oleylamine. By choosing the optimal reaction time and reaction temperature, palladium nanoparticles with regular morphology and size within 10 nm were prepared. A vacuum freeze drying was applied to prevent aggregation of nanoparticles.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
Polymers
·
2025
·Vol. 17
·期 13
·1874
·
IF 4.9
Ruting Luo,Yujie Mu,Le Zhao,Jinglin Hua,Lixin Cao,Danting Chen,Kun Li,Zhenkai Jin,Yanchuan Guo,Bing Zhang,Min Wang
Skin is the first line of defence between the human body and the outside world, and it is constantly exposed to external injuries and wounds for a variety of reasons. Collagen is a structural protein of the extracellular matrix and an important component of the dermis. As a wound dressing, collagen not only provides nutrients to wounds but also enhances the immune response in the pre-healing phase, making it an excellent biomaterial for healing. In this study, we used electrospinning and freeze-drying technology to prepare a Bovine Achilles Tendon Collagen (BATC) electrospun composite membrane and a BATC freeze-dried composite membrane using BATC as a substrate supplemented with 16.7% Polyethylene oxide (PEO) and 0.2% Kukoamine B (KuB). The physicochemical properties and biocompatibility of the BATC composite membrane were verified via scanning electron microscopy, Fourier-transform infrared spectroscopy, and DSC analysis and by measuring the DPPH radical-scavenging capacity, water absorption, water retention, in vitro drug release, and extract cytotoxicity. The BATC composite membrane was found to have a significant effect on skin wound healing, especially in the middle stage of healing, in a mouse full-thickness skin injury model. The BATC/PEO/KuB electrospun composite membrane (EBPK) had the best capacity for promoting wound healing and can be used as a wound dressing for in-depth research and development, and KuB, a monomer component with a clear structure and mechanism of action, can be used as a candidate component of composite dressings.
研究领域:
生物材料
·
创伤修复
·
药理学
·
组织工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Foods
·
2024
·Vol. 13
·期 14
·2206
·
IF 4.7
Lixia Xie,Jiajia Liu,Haoyu Wu,Yueyan Zhong,Xueying Liu,Guangli Li,Zhi Liu
The present study aimed to investigate the variations in the nutritional composition, antioxidant capacity, and metabolite profile of lilies subjected to different drying treatments, including vacuum freeze drying (VFD), hot air drying (HAD), vacuum drying (VD), and infrared drying (ID). The results show that VFD provided better preservation of the original coloration and displayed the highest levels of total amino acid content, total phenolic content, total flavonoid content, and polysaccharide and alkaloid content. Our results reveal that VFD treatment can be employed to obtain high-quality lilies with desirable appearance characteristics and nutrient compositions. Metabolomics analysis identified a total of 464 metabolites from various dried lilies. Differential metabolite screening found 150 differential metabolites across all pairwise comparisons. Hierarchical clustering analysis (HCA) indicated that lilies subjected to VFD treatment exhibited a higher abundance of steroids, saponin, flavonoids, and phenolic glycoside, whereas those subjected to HAD, VD, or ID treatments showed relatively elevated levels of specific amino acids or derivatives. This study elucidates the significant impact of various drying treatments on the quality and metabolic profile of lilies, thereby providing valuable insights for enhancing the nutritional quality of processed lilies.
研究领域:
植物学
·
食品科学
·
营养学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SOFT MATERIALS
·
2021
·
IF 2.429
Dongxu Pei,Bing Lv,Jianhua Wang,Shengli Qi,Guofeng Tian,Dezhen Wu
In order to better understand the influences of polyimide (PI) skeleton structure and freeze-drying process on the properties of PI aerogel materials, PI molecular chains (ODPA-ODA, BPDA-ODA, BPDA-PPDA) with different stiffnesses and flexibilities were designed and a series of PI aerogels were accordingly fabricated by freeze-drying technique. The aerogels produced featured light weight (density of 0.01–0.16 g/cm3) and high flexibility, and their density, pore structure, and compress recovery performance could be well controlled by delicately tuning the molecular chain structure and solid contents of the poly (amic acid) salt solution. In addition, a hard PI aerogel with enhanced compressive strength was obtained by quick-freezing in liquid nitrogen.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Foods
·
2022
·Vol. 11
·期 12
·1809
·
IF 5.561
Zhi-Hong Zhang,Bangjie Yu,Qili Xu,Zhenyu Bai,Kai Ji,Xianli Gao,Bo Wang,Rana Muhammad Aadil,Haile Ma,Rensong Xiao
Spirulina (Artrhospira platensis) is rich in chlorophylls (CH) and is used as a potential natural additive in the food industry. In this study, the CH content was extracted from spirulina powder after ultrasound treatment. Microcapsules were then prepared at different ratios of gum Arabic (GA) and whey protein isolate (WPI) through freeze-drying to improve the chemical stability of CH. As a result,a*andC*values of the microcapsules prepared from GA:WPI ratios (3:7) were −8.94 ± 0.05 and 15.44 ± 0.08, respectively. The GA fraction increased from 1 to 9, and encapsulation efficiency (EE) of microcapsules also increased by 9.62%. Moreover, the absorption peaks of CH at 2927 and 1626 cm−1in microcapsules emerged as a redshift detected by FT-IR. From SEM images, the morphology of microcapsules changed from broken glassy to irregular porous flake-like structures when the GA ratio increased. In addition, the coated microcapsules (GA:WPI = 3:7) showed the highest DPPH free radical scavenging activity (SADPPH) (56.38 ± 0.19) due to low moisture content and better chemical stability through thermogravimetric analysis (TGA). Conclusively, GA and WPI coacervates as the wall material may improve the stability of CH extracted from spirulina.Keywords:spirulina;microencapsulation;freeze-drying;physicochemical properties;antioxidant activity
研究领域:
食品科学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
·
2023
·
IF 6
Lianfeng Luo,Jieqiong Wang,Meiqin Li,Yingbin Zhang,Yuwan Wang,Yongquan Xu,Haisheng Chen,Yan Zhu,Zhihui Feng,Junfeng Yin
With a distinctive aroma, Shanhuangpi (SHP), the fruit of the plant Clausena anisum-olens (Blanco) Merr., has been newly developed as a commercial fruit resource. The fresh fruit deteriorates rapidly due to its high respiration and metabolism. Therefore, an effective drying process is urgently needed for its preservation. The influence of two commonly used drying methods for plant materials, i.e., vacuum freeze-drying (VFD) and hot air drying (HAD) was evaluated on the aroma, taste, color, and volatile profiles of this fruit. The results indicated that the VFD process well retained the color and volatile composition of the fresh fruit but produced extra graininess and sticky mouthfeel. Alternatively, the HAD process offered a shorter drying time, kept a more palatable sour/sweet ratio, but created a darker brown color and shrinking texture of the fruit. The volatile components were enriched by the micro-chamber/thermal extractor (μ-CTE) and 38 compounds were identified with gas chromatography-mass spectrometry. Sixteen odor-active compounds (detection frequency ≥4) were detected by gas chromatography–olfactometry. Results obtained in this study can be served as a reference for the evaluation and further development of SHP.
研究领域:
食品科学
·
植物学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）