INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2016
·
IF 3.138
Jie Zhu,Lin Li,Shuyan Zhang,Xiaoxi Li,Binjia Zhang
This work revealed the influence of thermal processing on the microstructural, mesoscopic and molecular scale structures and thus the plasticizer migration of the starch ester films. Thermal processing promoted the permeation of water molecules to hinder the shrink of the amorphous macromolecules. That is, the swelling of the amorphous macromolecules diminished the ordered regions to a certain degree, resulting in the enlarged amorphous regions. Along with slight degradation of the macromolecules, the crystallites were partially disorganized, as indicated by a reduced relative crystallinity. These multi-scale structural changes of the films and the thermally enhanced mobility of plasticizer molecules synergistically enhanced the plasticizer migration. This study not only enables a well understanding of how thermal treatment alters the plasticizer migration of starch-based films from a multi-scale structural view, but also hints to our future work that rationally modulating the structural features of starch-based film may effectively control the migration of chemicals.
研究领域:
食品科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Innovative Food Science & Emerging Technologies
·
2021
·
IF 5.916
Xiangxiang Sun,Zhuangzhuang Sun,Yu Guo,Jiangyan Zhao,Jian Zhao,Xiangzhen Ge,Huishan Shen,Qian Zhang,Wenjie Yan
The influence of twin-screw extrusion (TSE), cold plasma (CP, 1, 5, and 9 min), and their combination (TSE-CP) treatment on the structural, physicochemical, rheological, solubility, and in vitro digestive properties of potato starches were studied. The results showed that CP slightly changed the starch granules morphology, maintained the growth ring and crystalline structure, promoted depolymerization of the amylopectin branch chain, and increased crystallinity and the ΔH value. It is worth noting that the resistant starch content increased from 84.80 to 86.46% in the short time CP modified potato starch. Meanwhile, TSE and TSE-CP treatments influenced surface morphology, growth ring of potato starch significantly. However, the dually modified potato starch using combined TSE and CP treatments promoted depolymerization of longer chains, increased the proportion of shorter chains and solubility, and improved the degree of hydrolysis . Furthermore, the single and dual treatments did not change the FT-IR spectra pattern. This study suggests that the combination between TSE and CP had more profound modification than the single treatment. The TSE combined with CP is an eco-friendly, thermal, and non-thermal combination technology, which can improve the multi-scale structure of starch and enhance physicochemical properties. Also, the dual treatment can be used to produce modified starch for industrial applications.
研究领域:
食品科学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
FOOD HYDROCOLLOIDS
·
2021
·
IF 9.147
Mei Li,Jing Wang,Fenfen Wang,Ming Wu,Rui Wang,Padraig Strappe,Chris Blanchard,Zhongkai Zhou
The effect of acylation with various short-chain fatty acids on starch fine structure, digestion and gut microbiota fermentation property was investigated. Nuclear magnetic resonance spectra of acylated starch convinced the existence of acyl protons. Consistently, Fourier transform infrared spectra showed a carbonyl C O vibration at 1730 cm −1 due to the introduced acyl groups. X-ray diffraction (XRD) and small angle X-ray scattering (SAXS) studies revealed that the acylation destroyed the internal structure for providing a chance of rearrangement of starch molecules with the formation of a different fractal structures. More interestingly, compared with native starch, there were a higher Δρu and a lower Δρ for acylated starches, suggesting more ordered aggregation structures was formed inside the starch granules. Kinetics of in-vitro hydrolytic enzymatic model and Pearson correlation coefficients further confirmed the association between multi-scale structural order and digestion characters. Acyl groups introduced by acetylation, propionylation and butyrylation onto the starch molecules could be effectively released by the intestinal flora during the fermentation, specifically increasing their corresponding SCFAs production, respectively. The greater generation of the specific SCFA from the acylated starches following the microbiota fermentation may highlight their importance in the application in food and pharmaceutical industry.
研究领域:
食品科学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2021
·
IF 5.645
Huimin Zhang,Guangrui Zhang,Hanqi Zhu,Fumei Wang,Guangbiao Xu,Hua Shen,Jilong Wang
An efficient and economic kapok/cellulose aerogel for waste oil treatment was successfully fabricated via simple freeze-drying and surface modification. To investigate their oil absorption performance, various aerogels by multi-scale cellulose and different lengths of kapok fibers were characterized. The use of cellulose nanofibers (CNF) enabled aerogels to possess remarkably uniform pore size and structural integrity, while the introduction of kapok improved their mechanical property, oil absorption and retention performance. For kapok/microfibrillated cellulose (MFC) aerogels, an excessively enlarged porous structure caused by long fibers would damage the structural stability of aerogels and reduce their oil absorption capability. Compared with the sheet-like structure formed by self-aggregated MFC, filamentous CNF exhibited better entanglement characteristics and possessed a more positive impact on enhancing the structural integrity and mechanical properties of aerogels. These aerogels presented ultra-low density (4.9 mg/cm 3 ), desirable hydrophobicity (147.6°), outstanding oil absorption (141.9 g/g) and retention (97.7 %) capacity, and excellent selective sorption property, making them ideal absorbents for oil spill cleaning.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
·
2021
·
IF 4.952
Xiangxiang Sun,Ahmed S.M. Saleh,Zhuangzhuang Sun,Xiangzhen Ge,Huishan Shen,Qian Zhang,Xiuzhu Yu,Li Yuan,Wenhao Li
The effects of microwave (MW) treatments for 30 and 90 s or cold plasma (CP) treatments for 2, 6, and 10 min on structural, physicochemical, and digestive properties of rice starch were investigated and compared with the effects of combined MW and CP treatments. Dual modification of starch using combined MW and CP treatments significantly changed starch granules' morphology, and starch showed lower crystallinity, swelling power, and peak viscosity than rice starch with a single modification. However, no significant changes were found in rice starch's crystalline structure and FT-IR spectra pattern after single or combined treatments. Effects of these treatments on the amylopectin branch chain length distribution and molecular weight of rice starch varied considerably depending on treatment type and treatment duration. Moreover, the dually modified rice starch contained more great content of resistant starch. Thus, the synergistic effects between MW and CP had more profound modification than the single treatment. Also, the dual treatment can be used to produce modified starch for industrial applications.
研究领域:
食品科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Changyue Deng,Tiantian Zhang,Xiumei Zhang,Tingting Gu,Li Xu,Zhenyu Yu,Mingming Zheng,Yibin Zhou
Alcohol solution is a cheap, simple, and effective precipitating solvent frequently used for separating debranched starch (DBS), yet little is known about the precipitation mechanism of DBS by different alcohols. This study precipitated DBS from pullulanase-hydrolyzed starch using ethanol, n-butanol, and isopentanol. The multiscale structures of DBS were characterized, including chain length, single/double helix, and crystalline. The chain conformation and precipitation mechanism of DBS in different alcohols was investigated using molecular dynamics (MD) simulation. DBS precipitated by n-butanol contained the largest proportion of short chain (DP6–24, 83.2 %), the highest V-type crystallinity (21.1 %), and the largest single-helix content (24.7 %). A single helix conformation of DBS chain was determined in alcohols, where alcohol molecules entered the helix cavity. Intra/inter-molecular hydrogen bonds stabilized the helix, with a large number of hydrogen bonds leading to strong molecular interaction and stable helical structure. The solvent accessible surface area of DBS chain decreased by 7.88–19.32 % in alcohols, and the radial distribution function revealed that the first solvent layer of DBS chain at 0.29 nm was closely related to hydrogen bonding. This study provides a basis for the choice of precipitation solvent for preparing DBS with different chain lengths and physicochemical properties.
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
Soft Matter
·
2019
·Vol. 15
·期 46
·9500-9506
·
IF 3.399
Lingqi Zhong,Xiao Gong
Superhydrophobic films that are simple, inexpensive, corrosion-resistant and multifunctional are in high demand for industrial applications. We propose a simple and economical phase separation method for fabricating superhydrophobic films using polylactic acid (PLA), nano-SiO2 and a mixture of good and poor solvents to construct a rough surface with a nano/microstructured morphology. The phase separation-induced superhydrophobic PLA/SiO2 composite film with a porous network structure has a water contact angle greater than 164°. This method can be applied to a variety of surfaces or used in large-scale industrial production. The fabricated superhydrophobic films may be applied in biological fields because PLA is a good biodegradable material.
研究领域:
材料科学
·
生物学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Shanshan Gao,Shuang Liu,Rui Zhang,Si Zhang,Jianfei Pei,Hang Liu
The effects of plasma treatment on multi-scale structures and in vitro digestibility of starches isolated from Tartary buckwheat (TBS), potato (PTS), and pea (PS), were investigated. The results from SEM and CLSM showed that plasma treatment resulted in the extension of pores from the starch hilum to the surface. The XRD and 13 C CP/MAS NMR spectra demonstrated that the crystalline type of three starches was not changed by plasma treatment, while the RC and double helix content of TBS increased. Besides, the single helix content and the proportion of amorphous phase decreased following the treatment, which was consistent with the result of SAXS. However, the PTS and PS showed the opposite results by plasma treatment. In addition, the modification significantly changed the molecular weight (Mw) and chain length distribution of all the starches, among which the Mw of PTS fell drastically from 2.45 × 10 7 g/mol to 1.74 × 10 7 g/mol. The in vitro digestibility of starches increased significantly when treated with plasma, in which TBS exhibited the biggest increase for its inside-out and side-by-side digestion manners. Therefore, plasma treatment led to different alteration trends for multi-scale structures with quite various change extent for in vitro digestibility about different crystalline starches.
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
CARBOHYDRATE POLYMERS
·
2016
·
IF 4.219
Siyuan Liu,Panfu Cai,Xiaoxi Li,Ling Chen,Lin Li,Bing Li
To improve the water vapor resistance of starch-based films, Na-MMT (Na-montmorillonite) as nanofillers were fabricated into hydroxypropyl starch and the multi-scale structural changes (including intermolecular interaction, short-range conformation, long-range ordered structure and the aggregated structure of the film) were revealed. The elongation of the water vapor molecule pathway by tortuous path is generally recognized as the main reason for the improvement of water resistance. However this study observed the lowest water vapor permeability (WVP) was at the 3% Na-MMT/hydroxypropyl starch (HPS) ratio instead of 5% even nanofillers were partially exfoliated at both ratio. Except for the “tortuous path” caused by nanofillers, this observation proposed that the short-range conformation of HPS chains, long-range ordered structure and the aggregated structure likely influenced the water barrier property. The relationship between WVP and multi-scale structure of the film was investigated. The results suggested that a good balance of short-range conformationin the amorphous region, long-range ordered structure and the aggregated structure of the film was required for the improvement of water vapor barrier property.
研究领域:
材料科学
·
食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LANGMUIR
·
2018
·
IF 3.789
Ning Xue,Jian Yao,Caihong Shi,Xinrui Wang,Wenying Shi,Chao Lu
The nanoplatelet-filled polymer composite (NFPC) materials have received increasing attention because of their high strength-to-weight ratio and toughness. However, high-performance NFPC materials still face many challenges: (1) how to transfer the intrinsic extraordinary performance of individual nanoplatelets into highly ordered macroscale bulk materials; (2) how to obtain a strong interface bonding between polymer and nanoplatelet filler; and (3) how to truly reflect the structure of NFPC film. Here, to address these problems, the flow-induced assembly method is employed to fabricate the large-size continuous, flexible, highly oriented, and transparent NFPC film. During flow-induced orientation, nanoplatelet and polymer can be coassembling together to form a highly ordered layered structure with dozens of layers. On the other hand, the layered double hydroxide (LDH) nanosheet filler with single layer and abundant hydroxyl sites is prepared to strengthen interface by forming hydrogen bonds with polymers. To explore the effect of multiscale structure on property, carbon dots (CDs) are introduced to light up the inorganic nanoplatelet. By fixing and confining CDs in a rigid environment, the CD-LDH-based composite film shows excellent dual emission characteristics, which can be used to evaluate gas barrier, humidity, and temperature with direct visualization, high sensitivity, and easy to operation.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Mingqi Ding,Wenjie Ma,Pengju Liu,Jingbo Yang,Keyu Lan,Dawei Xu
Aerogel with vertically aligned porous structure can effectively enhance sunlight absorption and continuously absorb seawater, which is ideal for solar-thermal desalination, but the oriented cell walls lead to rapid heat dissipation, reducing the evaporation efficiency. Herein, the multifunctional aerogels with enhanced thermal insulation property were fabricated through rational assembly of exfoliated Ti 3 C 2 T x nanosheets, polyvinyl alcohol (PVA) and cellulose nanofibrils (CNF). The MXene composite aerogel (MCA) possessed the multiscale structure with parallel PVA/Ti 3 C 2 T x cell walls served as the skeleton and cross-linked CNF filled in the aligned pores, which is responsible for the superior hydrophilicity, thermal insulation (56.54 mWm - 1 K - 1 ) and solar absorption (97.9 %), suggesting high solar-thermal evaporation efficiency. Consequently, under exposure to 10 h natural sunlight irradiation, the maximum evaporation rate and efficiency of MCA reached 1.13 kgm - 2 h - 1 and 82.93 %, respectively. Moreover, the swelling of polymers with dipped water causes the structure change and conductivity variation of MCA, which can monitor the changing humidity by the generation of water-induced electrical signal, showing great prospects in solar-thermal desalination and intelligent detection fields.
研究领域:
材料科学
·
能源工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2024
·
IF 10.5
Heng Pan,Shuyi Qing,Pei Lyu,Jie Ren,Qi Ran,Jun Hou,Zilong Wang,Liangjun Xia,Xiaofang Zhang,Xin Liu,Weilin Xu
Developing electromagnetic interference (EMI) shielding materials with combinations of lightweight, multi-functions, and robust performance under harsh conditions, is urgent towards their practical application for portable electronic devices, while it still faces extreme challenges. In this work, porous carbon fibers (PCFs) featuring the interconnected nano-scaled pores on the surface and the internal micron-sized pores, were prepared and stacked into multi-layer carbon films, that further introduce the in-of-plane porous network and out-of-plane interlayer space. Such multi-scaled porous structure brings beneficial effects to carbon films including low density, consecutively conductive pathway, and outstanding capability to absorb electromagnetic waves. The produced carbon films exhibit remarkable electromagnetic interference shielding efficiency, achieving an attenuation level of up to 90 dB in the X band, even with a low material density of only 0.19 g/cm³. Furthermore, the stacked carbon films are structurally stable and robust, capable of delivering high EMI shielding performance under extreme environments, like acid/basic treatments, high (250 °C) or extremely cryogenic (−196 °C) temperatures and hygrothermal environments. Additionally, as-fabricated multi-layer carbon films demonstrate outstanding adsorption capacity for organic solvents and charge storage capacity. This work paves the way for multifunctional EMI materials construction in an economical and efficient manner.
研究领域:
材料科学
·
电子工程
✓ 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）