FOOD RESEARCH INTERNATIONAL
·
2023
·
IF 8.1
Wanmei Lin,Yifan Zhang,Jihong Huang,Zhonghong Li
A pH-responsive double-layer film comprising chitosan (CS), zein (Z), curcumin-β-cyclodextrin complex (Cur- β-CD), alizarin (AL) and cinnamaldehyde (CIN) was developed to detect spoilage and prolong the shelf life of pork. The outer Z/AL is the colorimetric responsive and highly protective outer layer, while the CS/Cur- β-CD/CIN is the fluorescence responsive and functional layer. The CS/Cur- β-CD/CIN-Z/AL film demonstrated excellent barrier properties against oxygen (8.48 × 10 -13 g (m s Pa) -1 ) and water (2.42 × 10 -11 g (m s Pa) -1 ) primarily due to the polar interactions in the Z structure and its hydrophobic nature. The addition of AL and Cur provided the CS/Cur- β-CD/CIN-Z/AL film with pH colorimetric and fluorescence response capabilities, respectively. Furthermore, the inclusion of Cur- β-CD, CIN and AL significantly enhanced the film’s antioxidant and antibacterial properties, with radical scavenging rates of 79.29 % (DPPH) and 89.84 % (ABTS), as well as antibacterial efficiencies of 96.2 % ( S. aureus ) and 85.78 % ( E. coli ). To test the effectiveness of the double-layer film, a freshness monitoring and maintenance experiment was conducted on pork stored at 4 °C for 8 days. Various parameters of pork, including surface color, pH value, total volatile bases nitrogen (TVB-N), total viable counts (TVC), thiobarbituric acid reactive substance (TBARS), hardness and springiness, were measured, along with the color and fluorescence intensity (FL) of the film. The shelf life of the pork was extended by at least 2 days compared to the control group, and the pork was considered inedible if ΔE ≥ 12 or FL intensity ≤ 2160. Overall, this food packaging film shows promise in simultaneously monitoring and maintaining the freshness of pork.
研究领域:
食品科学
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材料科学
·
生物工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2025
·
IF 5.4
Yi-Heng Wang,Yang Liu,Jin Tong,Shu-Yan Yu
The cyclometalated Ir(III) complex, Ir(ppy) 2 (phen-dipzH 2 ) ( Ir-1 ), was synthesized using the ligand 3,8-di(1H-pyrazol-4-yl)-1,10-phenanthroline (phen-dipzH 2 ) and the auxiliary ligand 2-phenylpyridine (ppy). Crystal structure analysis reveals that each {Ir(ppy) 2 } + unit is coordinated by a neutral phen-dipzH 2 ligand in Ir-1 . The packing arrangement of Ir-1 displays aromatic stacking interactions and [C–H…N] hydrogen bonding interactions between the [Ir(ppy) 2 (phen-dipzH 2 )] + cations. In solution, Ir-1 exhibits emission switching induced by acid/base changes, with the emission wavelength shifting from 562 nm (yellow color) in the neutral state to 618 nm (pink color) under acidic conditions and to 528 nm (gray color) under basic conditions. These shifts are attributed to the protonation and deprotonation of the pyrazole units, which is confirmed by 1 H NMR spectra. Additionally, Ir-1 demonstrates high selectivity and sensitivity toward Cu 2+ ions, with a detection limit as low as 9.47 μM compared to other metal ions. The acid/base-responsive phosphorescence of Ir-1 has also been successfully utilized in the development of paper strip-based devices for urea detection.
研究领域:
化学
·
材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Ying He,Ran Wang,Tifeng Jiao,Xiaoya Yan,Mingli Wang,Lexin Zhang,Zhenhua Bai,Qian Zhang,Qiuming Peng
The useful functionalization and self-assembly of two-dimensional layered materials like hydrotalcite (LDH) are critical for the wide application of nanomaterials. In this work, some self-assembled Langmuir films of ion-exchanged LDH and dyes with different molecular structures were prepared by the Langmuir–Blodgett (LB) technique. The aggregation states of used dye molecules on the surface of the obtained membrane and the structures/properties of the membrane were studied. The hydroxyethyl sulfonate-inserted LDH (LDH-Ise) nanosheets were able to induce the dye formation of highly ordered H- and/or J-aggregate structures. Surface-enhanced Raman scattering (SERS) spectroscopy results demonstrated the uniformity and repeatability of the film. Interestingly, the good acid–base gas response characteristics of present LDH-Ise/dye LB films were investigated by UV–vis and Fourier transform infrared (FT-IR). The present research work provides new clues for the development of gas sensors and chemical switches as well as the preparation of effective functional self-assembled films.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2017
·Vol. 19
·期 9
·1294-1303
·
IF 3.474
Wenyan Fang,Yuyang Zhang,Gaobin Zhang,Lin Kong,Longmei Yang,Jiaxiang Yang
A highly fluorescent emissive difluoroboron complex (TC) was designed, synthesized and characterized. The absolute fluorescence quantum yields of TC are 33.0% in the solid state and 26.0% in the solution state. The results of X-ray diffraction analysis demonstrate that the rigid structure, the intermolecular hydrogen bonding and the well-ordered as well as loose molecular packing are the major reasons for the high fluorescence emission. Moreover, the colors and fluorescence emission of TC can be switched by external stimuli including grinding and acids/bases. Powder X-ray diffraction (PXRD) investigation verifies that the crystalline–amorphous state transformation between the original and ground states might be attributed to the mechanochromic luminescence properties. The high fluorescence emission and multi-stimuli-responsive fluorescence properties reveal that TC can be used as rewritable information storage, security ink and a fluorescence indicator for acids/bases.
研究领域:
化学
·
材料科学
✓ 已验证
DOI
高影响因子
Chemistry-An Asian Journal
·
2018
·Vol. 13
·期 9
·1206-1212
·
IF 3.692
Xiaojun Wang,Chang Gu,Hongzhi Zheng,Yu-Mo Zhang,Sean Xiao-An Zhang
A multi-state and multi-stimuli-responsive oxazine molecular switch that combines an electro-base property and sensitive base/acid-responsive properties was designed and synthesized. The multi-state structures of the molecular switch, with different colors, were predicted by comparing the optical properties with reference molecules and confirmed by using NMR spectroscopy. The color-switching mechanism under stimulation with acids and bases was investigated by using DFT calculations. Three single states can be obtained and the switching is unidirectional under acid and base stimulation. The electrochromic phenomenon of the molecular switch, which combines its electro-base and base-sensitive properties, was demonstrated. An electrochromic device that exhibited good electrochromic properties with excellent reversibility (2000 cycles) and high coloration efficiency (804 cm 2 C −1 ) was successfully constructed.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-10
·
IF 15.7
Ji Ming-Jun,Zhao Wen-Long,Li Meng,Chen Chuan-Feng
Circularly polarized luminescence (CPL) in solution offers several advantages. However, it remains challenging for organic molecules to achieve circularly polarized luminescence with high dissymmetry factor ( g lum ) in solution. Herein, a general strategy is developed by placing chiral nematic liquid crystals (N*-LCs) behind the solution of achiral organic molecules. The selective reflection-transmission mechanism of solution-N*-LC composite system enables the generation of full-color and white circularly polarized light with | g lum | even reaching 2.0. This strategy demonstrates versatility, being applicable to both aqueous and organic solutions, and effectively achieving the circularly polarized luminescence of multiple molecules with high g lum values. Additionally, CPL switching and logic gate applications are successfully realized by leveraging the selective reflection-transmission mechanism of N*-LCs and the reversible acid-base responsiveness of the solution systems. This work provides a general and robust strategy for achiral organic molecules to achieve circularly polarized luminescence with high | g lum | values in solutions.
研究领域:
材料科学
·
光学
·
有机化学
✓ 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）