Effect of microstructure-scale features on lignin fluorescence for preparation of high fluorescence efficiency lignin-based nanomaterials

Shen, Qi; Xue, Yuyuan; Zhang, Yan; Li, Tianjin; Yang, T.-C.; Li, Shengren

doi:10.1016/j.ijbiomac.2022.01.095

Cited by 14 publications

(3 citation statements)

References 46 publications

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“…[22] Therefore, the fluorescence enhancement can reflect the degree of degradation of the lignin coating. 43 As shown in Figure 7A, the lignin fluorescence was not detected in pure water, indicating that Only UV irradiation was difficult to effectively separate lignin from the surface of AgNPs, which was consistent with the results of UV-vis and ICP. With the water volume decreased to 40 %, the emission peak was blue-shifted from 411 nm to 360 nm, and the fluorescence intensity persistently increased.…”

Section: Reaction Mechanism Analysessupporting

confidence: 85%

UV‐Induced Oxidation Preparation of Multi‐Functional Lignin‐Based AgNPs and its Application for Conductive Coating, Antibacterial Enhancement, and Product Separation

Yang,

Li,

Xue

2024

ChemistrySelect

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This study presents a novel approach for regulating the properties of lignin‐based silver nanoparticles (AgNPs), which was UV‐induced Tetrahydrofuran (THF) to form peroxide for the etching of these nanoparticles. The lignin coating was first degraded by oxidation, and the properties of the exposed AgNPs changed under etching. Notably, water can greatly regulate the oxidation capacity of the THF medium, thereby controlling the degradation degree of lignin coating and obtaining dissolution, aggregation, precipitation, and color‐variable phenomena of AgNPs under the synergistic effect of UV irradiation and peroxide etching. By adjusting UV irradiation time, various functional products of silver nanowires (AgNWs), color‐variable AgNPs, lignin‐based AgNPs aggregates, and composite solution of Ag particles and Ag+ were obtained. The transformation of these product properties is closely related to the oxidation capacity of H2O/THF medium. In addition, Multi‐functional Lignin‐based AgNPs show excellent application potential in conductive coating, antibacterial enhancement, and product separation, providing a promising avenue for the targeted utilization of lignin‐based AgNPs.

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Section: Reaction Mechanism Analysessupporting

confidence: 85%

UV‐Induced Oxidation Preparation of Multi‐Functional Lignin‐Based AgNPs and its Application for Conductive Coating, Antibacterial Enhancement, and Product Separation

Yang,

Li,

Xue

2024

ChemistrySelect

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“…The comparison of LFNP samples prepared with different raw material ratios showed that the sizes of LFNP-1 and LFNP-2 still had smaller particle sizes dispersed, while the nanoparticle sizes of LFNP-3 were uniformly distributed in the range of 250-350 nm, with the most regular morphology. These results proved that the reaction between lignin and citric acid resulted to changes in the surface morphology and internal structure of the original lignin nanoparticles, thus manifesting the increase to larger diameter spherical nanoparticles, and this phenomenon was also related to a cross-linking reaction [35].…”

Section: Morphology and Structurementioning

confidence: 62%

One-Step to Prepare Lignin Based Fluorescent Nanoparticles with Excellent Radical Scavenging Activity

Zhang,

Abushammala,

Puglia

et al. 2024

JRM

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Fluorescent nanomaterials have attracted much attention, due to their unique luminescent properties and promising applications in biomedical areas. In this study, lignin based fluorescent nanoparticles (LFNP) with high yield (up to 32.4%) were prepared from lignin nanoparticles (LNP) by one-pot hydrothermal method with ethylenediamine (EDA) and citric acid. Morphology and chemical structure of LFNP were investigated by SEM, FT-IR, and zeta potential, and it was found that the structure of LFNP changed with the increase of citric acid addition. LFNP showed the highest fluorescence intensity under UV excitation at wavelengths of 375-385 nm, with emission wavelengths between 454-465 nm, and exhibited strong photoluminescence behavior. Meanwhile, with the increase of citric acid content, the energy gap (ΔE) gradually decreased from 3.87 to 3.14 eV, which corresponds to the gradual enhancement of fluorescence performance. LFNP also exhibited excellent antioxidant activity, with DPPH free radical scavenging rate increased from 80.8% for LNP up to 96.7% for LFNP, confirming the great potential of these materials for application in biomedicine and cosmetic health care.

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“…As the main component of the cell wall of wood, lignin exhibits a broad range of fluorescence emission and can be excited by both UV and visible light [ 33 ]. Analysis of the physicochemical structures and fluorescence properties of lignin suggests that the aggregation-induced conjugation of phenylpropane units is the main source of visible emission in lignin, leading to the formation of different phenylpropane aggregates in lignin micelles, thus creating a multi-fluorophore system [ 34 , 35 ]. Therefore, the microstructure of lignin plays a crucial role in its complex fluorescence properties due to fluorophore interaction and aggregation behavior.…”

Section: Discussionmentioning

confidence: 99%

Improving the Autofluorescence of Lophira alata Woody Cells via the Removal of Extractives

Yu,

Xu,

et al. 2023

Polymers

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The autofluorescence phenomenon is an inherent characteristic of lignified cells. However, in the case of Lophira alata (L. alata), the autofluorescence is nearly imperceptible during occasional fluorescence observations. The aim of this study is to investigate the mechanism behind the quenching of lignin’s autofluorescence in L. alata by conducting associated experiments. Notably, the autofluorescence image of L. alata observed using optical microscopy appears to be quite indistinct. Abundant extractives are found in the longitudinal parenchyma, fibers, and vessels of L. alata. Remarkably, when subjected to a benzene–alcohol extraction treatment, the autofluorescence of L. alata becomes progressively enhanced under a fluorescence microscope. Additionally, UV–Vis absorption spectra demonstrate that the extractives derived from L. alata exhibit strong light absorption within the wavelength range of 200–500 nm. This suggests that the abundant extractives in L. alata are probably responsible for the autofluorescence quenching observed in the cell walls. Moreover, the presence and quantity of these extractives have a significant impact on the fluorescence intensity of lignin in wood, resulting in a significant decrease therein. In future studies, it would be interesting to explore the role of complex compounds such as polyphenols or terpenoids, which are present in the abundant extractives, in interfering with the fluorescence quenching of lignin in L. alata.

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Effect of microstructure-scale features on lignin fluorescence for preparation of high fluorescence efficiency lignin-based nanomaterials

Cited by 14 publications

References 46 publications

UV‐Induced Oxidation Preparation of Multi‐Functional Lignin‐Based AgNPs and its Application for Conductive Coating, Antibacterial Enhancement, and Product Separation

UV‐Induced Oxidation Preparation of Multi‐Functional Lignin‐Based AgNPs and its Application for Conductive Coating, Antibacterial Enhancement, and Product Separation

One-Step to Prepare Lignin Based Fluorescent Nanoparticles with Excellent Radical Scavenging Activity

Improving the Autofluorescence of Lophira alata Woody Cells via the Removal of Extractives

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