SCIENCE OF THE TOTAL ENVIRONMENT
·
2023
·
IF 9.8
Qiong Wen,Na Liu,Ruohua Qu,Fei Ge
The photoaging of microplastics (MPs) accumulated in the sea can be influenced by humic acid (HA). However, the role of salinity cannot be ignored, as it may potentially disrupt the interaction between MPs and HA, thereby altering the photoaging of MPs. Herein, this study investigated how salinity influences the effect of humic acid (HA, derived from lignite) on the photoaging of polystyrene microplastics (PS MPs) in artificial and natural seawater. The results revealed that HA promoted the photoaging of PS MPs under both low (5 PSU) and high salinity (35 PSU) in light conditions (L), reflected in the formation of fragments, the production of oxygen–containing functional groups (O H, C O, and O C O), and the increase in hydrophilicity of PS MPs. Furthermore, high salinity promoted the photoaging of PS MPs with HA more significantly, as evidenced by the similar indicators and the order of oxygen/carbon atom ratio (O/C): L–HA–High (0.15) > L–HA–Low (0.10) > Unaged (0.02). Interestingly, due to the reduction of electrostatic repulsion, the adsorption of HA on photoaged PS MPs in natural and artificial high salinity seawater was 1.77 mg/g and 0.39 mg/g, respectively, which was significantly higher than those PS MPs photoaged in the low salinity seawater. Furthermore, the electron spin resonance (ESR) results confirmed that more hydroxyl radicals ( OH) were generated after adsorbing HA under high salinity conditions, thus promoting the fragmentation and oxidation of PS MPs. Overall, our findings highlight the crucial role of salinity in influencing the photoaging of MPs with HA and help to assess the marine risk of MPs accurately.
研究领域:
环境科学
·
海洋学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Frontiers of Environmental Science & Engineering
·
2022
·Vol. 17
·期 4
·1-14
·
IF 6.048
Liu Weiyi,Pan Ting,Liu Hang,Jiang Mengyun,Zhang Tingting
The photo-aging behavior of microplastics (MPs) in natural environment has become a global concern. The ultraviolet radiation has enough energy to change the polymer structure and physical-chemical properties of MPs. Less attention has focused on the interactions of the photo-aged polar and biodegradable MPs with organic pollutants. This work investigated the structural properties of aged polar polyamide (PA) MPs and biodegradable polylactic acid (PLA) MPs exposed to ultraviolet irradiation and their adsorption behavior and mechanism for neonicotinoid insecticide imidacloprid (IMI). The results showed that the MPs had extensive changes in surface morphology and chemical properties after photo-aging. The C−N bond of PA MPs was disrupted to form more carbonyl groups. The oxygen-containing functional groups on the surface of aged PLA MPs were broken and generated relatively smaller molecules. The adsorption capacity of IMI on PA MPs decreased by 19.2 %, while the adsorption capacity of IMI on PLA MPs increased by 41.2 % after photo-aging. This depended on the natural structure of the MPs and their ability to absorb ultraviolet light. The electrostatic interactions, hydrogen bonds, van der Waals interactions, and polar-polar interactions were the main adsorption mechanisms of IMI on MPs. High initial solution pH and low ionic strength favored the adsorption of IMI by altering charge distribution on the MPs surface. The formation of the humic acid-IMI complexes decreased the concentration of IMI in the water phase and further decreased the adsorption on MPs. These results are enlightening for a scientific comprehension of the environmental behavior of the polar MPs.
研究领域:
环境科学
·
生态学
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Shuai Tang,Shengjia Ma,Lujian Lin,Yimei Ding,Xiaoting Zhang,Xiaowei Wu,Qun Zhang,Md. Nahid Pervez,Chengjin Cao,Yaping Zhao
Face masks have emerged as a significant source of microplastics (MPs) under the influence of biotic and abiotic interactions. However, the combined effects of abiotic photoaging and biofilm-loading on mask-derived MPs as carriers of metal ions are not clear. We investigated the Pb(Ⅱ) adsorption onto polypropylene (PP) and polyurethane (PU) mask-derived MPs treated by photoaging, biofilm-loading, and both combinations, evaluating the composite risks. PU mask-derived MPs (1.15 7.47 mg/g) exhibited greater Pb(Ⅱ) adsorption capacity than PP mask-derived MPs (0.84 2.08 mg/g) because of the presence of intrinsic carbonyl functional groups. Photoaging (30.5%, 88.4%), biofilm-loading (110.7%, 87.1%), and both combinations (146.7%, 547.0%) of PP and PU masks enhanced Pb(Ⅱ) adsorption compared to virgin mask-derived MPs due to the increase of oxygen-containing functional groups. High-throughput sequencing indicated that the structural morphology and chemical composition of masks significantly affected the microbial community. Adsorption mechanisms involved electrostatic force and surface complexation. A combination of photoaging and biofilms increased the ecological risk index of mask-derived MPs in freshwater, showing the risk level to be high (PP mask) and very high (PU mask). This research highlights the crucial role of photoaging combined with biofilms in controlling metal ion adsorption onto mask-derived MPs, thereby increasing the composite risks.
研究领域:
环境科学
·
生态学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Quanyun Ye,Junfei Li,Dong Zeng,Ronghui He,Peiran Li,Jie Pan,Wencheng Wu,Dechun He
Nanoplastics experience complex aging processes when exposed to the environment, leading to substantial modifications in their physicochemical properties. These transformations significantly influence their interaction with mineral colloids, consequently altering their migration and fate. This study systematically investigated the homoaggregation of pristine and UV irradiation aged polystyrene nanoplastics (PSNP), as well as the heteroaggregation with alumina (Al 2 O 3 ) minerals under different water chemical conditions. The results showed that photoaging not only altered the surface morphology of PSNP, but also increased their surface negative charge and generated oxygen-containing functional groups, thereby improving the stability of the aged PSNP. Al₂O₃ heteroaggregated with PSNP, leading to a decrease in stability. The interaction between Al₂O₃ and aged PSNP was more pronounced compared to pristine PSNP. The pH value and ionic strength significantly influenced heteroaggregation, with acidic conditions and low ionic strength promoting heteroaggregation through stronger electrostatic attraction. Bivalent electrolytes (Ca 2+ ) were more effective than monovalent electrolytes (Na + ) in inducing PSNP heteroaggregation, as more carboxyl groups of PSNP were generated after photoaging, which combined with Ca 2+ through the bridging effect and enhanced the heteroaggregation. Furthermore, the heteroaggregation behaviors of both pristine/aged PSNP and Al 2 O 3 followed the DLVO theory. The findings revealed the important controlling effect and mechanism of UV irradiation and Al 2 O 3 on the fate of nanoplastics in aquatic environments.
研究领域:
环境科学
·
胶体化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
·
2025
·
IF 3.5
Yan-Xia Li,He Ma,Le Shi,Zhong-Fei Zhang,Yu-Meng Wu,Chao Yan,Yan Chen,Yong-Ming Lu
BACKGROUND Polysaccharides from Pleurotus citrinopileatus exhibit diverse bioactivities, yet their efficacy against ultraviolet B (UVB)-induced photoaging remains unexplored. This study aimed to purify and characterize a specific PCP and assess its protective effects using a UVB-induced zebrafish model. RESULTS A polysaccharide, designated as PCP-2, was isolated from P. citrinopileatus through hot-water extraction, ultrafiltration and chromatography. PCP-2 is a galactoglucan with a molecular weight of 1.52 × 10 6 Da, predominantly composed of 1,4-linked glucopyranosyl and 1,4,6-linked galactopyranosyl residues. In UVB-exposed zebrafish, PCP-2 administration resulted in a significant reduction of reactive oxygen species and malondialdehyde levels, alongside enhanced activities of antioxidant enzymes, including superoxide dismutase, catalase and glutathione peroxidase. Additionally, PCP-2 inhibited apoptosis by upregulating Bcl-2 expression and downregulating caspase-3. It also attenuated cellular senescence, as indicated by decreased β -galactosidase activity and increased telomerase activity. Moreover, PCP-2 promoted the synthesis of type I and III collagen by suppressing matrix metalloproteinases MMP-1 and MMP-3 and reduced melanin production through the downregulation of tyrosinase expression. Mechanistic studies suggested that these protective effects are mediated via activation of the Nrf2/HO-1 signaling pathway. CONCLUSION PCP-2 from P. citrinopileatus effectively mitigates UVB-induced photoaging, primarily by activating the Nrf2/HO-1 pathway. These findings suggest PCP-2's potential as an anti-photoaging agent in both food and pharmaceutical industries. © 2025 Society of Chemical Industry.
研究领域:
生物化学
·
药理学
·
食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF VINYL & ADDITIVE TECHNOLOGY
·
2021
·Vol. 28
·期 2
·405-417
·
IF 1.993
Zhiping Xu,Zhenhua An,Yan Ye,Rui Yang
Owing to the widespread use of polypropylene (PP) nanocomposites, their stability in the environment is becoming increasingly relevant. Accordingly, a systematic study of the relationship between the characteristics of inorganic nanofillers and the environmental aging behavior of PP is necessary to determine the service life of PP nanocomposites in outdoor environments. Therefore, in this study, we systematically investigated the effects of the chemical composition, particle size, crystalline form, and amount of inorganic filler (CaCO 3 , Al 2 O 3 , SiO 2 , and ZnO) on the outdoor aging behavior of PP. The results of outdoor aging experiments showed that the filler composition affects the aging behavior of PP. It was found that SiO 2 and ZnO nanoparticles accelerate and retard the outdoor aging of PP, respectively. In addition, PP composites containing inorganic fillers with relatively large particles or more stable crystalline forms exhibit relatively slow aging. In the case of the fillers other than ZnO nanoparticles, increasing the filler content accelerates the outdoor aging of PP. The evolution of cracks in the exposed surfaces of PP composites during outdoor aging was observed by scanning electron microscopy. The CO 2 generated by PP composites during in situ gaseous degradation product detection corresponds well with the results of the outdoor aging experiments. This study elucidates the effects of inorganic fillers on the outdoor aging behavior of PP.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
DRUG DEVELOPMENT AND INDUSTRIAL PHARMACY
·
2021
·
IF 3.232
Jing Li,Weilong Ni,Mayinuer Aisha,Juanjuan Zhang,Minjie Sun
As a natural flavonoid compound, rutin could scavenge free radicals effectively to achieve remarkable antioxidant and anti-photoaging activity. Unfortunately, the extremely low water solubility of rutin often leads to the poor percutaneous permeability and unsatisfactory bioavailability, which has greatly restricted its clinical application. In this study, a novel freeze-dried rutin nanocrystal was developed to improve its saturation solubility, which was further redispersed in carbopol gel to formulate the targeted rutin nanocrystal gel (NC-gel) for enhanced transdermal delivery efficiency. Benefit from the advantages of NC-gel, the permeated amounts of rutin on mice in the NC-gel group was more than three times enhancement over that of the coarse drug gel group. Furthermore, the results of pharmacodynamic studies in vivo demonstrated that NC-gel could effectively prevent the skin photoaging and tissue damage induced by UV irradiation. Taken together, these results validated that NC-gel was an ideal carrier for the epidermal application of rutin to obtain excellent anti-photoaging effect, which further might provide a valuable platform for improving the transdermal bioavailability of insoluble drugs.
研究领域:
药剂学
·
皮肤生物学
·
药物递送系统
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BIOMEDICINE & PHARMACOTHERAPY
·
2023
·
IF 7.5
Chang Liu,Xiao Guo,Yutong Chen,Meijun Zhao,Shuai Shi,Zheng Luo,Jian Song,Zhihong Zhang,Wenchuang Yang,Keyi Liu
Prolonged exposure to UV light can lead to photo-ageing of the skin. Therefore, the development and application of anti-photoaging drugs is urgent. In this study, we co-loaded apigenin (Apn) and doxycycline (Doc), a broad-spectrum inhibitor of matrix metalloproteinases (MMPs), into flexible liposomes to exert anti-photoaging effects by combating oxidative stress, anti-inflammation, reducing the activation of MMPs and preventing collagen loss. The results showed that we prepared a flexible liposome (A/ D -FLip) containing Apn and Doc. Its appearance, particle size and Zeta potential were normal and it had good encapsulation efficiency, drug loading, in vitro release and transdermal efficiency. In cellular experiments, A/ D -FLip could inhibit oxidative stress damage, reduce inflammatory factors and decrease the activation of MMPs in Human immortalized keratinocytes (HaCaT) cells; in animal experiments, A/ D -FLip could inhibit skin damage and reduce skin collagen loss by decreasing the activation of MMPs, thus inhibiting skin photoaging in mice. In conclusion, A/ D -FLip has good anti-photoaging effects and it has the potential to become an effective skin care product or drug against UV damage and skin photoaging in the future.
研究领域:
药剂学
·
皮肤科
·
美容护肤品
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2023
·
IF 8.8
Yajun Tian,Jianyu Zhu,Chuhan Ying,Hongwei Luo,Shoufeng Zhang,Liqiu Zhang,Renna Li,Jun Li
Microplastics (MPs), antibiotics and microorganism ubiquitously coexist in aquatic environments. MPs inevitably undergo photoaging processes in aquatic environments, affecting the interactions between MPs and antibiotics and the antibiotic resistance of microorganism. In this study, the impact of photoaging processes of MPs on their adsorption behavior of tetracycline (TC) and related formation of antibiotic resistance were investigated. It was found that the photoaging processes significantly increased the adsorption capacity of TC onto MPs, with the Q e increasing from 0.387 to 0.507 mg/g at 288 K and from 0.507 to 0.688 mg/g at 308 K. The site energy distribution (SED) analysis further confirmed that the enhanced adsorption capacity was attributed to more high-energy adsorption sites acquired from MPs photoaging processes. Moreover, the enhanced adsorption of TC further facilitated the formation of seven antibiotic resistance genes (i.e., tetA , tetB , tetC , tetD , tetE , tetG , tetK ) when MPs adsorbed with TC was covered by biofilm. This study helps comprehensively understand the environmental behaviors of co-existing MPs, antibiotics and microorganisms, providing a theoretical basis for evaluating and mitigating their coexistence risks.
研究领域:
环境科学
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Zhexian Wang,Hongkui He,Yunbo Zhai,Zhixiang Xu,Yongxing Chen,Xiangmin Liu
The photoaging processes of microplastics (MPs) under various conditions, including environmental factors and soluble organic matter, have been extensively investigated. However, a notable gap exists in the literature regarding comparative experiments on the photoaging of polyolefin-type MPs, and research on different light sources is particularly scarce. This research involved exposing representative MPs (polystyrene (PS), polyvinyl chloride (PVC), and polyethylene (PE)) to light with different wavelength ranges (200–2000 nm and 320–780 nm). Results indicated that PS and PVC , with benzene rings and C-Cl chains, exhibited higher susceptibility to photoaging compared to PE, leading to changes in physicochemical properties. In 200–2000 nm, including UVC (200–280 nm) and UVB (280–315 nm), a pronounced PS and PVC photoaging process was observed due to their higher energy, which resulted in noticeable yellowing of the morphology. PE showed less pronounced effects, except for noticeable aging in the 320–780 nm range within 6 h (UV–vis spectrum), with a slow depolymerization rate over 72 h. Furthermore, a limited aging of polyolefins was observed under dark conditions. In summary, this study provides crucial insight into the accelerated photoaging of polyolefin-type MPs under different light source, which offers novel perspectives and references for future research directions.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Evidence-based Complementary and Alternative Medicine
·
2021
·Vol. 2021
·期 1
·9962007
·
IF 2.63
Zhenzhuo Li,Rui Jiang,Jianzeng Liu,Xiaohao Xu,Liwei Sun,Daqing Zhao
Here, we evaluated the in vivo skin-protective effects of topical applications of Panax ginseng C. A. Meyer extract (PG2) and its phenolic acid- (PA-) based components against UVB-induced skin photoaging. PG2 or PA applied to skin of hairless mice after UVB-irradiation alleviated UVB-induced effects observed in untreated skin, such as increased transepidermal water loss (TEWL), increased epidermal thickness, and decreased stratum corneum water content without affecting body weight. Moreover, PG2 and PA treatments countered reduced mRNA-level expression of genes encoding filaggrin (FLG), transglutaminase-1 (TGM1), and hyaluronan synthases (HAS1, HAS2, and HAS3) caused by UVB exposure and reduced UVB-induced collagen fiber degradation by inhibiting the expression of matrix metalloproteinase genes encoding MMP-1, MMP-2, and MMP-9. Meanwhile, topical treatments reduced cyclooxygenase-2 (COX-2) mRNA-level expression in photodamaged skin, leading to the inhibition of interleukin-1 β (IL-1 β ) and interleukin-6 (IL-6) mRNA-level expression. Thus, ginseng phenolic acid-based preparations have potential value as topical treatments to protect skin against UVB-induced photoaging.
研究领域:
药理学
·
皮肤科学
·
植物化学
✓ 已验证
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2022
·
IF 6.449
Shiqin Liu,Yuxiang Huang,Qiuqin Lin,Yanglun Yu,Wenji Yu
Wood is a traditional green and renewable environmental-friendly material, but some wood with high polyphenol content is prone to irregular color changes during processing. In this study, ferrous ion (Fe (II)) solution of various mass fractions (0.05%, 0.1%, 0.5%, 1%) was used to immobilize polyphenols in eucalyptus veneers and induce discoloration. With the increase of the Fe (II) concentration, the complexes formed by Fe (II) and polyphenols in the veneers not only enriched the surface, but also began to gather in the cell cavity of wood rays and vessels. The overall color of the veneers became darker and the surface became more hydrophobic with a maximum contact angle of 120°. In addition, the 40-hour xenon lamp aging test showed that the veneer treated with 0.1% Fe (II) had the best light-aging resistance and its color difference was less than 7 and remained stable. Eucalyptus veneers with induced discoloration can not only avoid irregular color changes in subsequent processing, but also meet the differences in people's esthetic perception.
研究领域:
材料科学
·
木材化学
·
表面化学
✓ 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）