POLYMERS FOR ADVANCED TECHNOLOGIES
·
2024
·Vol. 35
·期 6
·e6481
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IF 3.1
Yuquan Chen,Bin Ren,Xuemei Li,Suhan Rao,Zhangyi Guo,Yufei Li,Ying Huang,Ming Kang,Xiuyun Li
Traditional epoxy resins are made from non-renewable fossil resources, which are difficult to reprocess and recycle, and their flammability makes them unsafe during use. In this experiment, an epoxy resin containing Schiff base (TA-VAN-EP) was synthesized successfully with biomass-derived raw materials. This new material not only had favorable mechanical properties but also had good flame retardancy and degradation properties. The chemical structure of TA-VAN-EP was characterized by Fourier transform infrared (FTIR) spectroscopy and 1 H nuclear magnetic resonance (NMR) spectroscopy. Its mechanical properties, thermal stability, flame-retardant properties, and other properties were tested. The results showed that, compared with the pure epoxy resin (EP), the mechanical properties of TA-VAN-EP were significantly improved, and the glass transition temperature ( T g ) was increased from 152°C to 190°C. Additionally, TA-VAN-EP reached a V-1 rating during the UL-94 test, and the limited oxygen index (LOI) value increased from 24.7% to 28.4%. Also, the total heat release (THR), smoke production rate (SPR), and total smoke release (TSR) decreased extremely. Moreover, TA-VAN-EP demonstrated good degradation performance under acidic conditions. In conclusion, this work provided a new idea for the production of bio-based flame-retardant epoxy resin with promising degradable abilities and mechanical properties.
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COMPOSITES PART B-ENGINEERING
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2024
·
IF 12.7
Jiahui Li,Qi Cao,Yi Zhao,Chengwen Gu,Beitao Liu,Qianqian Fan,Cijian Zhang,Yu Huang,Shuzi Jiang,Xigao Jian,Zhihuan Weng
Bio-based flame retardants have attracted growing attention for sustainability and comparable efficiency to petroleum-based counterparts but suffer from compatibility issues with epoxy resins and the trade-off between strength and toughness. Here, a Schiff base-derived phosphorus-based flame retardant (TV-DOPO) was developed from biobased vanillin and tyramine. In the presence of the binary curing agents, nanoscale in-situ constructive phase separation induced by hierarchical thermal curing process and strong hydrogen bonding provide the composite resin with enhanced both stiffness and toughness. The flexural and impact strengths reached 159 MPa and 55.4 kJ m −2 , which were increased by 36.5% and 129.6%, respectively, compared with the pristine epoxy, meanwhile excellent flame retardance was well maintained (UL-94 V-0 rating). Remarkably, these conjugated phosphaphenanthrene-containing composite resins demonstrate excellent UV-shielding capacity and optical transmittance. In this work, in-situ construction of a crosslinked network with tunable size of phase separation domains can be simply achieved by modulating the ratio of binary curing agents, to fabricate epoxy resins with all-around enhanced performance.
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FOOD CHEMISTRY
·
2024
·
IF 8.5
Chengtuo Niu,Yiyang Liu,Heng Li,Chunfeng Liu,Qi Li
This study aimed to elaborate the biochemical and chemosensory characteristics of doubanjiang fermentation via a two-stage controlled temperature. HL group with variable temperature (40 °C → 30 °C) and NTF group fermented following traditional technique were prepared and their volatile and non-volatile metabolites were compared through multivariate statistical analysis. HL group favored the accumulation of amino acid nitrogen, free amino acids and organic acids in the early stage and maintained adequate total acids and biogenic amines in the mid-late stage. HL group also had preferred jiang and fruity flavor through sensory evaluation. A total of 116 volatile metabolites were identified in HL or NTF groups and 22 marker volatile metabolites were screened through the combinational use of OPLS-DA and Random Forest analysis. Stronger anti-oxidant ability was observed in HL group while adequate number of acidic compounds and biogenic amines were ensured. This indicated that the two-stage controlled temperature fermentation was beneficial for doubanjiang fermentation.
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FOOD CHEMISTRY
·
2024
·
IF 8.5
Tiantian Zhang,Haonan Mi,Shichao Wei,Yuan Xu,Zhao Yang,Shuai Liang,Xuelu Ding
A novel, compact, and automated laser ablation dielectric barrier discharge thin layer chromatography-mass spectrometry (LA-DBD-TLC-MS) device was developed for the rapid detection of biogenic amines (BAs) in fishery products. This plug-and-play system integrates thermal desorption via diode laser, DBD plasma ionization, and tandem MS detection, with key operational parameters optimized through experimental and computational methods. Utilizing nanoscale carbon black as a matrix, the device achieved a detection limit of 0.230 pg/mm 2 . It demonstrated comparable efficacy to HPLC-MS/MS in screening six BAs and enabled species discrimination and spoilage assessment in fish with machine learning algorithms (PCA, RF, SVM, MLP), yielding high accuracies. A multi-linear regression model predicted salmon spoilage with a strong correlation (R 2 = 0.974). This study confirms the LA-DBD-TLC-MS device as a reliable, precise, and high throughput tool for rapid BA analysis in fishery products, with potential for direct trace analysis of organic compounds in food matrices.
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CLINICA CHIMICA ACTA
·
2024
·
IF 3.2
Ting Yang,Bangbang Wei,Jing Liu,Xinxin Si,Lulu Wang,Chunming Jiang
Background Peritoneal dialysis (PD) helps prevent lethal complications of end-stage renal disease (ESRD). However, the clinical outcomes are affected by PD-related complications. We investigated metabolic biomarkers to estimate the clinical outcomes of PD and identify patients at high risk of downstream complications and recurrent/relapsing infections. Methods Metabolites of normal control and ESRD patient were compared via an untargeted metabolomic analysis. Potential metabolic biomarkers were selected and quantified using a multiple reaction monitoring-based target metabolite detection method. A nomogram was built to predict the clinical outcomes of PD patients using clinical features and potential metabolic biomarkers with the least absolute shrinkage and selection operator Cox regression model. Results Twenty-five endogenous metabolites were identified and analyzed. ESRD-poor clinical outcome-related metabolic modules were constructed. Adenine, isoleucine, tyramine, xanthosine, phenylacetyl-L-glutamine, and cholic acid were investigated using the weighted gene correlation network analysis blue module. Potential metabolic biomarkers were differentially expressed between the NC and ESRD groups and the poor and good clinical outcomes of PD groups. A 3-metabolite fingerprint classifier of isoleucine, cholic acid, and adenine was included in a nomogram predicting the clinical outcomes of PD. Conclusion Metabolic variations can predict the clinical outcomes of PD in ESRD patients.
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TALANTA
·
2024
·
IF 5.6
Hang Chen,Xuelin Dong,Kaide Ou,Xin Cong,Yonggui Liao,Yajiang Yang,Hong Wang
Sensing biogenic amine (BAs) content is very important for assessing food freshness. To address the limitations such as small color difference values (ΔE) and complex preparation of probes for visualizing the freshness of seafood, a pH-responsive ratiometric fluorescent probe (EnEB) was prepared by Eu(NO 3 ) 3 , trimeric acid (BTC), and hydrochloric acid norepinephrine (Enr). EnEB emitted blue (446 nm) and red fluorescence (616 nm) originating from Enr and Eu 3+ , respectively, and exhibiting a fluorescence wavelength difference up to 170 nm. The ratiometric fluorescent signals of EnEB showed a linear correlation with pH in the range of 5.5–8.0. Thus, EnEB can rapidly and precisely detect BAs, such as histamine, tyramine, and spermine, with detection limits and response times of 1.14 μmol/L (3 s), 1.04 μmol/L (8 s), and 0.41 μmol/L (2 s), respectively. Furthermore, an EnEB aerogel was prepared by loading EnEB in a matrix formed by polyvinyl alcohol (PVA) and agarose (AG). EnEB aerogel exhibited excellent acid-base gas-sensing properties. The fluorescence color of EnEB aerogel can change significantly with the deterioration of seafood. When seafood changed from fresh to decayed, the ΔE value of EnEB aerogel was as high as 80.9. Importantly, the results of seafood freshness by naked eye using EnEB aerogel was consistent well with the TVB-N content and the freshness standard stipulated by national food standard, indicating EnEB aerogel can accurately visually and real-time monitor seafood freshness. Furthermore, the strategy for sensing food freshness based on EnEB aerogel also offered multiple color variations to indicate fine freshness levels of seafood. This work provided a convenient, efficient, and accurate approach to assessing the freshness of seafood. Additionally, EnEB also has promising applications in security and anti-counterfeiting.
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Food Bioscience
·
2024
·
IF 4.8
Jing Han,Zhenxiao Sun,Yingxi Chen,Jian Guo,Sufang Zhang,Chaofan Ji
Lactiplantibacillus plantarum is known to be widely accepted as starter culture with antibacterial and biogenic amines (BAs) degrading abilities, but its salt tolerance is a crucial factor limiting its effectiveness as a starter for fermentation. In the present study, the adaptive laboratory evolution (ALE) approach was used to enhance the salt tolerance of the parental strain Lpb. plantarum His6-WS. Sixteen salt-tolerant strains were obtained by selection on MRS medium containing 10% NaCl. Compared to the parental strain, the evolved strain Lpb. plantarum H11-ES exhibited excellent genetic stability, a shorter lag period and a higher maximum population density in the MRS containing 8% NaCl. Additionally, the evolved strain Lpb. plantarum H11-ES improved its BAs-degrading ability in high-concentration NaCl environments. Characterization of cell morphology showed that the evolved strain Lpb. plantarum H11-ES had significantly strengthened the integrity and length of cell membrane and cell wall compared to its parent. Furthermore, whole genome resequencing revealed that the mutations in the poly(glycerol-phosphate) alpha-glucosyltransferase (TagE) and the ATP-binding cassette (ABC) transporters likely contributed to the evolution of salt-tolerant by altering cell morphology and participating in membrane transport. Collectively, this study successfully isolated Lpb. plantarum strain with enhanced salt tolerance and amine-degrading abilities, while also highlighting the importance of the cell wall in increasing the salt tolerance. This provides a theoretical basis for future regulation and selection of salt-tolerant LAB.
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SENSORS
·
2024
·Vol. 24
·期 23
·7415
·
IF 3.4
Haichao Ye,Liqin Liu,Dagang Shen,Chang Song,Huanhuan Wang
BF3, volatile amines (VOAs), and biogenic amines (BAs) are the key indicators in chemical reaction catalysis and food quality monitoring. In this study, we present two types of fluorescent sensors, a hydrazone ligand (HL)-based fluorescent sensor for BF3detection and a novel sensor array using six boron difluoride (BF2) hydrazone complexes (BFHs) for monitoring VOAs and BAs. Spectral research indicates that the interaction mechanism between the HLs and BF3is based on intramolecular charge transfer (ICT). The HLs for the monitoring of BF3showed good sensitivity, selectivity, and anti-interference and have the characteristics of a visible color change. Additionally, the HL probe demonstrates reversibility in the presence of triethylamine, making it a candidate for “ON-OFF-ON” mode sensing. BF3detection can also be efficiently performed using test strips for convenient, air-based applications. The BFH sensor array successfully differentiates histamine from the other typical non-volatile BAs in solution; in comparison, the VOAs are analyzed through recognition patterns and statistical analysis. The array’s color changes enable the practical, on-site detection of shrimp spoilage, with principal component analysis distinguishing various ageing intervals. In summary, this sensor array demonstrates high selectivity for VOAs and BAs, with significant potential for application in real-world sample analysis.
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FOOD CHEMISTRY
·
2024
·
IF 8.5
Mian Wei,Huipeng Zhu,Qiang Zhang,Dawei Gao,Lu Wang,Xiaoyu Li
In order to elucidate the digestion, absorption and metabolism mechanism, Hohenbuehelia serotina polysaccharides were successfully labelled by fluorescein isothiocyanate (FITC-Tyr-HSP), with the fluorescent substitution degree of 0.37 %. FITC-Tyr-HSP with excellent physiological stability possessed the significant fluorescent characteristics, which could be dynamically monitored by in vivo fluorescence imaging and high performance gel permeation chromatography-fluorescence detector (HPGPC-FLD). Through investigation of gastrointestinal digestion in vitro , the degradation of HSP was only occurred in small intestinal fluid. The results of in vivo studies also confirmed that a small amount of HSP were degraded in small intestine, and then absorbed by intestinal epithelial cells to enter into the bloodstream, reaching to liver, spleen and kidney. Meanwhile, most of HSP that could not be digested were directly transported to cecum and colon, where they were metabolized by gut microbiota to produce SCFAs, with the total content of which reached to 60.52 mmol/L after gavage for 24 h. Ultimately, the polysaccharides were excreted from the body mainly by feces and urine pathways. This study is meaningful for providing a practical basis to elucidate the digestion, absorption and metabolism of polysaccharides.
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ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Pan Tang,Qi Chen,Ye Jiang,Li Li,Xiaomin Zhang,Ningya Yu,Shengpei Su,Yidan Jing,Jin Zhu
Traditional printed paper, due to its irreversible chromogenic properties, is difficult to recycle. Thus, developing an ecofriendly storage carrier that allows for reversible information recording is one of the current research priorities. However, the thermal reversible information storage carriers reported so far have difficulty forming a stable structure, which limits their large-scale application. In this study, a novel color developer, 1-(4-hydroxyphenethyl)-3-octadecylurea (PCU), was synthesized using p-hydroxyphenylethylamine and octadecyl isocyanate. By combining it with fluoran dyes (FDs) and introducing natural cellulose as a binder resin, we successfully prepared a thermoreversible color-changing cellulose film with excellent color development performance. This film has a tensile strength of over 40 MPa and an elongation of over 10% and exhibited stable and efficient rewritable performance in 50 cycles of color development tests. Furthermore, it maintains a high color density for up to 20 weeks, and environmental factors such as temperature, humidity, and sunlight exposure have minimal effect on its color display and retention capabilities. Building upon this, application scenarios, such as ink-free stamping, thermal printing, and information encryption, have been further designed. The results show that the film’s ink-free stamping is simple and effective, thermal printing patterns are clear, and information encryption is convenient and straightforward, demonstrating broad application prospects and providing a new approach to the fabrication of novel reversible information storage carriers.
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FOOD CONTROL
·
2024
·
IF 5.6
Zhen Wu,Yi Wei,Yue Tang,Lian Xia,Xiaojuan Niu,Yuangen Wu
Food poisoning caused by excessive intake of histamine is a significant public health concern. Traditional analytical methods struggle to meet the demands for on-site monitoring of histamine in food. Colorimetry based on nanozyme catalysis can be applied to rapidly detect histamine, but some challenges remain in the specific response of nanozymes to histamine. Herein, a novel “off-on” colorimetric sensor was first established for histamine detection based on Cu 2+ -mediated laccase-mimic activity of flower-like Mn 3 O 4 nanoparticles ( Mnf ). This work proved that Cu 2+ can inhibit the laccase-mimic activity by hindering the electron transfer between Mnf and 2,4-DP molecules. Once histamine was present in the system, Cu 2+ was first consumed due to the coordination with histamine, resulting in the recovery of laccase-mimic activity of Mnf . The color of sensing solution can be converted to the corresponding RGB value by a smartphone for on-site detection of histamine in food. The colorimetric sensor has a limit of detection as low as 0.148 μg mL −1 , which is comparable to that of most colorimetric methods. Moreover, the colorimetric sensor exhibits high selectivity, and has considerable applicability for histamine detection in aquatic products.
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INDUSTRIAL CROPS AND PRODUCTS
·
2025
·
IF 6.2
Yanna Zhao,Yingying Zhang,Xiaowei Bai,Yuqi Wang,Yiqing Li,Shuai Yang
Vitrimer has become an emerging application to solve the problem of thermoset pollution and resource wastage due to its reversible cross-linked network structure that enables reuse and recycling of materials. However, it is still challenging and difficult to achieve full bioresourcing and to prepare recycling pathways with excellent mechanical strength and high efficiency. In this study, a bisphenol derivative monomer with imine bonds was first synthesized with tyramine (TA) and terephthalaldehyde (TPA), and then the monomer was used together with 4,4′-diaminodiphenyl disulfide (4-AFD) to co-cure epoxidized soybean oil (ESO) to construct an epoxy vitrimer material (ETA) with a bi-dynamic network structure. ETA-3 exhibits high 5 % thermal stability T d 5 % (319.17 °C) and energy storage modulus E (2085.35 MPa). Notably, due to the fact that it exhibits a short relaxation time (32.24 s) and low activation energy (70.07 KJ/mol), ETA can achieve the repair of scratches within 30 min at 100 °C. This test demonstrates that ETA vitrimer has a better self-repairing performance, which contributes to the continuous development of vegetable oil-based polymeric materials.
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