JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
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2023
·Vol. 103
·期 6
·3129-3138
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IF 4.1
Zonghan Wang,Chao Guo,Deyang Li,Dayong Zhou,Donghong Liu,Beiwei Zhu
BACKGROUND Epigallocatechin-3-gallate (EGCG) is well known for excellent chain-breaking antioxidant capability. However, browning by oxidation and aggregation of EGCG is a non-negligible defect that hinders its applications as an antioxidant in various foodstuffs. Therefore, how to eliminate or mitigate browning efficiently, while retaining functionalities as food additive is a challenge in the food industry. RESULTS Our results demonstrated that EGCG could be anchored within the internal cavity of γ-cyclodextrin (γ-CD) to form an inclusion structure, where hydrophobic interaction, hydrogen bonding, and π-stacking were identified to be the primary drivers. The interplay between two molecules and the steric hindrance from γ-CD could restrict the motion and aggregation of EGCG efficiently, thus alleviating the browning effect. In addition, the conformational adaption of EGCG within the inclusions would result in general decreases in hydrogen-bond dissociation enthalpies for the pyrogallol-type structure on the b ring, thus enhancing the antioxidant capability. In practical application, the nanoscale γ-CD/EGCG inclusion complexes were validated preliminarily as efficient additives in the preservation of shrimp surimi, presenting significant effects on prolonging the shelf-life of products. CONCLUSION Here, nanoscale γ-CD/EGCG inclusion complexes as alternatives to EGCG were tailored as food antioxidants for the preservation of shrimp surimi products, exerting antioxidant effects while mitigating the browning effects of EGCG on products. Through self-assembly, EGCG would be anchored with the cavity of γ-CD, which could regulate the release modes and restrict the aggregation of EGCG. This facile strategy has great potential in food preservation. © 2023 Society of Chemical Industry.
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Energy & Environmental Science
·
2022
·Vol. 15
·期 12
·5379-5390
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IF 39.714
Yuchen Li,Qikai Li,Xinbo Zhang,Jiajia Zhang,Shuaihua Wang,Liuqin Lai,Kang Zhu,Weishu Liu
Quasi-solid-state ionic thermoelectric (i-TE) cells have attracted increasing interest due to their high thermopower and easy solution processability for flexible and wearable thermoelectric devices. However, many i-TE gels have drawbacks of a narrow working temperature range (ΔTmax) and low power density. In this study, we introduced glutaraldehyde into the gelatin-KCl-FeCN4−/3− matrix, forming strong covalent bonds and interconnected porous structures, which significantly improve ΔTmax from 9 °C to 23 °C. The formed gelatin/GTA polymer network increases the entropy difference between the redox couples of FeCN4−/3−, thereby enhancing its thermopower. For the first time, a high thermopower of 24.7 mV K−1, a record-high power density of 9.6 mW m−2 K−2 and a 2 h energy density (E2h) of 198 J m−2 are achieved simultaneously in a quasi-solid-state i-TE cell. The i-TE cell exhibits good cycling performance in long-term power generation, corresponding to an average E2h value of 175 J m−2 after the whole cycling process. A flexible and wearable device consisting of 16 i-TE cells can generate a high voltage of 3.6 V and an output power of 115 μW by harvesting body heat. This work provides a general route to increase the working temperature range and output power density of gel-based i-TE cells through a molecular-level approach.
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Journal of Physical Chemistry C
·
2023
·
IF 3.7
Yantao Dong,Wei Xu,Xue Lan,Hongsheng Mo,Xiaozheng Lan,Jiandang Liu,Bangjiao Ye,Hongjun Zhang
Organic ionic plastic crystals (OIPCs) are promising solid electrolytes. To observe the effect of defects and a mixed OIPC matrix on ionic conductivity, lithium-ion transfer and chloride-ion transfer in chiral and racemic (+/±)-3-hydroxyquinuclidinium perchlorate plastic crystals were studied. The pure chiral material and racemic mixture and their corresponding doped mixtures showed different thermal behaviors. Powder X-ray diffraction revealed that the cubic crystal structure appeared in both the high-temperature phase of the pure chiral material and the whole temperature range for the racemic system. Solid-state nuclear magnetic resonance spectra indicated the possible ion mobility of the two undoped matrices. The lithium-ion conductivity in the chiral material (above −10 °C) and racemic mixture (in the whole temperature region) increased 2.5–3 orders of magnitude, while the chloride-ion conductivity in the chiral material only increased obviously above 50 °C. Positron annihilation lifetime spectroscopy demonstrated the dependence of ionic conductivity on defect volumes of the pure chiral material and its doped mixtures, and the defects of the doped mixtures expanded largely. The ionic conductivity and defect volume of the doped mixtures containing lithium ions and chloride ions qualitatively obeyed the Cohen–Turnbull free volume theory.
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FOOD CHEMISTRY
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2022
·
IF 9.231
Wenxiu Zheng,Lin Ren,Wenzhuo Hao,Lei Wang,Changhong Liu,Lei Zheng
The stability of hydrophobic bioactive compound indole-3-carbinol (I3C) is a challenge for application. In this work, Pickering emulsions were prepared to encapsulate I3C. As the emulsifier, high amylose corn starch was pretreated by acid hydrolysis, afterwards modified by different concentrations of octenyl succinic anhydride (OSA), and their emulsions were evaluated. The XRD, SEM and FTIR results indicated the successful modification. ζ-potential, mean droplet size and emulsification index (EI) of the emulsions confirmed that modified starch with a higher degree of substitution (DS) was more effective for enhancing the storage stability. The results of encapsulation efficiency (EE) and retention degree of I3C after 14 d also proved the assumption. Moreover, the Pickering emulsions protected I3C against ultraviolet light and achieved controlled release in vitro . The food-grade Pickering emulsion loading I3C is promising to be used as a nutrient or dietary supplement for food applications.
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ORGANIC PROCESS RESEARCH & DEVELOPMENT
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2022
·
IF 3.858
Xiangxiang Wang,Youyu Xie,Zhicai Wang,Ke Zhang,Hualei Wang,Dongzhi Wei
We developed a continuous flow system using ω-transaminase covalently immobilized on an epoxy resin modified with ethylenediamine (EDA) to synthesize (S)-1-Boc-3-aminopiperidine, which is a key intermediate for several novel inhibitors. A second functional group (−NH3+) was introduced to rapidly adsorb ω-transaminase, which was further rigidified by multipoint covalent attachment to the modified resin with high binding efficiency (>95%) and activity recovery (75%). The resulting immobilized ω-transaminase was stable with 90% residual activity after 15 reuse cycles. We synthesized (S)-1-Boc-3-aminopiperidine using this continuous flow system, and 95% conversion was obtained within 10 min of residence. The system was continuously operated for 24 h and achieved a space–time yield of 930.73 g·L–1·day–1, indicating outstanding reaction efficiency. This efficient continuous bioprocess has potential for large-scale production of (S)-1-Boc-3-aminopiperidine.
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CORROSION SCIENCE
·
2022
·
IF 7.72
Youmin Qiu,Jie Li,Yifeng Bi,Xiaopeng Lu,Xiaohui Tu,Junjie Yang
A novel mixture, comprising sodium fluoride (NaF) and 3-amino-1,2,4-triazole-5-thiol (ATT), was reported as an effective hybrid corrosion inhibitor for magnesium alloy in pH neutral NaCl solution. The highest efficiency (95.8%) was achieved when 50 mM NaF and 5 mM ATT were mixed. Both experimental and theoretical approaches were employed for addressing the synergism. The synergism was proposed as the formation of a double-layered inhibitors film, in which the lower layer is a uniform fluoride-enriched precipitate layer and the upper one is a hydrophobic adsorption layer. These two layers were mutually strengthened to produce an excellent inhibition effect as a whole.
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JOURNAL OF CATALYSIS
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2022
·
IF 8.047
Xin-Xin Fu,Jian-Peng Li,Zhuo-Qian Li,Yan Liu,Chen-Xiao Feng,Hai-Yang Wang,Zhi-Peng Zhao,Qiao-Yun Liu,Zhong-Yi Liu,Zhi-Kun Peng
Biomass is a promising renewable carbon resource, and bio-based platform molecules such as furan derivatives play an important role in the green manufacturing of high value-added chemicals. Of these, the conversion of 2-methylfuran (2-MF) to 3-acetyl-1-propanol (3-AP) over a bifunctional catalyst has attracted significant interest. However, bifunctional catalysts prepared by traditional method suffer from poor catalytic performance and limited stability due to the agglomeration of metal NPs. Here, Pd@HZSM-5, in which Pd NPs were encapsulated in HZSM-5 in situ showed improved stability and 3-AP yield. The highest yield of 3-AP (90.6%) to date was obtained with a nearly 100% conversion of 2-MF. The catalytic performance over a series of Pd@Zeolite confirms the superiority of the encapsulation effect, which is ascribed to the optimal adjustment of metal/acid balance. The Pd@HZSM-5 catalyst displayed excellent stability due to the encapsulation structure, which restricts the Pd NPs agglomeration. The highest yield of 3-AP was obtained at a high concentration of 2-MF (60%), which implies a promising strategy for the green industrial manufacture of 3-AP. This work reports a new bifunctional catalytic system for the green synthesis of 3-AP from 2-MF, thus stimulating the downstream biomass market.
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EUROPEAN POLYMER JOURNAL
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2022
·
IF 5.546
Xianqiang Zeng,Liguo Wang,Yan Cao,Chen Liu,Ziqiang Han,Peng He,Huiquan Li
Aliphatic polyethers are synthesized byring-opening polymerization (ROP) of the most common epoxide monomers, such as ethylene oxide (EO) and propylene oxide (PO). 1,2-Butylene oxide (BO) and tetrahydrofuran (THF) are potentially extended ROP monomers, which can give polyether unique properties. In this work, a series of poly(1,2-butylene oxide- stat -tetrahydrofuran)s (PBO- stat -PTHFs) with M n of 900–3700 g·mol −1 were synthesized by cationic ring-opening polymerization (CROP) of BO with THF using strong Lewis acid Rare Earth triflates (RE(OTf) 3 ) as catalysts and diols as an initiator at room temperature. PBO- stat -PTHFs product with yield up to 90 %, narrow polydispersity of Đ <1.30, and molar ratio of PBO to PTHF 1:1 were obtained. The copolymerization process was studied by in-situ IR and 1 H NMR spectroscopy analysis, and the results showed that PBO- stat -PTHF is a statistical copolymer. The early stage of the polymerization reaction was dominated by the activated chain end mechanism (ACEM), which incorporates a large amount of THF into the polymer chains. However, the late stage of the polymerization reaction was dominated by the activated monomer mechanism (AMM), which incorporates a large amount of BO into the polymer chains. Most PBO- stat -PTHFs have a suitable M n range, super high viscosity index (≥198) and low pour point (≤-53 °C), which can be used as a lubricant base oil and additives. In addition, PBO- stat -PTHFs have excellent miscibility with polyalphaolefin (PAO), which could significantly improve the PAO viscosity index. This study provides a mild route to construct high-performance copolyether materials through cationic ring-opening controllable polymerization.
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ACS Catalysis
·
2022
·
IF 13.7
Yuan Yu,Ru-De Lin,Yao Yao,Ming-Liang Shi,Wei-Fan Lu,Na Wang,Xiao-Qi Yu
An enzyme–photocatalyst hybrid system has been developed for aldehyde-based indole C-3 acylation. The concept of this process is to form a C–N bond through the three-component Mannich reaction of aldehydes, amines, and indoles, thereby introducing an aminomethyl group on the indole ring. Next, this system catalyzed the formation of the corresponding imide ion from the Mannich product, followed by rapid hydrolysis to give the final C-3 carbonyl indole product. More than 30 indole C-3 acylated products (up to 93% yield) were successfully synthesized under mild conditions, and indole derivatization of two bioactive substances (probenecid and cholesterol) was realized. The mechanistic study provides theoretical support for the construction of photoenzyme catalytic systems. This is an example of enzyme–light-activated C-3 acylation of indoles under very mild reaction conditions, without the use of transition metal catalysts, metal salts, and additional oxidants. This efficient enzyme–photocatalyst hybrid system provides a strategy for the development of photoenzyme catalysis fields.
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SENSORS
·
2021
·Vol. 22
·期 1
·8
·
IF 3.576
Xufang Huang,Wei Sheng,Haonan Chen,Biao Zhang,Na Huang,Shuo Wang
A competitive fluorescence immunoassay for the quantitative detection of 2-amino-3-methylimidazo [4,5-f] quinoline (IQ) in pan-fried meat patties was developed, using magnetic nanoparticles coupled with coating antigen as the capture probe and anti-IQ antibody coupled with NaYF4: Yb, Er upconversion nanoparticles as the signal probe. Under optimal conditionals, the wide detection range for IQ in phosphate buffer saline is from 0.01 to 100 μg·L−1(R2= 0.991) with a detection limit of 0.007 μg·L−1. This proposed method has been applied to detect IQ in two different types of pan-fried meat patties at varying frying times, and the IQ content in chicken patties and fish patties are 2.11–3.47 μg·kg−1and 1.35–2.85 μg·kg−1, respectively. These results are consistent with that of the ultraperformance liquid chromatography-tandem mass spectrometry. In summary, this method can serve as a sensitive and specific test tool for the determination of IQ in processed meat.Keywords:2-amino-3-methylimidazo [4,5-f] quinoline;upconversion nanoparticles;magnetic separation;fluorescence immunoassay;heat processed meat
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2021
·
IF 7.963
Pu Wang,Lipin Li,Yu Tian,Li Sun,Wei Zhan,Shixuan Chen,Jun Zhang,Wei Zuo
Removal and recovery of phosphorus (P) from wastewater is beneficial to both environmental protection and resource sustainability. Enriching the low concentration of P in wastewater will greatly facilitate the effective recovery of P. To enhance the adsorption performance and recyclability of adsorbents for low concentration P-containing wastewater, a novel three-dimensional (3D) graphene/La(OH) 3 -nanorod aerogel (GLA) was prepared by a unique self-assembly process in this study. Benefiting from the large specific surface area of graphene aerogel , which provides sufficient loading sites for the favorable dispersion of La(OH) 3 nanorods, the GLA achieves an excellent P adsorption capacity of 76.85 mg/g. It is also highly selective for P, with adsorption capacity reduced by only 14% and 11% under the interference of high concentration of dissolved organic matter or multiple competing anions respectively. Further mechanistic investigation revealed that the whole adsorption process consists of three stages: (1) ion-exchange process; (2) La P inter-sphere coordination process; and (3) crystal evolution process. In the continuous flow adsorption-desorption cycles, the P concentration was concentrated ~25 times that of the feeding water (2 mg P/L). To our knowledge, this is the first time that La-modified graphene aerogel has been studied for P recovery. This provides a new method for the P removal and recovery of low concentration P-containing wastewater.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
·
IF 8.128
Ruge Zhao,Luming Wu,Rui Chen,Pingchuan Sun,Tiehong Chen
Developing cost-effective and stable non-noble electrocatalysts for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is now the critical issue for large-scale application of zinc-air batteries. Here, we presented a simple method to synthesize highly dispersed cobalt manganate spinel nanodots in-situ embedded in amine-functionalized carbon black. Silane coupling agent 3-aminopropyltriethoxysilane (APTES) played dual roles in the preparation: (1) to achieve amine-functionalization of carbon support; (2) as weak alkali to precipitate metal hydroxides which were then converted to spinel nanodots after mild calcination . The hydrophilicity of the carbon substrate was enhanced by amine modification from APTES to disperse metal oxide evenly, and the electrochemical activity was promoted through the strong interface interaction between embedded spinel nanodots and carbon substrate during the calcination process. As expected, the CoMn 2 O 4 /C-NH 2 -300 catalyst exhibited satisfactory bifunctional catalytic performance for both ORR and OER with an ΔE (E 1/2 -E j10 ) = 0.75 V, which was lower than most state-of-the-art catalysts. In addition, CoMn 2 O 4 /C-NH 2 -300 as a cathode also exhibited remarkable zinc-air battery performance in alkaline solution. This strategy of APTES as a bifunctional coupling agent provided a novel way to design and explore highly active, durable, and cost-effective catalysts for renewable energy conversion and storage.
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