MICROCHIMICA ACTA
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2022
·Vol. 189
·期 11
·1-10
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IF 6.408
Wang Xin,Li Longwen,Li Lihua,Bu Tong,Yang Kairong,Xia Junfang,Sun Xinyu,Jiang Hong,Wang Li
A novel ratiometric fluorescence probe was designed for the determination of Al 3+ by self-assembling of NH 2 -MIL-101(Fe) and [Ru(bpy) 3 ] 2+ . Under the excitation wavelength of 360 nm, the NH 2 -MIL-101(Fe)@[Ru(bpy) 3 ] 2+ presented a dual-emitting luminescent property at 440 and 605 nm, respectively. In the presence of Al 3+ , the blue fluorescence of NH 2 -MIL-101(Fe)@[Ru(bpy) 3 ] 2+ at 440 nm was enhanced remarkably, while the red emission at 605 nm was almost not influenced. Therefore, taking the fluorescence at 440 nm as the report signal and 605 nm as the reference signal, quantitative determination was achieved for Al 3+ concentration in the ranges 0.2–25 μM and 25–250 μM. The limit of detection (LOD) and limit of quantification (LOQ) were calculated to be 73 nM and 244 nM, respectively. The sensing mechanisms were studied by theoretical calculation and optical spectra. The analysis of real food samples confirmed the suitability of the proposed method. More importantly, portable fluorescent test papers were successfully manufactured to provide a strategy for visual, rapid, and on-site detection of Al 3+ . Graphical abstract
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Senyang Song,Xiaoyan Ma,Wenyue Li,Boyuan Zhang,Bo Shao,Xiaoyu Chang,Xiaoju Liu
With the development of power supplies for wearable devices , electrode materials with dual functions have received extensive attention. Herein, we report a strategy of preparing stylophora coral-like Ni/Co bimetal metal organic framework (MOF) with furan-based derivatives as ligands through the simple solvothermal method, which can be utilized as a dual-function electrode material to build supercapacitors and non-enzymatic glucose sensing. It can be found that the high molecular stacking properties of the rigid furan ring skeleton combined with the unique stylophora coral-like morphology can greatly improve the charge transfer efficiency of the electrode reaction process, and the structure of the bimetallic node can effectively adjust the three-dimensional electronic structure, making high capacitive performance during charge storage. The specific capacitance of the furan-based bimetallic MOF material is as high as 531 C g −1 at a current density of 1 A g −1 with a high capacitance retention rate of 83.4% after 5000 cycles. In addition, the glucose sensing performance is analyzed and an outstanding sensitivity value of 366 µA mM −1 cm −2 is achieved with a low limit of detection (2 μM). The as-synthesized furan-based bimetallic MOF material is a promising candidate for electrochemical supercapacitors and efficient glucose detection.
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FOOD CHEMISTRY
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2022
·
IF 9.231
Yaqin Wang,Lingjia Fan,Jintao Huang,Jingjing Liang,Xingnan Wang,Yichen Ren,Hongcai Li,Tianli Yue,Zhenpeng Gao
To prepare pumpkin juice (PJ) rich in coenzyme Q10, this study analyzed the chemical composition, antioxidant activity, and gut microbiota of pumpkin juice fermented by Rhodobacter sphaeroides (RPJ). The number of viable bacteria in the juice reached 2.8 × 10 8 CFU/mL; the fermentation process mainly consumed glucose and sucrose; the total sugar content was reduced, β -carotene was reduced, and a new antioxidant substance, coenzyme Q10, appeared at a content of 12.345 mg/L; levels of volatile alcohols, esters, and ketones significantly increased; and antioxidation ability improved, particularly the ferric ion reducing antioxidant power activity. The gut microbiota of mice shifted by increasing Lactobacillus and Bifidobacterium and protected the gut barrier by reducing Proteobacteria after 48 h of fermentation. Pumpkin juice fermented by Rhodobacter sphaeroides not only produces bioactive substances with antioxidant capacity but can also regulate the gut microbiota of mice.
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Food Science and Human Wellness
·
2022
·
IF 8.022
Juanjuan Tian,Xiaomeng Wang,Xueliang Zhang,Xiaohong Chen,Mingsheng Dong,Xin Rui,Qiuqin Zhang,Mei Jiang,Wei Li
In this study, the in vitro digestion and fermentation of two intra-polysaccharide fractions (IPS1 and IPS2) from Paecilomyces cicadae TJJ1213 were investigated. The constituent monosaccharides of IPS1 and IPS2 were not changed after simulated saliva, gastric and small intestinal digestion. However, they can be hydrolyzed and utilized by gut microbiota, and short-chain fatty acids (SCFAs) level were increased after IPS1and IPS2 treatments. Furthermore, 16S rRNA sequencing analysis of fermentation samples were performed. Alpha-diversity, beta-diversity and taxonomic composition differences analysis revealed that IPS1 and IPS2 promoted the proliferation of beneficial bacteria and modulated the overall structure of gut microbiota. Taxonomic comparison analysis found that IPS1 increased the relative abundances of beneficial bacteria including Megamonas , Bifidobacterium and Lactobacillus , while IPS2 could increase the abundance of Bacteroides , Parabacteroides and Phascolarctobacterium. In addition, they can also decrease the levels of pathogenic bacteria containing Escherichia-Shigella , Klebsiella and Fusobacterium . These results indicated that IPS from P. cicadae TJJ1213 could be used as potential candidates for new functional foods.
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MICROCHEMICAL JOURNAL
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2022
·
IF 5.304
Hao Sun,Weiyun Guo,Yaru Han,Zhifei Gou,Yanmin Liang,Jie Dan,Yi Kang,Jianlong Wang,Wentao Zhang
Drawing on the structure of the natural horseradish peroxidase (HRP) active site, in this study, food-borne Melanoidin and Fe 3+ were used to construct a peroxide mimic enzyme, which possessed excellent peroxidase (POD)-like activity with the Km values of 0.088 mM and 0.358 mM toward 3,3′,5,5′-tetramethylbenzidine (TMB) and hydrogen peroxide (H 2 O 2 ), respectively. Given the good POD-like activity of Melanoidin/Fe 3+ , a convenient, selective, and sensitive method for the determination of ascorbic acid (AA) was defined. The method covered the 10–100 μM AA concentration range with a 1.19 μM detection limit. With favorable anti-interference and strong stability, Melanoidin/Fe 3+ was successfully applied to the determination of AA in foods and medicines. The high activity of Melanoidin/Fe 3+ provides a new strategy for designing high-performance nanozymes, which has great potential in exogenous dietary and healthcare applications.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2022
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IF 4.831
Guo-Qi Zhang,Wei-Wu,Yu-Han Shi,Yang Zhao,Zhi-Hong Xu
Total antioxidant capacity (TAC) is an important indicator for evaluating oxidative stress of the human body. Since TAC is related to the concentration of reducing substances, it can be detected by using peroxidase-like or oxidase-like activity of nanozyme materials. In this work, the cobalt and nitrogen co-doped carbon dots (Co/N-CDs) are fabricated for building stability and high peroxidase-like nanozyme through the Box-Behnken design of response surface methodology. The morphology and luminescence properties of obtained Co/N-CDs were characterized by TEM and fluorophotometer, respectively. Interestingly, the surface charge of Co/N-CDs are innovatively investigated by a simple and widespread gel electrophoresis, which holds the potential to be an alternative to Zeta potential analysis. In addition, a flow injection spectrophotometric assay to detect ascorbic acid is develop with a high sensitivity and automation based on a Co/N-CDs/guaiacol/H 2 O 2 catalytic reaction system. The proposed method is also responsive to other reducing substances such as cysteine and glutathione. Therefore, the presented sensor can realize the determination of TAC, and then, some actual human serum samples are detected accurately and quickly (the recovery rates are 93.46–105.61 %).
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JOURNAL OF THE INDIAN CHEMICAL SOCIETY
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2022
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IF 0.243
Haijian Liu,Zhenxiang Li,Wei Zhang,Ying Liu,Rongkai Pan,Guofu Huang
Carbon nanodots (CDs) with superior fluorescence performance were obtained by hydrothermal method using tomatoes as raw materials. When the ultraviolet absorption band of tartrazine and the fluorescence spectrum of CDs have complementary overlaps, the fluorescent internal filter effect (IFE) occurred. Furthermore, the degree of quenching of fluorescence intensity of CDs has an excellent linear correlation with tartrazine concentration. And based on this principle, a method for detecting tartrazine was established. As the decrease of fluorescence intensity, tartrazine can be measured in the linear range of 0.1 μM–40 μM. The detection limit is 39 nM, and the recovery rate is 90.7%∼114.5%. The established protocol was also effectively employed to assay tartrazine in beverage samples, indicating that it has great potential for food color analysis.
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Foods
·
2022
·Vol. 11
·期 21
·3388
·
IF 5.561
Xijuan Tu,Yunmin Tao,Jiaxu Chen,Chunping Du,Qian Jin,Yuchang He,Ji Yang,Shaokang Huang,Wenbin Chen
In the present study, a lanthanide fluorescence sensor array was developed for the discrimination of honey’s botanical origin. Dipicolinic acid (DPA) was used as the antenna ligand for sensitizing the fluorescence of Tb3+and Eu3+to prepare the DPA-Tb3+/Eu3+complex. This lanthanide fluorescence sensor showed a cross-reactive response to the major constituents of honey, which led to the result that different classes of honey solution exhibited distinct quenching effects on the fluorescence of the DPA-Tb3+/Eu3+complex. Furthermore, a fluorescence sensor array composed of ten sensors was constructed by adjusting the pH and the component of the DPA-Tb3+/Eu3+complex to show multivariate responses towards honey. The visual fluorescence image of the sensor array was recorded by using a smartphone under excitation with portable UV lamp. Results indicated that the pattern of the visual image was related with the botanical origin. After extracting the RGB value of each sensor in 96-well plate, the ratio of R/G was used for principal component analysis (PCA). The results showed that three classes of honey (astragalus, logan, and litchi) were well distinguished. Moreover, the value of principal component 1 (PC1) showed good linearity with the composition of mixing honey and could be used for semi-quantitative analysis. The proposed lanthanide fluorescence sensor array presents a visual and portable method for the discrimination of a honey’s origin without the use of analytical instruments, and might provide a novel and simple strategy for the measurement of food origin.Keywords:honey;botanical origin;lanthanide complex;fluorescence;sensor array
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JOURNAL OF CHROMATOGRAPHY A
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2022
·
IF 4.601
Yang-Ye Zhou,Jia-Ping Chen,Lu Gan,Wen Xu,Yu Liu,Yong-Gang Zhao,Yan Zhu
An analytical method for the detection of glucose in human exhaled breath by non-invasive condensation collection coupled with ion chromatography was developed. A self-designed exhaled breath condensation device was constructed, through which human exhaled breath was condensed and collected. And the glucose in collected human exhaled breath condensate (EBC) was analyzed by ion chromatography with a pulsed amperometric instrument. The standard EBC collection method was established, and the key factors such as cooling temperature and sampling flow rate during condensation collection were investigated deeply, and a good linear correlation between blood glucose levels and exhaled breath glucose levels was obtained. The intra-day precision was 3.37%, and the inter-day precision was 3.83%. Furthermore, EBC from healthy people and diabetic patients was collected in fasting state and after meal. We found the breath glucose level in healthy volunteers was 0.11–2.34 ng/L and that in diabetic patients was 0.23–135.92 ng/L. In after meal samples, the breath glucose level is 10–100 times higher than that of healthy subjects, which offering the prospect of a non-invasive approach to the monitoring of diabetes.
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Journal of Materials Research and Technology-JMR&T
·
2022
·
IF 6.267
Tongle Gao,Ting-Ting Li,Xilin Liao,Jia-Horng Lin,Bing-Chiuan Shiu,Ching-Wen Lou
Photoelectrodes constructed with photoactive materials are of great significance for the performance of photoelectrochemical (PEC) sensors. In this study, a facile and efficacious non-enzymatic glucose sensor based on the Cu 2 O/TiO 2 heterojunction was successfully constructed for quantitative determination of glucose concentration. The Cu 2 O/TiO 2 heterojunction was generated by first obtaining TiO 2 nanofibers via electrostatic spinning and high-temperature calcination, and then synthesizing Cu 2 O nanoparticles via a one-step hydrothermal reaction. By introducing the narrow band gap semiconductor Cu 2 O, the defect that pure TiO 2 could not absorb visible light was improved, resulting in the improved photoelectrochemical performance of the composite material compared to the single component semiconductor. The sensor exhibited favorable PEC non-enzymatic glucose sensing performance under simulated sunlight irradiation with a wide linear response range from 1 mM to 14 mM (R 2 = 0.9991) and a low detection limit of 14.4 μM (S/N = 3), along with good selectivity, stability and reproducibility. This also provided more ideas and possibilities for preparing photoelectrode materials by constructing heterojunctions.
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FUEL
·
2022
·
IF 8.035
Yueqing Wang,Hongxing Wang,Junbo Zhang,Hongyan Zheng,Long Huang,Yulei Zhu
Selectively converting fructose into furfural by H-beta catalyst is a very interesting catalytic process. However, it is a challenging task to clearly elucidate the roles of framework Al for selective scission of C C and C O bond. Herein, selective elimination of framework Al atoms is realized. Several detailed investigations showed that the framework Al species located in different sites play important role in furfural formation. The framework Al atoms of pristine H-beta mainly occupied at T1, T2, T5, T6 and T7 sites. These Al species at pore mouth can be removed by citric acid, while the treatment of nitric acid mainly eliminated the framework Al atoms from T2 and T7 sites. As for oxalic acid, the Al atoms occupied at T2, T5, T6 and T7 was primarily leached. Upon citric acid and nitric acid treatment afforded the similar yield of furfural, indicating that the formation of furfural could not be governed by these Al species at pore mouth, T2 and T7 sites. However, in the case of oxalic acid treatment, complete removal of the Al species on T2, T5, T6 and T7 sites decreased the yield of furfural. Thus, it is reasonably inferred that these Al atoms populated at T1 sites and intersecting channels is more encouraging for the splitting of C C bond, while the Al species occupied at T5, T6 sites and the larger straight channels is probably more favorable to scission of C O bond.
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APPLIED CATALYSIS A-GENERAL
·
2022
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IF 5.723
Qin Wang,Dan Luo,Jiansu Ran,Jie Zheng,Yuntong Cui,Ruixue Yangcheng,Shuang Luo,Jianjian Wang
It is highly desirable but of challenge to develop an efficient process for lactic acid (LaA) production from xylose performed in water. Herein, a novel catalyst prepared via a facile solvent-free coordination route is developed to efficiently produce LaA from xylose in water. The structural properties of the prepared catalyst and the reaction conditions are systematically investigated. The production rate of LaA at 190 °C in water is up to 1.8 h −1 , outperforming the most recent reports (below 1.1 h −1 ). Detailed experimental and characteristic studies reveal that the presence of Lewis acidic sites and basic sites in the catalyst structure can not only lower the energy barrier of xylose conversion but also boost the efficient conversion of the active reaction intermediates into LaA. The findings of this work will provide a new approach for the efficient production of LaA from carbohydrates.
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