FOOD CHEMISTRY
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2013
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IF 3.334
Yunzi Feng,Yu Cai,Guowan Su,Haifeng Zhao,Chenxia Wang,Mouming Zhao
Two types of Chinese soy sauce , high-salt liquid-state fermentation soy sauce (HLFSS) and low-salt solid-state fermentation soy sauce (LSFSS), were used to investigate their differences in aroma profile by headspace solid-phase microextraction (HS-SPME) and gas chromatography-olfactometry/mass spectrometry (GC-O/MS). Results from descriptive sensory analysis showed that the alcoholic, cooked potato-like and caramel-like attributes were significantly higher in HLFSS, while LSFSS exhibited significantly higher sour and burnt attributes. In addition, aroma extract dilution analysis (AEDA) revealed 37 and 33 odour-active regions for HLFSS and LSFSS, respectively. Ethanol, 3-methyl-1-butanol, phenylacetaldehyde , 4-ethyl-2-methoxyphenol, 2-methoxy-4-vinylphenol and 3-(methylthio)propanal detected in HLFSS showed the highest flavour dilution (FD) factors, while 3-methylbutanal, phenylacetaldehyde and ethyl propanoate possessed the highest FD factors in LSFSS. Therefore, the traditional Chinese soy sauce HLFSS contained more complex volatiles and exhibited a richer aromatic profile compared with LSFSS.
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FOOD CHEMISTRY
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2014
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IF 3.259
Yunzi Feng,Guowan Su,Haifeng Zhao,Yu Cai,Chun Cui,Dongxiao Sun-Waterhouse,Mouming Zhao
Twenty-seven commercial soy sauces produced through three different fermentation processes (high-salt liquid-state fermentation soy sauce, HLFSS; low-salt solid-state fermentation soy sauce, LSFSS; Koikuchi soy sauce, KSS) were examined to identify the aroma compounds and the effect of fermentation process on the flavour of the soy sauce was investigated. Results showed that 129 volatiles were identified, of which 41 aroma-active components were quantified. The types of odorants occurring in the three soy sauce groups were similar, although their intensities significantly differed. Many esters and phenols were found at relatively high intensities in KSS, whereas some volatile acids only occurred in LSFSS. Furthermore, 23 aroma compounds had average OAVs > 1, among which 3-methylbutanal, ethyl acetate, 4-hydroxy-2-ethyl-5-methyl-3(2 H )-furanone, 2-methylbutanal and 3-(methylthio)propanal exhibited the highest average OAVs (>100). In addition, omission tests verified the important contribution of the products resulting from amino acid catabolism to the characteristic aroma of soy sauce.
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TETRAHEDRON
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2016
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IF 2.645
Yufei Wu,Jie Hou,Yuliang Liu,Mingfu Zhang,Chen-Ho Tung,Yifeng Wang
The highly efficient and chemoselective α,α′-bis-substitution of alkanones is important in organic synthesis. Herein, a dimeric titanium cluster, Ti 2 Cl 2 (OPr i ) 6 ·2HOPr i ( Ti 2 ), is used in the Claisen–Schmidt condensation reaction, for the selectively activation of symmetrical ketones containing α,α′-methylene groups and production of α,α′-bis-substituted alkanones in high efficiency and chemoselectivity. The high efficiency and chemoselectivity can be extended to a variety of typical alkanones and aromatic aldehydes . Both of the oxo-bridged dimeric motif of Ti 2 and the ionic Ti–Cl bond are responsible for the high efficiency and chemoselectivity.
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Polymer Chemistry
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2024
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IF 4.1
Hong-Hui Shu,Yun Liu,Sheng-Li Han,Xiuqin Fang,Chang Wang,Cheng-Mei Liu
Biomass-based polyamides (bioPAs) are renewable materials that are viable alternatives to petroleum-based polyamides in the engineering field. However, the attention to designing functional bioPAs with tunable properties has been limited. Herein, by taking furfurylamine as the sole furan source, we first utilized amine-acid oxidative coversion to prepare bisfuranic diacid monomer directly from bisfuranic diamine monomer(amine-first strtegy), it was totally different to castor oil-based acid-first strategy of preparing PA1010. Then the as-prepared multifunctional diamine/diacid monomers underwent polycondensation to obtain all-furan based bioPAs with or without functinal pendant groups. The properties of bioPAs, incuding glass transition temperatue, degradation character, solubility, etc, can be regulated over a larger range through the design of the spacer structure between two furan rings on diamine monomers. Charged bioPAs with cationic or anionic groups were further developed by postpolymerization modification. The oppositely charged bioPAs, sharing an identical main chain structure but different pendent groups, formed porous polyelectrolyte complexes owing to their rigid main chain. Therefore, this research provides a novel strategy for preparing both functional and engineering furan-based bioPAs.
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TALANTA
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2024
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IF 5.6
Mengmeng Ji,Yi Chen,Yufei Hu,Gongke Li
The origin of coffee beans impacts the aroma, flavor, and consumer acceptance, resulting from volatile organic compounds (VOCs) such as ketones, aldehydes, alcohols, pyrazine, and esters. Among them, ketones are associated with the refreshing fruity flavor of coffee beans and can serve as key substances for identifying their origin. Herein, the novel method of cyclic cataluminescence (CCTL) was presented and proven to be feasible for differentiating the origins of coffee beans based on the ketones-involved multiple cataluminescence reactions. A series of exponential decay CCTL peaks were measured through nano Al 2 O 3 -catalyzed reactions. By fitting the variation of peak intensity I n with time t , the characteristic attenuation coefficient k was calculated, which can be used to successfully distinguish the origin of the selected coffee beans in combination with chemometrics. The method was validated in the tests of 82 coffee beans. Coffee from the same origin has similar k values, while coffee from different origins has different k values. The discrimination accuracy of linear discriminant analysis and hierarchical clustering analysis was 100 %. The established method was fast. We anticipate that the technique could also serve as a promising new tool for reliably, effectively, and swiftly identifying the origins of other plant products.
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Analytical Methods
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2024
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IF 2.7
Yuxin Wang,Hengyi Xu,Bo Sui,Hui Xi,Yingjie Fu,Wuduo Zhao,Peng Li,Shihao Sun,Dingzhong Wang,Jianxun Zhang
Development of combined mass spectrometry ionization sources has enabled expansion of the application and scope of mass spectrometry. A novel hybrid ionization system combining vacuum ultraviolet (VUV) and atmospheric pressure chemical ionization (APCI) was constructed. Gaseous samples were self-aspirated into an ionization zone through a capillary by negative pressure, generated by high-speed airflow based on the Venturi effect. Compared with APCI mode alone, the signal-to-noise ratio (S/N) in APCI/VUV mode was increased by about 276-times. To increase the ionization efficiency further, correlated experimental conditions were optimized. Four types of volatile organic compounds (VOCs) were tested to evaluate the performance of the APCI/VUV ion source. Excellent linearity and limit of detection were achieved for compounds in mixed solutions. Quantitative analyses of four VOCs (toluene, cyclohexanone, styrene and ethylbenzene) using APCI/VUV-MS were done, and the relative standard deviations (RSDs) were 1.57%, 6.30%, 4.49% and 8.21%, respectively, indicating that the APCI/VUV ionization source had excellent reproducibility. Our results demonstrated that the developed method was promising for analyzing VOCs as well as being rapid, simple, and easy to operate.
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Engineering
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2025
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IF 11.6
Qingrui Zeng,Ziang Jia,Yingyang Song,Yiwen Fan,Xu Liu,Jinping Cheng
Carbon dioxide capture and storage (CCS) is an important technological path for realizing “carbon neutrality,” where carbon capture is one of the three key CCS technologies. At present, mature carbon capture technologies still have technical shortcomings and difficulties, such as low capture efficiency and high energy consumption, which limit their large-scale popularization and application. In this study, a solid–liquid phase change absorbent (PCA) system with isophorone diamine (IPDA) as the only carbon dioxide (CO 2 ) capture carrier and ketone-based organic molecules as the phase change medium was developed. The solid–liquid PCA system has a wide range of applicability, with highly efficient CO 2 capture (1.11 mol·mol −1 ) at concentrations ranging from typical values in air to those in coal-fired industrial emissions (400 to 150 000 ppm) and low-energy consumption regeneration, as revealed by a two-phase integrated engineering model. The CO 2 absorption product IPDA(NHCOO − ) 2 was characterized by materials science analysis, molecular dynamics (MD) calculations and quantum chemistry. The results indicate that in noncyclic ketone-based phase-change media, the hydrogen bonding in IPDA(NHCOO − ) 2 is modulated by noncovalent bond interaction (NCI) forces to form a small-scale hydrogen-bonding network. These properties ensure that the product can be easily regenerated by low-temperature thermal treatment (333 K, 60 °C), and characterization and calculations revealed a reaction mechanism different from that of the aqueous system. The technoeconomic evaluation (TEA) results show that this type of ketone-based PCA has an obvious low-cost advantage over traditional carbon capture technologies. This study provides a new perspective on the application and practical feasibility of PCAs for direct air capture of carbon dioxide.
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ANALYTICAL CHEMISTRY
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2025
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IF 6.7
Jiyao Wang,Ruina Zhang,Shihao Li,Binghang Du,Xiaohao Wang,Kai Ni
In Ion Mobility Spectrometry (IMS), ion gates are essential for controlling ion flow, significantly impacting detection sensitivity and resolution. Despite various optimization methods, a clear approach is needed to define the performance limits of ion gates. This study proposes a linear relationship between peak intensity (Ip) and resolving power (Rp) at low ion quantities, introducing it as a reference for evaluating the optimization level. The Tri-State gate (TSG) enables the accurate study of this Ip–Rp relationship, but ion leakage of TSG disrupts control over narrow ion swarms, thereby limiting Rp. After the causes of ion leakage were examined, a preshaping method that removes the gate-opening phase was proposed to precisely control ion injection. This method leverages ion leakage to improve Rp while ensuring the linearity between Ip and Rp. The preserved linearity means avoiding excessive ion loss and shape distortion, ultimately leading to optimal resolving power. Simulations and experiments demonstrate that precise voltage adjustments effectively minimize ion leakage, enhancing resolving power by 50% (reaching a maximum of 106), while the corresponding decrease in signal intensity follows the Ip–Rp linear relationship. This approach expands the accessible range of Ip–Rp combinations without altering their fundamental relationship, reduces discrimination, and establishes a new evaluation method for optimizing ion gate performance in IMS.
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