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In order to explore the effect of substituting Chinese baijiu with brandy on the quality of traditional air-dried sausages, sausage samples were formulated with mixtures of mulberry brandy and baijiu in different proportions, and the amount of alcohol added to the sausages was 0.03 mL/g. Air-dried sausages were evaluated for volatile components, biogenic amine content, thiobarbituric acid reactive substances (TBARS) content, total volatile basic nitrogen (TVB-N) content and sensory evaluation after air-drying and ripening. In total 63 volatile components were detected in the samples by headspace-solid phase microextraction coupled with gas chromatography-mass spectrometry (HS-SPME-GC-MS) , and 45 known volatile components were detected by headspace-gas chromatography-ion mobility spectrometry (HS-GC-IMS). Benzaldehyde, decyl aldehyde, ethyl acetate, ethyl octanoate, ethyl phenylacetate, ethyl nonanoate and isoamyl acetate were found to be the major typical flavor components in the sausages with brandy. The flavor and overall acceptability of the sausage with complete replacement of baijiu by brandy were best. The TBARS value and TVB-N value were 0.92 mg/kg and 7.15 mg/100 g, respectively, which were significantly lower than those of the control and liquor groups (P 0.05). Overall, mulberry brandy imparts a distinct flavor to air-dried sausage, inhibits oxidative deterioration and accumulation of biogenic amines, and improves its quality.

The present study discusses the core-shell structures of Au@Ag prepared by a seed-growth method. The morphology and composition of Au@Ag nanoparticles were analyzed, indicating that they were successfully prepared. By studying the surface-enhanced Raman scattering spectra (SERS) of p -mercaptoaniline (PATP) molecules adsorbed on Au@Ag substrates, it was found that PATP molecules could be oxidized to form p -mercaptoazobenzene (DMAB) on Au@Ag substrates, indicating that the gold-silver bimetallic nanomaterials could catalyze the PATP molecules with excellent enhancement effect and stability. In order to further study the enhancement effect of the Au@Ag substrate, the electric field strength of Au nanoparticles and Au@Ag nanoparticles was simulated by using the finite difference time domain (FDTD) method, which showed that the SERS enhancement effect of Au@Ag nanoparticles was more significant as well as consistent with the experimental results. This work provides a reference for further preparation of efficient and stable bimetallic SERS substrates.

Introduction: The long-term overuse of malachite green (MG) has potential carcinogenic, teratogenic, and mutagenic effects. The functional nanocomposite is novel and challenging to construct and implement through surface enhanced Raman scattering (SERS) strategy to reveal the contributions in application., Objectives: The novel Ag-CDs (carbon dots)-PBA (phenyl boric acid) nanocomposite was constructed by a facile route to detect toxic MG molecule with high SERS sensitivity and good uniformity., Methods: The enhanced substrate used for the detection of MG has been successfully constructed using PBA modulated Ag-CDs on a structured surface with rich binding sites., Results: The fabricated Ag-CDs-PBA substrate can be used to analyze various probe molecules exhibiting high sensitivity, good signal reproducibility, and excellent stability. The mechanism between components has been proved by calculations originating from the plasmonic Ag and active electronic transmission among the bridging CDs and PBA via the close spatial π-π effect. In addition, the accelerated separation of electron-hole pairs was triggered to further improve the SERS activity of the hybrid via a bidirectional charge transfer (CT) process. Significantly, the Ag-CDs-PBA system shows distinctive selectivity, in which PBA can hinder the interference of other species without specific hydroxyl groups., Conclusion: Based on this deeper insight on plasmon-mediated mechanism, the SERS substrate was successfully practiced for quantitative determination in real water and fish samples. The strategy developed promises to be a new sensor technology and has great potential for environmental and food safety applications., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2023. Production and hosting by Elsevier B.V.)