This study explored the effect of electrical stimulation (ES) and Pediococcus pentosaceus LL-07 ( P. pentosaceus LL-07) and Staphylococcus simulans QB7 ( S. simulans QB7) on the quality and microbial community of loin ham during the ripening. After the ES and starter culture treatments, the Aw and pH were decreased. Surface hydrophobicity, myogenic fiber fragmentation index (MFI), TCA-soluble peptide, amino nitrogen and free amino acids (FAAs) were also significantly higher than the control group (CK) ( P < 0.05). This increase was more significant in the E-S group (electrical stimulation followed by inoculation with P. pentosaceus LL-07 and S. simulans QB7) than the rest of the experimental group (E、S、S-E group). Furthermore, the CK and E-S groups were subjected to a bacterial community comparison experiment. The microbial diversity of these two groups was increased. Pediococcus spp. and Staphylococcus spp. became the dominant bacteria in E-S groups during the ripening. Correlation analyses show a strong correlation between protein hydrolysis, microorganisms and FAAs. In conclusion, the combination of ES and starter culture could promote protein hydrolysis, the accumulation of FAAS, and improves the bacterial community of loin ham.
Hong-jia Xiang,Jia-hui Liao,Yan-Tian Tang,Peng Wen,Hong Wang
To extend the shelf-life of chilled flesh foods, an antimicrobial packaging incorporated with cinnamon essential oil (CEO) was developed by emulsion electrospinning using polyvinyl alcohol (PVA) and zein. The CEO demonstrated an encapsulation efficiency and loading capacity of 87.42 % and 13.83 %, respectively. Electron microscopy and Fourier transform infrared spectra confirmed the successful encapsulation of CEO in the core part of nanofiber with a diameter on average of 976.12 nm. Furthermore, the results of antimicrobial studies showed that the inhibition zones of nano film against E. coli, S. aureus, P. fluorescens, and L. monocytogenes were 8.41, 26.77, 18.93, and 36.24 mm, respectively, and the non-contact inhibition rates were 100 %. Preservation studies revealed that the nano film could effectively extend shelf life of the pork loin and shrimp to 10 and 6 days, along with the released contents of CEO being 90.9 % and 80.4 %, respectively. Therefore, the nano film exhibits a potential application for the preservation of chilled flesh foods.
危险品化学品经营许可证（带存储）