Inhibition effect of non-contact biocontrol bacteria and plant essential oil mixture on the generation of N-nitrosamines in deli meat during storage

To reduce the risk of N-nitrosamines in deli meat products, this study formulated a novel non-contact N-nitrosamines inhibiting preservative IV (NIP-IV) consisting of biocontrol bacteria and plant essential oils (EOs) (Stenotrophomonas rhizophila SR-1 + Paenibacillus provencensis PP-2 + Bacillus subtilis CF-3+ cinnamon EO + grapefruit EO). Luncheon pork, spiced beef, and red sausage were taken as representatives of typical deli meat products and used to validate the effectiveness of NIP-IV in inhibiting N-nitroso dimethylamine (NDMA) production. The results showed that NIP-IV restrain protein degradation and lipid oxidation in deli meat products and effectively control microbial activity. Biogenic amines, such as phenethylamine, spermidine, cadaverine, and tyramine, were reduced. The conversion of nitrite to NDMA in deli meats was effectively inhibited by NIP-IV. Volatile organic compounds were the key to excellent NIP-IV non-contact preservation. Butyric acid, 3-methylbutanoic acid, benzaldehyde, d-limonene, and (E)-cinnamaldehyde were significantly negatively correlated with NDMA in deli meat products.