Characterization, antioxidant, and sausage preservation effects of ethanol extract from lotus seed peel powder.

The ethanol extract from lotus seed peel powder (EEL) were characterized, and its antioxidant and sausage preservation effects were investigated in this study. Chemical composition, UV and FTIR spectra of EEL, 70% ethanol-soluble matter (70-DF), and precipitate (70-PF) showed similar trends to some extent, indicating their similar chemical composition. Then, their antioxidant potentials were confirmed that EEL exhibited stronger DPPH· scavenging capacity, FRAP, and lipid peroxidation inhibitory activities than those of 70-DF and 70-PF. Correlation analysis also indicated phenolics as the main antioxidant components of EEL. Hence, catechin, epicatechin, rutin, phlorizin, and gallic acid were identified as the dominant phenolics of EEL. Throughout the chopping, roasting, cooking and pasteurization processes, EEL could protect the color, maintain the pH value, and decline the total volatile base nitrogen (TVB-N) and thiobarbituric acid reactive substances (TBARS) values of sausages. Following 18 days of storage at 25 °C, supplementation with EEL reduced the TVB-N and TBARS values of sausages, while pH value showed an opposite trend. The present study found that EEL could prolong the shelf life of sausages via inhibiting the oxidation of lipids and proteins, which would promote the utilization of lotus seed peel powder as a substitute for nitrites to preserve meat products. [Display omitted] • UV and FTIR spectra of EEL, 70-DF, and 70-PF showed a similar trend to some extent. • EEL had stronger DPPH· scavenging, FRAP, and lipid peroxidation inhibition than 70-DF and 70-PF. • Catechin, epicatechin, rutin, phlorizin, and gallic acid were the dominant phenolics of EEL. • EEL could be used as a substitute for nitrites to preserve sausages during processing and storage. [ABSTRACT FROM AUTHOR]