Effects of adding sodium nitrite and tea polyphenols on the characterizations and cytotoxicity of carbon nanoparticles from fried pork

Abstract

Carbon nanoparticles (CNPs) extensively present in thermal-processed foods. Sodium nitrite (NaNO2) and tea polyphenols (TP) are commonly used in meat processing, while the properties and cytotoxicity of CNPs existed in fried pork added NaNO2 and TP remain unknown. The results showed that compared with no addition (NA, 4.008 ± 0.43 nm) in soaked pork, the smaller diameters of CNPs (0.968 ± 0.44 nm) were found in CNPs-NaNO2-20 group (addition 20 mg/kg NaNO2), the larger (155.8 ± 7.30 nm) in CNPs-TP-100 group (addition 100 mg/kg TP). The diameter of CNPs was positively correlated with the added concentration. CNPs decreased the viability of HL-7702 cells. Compared with NA group, cell viability in CNPs-NaNO2-80 group was obviously (p < 0.05) decreased by 3.17%, while the CNPs-TP-200 group was 13.84% higher. CNPs could block cells growth by arresting cells in S-phase and increasing cellular ROS levels. CNPs generated in fired pork added 200 mg/kg TP in soaking showed less cytotoxicity.