The Evaluation Profile of Onion Peel Extract (Allium Cepa L.) on Scanning Electron Microscopy (SEM), Density, and Inhibitory Microbes as a Poultry Additive

This study aims to evaluate the scanning electron microscopy (SEM), density, and bacterial inhibition of onion peel as a potential poultry feed additive. The material used in this study was onion peel. Particle morphology was analyzed using a Scanning Electron Microscope (SEM) DEX tool with 10,000× magnification to observe particle structure and identify chemical elements. The density test was conducted to determine the volume occupied by particle mass. The bacterial inhibition test was carried out to identify the antimicrobial activity against E. coli, Salmonella sp. and lactic acid bacteria (LAB) around the wells. The results showed that the shape of the onion peel particles was irregular, resembling logs and lumps. The density of onion peel extract was (225 g/L). The inhibition test indicated that the solid extract of onion peel exhibited stronger antimicrobial activity compared to the solution or liquid extract. The inhibition zones of the solid extract were (10 mm) E. coli, (11.2 mm) Salmonella sp., and (7.1 mm) LAB. It can be concluded that onion peel flour has potential as a feed additive due to its digestible particle morphology (SEM), high particle density, and strong antimicrobial activity.