Unprocessed animal products and processed animal products were selected based on
following criteria; i) cases of research on natural preservatives, ii) food
items and raw materials with high consumption (MFDS, 2020 ), iii) fat content. For unprocessed animal products,
eggs, chicken breast, chicken legs, pork ribs, pork sirloin, beef ribs, beef
chuck, and milk samples were used. For processed animal products, processed
butter, fermented milk, ground meat product, natural cheese, and smoked egg
samples were used. These samples were purchased from local supermarkets and
butcher shops.