International Journal of Scientific Research and Management (IJSRM) ||Volume||12||Issue||01||Pages||185-164||2024|| Website: https://ijsrm.net ISSN (e): 2321-3418 DOI: 10.18535/ijsrm/v12i01.ft02 Jajang Gumilar, IJSRM Volume 12 Issue 01 January 2024 FT-2024-158 Physical Quality of Edible Film from Duck Feet Gelatin Using Various Glycerol Concentrations Jajang Gumilar 1 *, Hana Aulia Andiati 2 , Eka Wulandari 1 1 Department of Animal Products Technology, Faculty of Animal Husbandry, Universitas Padjadjaran, Ir. Sukarno Road, Jatinangor, Sumedang 45363, Indonesia 2 Study Program of Animal Science, Faculty of Animal Husbandry, Universitas Padjadjaran, Ir. Sukarno Road, Jatinangor, Sumedang 45363, Indonesia. Abstract: Edible film is a type of packaging that can be consumed, can coat food products, and can be decomposed naturally (biodegradable). This research aims to assess the effect of applying glycerol on the physical quality of edible film from duck's feet gelatin. This research used a completely randomized design (CRD) followed by the Tukey test. The treatment was the use of 10% (T 1 ), 20% (T 2 ), 30% (T 3 ), 40% (T 4 ), and 50% (T 5 ) glycerol. The treatments were repeated three times. The findings indicated that the use of glycerol had a significant difference in the yield, thickness, tensile strength, and Young's modulus of edible film (P<0.05), but was not significantly different in the elongation of edible film (P>0.05). The optimal glycerol concentration for edible film in this study was obtained by using 10% glycerol. Keywords: Physical quality, edible film, duck feet, glycerol. Introduction The edible film is a thin sheet that functions as packaging for food products, is easily decomposed naturally (biodegradable), and is environmentally friendly. The mechanism for gel formation in protein-based edible films is that the protein is denatured by heating and endothermic polymerization occurs, followed by surface dehydration. The polymerization process involves disulfide molecules and hydrophobic bonds. The heating treatment causes a three-dimensional protein structure between sulfhydryl and hydrophobic groups, so the unfolded protein chains will approach each other and connect via disulfide and hydrophobic bonds. The protein denaturation process makes the protein chains open, thus allowing the formation of a new matrix network that is more compact and can interact with other components. The edible film is made from materials that are safe for health so that the packaging can be consumed together with the packaged food. Edible films are made from natural materials, such as polysaccharides, proteins, fats, or a combination of several materials (composites), with or without the addition of plasticizers such as glycerol, sorbitol, sucrose, and others (Cerqueira, et al., 2011). Gelatin is a hydrolysis product of collagen found in skin, bones, and meat. Gelatin, as one of the ingredients used to make edible films, is transparent, strong, flexible, and able to inhibit the transfer of oxygen and carbon dioxide (Gela, 2016). The benefits of gelatin for food products are as a thickener, stabilizer, emulsifier, binder, adhesive, and edible film packaging. Gelatin is made by hydrolyzing collagen from skin, bones, and animal flesh using acid or alkaline solutions. Animal skins that are widely used in making gelatin are pork skin and cow skin, but according to Islamic beliefs, pork skin is not halal or forbidden for consumption (Abdullah, et al., 2016). The contribution of gelatin from pork skin is 41%, beef bones 30%, cow skin 28.6%, and the rest from fish (Swaidatul, et al., 2016). Another alternative material that is halal to consume to make gelatin is by using by-products from livestock, such as duck feet. Duck feet can be used as raw material for making gelatin because they contain collagen in the skin, bones, and tissue. The collagen protein content in shank skin is more than 80% (Purnomo, 1992). Gelatin made from duck feet has advantages apart from its high collagen protein content, that it is easy to obtain and economically very cheap.