Pengaruh Penambahan Partikel Arang Aktif terhadap Sifat Fisikokimia dan Antibakteri Film Komposit Kitosan/Lidah Buaya

Abstract

Edible film kitosan potensial sebagai pengemas makanan dengan sifat antibakteri alami yang aman dan ramah lingkungan. Film kitosan murni sensitif terhadap kelembapan. Gel lidah buaya dan arang aktif dari limbah ampas kopi dimanfaatkan untuk perbaikan sifat film. Penelitian bertujuan mengetahui pengaruh penambahan arang aktif terhadap sifat fisikokimia dan antibakteri film komposit kitosan/lidah buaya. Metode sintesis film yaitu solution casting. Film dievalusi dengan Fourier Transform Infra Red FTIR dan Field Emission Scanning Electron Microscopy FESEM, uji sifat mekanis, Water Vapour Transmission Rate WVTR, kelarutan dalam air, biodegradasi, dan antibakteri. Penambahan arang aktif menurunkan nilai WVTR dan kelarutan film dalam air. Nilai WVTR 2,1 g/m2.jam-2,6 g/m2.jam. Nilai kelarutan dalam air 8,563%-34,981%. Waktu biodegradasi sempurna yaitu 7-17 hari. Penambahan arang aktif meningkatkan kemampuan antibakteri film kitosan, sedangkan sifat mekanis film menurun. Morfologi permukaan film yang kasar dan berpori akibat penambahan arang aktif. Gugus fungsi yang terkandung adalah O-H, N-H, C-H, dan C=O dari kitosan, C-O-C sakarida kitosan/lidah buaya, serta Si-O-Si khas arang aktif/silika

Chitosan edible films have the potential to be used as food packaging since their natural antibacterial properties, safe and environmentally friendly. Moisture is a problem for pure chitosan film. To enhance the film's properties, aloe vera gel and activated charcoal from coffee grounds were added. The aim of research was to determine the influence of activated charcoal on physicochemical and antibacterial properties of chitosan/aloe vera composite films. The film synthesis method is solution casting. The addition of activated charcoal decreased the WVTR value and the water-solubility of the film. The WVTR value 2.1 g/m2.hr-2.6 g/m2.hr and 8.563%-34.981% for water-solubility. The addition of activated charcoal increased the antibacterial capacity of the chitosan film, while the mechanical properties decreased. The complete degradability time for films is 7-17 days. The surface morphology of the film is rough and porous due to the addition of activated charcoal. The functional groups contained are O-H, N-H, C-H, C=O from chitosan, C-O-C chitosan/aloe vera saccharides, and Si-O-Si typically activated charcoal/silica