FTIR analysis of alkali treatment on bacterial cellulose films obtained from pineapple peel juice
Heru Suryanto, Aminnudin Aminnudin, Mahsuli, Husni Wahyu Wijaya, Uun Yanuhar
Abstract
Abstract This study aimed to identify the functional group of bacterial cellulose films (BCF) treated by alkali (NaOH) solution. The research methods were BCF production using medium culture based on pineapple peel juice. The resulted pellicle was immersed in the alkali of 0%, 1%, 5%, and 10%. Pellicle was dried in the oven to obtain BCF. Functional group of the sample was recorded by an FTIR instrument. BCF surface was observed by scanning electron microscopy. The result shows that structure of BCF contains cellulose I and cellulose II. The functional group of BCF before and after the treatment were at wave number 3400 cm −1 , 2900 cm −1 , 2133 cm −1 , 1635 cm −1 , 1373 cm −1 , 1067 cm −1 . Alkali treatment caused the peak band at 2135 cm −1 to be reduced due to the breaking of the triple bond of alkynes.