The Effect of Chemical Pretreatment Process on Mechanical Properties and Porosity of Cellulose Bacterial Film

Abstract

Bacterial cellulose (BC) is a natural polymer which have superior properties, like high porosity, high purity, and high permeability. The study objective is to determine the influence of chemical pretreatment on tensile strength and the porosity of BC. The method was to make BC films from pineapple peel extract through fermentation process for 14 days. The pretreatment was conducted by immersion of BC in BmimCl, H2O2, and NaOH solution with a concentration of 2.5%; 5%; and 7.5 %, heated at 80 °C then dried in the oven, and the samples were then tested by a tensile test using ASTM-D636-V standard, morphology analysis using Scanning Electron Microscope, and porosity analysis. The results indicate that the tensile strength of control sample was 123 MPa, whereas after chemical pretreatment, the tensile strength was decreased with the greater reduction occurred using NaOH pretreatment compared than the other solutions that having a lower tensile strength of 8.54 MPa at 7.5 % of NaOH. The results of porosity show that the value increased after being treated chemically. The BC film porosity was 87.13% after NaOH treatment of 7.5% while BC film untreated had porosity of 19.15%. This phenomenon was occurred due to the increasing pore, so the absorption of water increased.

Development of Bacterial Cellulose Herbal Wound Dressing

“…After this time, bacterial cellulose films were formed in the air/liquid medium interface. The films were treated with 0.3 M NaOH at 80 °C for 2 h to remove bacterial cells, remains of the culture medium and treated with distilled water to pH 7 [11]. It was hydrolyzed by 0.1 M H2SO4 in a ratio of 1:20 g/mL with continuous stirring for 1 h at 85 °C followed by the oxidation of H2O2 to obtain the bacterial cellulose nanocrystal (BCNC) [12].…”

Review: Produksi, Karakterisasi Dan Aplikasi Selulosa Bakteri Di Bidang Farmasi

“…Hal ini dikarenakan komponen seluler pada bakteri mengalami kerusakan sehingga terjadi pembentukan sel mutan. Selain itu proses fermentasi yang tidak dilakukan pada suhu optimum dapat mengakibatkan terganggunya stabilitas kimia dan mekanik membran selulosa yang dihasilkan yang disebabkan oleh rendahnya ikatan hidrogen dan ikatan glikosida yang terbentuk (Sutrisno et al, 2019).…”

“…Konsentrasi NaOH yang digunakan melebihi 5% maka mengakibatkan permukaan membran selulosa bakteri menjadi kasar dan kuat tarik menurun. Penurunan terjadi karena konsentrasi NaOH yang tinggi dapat mengikis atau melarutkan serat selulosa sehingga ikatan hidrogen yang terdapat pada struktur jaringan serat menjadi lemah (Sutrisno et al, 2019). Selain penggunaan pelarut alkali NaOH, metode pengeringan juga sangat berpengaruh terhadap karakteristik selulosa yang dihasilkan.…”

Friction and Wear Characteristics of Bacterial Cellulose Modified by Microcellular Foaming Process

“…Also, in common sense, it is a biocompatible polymer used to replace a body damaged by disease or accident, and various materials such as metals, ceramics, and composites are currently used. In particular, polymer materials that can be easily modified chemically or physically and can be used in various forms, such as tubes, films, and fibers, are most often used [7].…”