Abstract

In the present study, production of bacterial cellulose nanofibers from single sugars and sugar mixtures in feedstock was investigated using different culture methods. This includes production in shake flask, stirred tank and draft tube airlift bioreactors. There has been no previous work done other than this reported work concerning production of bacterial cellulose nanofibers using sugar mixtures. Fructose was found to be the top producer with 5.65 g/L of bacterial cellulose nanofibers. The different compositions of sugar mixtures tested in this study were identical to acid hydrolyzates of agricultural residues. Maximum yield of 17.72 g/L was observed with mixture that resembles the acid hydrolyzate of wheat straw. Modified stirred tank and airlift bioreactors showed higher production of bacterial cellulose nanofibers compared to shake flask. In general, results obtained in the present study demonstrate potential of improving production of nanofibers solely based on agricultural residues and using draft tube airlift bioreactors.

Highlights

  • Cellulose is the world's most abundant biopolymer

  • 4.1 Effect of Different Feedstock on Bacterial Cellulose (BC) Production Production of BC nanofibers was investigated in shake flask using different feedstock of single sugars and sugar mixtures

  • Final pH (- 4.59) of fructose is closest to the optimum pH value of 5.0, and this would be the reason behind the higher production of BC nanofibers in fructose medium (Verschuren et al, 2000)

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Summary

Introduction

Cellulose is the world's most abundant biopolymer. Unlike the cellulose from wood pulp, BC does not contain lignin or hemicellulose. BC is a natural nanomaterial, which has a native dimension of less than 50nm in diameter. Cellulose fibers are relatively strong; have breaking strengths of up to 1 GN/m 2 (10,000 MPa). Its fiber has a high aspect ratio with a fiber diameter of100 nm. As a result, it has a very high surface area per unit mass. It has a very high surface area per unit mass This property along with its hydrophilic nature, results in very high liquid loading capacity. Due to its high production cost, it has not been widely utilized

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