Comprehensive Characterisation of the Morphological, Thermal and Kinetic Degradation Properties of Gluconacetobacter xylinus synthesised Bacterial Nanocellulose

2021 ◽  
pp. 1-14
Author(s):  
Bemgba B. Nyakuma ◽  
Syieluing Wong ◽  
Laura N. Utume ◽  
Tuan Amran T. Abdullah ◽  
Mustapha Abba ◽  
...  
2016 ◽  
Vol 16 (4) ◽  
pp. 45-57 ◽  
Author(s):  
A. Stanisławska

Abstract Bacterial nanocellulose (BNC) is a nanofibrilar polymer produced by strains such as Gluconacetobacter xylinus, one of the best bacterial species which given the highest efficiency in cellulose production. Bacterial cellulose is a biomaterial having unique properties such as: chemical purity, good mechanical strength, high flexibility, high absorbency, possibility of forming any shape and size and many others. Such a large number of advantages contributes to the widespread use of the BNC in food technology, paper, electronic industry, but also the architecture in use. However, the greatest hopes are using the BNC in medicine. This text contains information about bacterial nanocellulose, its specific mechanical and biological properties and current applications.


2020 ◽  
pp. 1-12
Author(s):  
Mustapha Abba ◽  
Bemgba Bevan Nyakuma ◽  
Zaharah Ibrahim ◽  
Jamila Baba Ali ◽  
Saiful Izwan Abd Razak ◽  
...  

2014 ◽  
Vol 176 ◽  
pp. 18-19 ◽  
Author(s):  
Katarzyna Kubiak ◽  
Marta Kurzawa ◽  
Marzena Jędrzejczak-Krzepkowska ◽  
Karolina Ludwicka ◽  
Mariusz Krawczyk ◽  
...  

2021 ◽  
Vol 10 (02) ◽  
pp. 89
Author(s):  
Prima Besty Asthary ◽  
Saepulloh Saepulloh ◽  
Ayu Sanningtyas ◽  
Gian Aditya Pertiwi ◽  
Chandra Apriana Purwita ◽  
...  

Hampir sebanyak 90% industri farmasi di Indonesia masih menggunakan bahan baku impor. Indonesia memiliki salah satu bahan baku yang cukup melimpah yaitu selulosa. Bacterial nanocellulose (BNC) adalah hasil sintesis dari bakteri aerobic seperti bakteri asam asetat Gluconacetobacter spp. yang berbentuk selulosa murni dengan diameter berukuran nano. Bahan baku BNC yang digunakan dalam industri farmasi adalah BNC dalam bentuk slurry atau high viscose nanocellulose. Tujuan penelitian ini adalah untuk memilih bakteri dan kondisi optimum dalam memproduksi BNC. Bakteri yang digunakan adalah Gluconacetobacter xylinus dan Gluconacetobacter intermedius yang berasal dari InaCC-LIPI dan Gluconacetobacter sp. dari industri nata de coco. Inokulum dari ketiga jenis kultur bakteri tersebut dikultivasi selama 7 hari dalam medium Hestrin&Schramm (HS) cair menggunakan kultur statis dan agitasi dengan kecepatan pengadukan 150 rpm pada pH 5 dan suhu 25 ºC. Isolat bakteri Gluconacetobacter sp. dipilih sebagai bakteri penghasil BNC karena memiliki nilai yield paling tinggi. Kemudian isolat tersebut ditumbuhkan pada variasi kecepatan agitasi (100, 150, dan 200 rpm), variasi pH (4,0; 4,5; 5,0; dan 6,0), dan variasi suhu (25-30 ºC). Penelitian ini menunjukkan bahwa Gluconacetobacter sp. memiliki kondisi optimum pada kecepatan agitasi 150 rpm, pH 5,5, dan suhu 27 ºC. Optimization of Bacterial Nanocellulose Production in Agitation Culture MethodsAbstractAlmost 90% of pharmaceutical industry in Indonesia still uses imported raw material. However, Indonesia has one of the abundant raw materials which is cellulose. Bacterial nanocellulose (BNC) is a pure form of nanocellulose biopolymer material synthesized by microbes such as acetic acid bacteria of Gluconacetobacter spp. as pure cellulose and having diameter in nano scale. BNC used in pharmaceutical industry is in the slurry form/high viscose nanocellulose. The purpose of this study is to determine the bacteria and the optimum conditions to produce BNC. The bacteria used were Gluconacetobacter xylinus and Gluconacetobacter intermedius from InaCC-LIPI and Gluconacetobacter sp. from nata industry. The inoculums were cultivated for 7 days in liquid Hestrin & Schramm (HS) medium using static and agitation culture with a stirring speed of 150 rpm at pH 5 and temperature 25 ºC. The production of BNC has been conducted by using Gluconacetobacter sp., because it has the highest yield. Then it was inoculated at different variation of agitation speed (100, 150, and 200 rpm), pH (4.0; 4.5; 5.0; and 6.0), and temperature (25-30 ºC). This research shows that Gluconacetobacter sp. has optimum conditions at the agitation speed of 150 rpm, pH 5.5, and temperature 27 ºC.Keywords: Bacterial nanocellulose, Gluconacetobacter, agitation


MRS Bulletin ◽  
2010 ◽  
Vol 35 (3) ◽  
pp. 208-213 ◽  
Author(s):  
Paul Gatenholm ◽  
Dieter Klemm

AbstractNanocellulose, such as that produced by the bacteria Gluconacetobacter xylinus (bacterial cellulose, BC), is an emerging biomaterial with great potential as a biological implant, wound and burn dressing material, and scaffolds for tissue regeneration. BC has remarkable mechanical properties despite the fact that it contains up to 99% water. The water-holding ability is the most probable reason why BC implants do not elicit any foreign body reaction. Moreover, the nanostructure and morphological similarities with collagen make BC attractive for cell immobilization and cell support. The architecture of BC materials can be engineered over length scales ranging from nano to macro by controlling the biofabrication process. This article describes current and future applications of BC in the biomedical field.


2014 ◽  
Vol 13 (1) ◽  
pp. 62 ◽  
Author(s):  
Shuo Zhang ◽  
Sandra Winestrand ◽  
Xiang Guo ◽  
Lin Chen ◽  
Feng Hong ◽  
...  

Author(s):  
Joseph M. Schwertz ◽  
Paul Gatenholm ◽  
Alan W. Eberhardt

Bacterial nanocellulose (BNC) is a biopolymer that has been used in a variety of applications ranging from speaker diaphragms to biomedical products. With the exact chemical structure as that produced by plants, BNC is created by microbes like Gluconacetobacter xylinus. One of the unique aspects of BNC is its ability to have a wide variety of mechanical properties while in hydrogel form.


1996 ◽  
Vol 444 ◽  
Author(s):  
Hyeon-Seag Kim ◽  
D. L. Polla ◽  
S. A. Campbell

AbstractThe electrical reliability properties of PZT (54/46) thin films have been measured for the purpose of integrating this material with silicon-based microelectromechanical systems. Ferroelectric thin films of PZT were prepared by metal organic decomposition. The charge trapping and degradation properties of these thin films were studied through device characteristics such as hysteresis loop, leakage current, fatigue, dielectric constant, capacitancevoltage, and loss factor measurements. Several unique experimental results have been found. Different degradation processes were verified through fatigue (bipolar stress), low and high charge injection (unipolar stress), and high field stressing (unipolar stress).


2019 ◽  
Author(s):  
Francesco D’Elia ◽  
Philipp Hiester ◽  
Carlo Zimmermann ◽  
Igor Schestakow ◽  
Jelena Horky ◽  
...  

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