scholarly journals SINTEZA I STRUKTURA BAKTERIJSKE CELULOZE PRIMENOM BAKTERIJA SIRĆETNOG VRENJA

2021 ◽  
Author(s):  
Aleksandra Janicijevic ◽  
◽  
Suzana Filipovic ◽  
Vladimir B. Pavlovic ◽  
Aleksandra Sknepnek ◽  
...  
Keyword(s):  
Ftir Spectroscopy ◽  
Everyday Life ◽  
Bacterial Cellulose ◽  
Food Industry ◽  
Cellulose Fibers ◽  
Time Intervals ◽  
Structure And Morphology ◽  
Synthesis Parameters ◽  
Naoh Treatment

As one of the most common biopolymers on Earth, cellulose has found an important role in food industry, biomedicine andbiotechnology. The process of obtaining cellulose fibers is often followed with the presence of the byproduct, whose removal is required procedure. From that reason, the process of obtaining material on a bacterial cellulose (BC) basis,finds wide application in everyday life. Having in mind her many features, we have investigated the change in structure and morphology of BC depending on the synthesis parameters. The influence of the medium volume and different time intervals of NaOH treatment relative to different BCN yields and structure. The mentioned changes were examined by XRD, FTIR spectroscopy, as well as SEM and EDS analyzes.

Natural paper-layered composites with air barrier properties achieved by coating with bacterial cellulose

BioResources ◽  
2020 ◽  
Vol 15 (4) ◽  
pp. 9569-9574
Author(s):  
Marta Kaźmierczak ◽  
Tomasz P. Olejnik ◽  
Magdalena Kmiotek
Keyword(s):  
Bacterial Cellulose ◽  
Food Packaging ◽  
Barrier Properties ◽  
Cellulose Fibers ◽  
Packaging Material ◽  
Layered Composites ◽  
Chemical Additives ◽  
Cellulosic Fibers ◽  
Biodegradable Packaging ◽  
Cellulose Pulp

In some respects the safest food packaging material is paper that is completely free of chemical additives, made only from primary cellulosic fibers. There is no information in the literature on giving paper barrier properties using nanocellulose without any additives, especially bacterial cellulose, by applying a coating to a fibrous semi-product. In order to prepare paper-layered composites, paper sheets made of beaten or non-beaten softwood or hardwood cellulose pulp, or their 50/50 (wt./wt.) mix, were used in the experiment. After the application of bacterial cellulose onto the sheets, the paper became completely impermeable to air, which means that fine microbial fibers had filled the voids (pores) between plant cellulose fibers. The results of the experiment could be regarded as a perfect, biodegradable packaging material.

scholarly journals Effects of chemical treatment on the structure and morphology of bacterial cellulose film

2019 ◽  
Author(s):  
Tito Arif Sutrisno ◽  
Heru Suryanto ◽  
Retno Wulandari ◽  
M. Muhajir
Keyword(s):  
Bacterial Cellulose ◽  
Chemical Treatment ◽  
Cellulose Film ◽  
Structure And Morphology

scholarly journals Optimization of the synthesis parameters of nanocomposites based on bacterial nanocellulose/Fe3O4

Tehnika ◽  
2021 ◽  
Vol 76 (3) ◽  
pp. 273-278
Author(s):  
Aleksandra Janićijević ◽  
Aleksandra Sknepnek ◽  
Miljana Mirković ◽  
Vladimir Pavlović ◽  
Suzana Filipović
Keyword(s):  
Scientific Community ◽  
Time Interval ◽  
Iron Salt ◽  
Bacterial Nanocellulose ◽  
Synthesis Conditions ◽  
Structure And Morphology ◽  
Synthesis Parameters ◽  
Acetic Fermentation ◽  
Engineering And Technology ◽  
The Matrix

Development in many areas of engineering and technology are closely linked to the development of new or improvement of existing materials. Having in mind wide use of bacterial nanocellulose (BNC) in various areas of everyday life, from biomedicine, ecology to electronics, BNC-based composites are becoming widely used and attracting the attention of the scientific community. It is especially important to examine in detail the synthesis parameters that affect the changes in the crystal structure and morphology of the obtained composites, having in mind that these changes have a crucial influence on their final functional properties. In this paper, a composite material based on bacterial nanocellulose BNC (as the matrix) and ferromagnetic Fe3O4 was studied. BNC was obtained by the activity of acetic fermentation bacteria after 7 days of growth in a suitable medium. The research is aimed to optimization of the Fe3O4 precipitation conditions. It's especially considering the time interval of BNC films spend in the iron salt solution. The influence of the performed synthesis conditions was considered by the SEMEDS, FTIR and XRD methods.

Cellulose Fibers from Solutions of Bacterial Cellulose in N-Methylmorpholine N-Oxide

2019 ◽  
Vol 51 (3) ◽  
pp. 175-181 ◽  
Author(s):  
I. S. Makarov ◽  
L. K. Golova ◽  
M. I. Vinogradov ◽  
I. S. Levin ◽  
T. I. Gromovykh ◽  
...  
Keyword(s):  
Bacterial Cellulose ◽  
Cellulose Fibers

scholarly journals Zhurkov’s Stress-Driven Fracture as a Driving Force of the Microcrystalline Cellulose Formation

Polymers ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 2952
Author(s):  
Sergey V. Stovbun ◽  
Mariya G. Mikhaleva ◽  
Aleksey A. Skoblin ◽  
Sergey V. Usachev ◽  
Sergey N. Nikolsky ◽  
...  
Keyword(s):  
Acid Hydrolysis ◽  
Microcrystalline Cellulose ◽  
Driving Force ◽  
Food Industry ◽  
Thermal Destruction ◽  
Chemical Conversion ◽  
Cellulose Fibers ◽  
Point Of View ◽  
Pure Product ◽  
Hydrolysis Of

Microcrystalline cellulose (MCC) is a chemically pure product of cellulose mechano-chemical conversion. It is a white powder composed of the short fragments of the plant cells widely used in the modern food industry and pharmaceutics. The acid hydrolysis of the bleached lignin-free cellulose raw is the main and necessary stage of MCC production. For this reason, the acid hydrolysis is generally accepted to be the driving force of the fragmentation of the initial cellulose fibers into MCC particles. However, the low sensibility of the MCC properties to repeating the hydrolysis forces doubting this point of view. The sharp, cleave-looking edges of the MCC particles suggesting the initial cellulose fibers were fractured; hence the hydrolysis made them brittle. Zhurkov showed that mechanical stress decreases the activation energy of the polymer fracture, which correlates with the elevated enthalpy of the MCC thermal destruction compared to the initial cellulose.

Features of the Synthesis of Functional Carbon Materials Produced from Carbohydrates

2021 ◽  
Vol 628 (6) ◽  
pp. 3-6
Author(s):  
Z. V. Bobyleva ◽  
◽  
M. O. Apostolova ◽  
G. P. Lakienko ◽  
A. M. Alekseeva ◽  
...  
Keyword(s):  
Thermogravimetric Analysis ◽  
Ftir Spectroscopy ◽  
Carbon Materials ◽  
Chemical Transformations ◽  
Hydrothermal Conditions ◽  
Structure And Morphology

This work is devoted to the synthesis of carbon materials from the most common carbohydrates in nature, glucose and cellulose. The chemical transformations of carbohydrates during carbonization were investigated using thermogravimetric analysis and FTIR-spectroscopy. The influence of the precursor and the pretreatment process on the structure and morphology of carbon materials was shown. The morphology of materials obtained from glucose and cellulose pretreated in the air was characterized by large irregular particles. In turn, the pretreatment of carbohydrates under hydrothermal conditions makes it possible to obtain materials consisting of microspheres.

scholarly journals Effect of peroxide treatment on the structure and transparency of bacterial cellulose film

2018 ◽  
Vol 204 ◽  
pp. 05015 ◽  
Author(s):  
Heru Suryanto ◽  
Tito Arif Sutrisno ◽  
M. Muhajir ◽  
Neena Zakia ◽  
Uun Yanuhar
Keyword(s):  
Bacterial Cellulose ◽  
Diffraction Peak ◽  
Cellulose Film ◽  
X Ray Diffraction ◽  
X Ray ◽  
Structure And Morphology ◽  
Pineapple Peel ◽  
Diffraction Angle ◽  
Structure Observation ◽  
Peel Extract

The cellulose extracts from plants are need of energy and have potential in damaging the environment so that an alternative cellulose source with more efficient results is by using bacteria to produce the cellulose fibers. This study aims to determine the effect of hydrogen peroxide (H2O2) treatment on the structure and transparency of biopolymer bacterial cellulose film (BCF). The method used is the making of BCF by utilizing pineapple peel extract and then cooking at 80°C for 120 min. with H2O2 concentration of 0%, 2.5%, 5%, and 7,5%. Drying is done in the electric oven and then observed the structure and morphology using X-ray diffraction and transparency test, respectively. The result of structure observation shows that the intensity of the highest diffraction peak lies at a diffraction angle of 22° achieved at 5% peroxide treatment with crystallinity and crystal index of 85.1% and 82.4%, respectively. Transparency testing shows that the higher the concentration of peroxide used, the better the transparency.

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