Synthesis and Characterization of Methylcellulose Produced from Bacterial Cellulose under Heterogeneous Condition

Oliveira, Ricardo Augusto Rabelo; Vieira, Júlia Graciele; Barud, Hernane S.; Assunção, Rosana Maria Nascimento de; Filho, Guimes Rodrigues; Ribeiro, Sidney J. L.; Messadeqq, Younes

doi:10.5935/0103-5053.20150163

Cited by 50 publications

(47 citation statements)

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“…The DSC thermograms of 5.0NR–BC50 and 10.0NR–BC50 exhibited a Tg at around −67 °C, slightly higher than the Tg of NR. The endothermic peaks exhibited by the NR–BC films between 30–150 °C are attributed to water loss or dehydration of the films [19,28]. NR loading into the BC matrices (2.5NR–BC50, 5.0NR–BC50, and 10.0NR–BC50) resulted in a slight change to the position of the exothermic peaks.…”

Section: Resultsmentioning

confidence: 99%

Development and Characterization of Bacterial Cellulose Reinforced with Natural Rubber

Potivara

Phisalaphong

2019

Materials

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Films of bacterial cellulose (BC) reinforced by natural rubber (NR) with remarkably high mechanical strength were developed by combining the prominent mechanical properties of multilayer BC nanofibrous structural networks and the high elastic hydrocarbon polymer of NR. BC pellicle was immersed in a diluted NR latex (NRL) suspension in the presence of ethanol aqueous solution. Effects of NRL concentrations (0.5%–10% dry rubber content, DRC) and immersion temperatures (30–70 °C) on the film characteristics were studied. It was revealed that the combination of nanocellulose fibrous networks and NR polymer provided a synergistic effect on the mechanical properties of NR–BC films. In comparison with BC films, the tensile strength and elongation at break of the NR–BC films were considerably improved ~4-fold. The NR–BC films also exhibited improved water resistance over that of BC films and possessed a high resistance to non-polar solvents such as toluene. NR–BC films were biodegradable and could be degraded completely within 5–6 weeks in soil.

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Section: Resultsmentioning

confidence: 99%

Development and Characterization of Bacterial Cellulose Reinforced with Natural Rubber

Potivara

Phisalaphong

2019

Materials

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“…The glycosidic linkage occurs in the 1010-1080 cm -1 region and below, at about 947 cm -1 , the vibration of the C-O-C bond in the 3,6-anhydro-D-galactose [56]. The IR spectrum of HPMC indicates the characteristics peaks of cellulose C-O-C at 1060 and 958 cm -1 [57].…”

Section: Infrared Spectroscopymentioning

confidence: 98%

Carrageenan-Based Acyclovir Mucoadhesive Vaginal Tablets for Prevention of Genital Herpes

et al. 2020

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Women are the most affected by genital herpes, which is one of the most common sexually transmitted infections, affecting more than 400 million people worldwide. The application of vaginal microbicides could provide a safe method of protection. Acyclovir is a safe and effective medication for vaginal administration, and numerous benefits have been observed in the treatment of primary or recurrent lesions due to genital herpes. Vaginal tablets based on a combination of the polymers iota-carrageenan and hydroxypropyl methylcellulose were developed for the controlled release of acyclovir. Swelling, mucoadhesion and drug release studies were carried out in simulated vaginal fluid. The tablets, containing a combination of iota-carrageenan and hydroxypropyl methylcellulose, have an adequate uptake of the medium that allows them to develop the precise consistency and volume of gel for the controlled release of acyclovir. Its high mucoadhesive capacity also allows the formulation to remain in the vaginal area long enough to ensure the complete release of acyclovir. These promising formulations for the prevention of genital herpes deserve further evaluation.

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“…BCM spectrum band (Figure 1). is characterized by assigned to C−O−C stretching within an anhydroglucose ring in 1,035 cm -1 , this band stretching can be found between 950 -1,100 cm -1 ; C-H, C-H 2, and C-H 3 stretching between 1,320 and 1,466 cm -1 ; C-H and O-H stretching become visible, respectively, in 2,897 cm -1 and 3,346 cm -1 [28][29][30][31].…”

Section: Spectroscopy By Ftirmentioning

confidence: 93%

Medicinal plant extract associated with bacterial cellulose membrane: Antibacterial activity and physicochemical properties

Batain¹,

Crescencio²,

Alves³

et al. 2020

Arch Pharm Pharma Sci

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Burns injuries induce a state of immunodepression that predisposes to a bacterial infectious complication that leads to several comorbid diseases and high mortality rate. Previous studies about anti-infl ammatory, antimicrobial and antioxidant properties of Aloe vera (L.) Burm., Calendula offi cinalis L. and Matricaria recutita L. are acknowledge by antimicrobial effects. Previous studies about anti-infl ammatory, antimicrobial and antioxidant properties of Aloe vera (L.) Burm., Calendula offi cinalis L. and Matricaria recutita L. are knowledge by antimicrobial effects. Bacterial cellulose membrane (nature BCM) is a potential carrier as a drug delivery system in the wound and burn treatment. The present study aimed to evaluate the antibacterial activity of extracts of A. vera, C. offi cinalis, and M. recutita incorporated in BCM against bacterial strains commonly present in wound and burns. The agar-dilution susceptibility testing was used to determine the minimum inhibitory concentration (MIC) for S. aureus, E. coli, and P. aeruginosa. The standardized extracts of A. vera, M. recutita, and C. offi cinalis were, respectively, used at 3.25% of total polysaccharides, 1% of apigenin 7-O-glucoside and 0.084% of total fl avonoids expressed in quercetin. The BCM incorporated with A. vera extract was effi cient to prevent the growth of P. aeruginosa and S. aureus. BCM loaded with C. offi cinalis inhibited the growth of S. aureus. The BCM loaded with A. vera and C. offi cinalis extract showed better antibacterial activities against P. aeruginosa and S. aureus and, consequently, properties to prevent infectious disease in the wound or burn caused by these bacteria.

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Synthesis and Characterization of Methylcellulose Produced from Bacterial Cellulose under Heterogeneous Condition

Cited by 50 publications

References 0 publications

Development and Characterization of Bacterial Cellulose Reinforced with Natural Rubber

Development and Characterization of Bacterial Cellulose Reinforced with Natural Rubber

Carrageenan-Based Acyclovir Mucoadhesive Vaginal Tablets for Prevention of Genital Herpes

Medicinal plant extract associated with bacterial cellulose membrane: Antibacterial activity and physicochemical properties

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