Thermal degradation and stability of cationic starches and their complexes with iodine

Danilovas, Paulius Pavelas; Rutkaitė, Ramunė; Zemaitaitis, Algirdas

doi:10.1016/j.carbpol.2014.06.038

Cited by 37 publications

(28 citation statements)

References 28 publications

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“…Symmetric triiodide units with halogen bonding character are more stable than asymmetric triiodide units and can be used as antimicrobial agents [42,43]. The stability and antimicrobial properties of such symmetric triiodide units remains high, even if incorporated into other polyiodide moieties like pentaiodides [40,44].Polymers can stabilize iodine, decrease the sublimation rate, increase long-term stability, durability, and controlled long-term release of iodine [45][46][47]. Povidone-iodine (PI) is a commercial disinfectant consisting of the polymer polyvinylpyrrolidone (PVP) and iodine [48].…”

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confidence: 99%

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“Smart” Antimicrobial Nanocomplexes with Potential to Decrease Surgical Site Infections (SSI)

et al. 2020

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The emergence of resistant pathogens is a burden on mankind and threatens the existence of our species. Natural and plant-derived antimicrobial agents need to be developed in the race against antibiotic resistance. Nanotechnology is a promising approach with a variety of products. Biosynthesized silver nanoparticles (AgNP) have good antimicrobial activity. We prepared AgNPs with trans-cinnamic acid (TCA) and povidone-iodine (PI) with increased antimicrobial activity. We synthesized also AgNPs with natural cinnamon bark extract (Cinn) in combination with PI and coated biodegradable Polyglycolic Acid (PGA) sutures with the new materials separately. These compounds (TCA-AgNP, TCA-AgNP-PI, Cinn-AgNP, and Cinn-AgNP-PI) and their dip-coated PGA sutures were tested against 10 reference strains of microorganisms and five antibiotics by zone inhibition with disc-and agar-well-diffusion methods. The new compounds TCA-AgNP-PI and Cinn-AgNP-PI are broad spectrum microbicidal agents and therefore potential coating materials for sutures to prevent Surgical Site Infections (SSI). TCA-AgNP-PI inhibits the studied pathogens stronger than Cinn-AgNP-PI in-vitro and on coated sutures. Dynamic light scattering (DLS), ultraviolet-visible spectroscopy (UV-Vis), Fourier Transform infrared spectroscopy (FT-IR), Raman, X-ray diffraction (XRD), microstructural analysis by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) confirmed the composition of TCA-AgNP-PI and Cinn-AgNP-PI. Smart solutions involving hybrid materials based on synergistic antimicrobial action have promising future perspectives to combat resistant microorganisms.Pharmaceutics 2020, 12, 361 2 of 36 20,000 related deaths in the United States in 2017 only and remains to be one of the important infection-associated mortality reasons [11,12]. The formation of biofilms on biotic and abiotic surfaces [13] paved the way for biofilm antibiotic tolerance as another major health threat [14,15]. This additional problem hampers the treatment of infections, most often gives rise to chronic infections, in the worst case to therapeutic failure, severe morbidity, and mortality [4]. More than 80% of microbial infections are caused by microbial biofilm formation and pose a severe health risk because treatment with antibiotics remains ineffective [16]. The incidence of chronic wound infections is increasing globally to alarming levels [17]. Chronic wounds are marked by high bacterial colonization and infection rates, which can be treated only by novel therapeutic approaches other than the use of conventional antibiotics [18,19]. Chronic wound tissues can contain microbiomes of complex communities with coexisting fungal and bacterial colonies of different strains within biofilms [20]. According to this inter-kingdom model, fungi like Candida albicans can offer structures for other bacteria (S. aureus, P. aeruginosa, Streptococcus spp., E. faecalis, E. coli, and Acinetobacter baumannii etc.) to attach, form intricate biofilms, and increase the resistance against any ...

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“…Polymers can stabilize iodine, decrease the sublimation rate, increase long-term stability, durability, and controlled long-term release of iodine [45][46][47]. Povidone-iodine (PI) is a commercial disinfectant consisting of the polymer polyvinylpyrrolidone (PVP) and iodine [48].…”

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confidence: 99%

“Smart” Antimicrobial Nanocomplexes with Potential to Decrease Surgical Site Infections (SSI)

et al. 2020

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“…The TG and DTG curves of UMCF and CMCF under the same conditions are shown in Figure 4. The results indicate that the thermal stability of cellulose fibrils after cationic modification is decreased, the thermal degradation temperature of UMCF is 328.06 ∘ C, and after cationic modification, the thermal degradation temperature of CMCF decreases to 314.24 ∘ C. The weight loss peak of UMCF is at 360 ∘ C, while the CMCF has two weight loss peaks, 305 ∘ C and 325 ∘ C. This results showed that the cationic modification reduced the thermal stability of cellulose fibrils to some extent; the possible reason was that the introduction of quaternary ammonium enhanced the mechanism of random chain scission due to its nucleophilic character [41][42][43]. Figure 5 shows the zeta potentials of pulp suspensions added three kinds of additives at various additive amounts.…”

Section: Thermal Decomposition Of Cellulose Fibrilsmentioning

confidence: 90%

Preparation and Application of Cationic Modified Cellulose Fibrils as a Papermaking Additive

Gao¹,

Qun

Yu³

et al. 2016

International Journal of Polymer Science

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This paper deals with cationic modified cellulose fibrils obtained by reacting the cellulose fibrils with 2,3-epoxypropyltrimethylammonium chloride (EPTMAC). The physical and chemical properties of unmodified cellulose fibrils (UMCF) and cationic modified cellulose fibrils (CMCF) were characterized by SEM, FTIR, degree of substitution, colloid titration, zeta potential, and thermogravimetric analysis. The experimental results showed that, after cationization, surface charge density and zeta potential reversed, thermal stability decreased, and new functional groups appeared, while the surface morphology did not show much difference from the UMCF. With the addition of three kinds of additives (UMCF, CMCF, and cationic starch (CS)) to BCTMP, the addition of UMCF and CMCF had little effect on zeta potential, while the addition of CS changed zeta potential obviously. With the increasing of additive amount, the bulk of paper sheets added CMCF did not change obviously, while the bulk of paper sheets added UMCF and CS decreased rapidly. With regard to physical strength, all the three kinds of additives could improve the tensile index and tear index; the tensile index of paper sheets added CS was higher than that of added UMCF and CMCF, while the tear index of paper sheets added CMCF was the highest among the three additives.

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“…In this context, inorganic antimicrobial agents, like the elements iodine, copper [15][16][17][18], and very recently both elements combined [19,20], as well as Li + , Na + , K + , other metal cations [21,22] and transition metals [23] have gained a growing interest in drug development and biocidal applications [24][25][26][27]. Especially iodine and copper are very essential to human health, nontoxic in most mammals, including humans, but have been approved and registered by the US Environmental Protection Agency (EPA) as antimicrobial agents and are used in many combinations in the food industry [17].…”

Section: Introductionmentioning

confidence: 99%

“…Only few years ago, Copper-Nanoparticles were also introduced against many microorganisms, offering new prospects for antimicrobial treatments [21], even in combination with chitosan, the derivative of the naturally occurring polymer chitin [25] leading to the emergence of polymer based antimicrobial applications [26]. Polymeric antibacterial agents, the new field of investigations, have the ability to increase the long-term effectiveness and the stability of the biocidal agent [27].…”

Section: Introductionmentioning

confidence: 99%

Antibacterial and Antifungal Activity of the Triiodide [Na(12-Crown-4)2]I3 on the Pathogens Escherichia coli, Streptococcus pyogenes, Streptococcus faecalis, Bacillus subtilis, Proteus mirabilis, Pseudomonas aeruginosa, Klebsiella pneumoniae and Candida albicans

Edis¹,

Bloukh²,

Sara³

2017

Preprint

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New antibacterial agents are needed to overcome the increasing number of infectious diseases caused by pathogenic microorganisms due to the emergence of multi-drug resistant strains. In this context, halogens, especially Iodine is known since ages for its antimicrobial activity. Therefore, especially triiodides encapsulated in organometallic complexes can be helpful as new agents against microorganisms. The aims of this work was to study the biological activity of [Na(12-Crown-4)2]I3 against gram positive Streptococcus pyogenes, Streptococcus faecalis, the spore forming bacteria Bacillus subtilis and gram negative bacteria Escherichia coli, Proteus mirabilis, Pseudomonas aeruginosa and Klebsiella pneumoniae, as well as the yeast Candida albicans. The antimicrobial and antifungal activities of the triiodide were determined by zone of inhibition plate studies. [Na(12-Crown-4)2]I3 exhibited potent antimicrobial activity on gram positive Streptochocci and the yeast C. albicans. Furthermore, the gram negative bacteria P. aeruginosa and K. pneumoniae were less effectively inhibited, while E. coli and P. mirabilis proved to be even resistant.

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Thermal degradation and stability of cationic starches and their complexes with iodine

Cited by 37 publications

References 28 publications

“Smart” Antimicrobial Nanocomplexes with Potential to Decrease Surgical Site Infections (SSI)

“Smart” Antimicrobial Nanocomplexes with Potential to Decrease Surgical Site Infections (SSI)

Preparation and Application of Cationic Modified Cellulose Fibrils as a Papermaking Additive

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