A freeze–thaw PVA hydrogel loaded with guava leaf extract: physical and antibacterial properties

Waresindo, William Xaveriano; Luthfianti, Halida Rahmi; Edikresnha, Dhewa; Suciati, Tri; Noor, Fatimah A.; Khairurrijal, Khairurrijal

doi:10.1039/d1ra04092h

Cited by 38 publications

(69 citation statements)

References 106 publications

(140 reference statements)

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“…The hydrogel produced by this method provides a good delivery media for cells and bioactive molecules but has relatively low mechanical properties [32]. There are several types of methods for the manufacture of hydrogels through physical crosslinking, such as ionic crosslinking [33], hydrophobic interactions [34], thermoreversible gelation [35], complex coacervation [36], hydrogen bonding [37], and freezethaw [38,39]. On the other hand, the chemical crosslinking method uses covalent bonds between polymer chains for the manufacture of hydrogels, which can be accomplished by the addition of crosslinking agents, polymer conjugates, photosensitive agents, or enzyme-catalyzed reactions.…”

Section: Introductionmentioning

confidence: 99%

The Study of the Swelling Degree of the PVA Hydrogel with varying concentrations of PVA

Asy-Syifa

Kusjuriansah

Waresindo

et al. 2022

J. Phys.: Conf. Ser.

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Hydrogel is composed of a three-dimensional network of hydrophilic polymers and can swell when placed in an aqueous media. Polyvinyl alcohol (PVA) is a common polymer used to produce hydrogels because it has biocompatibility, non-toxicity, chemical stability, low cost, and excellent mechanical strength. In this study, the PVA solutions were prepared with concentrations of 6%, 8%, 10%, and 12% in distilled water. The precursor solutions underwent a freeze-thaw cycle with a freezing temperature of -25 °C for 20 hours and a thawing temperature of 37 °C for 4 hours and carried out for 6 cycles. The swelling degree and the gel fraction of the hydrogel were then determined. From the swelling degree results, the increase of the PVA concentration in the precursor solutions reduced the swelling degree of the hydrogel. Based on the gel fraction test, it was revealed that all PVA concentrations have approximately the same value of gel fraction at 97%. Additionally, the viscosity and the density were also measured. Both showed an increasing trend with the addition of PVA concentration, where the viscosity values from the smallest to highest concentrations were 12.4944, 34.1737, 93.8491, and 216.2979 cP while the density values were 0.9865, 0.9871, 0.9878, and 0.9885 gram.cm-3.

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Section: Introductionmentioning

confidence: 99%

The Study of the Swelling Degree of the PVA Hydrogel with varying concentrations of PVA

Asy-Syifa

Kusjuriansah

Waresindo

et al. 2022

J. Phys.: Conf. Ser.

Self Cite

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“…Statistical differences between groups were analyzed using one-way ANOVA followed by Tukey’s HSD (honestly significant difference) post hoc test. 56 This statistical test employed IBM SPSS 20 software (IBM, USA) to determine a significant difference with the confidence level higher than 95% ( p < 0.05). 56 The presence of functional groups and intermolecular interaction were identified by using a Fourier transform infrared (FTIR) spectroscope (Thermo Nicolet iS10, Japan).…”

Section: Methodsmentioning

confidence: 99%

“… 56 This statistical test employed IBM SPSS 20 software (IBM, USA) to determine a significant difference with the confidence level higher than 95% ( p < 0.05). 56 The presence of functional groups and intermolecular interaction were identified by using a Fourier transform infrared (FTIR) spectroscope (Thermo Nicolet iS10, Japan). The crystal structure of composite nanofibers was recorded using X-ray diffraction (XRD) (Rigaku MiniFlex 600, Japan).…”

Section: Methodsmentioning

confidence: 99%

“…The results were declared in mean ± standard deviation (SD). Statistical differences between groups were analyzed using one-way ANOVA followed by Tukey’s HSD (honestly significant difference) post hoc test . This statistical test employed IBM SPSS 20 software (IBM, USA) to determine a significant difference with the confidence level higher than 95% ( p < 0.05) .…”

Section: Methodsmentioning

confidence: 99%

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Dielectric Properties and Flexibility of Polyacrylonitrile/Graphene Oxide Composite Nanofibers

et al. 2022

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Energy storage and modern electronics industries are in essential need of high dielectric and highly flexible materials. In this study, polyacrylonitrile and reduced graphene oxide (PAN/GO) were prepared by electrospinning. The composite morphology produced a homogeneous, smooth, and flexible surface with high tensile strength and durability. The diameter of the fibers in the composite mats ranged from 232 to 592 nm. The X-ray diffraction pattern recording displayed a sharp peak characteristic centered between 20 and 30° angles with a maximum degree of crystallinity of 86.23%. The evaluation of the Fourier-transform infrared spectrum indicated the interaction between GO and PAN through hydrogen bonds. The differential scanning calorimetry measurements confirmed that GO acted as a nucleating agent that improves the thermal stability of the composite. The dielectric properties exhibited the relative permittivity of the composite of 86.4 with a dielectric loss (tan δ) of 4.97 at 10 2 Hz, and the maximum conductivity was achieved at 34.9 × 10 –6 Sm –1 at high frequencies.

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“…Due to their similar sizes to the carbon atom, nitrogen and oxygen can incorporate into the main structure of carbon, disrupting the typical π-electron network and rising reactivity [9,[11][12][13]. Thus, CDs that are synthesized through top-down methods using nitrogen and oxygen-containing raw materials typically have surface functional groups such as amino (-NH2), epoxy (-O-), hydroxyl (-OH), carbonyl carboxyl (-COOH), and (-(C=O)) [12,14,15].…”

Section: Introductionmentioning

confidence: 99%

Surface Functional Groups Effect on the Absorption Spectrum of Carbon Dots: Initial TD-DFT Study

Umami

Permatasari

Sundari

et al. 2022

J. Phys.: Conf. Ser.

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Carbon dots (CDs) have attracted considerable interest due to their remarkable performance, low cost and ease of preparation, and wide range of potential applications. Surface engineering, including modifying the surface functional group and subsequent chemical modification, is preferable to achieve the requirement of the specific application. Oxygen and Nitrogen-based surface functional groups are two common functionalizations on CDs that are subsequently generated during the synthetic process. In this study, we elucidate the optical properties of oxygen and nitrogen-functionalized CDs using time-dependent density functional theory (TD-DFT). Both considered functional groups, the carbon-oxygen double bond (-C=O) and amino groups (-NH2), are quite favourable to tailor the optical properties of CDs, especially in enhancing its absorption spectrum. Moreover, the carbonyl (-C=O) and amino (-NH2) functional groups effectively serve a new absorption peak in the first near-infrared window (650-900 nm). Our results suggest the potential application of the amino and carbonyl functionalized CDs as a photothermal agent in photothermal cancer therapy.

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A freeze–thaw PVA hydrogel loaded with guava leaf extract: physical and antibacterial properties

Abstract: A polyvinyl alcohol (PVA) hydrogel loaded with guava leaf extract (GLE) has potential applications as a wound dressing with good antibacterial activity.

Cited by 38 publications

References 106 publications

The Study of the Swelling Degree of the PVA Hydrogel with varying concentrations of PVA

The Study of the Swelling Degree of the PVA Hydrogel with varying concentrations of PVA

Dielectric Properties and Flexibility of Polyacrylonitrile/Graphene Oxide Composite Nanofibers

Surface Functional Groups Effect on the Absorption Spectrum of Carbon Dots: Initial TD-DFT Study

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