Membranes from latex with propolis for biomedical applications

Silva, Angélica J.; Silva, Josmary R.; Souza, Nara C. de; Souto, Paula C. S.

doi:10.1016/j.matlet.2013.11.045

Cited by 43 publications

(31 citation statements)

References 14 publications

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“…As well, the spectral region from 1,630 to 1,680 cm −1 and also 1,510 to 1,570 cm −1 confirmed the presence of protein attributed to CO stretching vibration absorption of amide I and N–H and C–H bending vibration absorption of amide II, respectively, associated to the peptide bonds (CO–NH) (Carbonaro & Nucara, ). The peaks located at 1,438.1 and 1,259 cm −1 (Figure c) is indexed to methylene (CH 2 ) C–H bend and –C–O stretch of polyols like hydroxyflavonoids, respectively (Silva, Silva, de Souza, & Souto, ). Further, the spectral region from 1,200 to 900 cm −1 is mainly due to the carbohydrate (mainly lactose) and minerals showing recognizable peak at 1,072 cm −1 that can also be due to the phosphate groups (–PO 3 2 ) covalently bonded to casein (Boiani, FitzGerald, & Kelly, ).…”

Section: Resultsmentioning

confidence: 99%

Process optimization of polyphenol‐rich milk powder using bee pollen based on physicochemical and functional properties

Thakur

Nanda

2019

J Food Process Engineering

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The present study aims to optimize and explore the bee pollen as a functional component in milk powder using response surface methodology. The experimental design comprised of process variables: bee pollen (5–15%), temperature (20–30°C), and pressure (15–25 inHg) to investigate their effect on physical properties and total phenolic content of developed product. Results indicated an increase in powder recovery (41.53–52.96%) with pollen, temperature, and pressure whereas total phenolic content (12.35–22.65%) raised with pollen and pressure. The solubility (74.86–83.73%) and bulk density (0.37–0.63 g cm−3) decreased with pollen and temperature while hygroscopicity (13.10–18.29%) increased with pollen. The optimum conditions for polyphenol‐rich milk powder were 13.72% pollen, 26.84°C temperature, and 23.37 inHg pressure. Further, the morphological and FTIR analysis also strengthens the presence of polyphenols in optimized product. This investigation, thus, would open door for utilization of polyphenol‐rich milk powder in formulating several value‐added food products. Practical applications Bee pollen—a potent source of essential amino acids, fatty acids, dietary fiber, and polyphenols is an underutilized but nourishing food. This study aims at developing the vacuum‐dried bee pollen—rich milk powder based on process variable: bee pollen concentration, temperature, and pressure. Results showed the significant amount of total phenolic compounds in developed milk powder that is even higher compared to fresh bee pollen. The powder manufacturing process discussed here is quite simple and can be easily adapted by small and medium scale industries to achieve drying at a lower cost which may be beneficial for beekeepers to raise their economic status in developing countries. Further, the developed polyphenol‐rich milk powder can be employed in cereals, bakery, confectionery, and frozen dessert industry to make healthier processed food products.

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Section: Resultsmentioning

confidence: 99%

Process optimization of polyphenol‐rich milk powder using bee pollen based on physicochemical and functional properties

Thakur

Nanda

2019

J Food Process Engineering

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“…This band could be due to stretching vibration of C=C groups [21], due to aromatic ring deformations [23], due to flavonoids and amino acids: stretching vibration of C=O and of C=C, asymmetric bending vibration of N-H [24], due to C=O stretching vibration of caffeic acid and its derivatives [22] and due to stretching vibration of C=O of lipids and flavonoids [20]. The band at 1457 cm -1 could be related to CH 3 , CH 2 , flavonoids and aromatic rings, where the vibrations would be the bending (δ) vibration of C-H and the stretching vibration of aromatics [24] [25]. There were also found non-identified bands at 1350 cm -1 and 1289 cm -1 .…”

Section: Discussionmentioning

confidence: 99%

“…There were also found non-identified bands at 1350 cm -1 and 1289 cm -1 . The band at 1252 cm -1 would be due to vibration of C-O group of polyols, such as hydroxyflavonoids [25]. A band at 1086 cm -1 would be related to secondary alcohols [20] and/or to C-O-stretching ester group [22].…”

Section: Discussionmentioning

confidence: 99%

FTIR analysis and quantification of phenols and flavonoids of five commercially available plants extracts used in wound healing

et al. 2016

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Natural products are used in wound healing in order to prevent infection. Propolis is a well known antimicrobial with phenolic compounds and flavonoid content which vary according to the propolis origin. Besides propolis (from both Brazilian and UK sources), pomegranate, dragon's blood and sage are possible antimicrobials to be used in biomaterials. The goal of this work was to analyze the amount of phenols and flavonoid compounds in these natural products, their antioxidant activities and the bonds present by FTIR. The FTIR analysis revealed the presence of active compounds in all drug samples. The phenols quantification showed that Brazilian propolis was rich in phenols compared to the other drugs, followed by pomegranate and UK propolis. UK propolis was the most rich in flavonoids, which is expected on account of its origin. Pomegranate, UK propolis and Dragon's blood presented the highest antioxidant activity. All samples presented antioxidant activity > 82%.

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“…The samples’ swelling tests revealed the profile showed in Figure . All gels swelled more than 200%, which is characteristic of PVA hydrogels in aqueous media . It can be noted that there is a high swelling in the first hours and then a decrease in the swelling degree as the samples’ swelling degrees reach a plateau.…”

Section: Resultsmentioning

confidence: 86%

“…Propolis has recently been loaded into hydrogels designed for wound‐care with success, e.g. Brazilian propolis was previously incorporated in PVA hydrogels; biocelluloses membranes loaded with propolis were effective against S. aureus species; latex membranes loaded with propolis were active against C. albicans species . The goal of the present work was to incorporate a propolis from the United Kingdom into PVA hydrogels and to evaluate the gels microstructural, mechanical and swelling properties.…”

Section: Introductionmentioning

confidence: 99%

Properties of PVA Hydrogel Wound‐Care Dressings Containing UK Propolis

Oliveira

McGuinness

Ramos

et al. 2016

Macromolecular Symposia

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Summary Burns pose a potential threat to health, and often require dressings. PVA hydrogels present many characteristics of ideal dressings, but do not have any intrinsic antimicrobial properties. Propolis is a natural antimicrobial substance that can be incorporated in materials intended for wound‐care. The goal of this work was to produce and characterize (in terms of swelling behaviour, microstructural and thermal analysis) PVA gels loaded with a UK propolis. Propolis was loaded in the gels and it altered the crystallinity of the PVA gels. The thermal profile of the PVA‐UK propolis gels was different from that of PVA gel alone. All gels presented at least ∼200% of swelling degree. Weight loss as well as propolis release was high for samples with high amount of propolis. Samples with the highest amount of propolis still presented mechanical properties adequate for the application.

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Membranes from latex with propolis for biomedical applications

Cited by 43 publications

References 14 publications

Process optimization of polyphenol‐rich milk powder using bee pollen based on physicochemical and functional properties

Process optimization of polyphenol‐rich milk powder using bee pollen based on physicochemical and functional properties

FTIR analysis and quantification of phenols and flavonoids of five commercially available plants extracts used in wound healing

Properties of PVA Hydrogel Wound‐Care Dressings Containing UK Propolis

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