Self-Gelling Solid Lipid Nanoparticle Hydrogel Containing Simvastatin as Suitable Wound Dressing: An Investigative Study

Hydrogels, an advanced interactive system, is finding use as wound dressings, however, they exhibit restricted mechanical properties, macroscopic nature, and may not manage high exudate wounds or incorporate lipophilic actives. In this study, we developed a self-gelling solid lipid nanoparticle (SLNs) dressing to incorporate simvastatin (SIM), a lipophilic, potential wound-healing agent, clinically limited due to poor solubility (0.03 mg/mL) and absorption. The study explores unconventional and novel application of SIM. The idea was to incorporate a significant amount of SIM in a soluble form and release it slowly over a prolonged time. Further, a suitable polymeric surfactant was selected that assigned a self-gelling property to SLNs (SLN-hydrogel) so as to be used as a novel wound dressing. SLNs assign porosity, elasticity, and occlusivity to the dressing to keep the wound area moist. It will also provide better tolerance and sensory properties to the hydrogel. SIM loaded SLN-hydrogel was prepared employing an industry amenable high-pressure homogenization technique. The unique hydrogel dressing was characterized for particle size, zeta potential, Fourier transform infra-red spectroscopy, powder X-ray diffraction, differential scanning calorimetry, rheology, and texture. Significant loading of SIM (10% w/w) was achieved in spherical nanoparticule hydrogel (0.3 nm (nanoparticles) to2 µm (gelled-matrix)) that exhibited good spreadability and mechanical properties and slow release up to 72 h. SLN-hydrogel was safe as per the organization for economic co-operation and development (OECD-404) guidelines, with no signs of irritation. Complete healing of excision wound observed in rats within 11 days was 10 times better than marketed povidone-iodine product. The presented work is novel both in terms of classifying a per se SLN-hydrogel and employing SIM. Further, it was established to be a safe, effective, and industry amenable invention.

Synthesis and Characterization of Chitosan-Acrylic Acid Based Hydrogels and Investigation the Properties of Bilayered Design With Incorporated Alginate Beads

The paper presents the synthesis of hydrogels via free-radical polymerization, based on Chitosan (CS) grafted with Acrylic acid (AA), using a two-step procedure. Free-radical polymerization has given strong hydrogels with compact structure, dominant elastic behavior and long linear viscoelastic region. The results of rheological studies have shown that obtained hydrogels have significantly improved mechanical properties in comparison to chitosan hydrogels obtained by other sustainable methods. A step forward in the investigation of the potential application of chitosan hydrogels in wound dressing systems has been made by preparation of the bilayer design by embedding a layer of active compound-loaded alginate beads into the contact surface between two conjoined units of CS/AA hydrogels. Wild garlic (Allium ursinum L.) dried extract was used as an active compound because of its antimicrobial activity and green properties. This system has demonstrated pH-dependent release of extract and higher shear elastic modulus values than ordinary disc gels. A conducted study has given preliminary results for the possible application of bilayer chitosan - based hydrogels in wound dressing systems and represents the first step towards extrapolating the proposed design across other application fields.

Modelling Outpatients Cost of Wound Dressing in Nigeria: A Prospective Study

Background: Estimating the direct cost of wound dressing poses a challenge to patients, nurse managers, hospital administrators, health maintenance organisations and other policy makers. This study therefore model the weekly cost of wound dressing in South West NigeriaMethods: A descriptive cross sectional research design was utilized to assess the cost of wound dressing among outpatients’ clinics attendees. An inventory of direct cost of wound dressing per week consisting of cost of materials, lotion and consumables were recorded. The data collection was for period of three months in three selected Teaching Hospitals South West Nigeria. Then modelling weekly cost of wound types was done by regression analysis. The effect of various independent variables such as age, occupation, family size, monthly income, aetiology, diagnosis, wound type, comorbidities, frequency of wound dressing and health insurance coverage on cost of wound dressing per week was considered. Ethical approval was obtained from each of the hospital and Covid-19 precautions were observed.1 USD equalled ₦570Results: The estimated cost of wound dressing per week with no contribution from other variables was found to be ₦36,922- Open wound, ₦6011-Leg ulcer, ₦3768- Cancer wound, ₦2785- Diabetic Foot Ulcer, ₦610-Surgical wound. Only frequency of wound dressing was found to contribute to weekly cost of leg ulcers (P value= 0.003)Conclusions: The estimated cost of various type of wound provides yardstick for determining the weekly cost of wound dressing in Nigeria. Also, frequency of wound dressing is a major determinant of the outpatient cost of dressing. Therefore, it is imperative for nurses to render high quality wound care to match up with the huge financial commitment from patients and families

Gentamicin-Montmorillonite Intercalation Compounds as an Active Component of Hydroxypropylmethylcellulose Bionanocomposite Films with Antimicrobial Properties

The present study introduces an overview of gentamicin-clay mineral systems for applications in biomedicine and then focuses on the development of a series of gentamicin/clay hybrid materials to be used as the bioactive phase of hydroxypropylmethylcellulose (HPMC) to produce bionanocomposite membranes possessing antimicrobial activity of interest in wound-dressing applications. Gentamicin (Gt) was adsorbed from aqueous solutions into a montmorillonite (Cloisite®-Na+) to produce intercalation compounds with tunable content of the antibiotic. The hybrids were characterized by CHN chemical analysis, energy-dispersive X-ray analysis, X-ray diffraction, Fourier-transform infrared spectroscopy, and thermogravimetric analysis, confirming the intercalation of Gt by an ion-exchange mechanism. The release of Gt from the hybrids was tested in water and in buffer solution to check their stability. Hybrids with various amounts of Gt were incorporated into a HPMC matrix at various loadings and processed as films by the casting method. The resulting Gt-clay/HPMC bionanocomposites were characterized by means of field-emission scanning electron microscopy, and were also evaluated for their water-adsorption and mechanical properties to confirm their suitability for wound-dressing applications. The antimicrobial activity of the bionanocomposite films was tested in vitro toward various microorganisms (Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus, methicillin-resistant Staphylococcus aureus (MRSA), vancomycin-resistant Enterococcus faecium, Acinetobacter baumannii, and Klebsiella pneumonia), showing a complete bacterial reduction even in films with small Gt contents.

Economic Burden of Inpatient Wound Dressing in Nigeria: Implication for Catastrophic Household Expenditure

Background: The literature is replete with family impoverishment resulting from out of pocket healthcare financing on the Africa continent. In Nigeria the healthcare insurance scheme is evolving and requires wider coverage. The aim of this study is to examine catastrophic household expenditure emanating from daily or alternate day wound dressing.Methods. The study was based on a descriptive cross-sectional research design to investigate the economic burden of daily or alternate day wound dressing among hospitalized patients in selected teaching hospitals in south west Nigeria. The inclusion criteria focused on inpatients about to be discharged or already spent minimum of four weeks in hospital. The data collection instrument was pre-tested with a coefficient of stability of 0.774. Respondents were selected via convenience sampling while an interview administered questionnaire was used to elicit information on wound care from patients in medical surgical wards. Covid-19 protocols were strictly adhered to and ethical approval was sought from each hospital.Results: The result revealed that the mean age of the respondents was 44.95 ± 16.12. Two-thirds were men who are artisans and traders with only secondary school education. Over 70% of the respondents have between 5 and 10 family members, more than 50% earn less than ₦50000 per month. The majority have no comorbidities (79.5%), about 50% were on daily dressing which required 1–5 moderate or major dressing packs per week. The length of hospital stay for the majority of the respondents (85.3%) was less than 11 weeks.Conclusions: The daily or alternate day wound dressing requires a financial input beyond the coping capacity of the indigenous Nigerian families. The Nigerian government should scale up coverage of health insurance scheme to cover artisans, small traders and other low income earners to reduce the incidence of catastrophic household expenditure.

Mussel-inspired adhesive gelatin–polyacrylamide hydrogel wound dressing loaded with tetracycline hydrochloride to enhance complete skin regeneration

Even though the global wound care market size was valued at USD 19.83 billion in 2020, it is still a challenge to develop a hydrogel-based wound dressing with a good mechanical property, adhesiveness and antibacterial property.