ABSTRACT
Staphylococcus aureus is an important pathogen that causes nosocomial infections, resulting in unacceptable morbidity and mortality rates. In this work, we proposed the construction of a nanostructured ZnO-based electrochemical immunosensor for qualitative and semiquantitative detection of S. aureus using simple methods for growing zinc oxide nanorods (ZnO NRs) on a sensor board and immobilizing the anti-S. aureus antibody on ZnO NRs through cystamine and glutaraldehyde. The immunosensor detected S. aureus in the 103-107 colony-forming unit (CFU) mL-1 range and showed a limit of detection (LoD) around 0.792 × 103 CFU mL-1. Beyond a satisfactory LoD, the developed immunosensor presented other advantages, such as high versatility for point-of-care assays and a suitable selective factor that admits the detection of the S. aureus concentration range in human hand skin after washing. Moreover, the immunosensor showed the potential to be an excellent device to control nosocomial infection by detecting the presence of S. aureus in human hand skin.
Subject(s)
Biosensing Techniques , Cross Infection , Electrochemical Techniques , Point-of-Care Systems , Skin , Staphylococcus aureus , Zinc Oxide , Humans , Staphylococcus aureus/isolation & purification , Cross Infection/prevention & control , Skin/microbiology , Biosensing Techniques/methods , Zinc Oxide/chemistry , Immunoassay/methods , Electrochemical Techniques/methods , Staphylococcal Infections/diagnosis , Staphylococcal Infections/microbiology , Hand/microbiology , Limit of Detection , Nanotubes/chemistry , Antibodies, Immobilized/chemistryABSTRACT
The literature considers children both a risk group for administering probiotic strains and one of the populations that can most benefit from it. Due to the health benefits associated to probiotic supplementation, this scope review sought to formulate a critical evaluation of how Lacticaseibacillus rhamnosus GG, carried in food and non-food matrices, and experimental design may affect the health promotion of infants and children. In this study, a literature search was conducted in three scientific databases: PubMed, Web of Science, and SciELO to retrieve research, published in English or Spanish, which administered L. rhamnosus GG to infants and children with any disease or in eutrophic condition. Three reviewers with an expert supervision screened 540 articles, published between 2001 and 2022, which were retrieved from the databases. The data extracted was compiled and shown in this scoping review. In total, was included, after criteria observation, 44 articles in this review. Intestinal disorders were the most frequent outcome in these studies (36.4%) and capsules, the most common vehicle for administering the probiotic strain (40.9%). Probiotic strain dose ranged from 105 to 1012 cfu/dose of L. rhamnosus GG and intervention length extended from one to more than 6 months. Food matrix showed health effects in 57.1% of the clinical trials and non-food matrix 46.7%, which indicates that the health-promoting effect of the probiotic GG strain may be equivalent between the two forms of delivery. However, the highly heterogeneous experimental designs prevent further analysis and a systematic review and meta-analysis is recommended to address just the outcomes of studies and achieve data homogeneity in order to determine which vehicle is the most suitable for health promoting.
Subject(s)
Lacticaseibacillus rhamnosus , Probiotics , Capsules , Child , Child Health , Health Promotion , Humans , Infant , Probiotics/therapeutic useABSTRACT
Therapies that accelerate the healing of burn injuries, improving the quality of life of the patient and reducing the cost of treatment are important. This study evaluated the effects of InGaP 670-nm laser therapy combined with a hydroalcoholic extract of Solidago chilensis leaves on burn wound healing in rats. Seventy-two rats were divided randomly into four groups: control untreated (C), treated with InGaP 670-nm laser with power density of 0.41 W/cm(2) and energy density of 4.93 J/cm(2) (L), treated with S. chilensis extract (S) and treated with S. chilensis extract and laser (LS). Second-degree burns were produced on the back of the animals with metal plate. Wound samples were collected on days 7, 14 and 21 of treatment for structural analysis, morphometry and Western blotting to quantify the expression of transforming growth factor beta 1 (TGF-ß1) and vascular endothelial growth factor (VEGF). The results showed that InGaP laser irradiation at 670 nm alone and combined with extract of S. chilensis promoted significant tissue repair responses in this experimental model, increasing the number of fibroblasts, collagen fibres and newly formed blood vessels throughout the experimental period and decreasing the number of granulocytes in burn wounds of second degree in all treated groups. Exclusive treatment of burn wounds with the hydroalcoholic extract of S. chilensis provided similar quantitative results to those seen in the untreated group throughout the experimental period. Therefore, it was observed in the L and LS groups different responses in the expression of TGF-ß1 and VEGF. The application of 670-nm laser alone or combined with the extract of S. chilensis promoted favourable responses in tissue repair of second-degree burns in this experimental model.
