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Topical ascorbic acid

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https://www.readbyqxmd.com/read/29905754/a-novel-signal-on-photoelectrochemical-sensor-for-ultrasensitive-detection-of-alkaline-phosphatase-activity-based-on-a-tio-2-g-c-3-n-4-heterojunction
#1
Feng Xia Wang, Cui Ye, Shi Mo, Liu Li Liao, Xiao Fang Zhang, Yu Ling, Lu Lu, Hong Qun Luo, Nian Bing Li
The use of alkaline phosphatase (ALP) as a biomarker in some diseases including hepatitis, obstructive jaundice, osteoblastic bone cancer, and osteomalacia is important in clinical diagnosis. Furthermore, ALP activity detection is an essential hot topic in environmental monitoring, biomedical research, and other research fields. In this study, a novel "signal-on" photoelectrochemical (PEC) biosensor based on the ALP-catalyzed phosphorylation reaction was designed to sensitively detect ALP activity...
July 21, 2018: Analyst
https://www.readbyqxmd.com/read/29895113/-how-to-improve-the-prevention-and-treatment-of-ocular-chemical-burns-in-china-important-elements
#2
Y F Huang, L L Wang
Ocular chemical burns are common and serious ocular emergencies which require immediate and intensive evaluation and treatment. Loss of vision and disfigurement affect the victims, bringing great sufferings to themselves and their families. China is the biggest developing country in the world with a large number of such cases. The prevention of ocular chemical burns is emphasized in different aspects. After emergency treatment, proper care of chemical burns is started by control of inflammation with corticosteroids...
June 11, 2018: [Zhonghua Yan Ke za Zhi] Chinese Journal of Ophthalmology
https://www.readbyqxmd.com/read/29881301/antiaging-effects-of-a-novel-facial-serum-containing-l-ascorbic-acid-proteoglycans-and-proteoglycan-stimulating-tripeptide-ex-vivo-skin-explant-studies-and-in-vivo-clinical-studies-in-women
#3
Aurora Garre, Mridvika Narda, Palmira Valderas-Martinez, Jaime Piquero, Corinne Granger
Background: With age, decreasing dermal levels of proteoglycans, collagen, and elastin lead to the appearance of aged skin. Oxidation, largely driven by environmental factors, plays a central role. Aim: The aim of this study was to assess the antiaging efficacy of a topical serum containing L-Ascorbic acid, soluble proteoglycans, low molecular weight hyaluronic acid, and a tripeptide in ex vivo and in vivo clinical studies. Methods: Photoaging and photo-oxidative damage were induced in human skin explants by artificial solar radiation...
2018: Clinical, Cosmetic and Investigational Dermatology
https://www.readbyqxmd.com/read/29527920/effects-of-an-antioxidant-protective-topical-formulation-on-eye-exposed-to-ultraviolet-irradiation-a-study-in-rabbit-animal-model
#4
F Vizzarri, M Palazzo, S Bartollino, D Casamassima, B Parolini, P Troiano, C Caruso, C Costagliola
Ultraviolet-radiation exerts a well-known role in the development of various ocular diseases and may contribute to the progress of age-related macular degeneration. Therefore, the use of compounds able to protect the eyes from UV-induced cellular damage is challenging. The aim of this study has been to test the protective effects of an antioxidant topical formulation against UV-induced damage in rabbit eyes. Twelve male rabbits were used. Animals were divided into 4 groups of 3 animals each. Control group (CG) did not receive any irradiation and/or eye drop...
July 17, 2018: Physiological Research
https://www.readbyqxmd.com/read/29207818/clinical-efficacy-and-safety-on-combining-20-trichloroacetic-acid-peel-with-topical-5-ascorbic-acid-for-melasma
#5
Surabhi Dayal, Priyadarshini Sahu, Manoj Yadav, V K Jain
Introduction: Trichloroacetic Acid (TCA) is a versatile peeling agent for treatment of melasma. However, Post-Inflammatory Hyperpigmentation (PIH) is reported to be the most common side-effect associated with TCA peel. Topical Ascorbic Acid (AA) due to its effect as antioxidant and tyrosinase inhibitor helps to prevent PIH and maintains the response. Aim: To assess the clinical efficacy, safety and reduction in Melasma Quality of Life (MELASQOL) on combining 20% TCA peel with 5% ascorbic acid cream in epidermal melasma...
September 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/29136076/enhancing-the-photostability-of-poly-phenylene-ethynylene-for-single-particle-studies
#6
C F Calver, B A Lago, K S Schanze, G Cosa
Single molecule fluorescence (SMF) studies on conjugated polymers yield enhanced information on exciton dynamics and on the interplay between polymer conformation/morphology and photophysical behavior. SMF studies, however, demand good signal stability, excellent photostability, and high photon yields (a measure of both photostability and brightness) and thus the development of strategies to help conjugated polymers (CPs) meet these requirements is a topic of great interest. Here, we evaluate the effect of a number of triplet quencher additives on the photostability of a 49-mer long poly(phenylene-ethynylene) conjugated polymer bearing carboxylate side groups (PPE-CO2 -49) that is deposited onto 100 nm diameter SiO2 nanoparticles (NPs)...
December 6, 2017: Photochemical & Photobiological Sciences
https://www.readbyqxmd.com/read/29104718/topical-vitamin-c-and-the-skin-mechanisms-of-action-and-clinical-applications
#7
REVIEW
Firas Al-Niaimi, Nicole Yi Zhen Chiang
OBJECTIVE: This review article details the main mechanisms of action and clinical applications of topical vitamin C on the skin, including its antioxidative, photoprotective, antiaging, and antipigmentary effects. DESIGN: A PubMed search for the relevant articles on vitamin C and the skin was conducted using the following key words: "vitamin C," "ascorbic acid," "ascorbyl-6-palmitate,"and "magnesium ascorbyl phosphate." RESULTS: As one of the most powerful antioxidants in the skin, vitamin C has been shown to protect against photoaging, ultraviolet-induced immunosuppression, and photocarcinogenesis...
July 2017: Journal of Clinical and Aesthetic Dermatology
https://www.readbyqxmd.com/read/29062646/calcium-hydroxylapatite-combined-with-microneedling-and-ascorbic-acid-is-effective-for-treating-stretch-marks
#8
Gabriela Casabona, Paula Marchese
BACKGROUND: Stretch marks can have a negative psychological impact on some individuals. Methods are available for treating stretch marks, but high-quality evidence supporting their use is limited. We treat stretch marks using injections of diluted calcium hydroxylapatite (CaHA, Radiesse) filler combined with microneedling and topical ascorbic acid. This retrospective study evaluated the effectiveness of this combined therapy. METHODS: Subjects presented with red (n = 25) or white (n = 10) striae on their buttocks, thighs, knees, abdomen, and breasts...
September 2017: Plastic and Reconstructive Surgery. Global Open
https://www.readbyqxmd.com/read/29056677/effect-of-oral-alpha-lipoic-acid-in-preventing-the-genesis-of-canine-diabetic-cataract-a-preliminary-study
#9
David L Williams
Blinding cataract is a significant effect of canine diabetes with 75% of animals affected two years after diagnosis. Lens opacification occurs primarily through the generation of sorbitol, a sugar alcohol, through the action of aldose reductase (AR). The osmotic effect of sorbitol draws water into the lens, causing opacification. Inhibition of AR should thus prevent the generation of cataracts. A topical AR inhibitor has been shown to have this effect, as has the commercially available neutraceutical OcuGLO, containing the AR inhibitor alpha lipoic acid (ALA) together with other plant-based antioxidants...
March 16, 2017: Veterinary Sciences
https://www.readbyqxmd.com/read/28850926/ameliorative-effects-of-diospyros-lotus-leaf-extract-against-uvb-induced-skin-damage-in-balb-c-mice
#10
Byoung Ok Cho, Denis Nchang Che, Jae Young Shin, Hyun Ju Kang, Jang Ho Kim, Hyo Young Kim, Wan Goo Cho, Seon Il Jang
The aim of this study was to investigate the protective effect of Diospyros lotus leaf extract (DLE) on UVB-induced skin damage in mice. UVB irradiation of mice skin incurred significant damage to mice skin; increased thiobarbituric acid-reactive substance level; decreased superoxide dismutase; and glutathione levels in mice skin tissues. More so, UVB irradiation led to collagen degradation and infiltration of mast cell and neutrophils into mice skin leading to inflammation. However, topical application of DLE significantly reversed these conditions with the result comparable to l-ascorbic acid...
November 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28848261/circulating-oxidative-stress-caused-by-psoroptes-natalensis-infestation-in-indian-water-buffaloes
#11
Sumit Mahajan, Padma Nibash Panigrahi, Sahadeb Dey, Ananya Dan, Akhilesh Kumar, K Mahendran, P S Maurya
The present study reports the circulating oxidative stress associated with Psoroptes natalensis infestation in Indian water buffaloes. Three non-descriptive water buffaloes, age ranging between 4 and 9 years, presented to Referral Veterinary Polyclinic, IVRI, for treatment served as clinical subject. The infested animals were treated with Ivermectin subcutaneously and Amitraz topically along with antioxidant like ascorbic acid, Vitamin E and selenium. The level of lipid peroxidase was significantly higher (3...
September 2017: Journal of Parasitic Diseases: Official Organ of the Indian Society for Parasitology
https://www.readbyqxmd.com/read/28833652/bateman-purpura-dermatoporosis-a-localized-scurvy-treated-by-topical-vitamin-c-double-blind-randomized-placebo-controlled-clinical-trial
#12
RANDOMIZED CONTROLLED TRIAL
P Humbert, F Fanian, T Lihoreau, A Jeudy, G E Pierard
BACKGROUND: Bateman purpura is characterized by diffuse senile skin atrophy, senile purpura and spontaneous stellar pseudocicatrices. Cutaneous changes in the course of ageing have been related to lower levels of ascorbic acid into the dermis of elderly people. OBJECTIVE: In this study, we postulate that senile purpura could be linked to dermal vitamin C deficiency and could be corrected by topical administration of this vitamin. METHODS: A 12-weeks, hemi-member (forearm or leg), randomized double-blind comparative study was conducted in 18 patients with Bateman purpura aged over than 60 years...
February 2018: Journal of the European Academy of Dermatology and Venereology: JEADV
https://www.readbyqxmd.com/read/28640219/topical-application-of-trisodium-ascorbyl-6-palmitate-2-phosphate-actively-supplies-ascorbate-to-skin-cells-in-an-ascorbate-transporter-independent-manner
#13
Shuichi Shibuya, Ikuyo Sakaguchi, Shintaro Ito, Eiko Kato, Kenji Watanabe, Naotaka Izuo, Takahiko Shimizu
Ascorbic acid (AA) possesses multiple beneficial functions, such as regulating collagen biosynthesis and redox balance in the skin. AA derivatives have been developed to overcome this compound's high fragility and to assist with AA supplementation to the skin. However, how AA derivatives are transferred into cells and converted to AA in the skin remains unclear. In the present study, we showed that AA treatment failed to increase the cellular AA level in the presence of AA transporter inhibitors, indicating an AA transporter-dependent action...
June 22, 2017: Nutrients
https://www.readbyqxmd.com/read/28597122/nanoparticle-in-gel-system-for-delivery-of-vitamin-c-for-topical-application
#14
Sanjukta Duarah, Ramya Devi Durai, VedhaHari B Narayanan
Hyperpigmentation is a dermal condition of melanocyte proliferation, induced by various factors like ultraviolet radiation producing reactive oxygen species, DNA damage, and apoptosis. The application of topical antioxidants through the different type of formulations can help to prevent oxidative damage to the skin. L-ascorbic acid (vitamin C) is a water-soluble compound and the most abundant antioxidant in human skin, but this vitamin is unstable and loses its potency with poor formulation strategies. Nanotechnology has been effectively used to promote stability and therapeutic activity of various drug molecules...
October 2017: Drug Delivery and Translational Research
https://www.readbyqxmd.com/read/28591686/the-role-of-topically-applied-l-ascorbic-acid-in-ex-vivo-examination-of-burn-injured-human-skin
#15
Anna Pielesz, Dorota Biniaś, Rafał Bobiński, Ewa Sarna, Jadwiga Paluch, Wioletta Waksmańska
Wound treatment and healing is complex and is comprised of an elaborate set of processes including cellular, spectroscopic and biochemical ones as well as the "reaction" of local tissue to thermal injury. Vitamin C as l-ascorbic acid (LA) prevents injurious effects of oxidants because it reduces reactive oxygen species to stable molecules, it becomes oxidized to the short-lived ascorbyl radical. As a result, antioxidant treatment may contribute to minimizing injury in burn patients. The aim of this study is to assess changes in molecular structure of collagen extracted from human epidermis burn wound scab during incubation of the epidermis in l-ascorbic acid solution...
October 5, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28301692/vitamin-c-supplementation-for-the-primary-prevention-of-cardiovascular-disease
#16
REVIEW
Lena Al-Khudairy, Nadine Flowers, Rebecca Wheelhouse, Obadah Ghannam, Louise Hartley, Saverio Stranges, Karen Rees
BACKGROUND: Vitamin C is an essential micronutrient and powerful antioxidant. Observational studies have shown an inverse relationship between vitamin C intake and major cardiovascular events and cardiovascular disease (CVD) risk factors. Results from clinical trials are less consistent. OBJECTIVES: To determine the effectiveness of vitamin C supplementation as a single supplement for the primary prevention of CVD. SEARCH METHODS: We searched the following electronic databases on 11 May 2016: the Cochrane Central Register of Controlled Trials (CENTRAL) in the Cochrane Library; MEDLINE (Ovid); Embase Classic and Embase (Ovid); Web of Science Core Collection (Thomson Reuters); Database of Abstracts of Reviews of Effects (DARE); Health Technology Assessment Database and Health Economics Evaluations Database in the Cochrane Library...
March 16, 2017: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/28246476/is-a-split-dose-regimen-of-2-l-polyethylene-glycol-plus-ascorbic-acid-tolerable-for-colonoscopy-in-an-early-morning-visit-to-a-comprehensive-medical-check-up
#17
Ji Yeon Seo, Changhyun Lee, Eun Hyo Jin, Mi Hyun Yun, Joo Hyun Lim, Hae Yeon Kang, Jong In Yang, Su Jin Chung, Sun Young Yang, Joo Sung Kim
AIM: To evaluate the effectiveness and tolerability of a split-dose 2 L polyethylene glycol (PEG)/ascorbic acid (AA) regimen for healthy examinees who visited for comprehensive medical check-up in the early morning. METHODS: From February 2015 to March 2015, examinees of average risk who were scheduled for a colonoscopy in the morning were retrospectively enrolled. RESULTS: The 189 examinees were divided into split-dose and non-split-dose groups...
February 14, 2017: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/28225220/efficacy-of-ruscus-extract-hmc-and-vitamin-c-constituents-of-cyclo-3-fort%C3%A2-on-improving-individual-venous-symptoms-and-edema-a-systematic-review-and-meta-analysis-of-randomized-double-blind-placebo-controlled-trials
#18
REVIEW
Stavros K Kakkos, François A Allaert
INTRODUCTION: Venoactive drugs (VADs) are considered an important component of the medical (conservative) treatment of chronic venous disorders (CVDs). However, the efficacy of certain VADs on one or more individual leg symptoms may have not been extensively studied to justify a high level or grade of recommendation in guidelines on CVD. The aim of the present systematic review and meta-analysis was to study the effectiveness of VADs containing Ruscus across the spectrum of defined venous symptoms...
April 2017: International Angiology: a Journal of the International Union of Angiology
https://www.readbyqxmd.com/read/28171869/photometric-determination-of-ammonium-and-phosphate-in-seawater-medium-using-a-microplate-reader
#19
Hanna S Ruppersberg, Maren R Goebel, Svea I Kleinert, Daniel Wünsch, Kathleen Trautwein, Ralf Rabus
To more efficiently process the large sample numbers for quantitative determination of ammonium (NH4+) and phosphate (orthophosphate, PO43-) generated during comprehensive growth experiments with the marine Roseobacter group member Phaeobacter inhibens DSM 17395, specific colorimetric assays employing a microplate reader (MPR) were established. The NH4+ assay is based on the reaction of NH4+ with hypochlorite and salicylate, yielding a limit of detection of 14 µM, a limit of quantitation of 36 µM, and a linear range for quantitative determination up to 200 µM...
2017: Journal of Molecular Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28143406/vitamin-c-for-preventing-atrial-fibrillation-in-high-risk-patients-a-systematic-review-and-meta-analysis
#20
REVIEW
Harri Hemilä, Timo Suonsyrjä
BACKGROUND: Atrial fibrillation (AF), a common arrhythmia contributing substantially to cardiac morbidity, is associated with oxidative stress and, being an antioxidant, vitamin C might influence it. METHODS: We searched the Cochrane CENTRAL Register, MEDLINE, and Scopus databases for randomised trials on vitamin C that measured AF as an outcome in high risk patients. The two authors independently assessed the trials for inclusion, assessed the risk of bias, and extracted data...
February 1, 2017: BMC Cardiovascular Disorders
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