نتایج جستجو برای: l ascorbic acid determination
تعداد نتایج: 1496572 فیلتر نتایج به سال:
Skin-lightening agents such as kojic acid, arbutin, ellagic acid, lucinol and 5,5′-dipropylbiphenyl-2,2′-diol are used in ‘anti-ageing’ cosmetics. Cases of allergic contact dermatitis caused by these skin-lightening agents have been reported (1, 2). Vitamin C and its derivatives have also been used in cosmetics as skin-lightening agents for a long time. Vitamin C in topical agents is poorly abs...
Previous studies have shown that L-ascorbic acid is extensively oxidized to respiratory CO? in rats (1, 2) and guinea pigs (3, 4). However, little information is available on the intermediates involved in the metabolism of the vitamin. In the present study experiments carried out with carboxyland uniformly labeled L-ascorbic acid point to the presence in rat kidney of an active enzyme system fo...
OBJECTIVE(S) The aim of this study was to investigate ascorbic acid and garlic protective effects on lead-induced neurotoxicity during rat hippocampus development. MATERIALS AND METHODS 90 pregnant wistar rats were divided randomly into nine groups: 1- Animals received leaded water (L). 2- Rats received leaded water and ascorbic acid (L+AA). 3- Animals received leaded water and garlic juice (...
Ascorbic acid enhances NO bioactivity in patients with vascular disease through unclear mechanism(s). We investigated the role of intracellular ascorbic acid in endothelium-derived NO bioactivity. Incubation of porcine aortic endothelial cells (PAECs) with ascorbic acid produced time- and dose-dependent intracellular ascorbic acid accumulation that enhanced NO bioactivity by 70% measured as A23...
The simultaneous spectrophotometric determination of phosphate and silicate ions in river water was examined by using ion-exclusion chromatography and post-column derivatization. Phosphate and silicate ions were separated by the ion-exclusion column packed with a polymethacrylate-based weakly acidic cation-exchange resin in the H(+)-form (TSKgel Super IC-A/C) by using ultra pure water as an elu...
The improvement of growth and flowering of petunia as one of the most popular and cultivated bedding plants in Iran, is of significant importance. Thus, a CRD experiment with five replications was conducted at the Research Greenhouse of Shahid Bahonar University, Kerman, Iran. From 48 days after sowing, when the seedlings had 5-6 true leaves, the seedlings were sprayed with thiamine (0 and 10...
BACKGROUND Concern has been raised that high levels of ascorbic acid consumption may lead to potential adverse effects, such as vitamin B12 deficiency, iron overload, and kidney stones. OBJECTIVE To examine the relation of serum ascorbic acid level, which reflects intake, to serum vitamin B12 level, serum ferritin level, and kidney stones. METHODS We analyzed data collected on a random samp...
Colon cancer patients with mutant KRAS are resistant to cetuximab, an antibody directed against the epidermal growth factor receptor, which is an effective clinical therapy for patients with wild-type KRAS. Numerous combinatorial therapies have been tested to overcome the resistance to cetuximab. However, no combinations have been found that can be used as effective therapeutic strategies. In t...
In our present study, different doses of allicin and L-ascorbic acid were tested against the genotoxic damage induced by chlormadinone acetate (CMA; 40 microM) using chromosomal aberrations (CAs) and sister chromatid exchanges (SCEs) as the parameters. Treatment with allicin and L-ascorbic acid resulted in reduction of CAs and SCEs. The results suggested a protective role of allicin and L-ascor...
Utilization of genistein as a natural inhibitor was studied alone and in combination with conventional treatments on melanosis and microbial quality of fresh L. vannamei during 10 days ice storage. Treatments were as followed: A (dipping samples in distilled water), B (dipping in 1.25 % sodium metabisulphite solution), C (dipping in 0.01 % genistein + 2% glycerol solution), D (dipping in 0.1 % ...
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