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Showing 1-30 of 43 results for "103217" within Papers
Iqbal Ahmad et al.
Journal of photochemistry and photobiology. B, Biology, 157, 113-119 (2016-02-26)
A study of the effect of ionic strength on the photodegradation reactions (photoreduction and photoaddition) of riboflavin (RF) in phosphate buffer (pH7.0) has been carried out using a specific multicomponent spectrometric method. It has been found that the rates of
Iqbal Ahmad et al.
Journal of photochemistry and photobiology. B, Biology, 82(1), 21-27 (2005-10-15)
A study of the effect of light intensity and wavelengths on photodegradation reactions of riboflavin (RF) solutions in the presence of phosphate buffer using three UV and visible radiation sources has been made. The rates and magnitude of the two
Iqbal Ahmad et al.
ISRN pharmaceutics, 2013, 958712-958712 (2013-11-01)
The polymerization of 1-3 M 2-hydroxyethyl methacrylate (HEMA) initiated by riboflavin/triethanolamine system has been studied in the pH range 6.0-9.0. An approximate measure of the kinetics of the reaction during the initial stages (~5% HEMA conversion) has been made to avoid
Iqbal Ahmad et al.
International journal of pharmaceutics, 390(2), 174-182 (2010-02-09)
The present investigation is based on a study of the effect of buffer and non-buffer divalent anions (phosphate, sulphate, tartrate, succinate, malonate) on the kinetics, product distribution and photodegradation pathways of riboflavin (RF) at pH 6.0-8.0. RF solutions (5x10(-5)M) were
Tamutenda Chidawanyika et al.
mBio, 11(4) (2020-08-14)
Extracellular hydrogen peroxide can induce oxidative stress, which can cause cell death if unresolved. However, the cellular mediators of H2O2-induced cell death are unknown. We determined that H2O2-induced cytotoxicity is an iron-dependent process in HAP1 cells and conducted a CRISPR/Cas9-based
Amit Tyagi et al.
Photochemistry and photobiology, 87(3), 524-533 (2010-11-26)
The spectroscopic behavior of lumichrome (7,8-dimethyl-alloxazine, LC) in aqueous solutions in a pH range from -1.08 to 14.6 is studied. Absorption spectra, fluorescence quantum distributions, quantum yields, and lifetimes are determined. The ionization stage of ground-state LC changes with rising
Tomoe Kageyama et al.
Nucleic acids symposium series (2004), (52)(52), 119-120 (2008-09-09)
By using lumichrome (Lch) as a masking ligand, we successfully control the binding selectivity of 2-amino-5,6,7-trimethyl-1,8-naphthyridine (ATMND) when binding to nucleobases in AP site-containing DNA duplexes (5'-TCT GCG TCC AGX GCA ACG CAC AC-3'/3'-AGA CGC AGG TCN CGT TGC GTG
Zhang-Gui Ding et al.
Magnetic resonance in chemistry : MRC, 47(4), 366-370 (2009-01-24)
An unprecedented new natural product named nocarsin A (1), 5H-4a,6,7a-triazacyclopenta[cd]indene-5,7(6H)-dione (1), together with seven known compounds lumichrome (2), cyclo (L-Leu-L-Tyr) (3), cyclo (L-Ala-L-Ile) (4), cyclo (L-Ala-L-Leu) (5), cyclo (L-Val-L-Ala) (6), 5-methyluracil (7) and uracil (8), was isolated from Nocardia alba
Vasilios F Diakonis et al.
European journal of ophthalmology, 22 Suppl 7, S51-S56 (2012-01-24)
To evaluate the time-dependent degradation rate of riboflavin after ultraviolet A (UVA) irradiation. Two solutions of commercially available riboflavin solution (0.1%) were used; one served as control, while the second was irradiated using UVA light at 370 nm wavelength. Four
Jessie Bong et al.
Food chemistry, 267, 355-367 (2018-06-24)
New Zealand manuka (Leptospermum scoparium) and kanuka (Kunzea ericoides) honeys contain a unique array of chemical markers useful for chemical fingerprinting. We investigated the presence of 13 potential marker compounds in nectars of the major honey crop species. We confirmed
Maria Marchena et al.
The journal of physical chemistry. B, 115(10), 2424-2435 (2011-02-22)
We report on photophysical studies of lumichrome (Lc) in water at different pHs, and interacting with the human serum albumin (HSA) protein and β-cyclodextrin (β-CD) in neutral aqueous solutions. We used steady-state and picosecond time-resolved emission spectroscopy to investigate the
G Ravi et al.
Glycoconjugate journal, 31(3), 247-258 (2014-03-20)
D-Ribitol, a five-carbon sugar alcohol, is an important metabolite in the pentose phosphate pathway; it is an integral part of riboflavin (vitamin B2) and cell wall polysaccharides in most Gram-positive and a few Gram-negative bacteria. Antibodies specific to D-ribitol were
Katsuhito Kino et al.
Bioorganic & medicinal chemistry letters, 19(7), 2070-2074 (2009-03-04)
Photoirradiation in the presence of riboflavin led to guanine oxidation and the formation of imidazolone. Meanwhile, riboflavin itself was degraded by ultraviolet light A (UV-A) and visible light (VIS) radiation, and the end product was lumichrome. VIS radiation in the
Chuan Liu et al.
Journal of cellular physiology, 233(11), 8971-8983 (2018-06-16)
The dynamic balance between bone resorption and bone formation is crucial to maintain bone mass. Osteoclasts are key cells that perform bone resorption while osteoblasts and osteocytes function in bone formation. Osteoporosis, a bone metabolism disease characterized by bone loss
Arif Sabah et al.
Pakistan journal of pharmaceutical sciences, 33(2(Supplementary)), 877-885 (2020-08-31)
The light sensitive pharmaceutical dosage forms are well protected from light by packing in light protective bottles especially the colored glass and plastic bottles. In the present study the transmission characteristics of transparent glass bottle, amber glass bottle, polyvinyl chloride
Sathish Rajamani et al.
Molecular plant-microbe interactions : MPMI, 21(9), 1184-1192 (2008-08-15)
Many bacteria use quorum sensing (QS) as an intercellular signaling mechanism to regulate gene expression in local populations. Plant and algal hosts, in turn, secrete compounds that mimic bacterial QS signals, allowing these hosts to manipulate QS-regulated gene expression in
Yusuke Sato et al.
Analytical sciences : the international journal of the Japan Society for Analytical Chemistry, 29(1), 15-19 (2013-01-11)
We describe a competitive binding assay for the analysis of single-base mutation by using abasic site (AP site)-specific binding fluorescent ligands and masking ligands bound to the AP site in DNA duplexes. 2-Amino-5,6,7-trimethyl-1,8-naphthyridine (ATMND) can strongly bind to not only
Leila Farzin et al.
Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy, 184, 109-118 (2017-05-12)
The exploration of novel adsorption properties of conductive polymers based on hybridization with biocompatible nanomaterials receives an increasing interest. In this regard, hydroxyapatite (HA) bioceramic is of critical importance mainly owing to its facile synthesis, high surface area, economic and
Iqbal Ahmad et al.
Journal of photochemistry and photobiology. B, Biology, 153, 358-366 (2015-11-08)
A study of the formulation of liposomal preparations of riboflavin (RF) with compositional variations in the content of phosphatidylcholine (PC) and their entrapment efficiency (26-42%) have been conducted. Light transmission characteristics of the liposomal preparations have been determined to evaluate
Partha Bairi et al.
The journal of physical chemistry. B, 114(35), 11454-11461 (2010-08-19)
Lumichrome (L) and melamine (M) produce thermoreversible hydrogels in LM31 and LM11 compositions, but LM13 composition does not produce hydrogel (the numbers indicate the respective molar ratio of the components). The formation of thermoreversible gels is confirmed from morphology, DSC
Homyra Tasnim et al.
Free radical biology & medicine, 156, 11-19 (2020-05-24)
MitoNEET is a mitochondrial outer membrane protein that hosts a redox active [2Fe-2S] cluster in the C-terminal cytosolic domain. Increasing evidence has shown that mitoNEET has an essential role in regulating energy metabolism in human cells. Previously, we reported that
Wipa Chantarawong et al.
Nutrition and cancer, 71(8), 1390-1402 (2019-05-11)
Lumichrome, a major derivative of riboflavin, may exhibit pharmacological activity against cancer cells. Riboflavin is a vitamin found in food, however, certain evidence has suggested its possible potentiating effects on cancer progression. Here, we have shown for the first time
Sara Gonçalves et al.
Environmental pollution (Barking, Essex : 1987), 238, 959-971 (2018-05-03)
Freshwater ecosystems are under threatening anthropogenic pressures worldwide, namely by metals. Diatoms are used as water quality indicators, but the influence of micronutrients such as Zn and its impacts are poorly understood. Thus, our study aimed to elucidate the tolerance
M Lilletvedt et al.
Die Pharmazie, 65(12), 871-876 (2011-02-03)
Complexation of the model drug lumichrome by 2-hydroxypropyl-beta-cyclodextrin (HPbetaCD), the most widely used cyclodextrin derivative in pharmaceutical preparations, was investigated in this study. The influence of frequently used pharmaceutical excipients, i.e. alcohols (ethanol, glycerol, propylene glycol), buffers (phosphate, citrate) and
Iqbal Ahmad et al.
Journal of photochemistry and photobiology. B, Biology, 93(2), 82-87 (2008-09-02)
The photolysis of riboflavin (RF) in the presence of borate buffer (0.1-0.5M) at pH 8.0-10.5 has been studied using a specific multicomponent spectrophotometric method for the determination of RF and photoproducts, formylmethylflavin (FMF), lumichrome (LC) and lumiflavin (LF). The overall
Chiheng Chu et al.
Environmental science & technology, 49(9), 5511-5519 (2015-04-02)
Photochemical transformations greatly affect the stability and fate of amino acids (AAs) in sunlit aquatic ecosystems. Whereas the direct phototransformation of dissolved AAs is well investigated, their indirect photolysis in the presence of chromophoric dissolved organic matter (CDOM) is poorly
Iqbal Ahmad et al.
International journal of pharmaceutics, 280(1-2), 199-208 (2004-07-22)
The kinetics of photolysis of aqueous riboflavin solutions on UV and visible irradiation has been studied in the pH range 1-12 using a specific multicomponent spectrophotometric method for the simultaneous determination of riboflavin and its major photoproducts (formylmethylflavin, lumichrome and
Hiroshi Kanazawa et al.
Journal of bacteriology, 200(12) (2018-04-04)
The actinobacterium Microbacterium maritypicum splits riboflavin (vitamin B2) into lumichrome and d-ribose. However, such degradation by other bacteria and the involvement of a two-component flavin-dependent monooxygenase (FMO) in the reaction remain unknown. Here we investigated the mechanism of riboflavin degradation
Benjamin Kachel et al.
Metabolic engineering, 62, 275-286 (2020-09-30)
Due to their capability of photosynthesis and autotrophic growth, cyanobacteria are currently investigated with regard to the sustainable production of a wide variety of chemicals. So far, however, no attempt has been undertaken to engineer cyanobacteria for the biotechnological production
Rongmin Huang et al.
Journal of agricultural and food chemistry, 54(6), 2359-2364 (2006-03-16)
Lumichrome and lumiflavin were formed from riboflavin under light. pH had a significant influence on the formation of lumichrome and lumiflavin from riboflavin. Lumichrome was the only major product from riboflavin under neutral or acidic pH values. Lumiflavin was also
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