Carbon Dot based Fluorescence sensor for Retinoic acid

2018 ◽  
Vol 3 (2) ◽  
pp. 673-677 ◽  
Author(s):  
Sristi Majumdar ◽  
Tuhin Bhattacharjee ◽  
Debajit Thakur ◽  
Devasish Chowdhury
Keyword(s):  
Retinoic Acid ◽  
Fluorescence Sensor ◽  
Carbon Dot

Paper carbon dot based fluorescence sensor for distinction of organic and inorganic sulphur in analytes

RSC Advances ◽  
2016 ◽  
Vol 6 (62) ◽  
pp. 57327-57334 ◽  
Author(s):  
Sristi Majumdar ◽  
Upama Baruah ◽  
Gitanjali Majumdar ◽  
Debajit Thakur ◽  
Devasish Chowdhury
Keyword(s):  
Fluorescence Sensor ◽  
Carbon Dot ◽  
Inorganic Sulphur

In this work a paper carbon dot (PCDs) based fluorescence sensor was developed which can distinguish between the organic and inorganic sulphur in analytes.

Dual-Emissive Near-Infrared Carbon Dot-Based Ratiometric Fluorescence Sensor for Lysozyme

2022 ◽  
Author(s):  
Wan Ji ◽  
Jialuo Yu ◽  
Jianxia Cheng ◽  
Longwen Fu ◽  
Zhiyang Zhang ◽  
...  
Keyword(s):  
Near Infrared ◽  
Fluorescence Sensor ◽  
Ratiometric Fluorescence ◽  
Carbon Dot

Fluorescence turn-on and turn-off sensing of pesticides by carbon dot-based sensor

2019 ◽  
Vol 43 (30) ◽  
pp. 12137-12151 ◽  
Author(s):  
Paulami Mandal ◽  
Dibakar Sahoo ◽  
Priyatosh Sarkar ◽  
Kaushik Chakraborty ◽  
Sukhen Das
Keyword(s):  
Aqueous Solution ◽  
Green Chemistry ◽  
Fluorescence Sensor ◽  
Carbon Dot ◽  
Turn On ◽  
Fluorescence Turn On

Green chemistry C-Dot-based ‘turn-on’ and ‘turn-off’ fluorescence sensor for pesticides [imidacloprid (LOD ∼ 0.013 μM) and tetradifon (LOD ∼ 0.04 μM)] in aqueous solution.

scholarly journals “Turn on” Fluorescence Sensor of Glutathione Based on Inner Filter Effect of Co-Doped Carbon Dot/Gold Nanoparticle Composites

2021 ◽  
Vol 23 (1) ◽  
pp. 190
Author(s):  
Thi-Hoa Le ◽  
Ji-Hyeon Kim ◽  
Sang-Joon Park
Keyword(s):  
Gold Nanoparticle ◽  
Fluorescence Intensity ◽  
Limit Of Detection ◽  
Inner Filter Effect ◽  
Fluorescence Sensor ◽  
Fluorescence Emission Spectrum ◽  
Nitrogen And Phosphorus ◽  
Carbon Dot ◽  
Filter Effect ◽  
Co Doped

Glutathione (GSH) is a thiol that plays a significant role in nutrient metabolism, antioxidant defense and the regulation of cellular events. GSH deficiency is related to variety of diseases, so it is useful to develop novel approaches for GSH evaluation and detection. In this study we used nitrogen and phosphorus co-doped carbon dot-gold nanoparticle (NPCD–AuNP) composites to fabricate a simple and selective fluorescence sensor for GSH detection. We employed the reductant potential of the nitrogen and phosphorus co-doped carbon dots (NPCDs) themselves to form AuNPs, and subsequently NPCD–AuNP composites from Au3+. The composites were characterized by using a range of spectroscopic and electron microscopic techniques, including electrophoretic light scattering and X-ray diffraction. The overlap of the fluorescence emission spectrum of NPCDs and the absorption spectrum of AuNPs resulted in an effective inner filter effect (IFE) in the composite material, leading to a quenching of the fluorescence intensity. In the presence of GSH, the fluorescence intensity of the composite was recovered, which increased proportionally to increasing the GSH concentration. In addition, our GSH sensing method showed good selectivity and sensing potential in human serum with a limit of detection of 0.1 µM and acceptable results.

Effects of Retinoic Acid and 1,25-Dihydroxyvitamin D3 on IFN-gamma Secretion by Mononuclear Leukocytes from Nulliparous and Postparturient Dairy Cattle

2000 ◽  
Vol 70 (3) ◽  
pp. 92-101 ◽  
Author(s):  
Burim Ametaj ◽  
Brian Nonnecke ◽  
Ronald Horst ◽  
Donald Beitz
Keyword(s):  
Retinoic Acid ◽  
Dairy Cattle ◽  
Dairy Cows ◽  
Dairy Cow ◽  
Pokeweed Mitogen ◽  
Mononuclear Leukocytes ◽  
Combined Effects ◽  
Ifn Gamma ◽  
Dihydroxyvitamin D ◽  
1,25 Dihydroxyvitamin D

Individual and combined effects of several isomers of retinoic acid (RA) and 1,25-dihydroxyvitamin D3 (1,25-(OH)2D3) on interferon-gamma (IFN-gamma) secretion by blood mononuclear leukocytes (MNL) from nulliparous and postparturient Holstein cattle were evaluated in vitro. In the first experiment, effects on incubation period (24 to 72 hours) and time of supplementation (0 to 32 hours) with all-trans, 9-cis, 13-cis-, and 9,13-dicis-RAs (0 to 100 nM) on IFN-gamma secretion by pokeweed mitogen (PWM)-stimulated (0 and 10 mug/ml) MNL from nulliparous cattle were evaluated. In the second experiment, MNL from postparturient cows (bled at 0, 2, 4, and 16 days postpartum) were stimulated with PWM (0 and 10 mug/ml) in the presence of RA isomers (9-cis- or 9,13-dicis-RA; 0 to 100 nM), 1,25-(OH)2D3 (0 to 100 nM), or with combinations of these metabolites. The results show that individual isomers of RA had no effect on IFN-gamma secretion by PWM-stimulated MNL from nulliparous or postparturient cows. Furthermore 1,25-dihydroxyvitamin D3 inhibited IFN-gamma secretion by MNL from nulliparous and postparturient dairy cows; however, the degree of inhibition was greater when 9-cis- and 9,13-dicis-RA were also present in the cultures. Finally mononuclear leukocytes from postparturient dairy cows produced substantially less IFN-gamma than did MNL from nulliparous cattle. It is concluded that retinoic acids individually did not affect the capacity of leukocytes from dairy cattle to secrete IFN-gamma. This result is in marked contrast to studies in monogastric species indicating that RAs inhibit IFN-gamma secretion by peripheral blood T cells. Inhibition of IFN-gamma secretion by 1,25-(OH)2D3 was potentiated by 9-cis- and 9,13-di-cis-retinoics acids, suggesting that an excess of dietary vitamins A and D may compromise further the naturally immunosuppressed postparturient dairy cow. Additional research is necessary to determine if the combined effects of these metabolites on IFN-gamma secretion represent an increased susceptibility of the dairy cow to infectious diseases during the periparturient period. Lower secretion of IFN-gamma by MNL from postpartutient dairy cows, relative to nulliparous cattle, suggests that recently-calved cows are naturally immunosuppressed.

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