Colorimetric assay for the rapid determination of free-base nicotine in e-liquid

2020 ◽  
Vol 12 (2) ◽  
pp. 193-199
Author(s):  
Yan-Jun Huang ◽  
Qi-Xin Deng ◽  
Hong-Qiao Lan ◽  
Zheng-Zhong Fang ◽  
Hui Chen ◽  
...  
Keyword(s):  
Rapid Determination ◽  
Colorimetric Assay ◽  
Water Soluble ◽  
Free Base ◽  
Base Form

Nicotine exists in e-liquids primarily as the monoprotonated form and free-base form. The free-base form could be evaluated by use of a water-soluble indicator.

Rapid determination of melamine in milk using water-soluble CdTe quantum dots as fluorescence probes

2011 ◽  
pp. 1-12 ◽  
Author(s):  
Minwei Zhang† ◽  
Hong Ping† ◽  
Xianyi Cao ◽  
Hongkun Li ◽  
Fengrui Guan ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Rapid Determination ◽  
Water Soluble ◽  
Cdte Quantum Dots ◽  
Fluorescence Probes

Ion Exchange Method for Rapid Determination of Alkalinity of Water-Soluble Tea Ash Containing High Levels of Manganese

1980 ◽  
Vol 63 (3) ◽  
pp. 460-461
Author(s):  
Saidul Z Qureshi ◽  
Fadhil M Najib ◽  
Fahmi A Mohammed
Keyword(s):  
Ion Exchange ◽  
Cation Exchange ◽  
Exchange Resin ◽  
Rapid Determination ◽  
Cation Exchange Resin ◽  
Water Soluble ◽  
Exchange Method ◽  
Strong Cation Exchange ◽  
Ion Exchange Method

Abstract An ion exchange method to determine the alkalinity of water-soluble tea ash containing high levels of manganese is described. A chromatographic column containing a strong cation exchange resin (20–50 mesh) in Na+ form, with a bed volume of 5 mL is used. The present ion exchange method is compared to pH titrations and also to the official AOAC methods (31.012, 31.015, 31.016). Results with the new method are accurate and precise.

scholarly journals Phytochemical Screening and Effect of Cymodocea serrulata on HepG2-Human Hepatocellular Carcinoma Cell Line

2020 ◽  
Vol 11 (2) ◽  
pp. 1684-1691
Author(s):  
Kalpana C S ◽  
Kalaivani P ◽  
Vanitha V
Keyword(s):  
Colorimetric Assay ◽  
Coastal Region ◽  
Water Soluble ◽  
Assay Method ◽  
Viable Cells ◽  
South Indian ◽  
Hepatocellular Carcinoma Cell Line ◽  
Human Hepatocellular Carcinoma Cell ◽  
Cymodocea Serrulata

Cymodocea serrulata, a seagrass commonly known as karumbupassi has been used as a food and also as a medicine by coastal region people and by fishermen while traveling in the sea. It is used as a tranquilizer for babies as it has a soothing quality, it helps during pregnancy and against cough and malaria. C.serrulata is seen abundant in South Indian coastal region. Although there is a report on the antibacterial, antioxidant, and anti-inflammatory property of C.serrulata, there are no evident details on phyto-compounds present in it. Invitro antiproliferative test was performed by MTT (methylthiozoltetrazolium) assay method against HePG2 celline of liver cancer cells. MTT assay is a colorimetric assay used for the determination of cell proliferation and cytotoxicity, based on reduction of the yellow colored water soluble tetrazolium dye MTT to formazan crystals. Mitochondrial lactate dehydrogenase produced by liver cells reduces MTT to insoluble formazan crystals, which upon dissolution into an appropriate solvent exhibits purple color, the intensity of which is proportional to the number of viable cells and can be measured spectrophotometrically at 570nm.

Rapid Determination of Water-Soluble and Fat-Soluble Vitamins in Commercial Formulations by MEEKC

2010 ◽  
Vol 72 (7-8) ◽  
pp. 687-694 ◽  
Author(s):  
María S. Aurora-Prado ◽  
Claudinei A. Silva ◽  
Marina F. M. Tavares ◽  
Kevin D. Altria
Keyword(s):  
Rapid Determination ◽  
Water Soluble ◽  
Fat Soluble Vitamins

The selective deprotonation of carbon quantum dots for fluorescent detection of phosphate and visualization of latent fingerprints

Nanoscale ◽  
2021 ◽  
Author(s):  
Li Yang ◽  
Qi Zhang ◽  
Ying Han ◽  
Hongjuan Li ◽  
Shiguo Sun ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Rapid Determination ◽  
Carbon Quantum Dots ◽  
Water Soluble ◽  
Fluorescent Detection ◽  
Latent Fingerprints ◽  
Fluorescent Sensing ◽  
Turn On ◽  
Sensing Platform

We developed a water-soluble, stable and selective “turn-on” fluorescent sensing platform based on carbon quantum dots (CQDs) for rapid determination of the phosphate (Pi) in aqueous solutions and visualization of...

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