A switch-on xanthene-triphenylamine based fluorescent and colorimetric sensor for the detection of ultra-trace Hg2+ in food samples and living cells

2021 ◽  
pp. 131951
Author(s):  
Serkan Erdemir ◽  
Sait Malkondu
Keyword(s):  
Living Cells ◽  
Food Samples ◽  
Colorimetric Sensor ◽  
Ultra Trace

Kinetic-spectrophotometry method for determination of ultra trace amounts of aluminum in food samples

2009 ◽  
Vol 116 (4) ◽  
pp. 1019-1023 ◽  
Author(s):  
Shahryar Abbasi ◽  
Abbas Farmany ◽  
Mohammad Bagher Gholivand ◽  
Ali Naghipour ◽  
Freshteh Abbasi ◽  
...  
Keyword(s):  
Food Samples ◽  
Kinetic Spectrophotometry ◽  
Ultra Trace

scholarly journals A Highly Selective and Sensitive Spectrophotometric Method for the Determination of Lead at Ultra-trace Levels in Some Real, Environmental, Biological, Food and Soil Samples Using 5,7-Dibromo-8-Hydroxyquinoline

2019 ◽  
pp. 1-19
Author(s):  
M. Jamaluddin Ahmed ◽  
M. Tazul Islam ◽  
Sumaira Aziz
Keyword(s):  
Spectrophotometric Method ◽  
Stoichiometric Composition ◽  
Bovine Liver ◽  
Food Samples ◽  
Soil Samples ◽  
Standard Reference Materials ◽  
Complexing Agents ◽  
Linear Calibration ◽  
Ultra Trace

A very simple, ultra-sensitive and highly selective non-extractive spectrophotometric method for the determination of trace amounts of lead using 5,7-dibromo-8-hydroxyquinoline (DBHQ) has been developed. DBHQ reacts in a slightly acidic (0.0006-0.0025 M HCl) aqueous solution with lead (II) in 30% ethanolic media to produce highly absorbent a greenish-yellow chelate which has an absorption maximum at 390 nm. The reaction is instantaneous and the absorbance remains stable for over 24 h. The average molar absorption co-efficient and Sandal’s sensitivity were found to be 6.16 x 105 L mol-1cm-1 and 5 ng cm-2 of lead (II), respectively. Linear calibration graphs were obtained for 0.01- 60.0 mg L-1 of lead (II) having detection limit of 1.0 μg L-1 and RSD 0-2%. The stoichiometric composition of the chelate is 1:2 (Pb: DBHQ). A large excess of over 60 cations, anions and complexing agents (like, chloride, phosphate, azide, tartrate, oxalate, SCN- etc.) do not interfere in the determination. The developed method was successfully used in the determination of lead levels in several Standard Reference Materials (alloys, steels, natural water, bovine liver, human urine and hair) as well as in some environmental waters (potable and polluted), biological samples (human blood, urine and hair), soil samples, food samples (vegetables, rice, wheat) solutions containing both lead (II) and lead (IV) and complex synthetic mixtures. The results of biological and food analyses by the spectrophotometric method were found to be in excellent agreement with those obtained by AAS.

A new carboxamide probe as On-Off fluorescent and colorimetric sensor for Fe3+ and application in detecting intracellular Fe3+ ion in living cells

2020 ◽  
Vol 389 ◽  
pp. 112193 ◽  
Author(s):  
Soraia Meghdadi ◽  
Niloofar Khodaverdian ◽  
Azadeh Amirnasr ◽  
Pim J. French ◽  
Martin E. van Royen ◽  
...  
Keyword(s):  
Living Cells ◽  
Colorimetric Sensor

Detection of Tyrosinase in Real Food Samples and Living Cells by a Novel Near-Infrared Fluorescence Probe

2021 ◽  
Vol 69 (6) ◽  
pp. 1994-2000
Author(s):  
Ning Ding ◽  
Hui Xu ◽  
Shan Zong ◽  
Yubao Gong ◽  
Yitong Hao ◽  
...  
Keyword(s):  
Near Infrared ◽  
Fluorescence Probe ◽  
Living Cells ◽  
Food Samples ◽  
Near Infrared Fluorescence
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