Table 3.

Spectrofluorimetry and electrochemical methods for determination of curcumin

Sample	Method type	Limit of detection	References
Spectrofluorimetric methods
Curry powder	Fluorimetric Method using the Enhancement of Mixed Micelle	0.017 ng/mL	Wang et al. (2006)
Drug sample	Fluorescent carbon dots	44.8 ng/mL	Shi et al. (2015)
Urine samples and	Nitrogen-doped carbon dots as fluorescent probe	31.24 ng/mL	Zhang et al. (2015)
Urine	Boron and nitrogen co-doped carbon dots	23.94 ng/mL	Bian et al. (2018)
Drinking water and the food samples	A nitrogen and phosphorus dual-doped carbon dots (NP-C dots)	21.37 ng/mL	Liu et al. (2018a)
Food matrix	Nitrogen and chlorine dual-doped carbon nanodots	14.00 ng/mL	Hu et al. (2019)
Electrochemical methods
Curcumin standard	Voltammetry-Glassy carbon electrode modified by carbon nanotubes	1.84 ng/mL	Daneshgar et al. (2009)
Multicomponent spices	Voltammetry- glassy carbon electrode	1.51 µg/mL	Ziyatdinova et al. (2012)
Curcumin standard	Cyclic Voltammetry- poly-Acid chrome blue K (poly- ACBK) film is synthesized on the surface of glassy carbon electrode (GCE)	15.10 ng/mL	Peng et al. (2012)
Spice powder	Adsorptive stripping voltammetry- Carbon-Screen Printed Electrodes	1.80 µg/mL	Wray et al. (2012)
Turmeric rhizomes	Voltammetric method- Graphene on Glassy carbon electrode	11.05 ng/mL	Li et al. (2014c)
Turmeric extractive	Voltammetric method- Electrochemically reduced Graphene oxide	36.84 ng/mL	Zhang et al. (2016)
Curcumin in plasma	Ru@Au nanoparticle decorated nitrogen and sulfur- functionalized reduced graphene oxide nanomaterials	0.073 pg/mL	Kotan et al. (2016)