Table 2.

Predicted acute toxicity to Daphnia, fish, and green algae for some intermediates of curcumin photodegradation: $L{C}_{50}$, $E{C}_{50}$, $log K_{O/w}$, water-solubility, acute toxic unit (TU), and toxicity classification.

	Compound	2 (194 m/z)	13 (278 m/z)	9 (370 m/z)
Organism	Structure
Daphnia	$L{C}_{50}$ (mg L−1)	287.5	2.3 × 104	988.16
	TU	3.5 × 10−3	4.3 × 10−5	1.2 × 10−3
Fish	$L{C}_{50}$ (mg L−1)	534.4	7.3 × 103	1.9 × 103
	TU	1.9 × 10−3	1.4 × 10−4	5.3 × 10−4
Green algae	$E{C}_{50}$ (mg L−1)	171.3	1.8 × 104	525.5
	TU	5.8 × 10−3	5.4 × 10−5	1.9 × 10−3
	Toxicity	Non-toxic	Non-toxic	Non-toxic
	$log K_{O/w}$	1.42	−1.93	1.12