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. Author manuscript; available in PMC: 2012 Mar 1.

Published in final edited form as: Photochem Photobiol. 2011 Jan 4;87(2):275–283. doi: 10.1111/j.1751-1097.2010.00869.x

Table 1.

Quenching constants for the singlet excited state of PHEO by nucleosides in the presence and absence of CARBOQ.

	Guanosine		Adenosine		Inosine
	K_S-V 10³ M⁻¹	k_q 10¹¹M⁻¹S⁻¹	K_S-V 10³ M⁻¹	k_q 10¹¹ M⁻¹ S⁻¹	K_S-V 10³ M⁻¹	k_q 10¹¹ M⁻¹ S ⁻¹
PHEO	2.3 ± 0.2	4.9 ± 0.2	1.6 ± 0.3	3.4 ± 0.2	1.1 ± 0.2	2.3 ± 0.2
PHEO–CARBOQ mixture	4.1 ± 0.2	8.7 ± 0.3	2.2 ± 0.3	4.7 ± 0.3	1.6 ± 0.2	3.4 ± 0.3
Oxidation potential (V)^*	1.29		1.42		1.5

The lifetime of PHEO 4.7 ns (15) in PBS/7.4 was used.

^*

Ref. (32,33). PHEO = pheophorbide-a; CARBOQ = carboquone.