TABLE 1.

K _a and P _app values of some anthraquinone compounds absorbed in different intestines and colons of rats.

	Duodenum		Jejunum		Ileum		Colons		References
	K am (×10−4/s)	P app (×10−5 cm/s)	K a (×10−4/s)	P app (×10−5 cm/s)	K a (×10−4/s)	P app (×10−5 cm/s)	K a (×10−4/s)	P app (×10−5 cm/s)
AE	5.43–16.07	7.65–10.68	4.88–13.03	6.29–9.83	2.23–8.63	3.45–5.90	3.88–12.17	5.12–7.9	(Wang et al., 2011a; Wang et al., 2011b; Qiu et al., 2011)
CH	19.02	13.77	15.15	12.88	10.80	10.27	18.17	15.22
EM	15.55	10.18	11.45	7.98	8.38	5.65	12.45	8.05
PH	10.08	5.53	6.38	3.83	6.22	4.00	16.12	12.42
RH	6.96–10.68	6.15–8.91	5.70–11.13	7.95–8.22	4.79–6.27	4.17–6.59	5.18–6.55	3.85–8.92

K _a: absorption rate constant; P _app: apparent absorption coefficient; AE: aloe-emodin; CH: chrysophanol; EM: emodin; PH: physcion; RH: rhein. The number of male and female rats in the studies was equal.