Table 3.

Textural properties and histamine uptake capacities of Cuban and Mexican zeolites having different particle sizes

Zeolite	Particle size classa	BET surface area (m2 g−1)	Total pore volume (cc g−1)	Histamine uptake (mg/g zeolite) at different incubation time intervalsb
				15 min	30 min	60 min	120 min
Cubanc	A	98	0.220	16.3	18.8	19.9	22.4
Cubanc	B	119	0.199	15.7	13.7	16.0	15.7
Mexicand	B	30	0.182	10.4	9.0	9.5	10.2
Mexicand	C	31	0.154	4.1	6.6	5.7	5.7
Mexicand	As received	30	0.145	6.0	5.6	6.9	6.5

Histamine uptake studies: 3 g of zeolite, 100 mL double distilled water (pH = 7), 0.3 g histamine, temperature = 36 °C

^aClassification: Cuban A: ~ 3 µm, Cuban B: ~ 40 µm, Mexican B: < 100 µm, Mexican C: > 150 µm; see Table 2 and Fig. 3

^bDetermined by TG measurements in the temperature range of 350–600 °C

^cSan Andrés

^dMina San Francisco