Effects of Acetylene and Carbon Monoxide on Long-Term Hydrogen Production by Mastigocladus laminosus, a Thermophilic Blue-Green Alga

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Long-term H_2 production by a thermophilic and heterocystous blue-green alga (cyanobacterium) Mastigocladus laminosus was studied under the conditions when acetylene and carbon monoxide were supplemented to the gas phase of the culture vessel. The addtion of both gases enhanced H_2 evolution by nitrogen-starved cells. The concentrations of acetylene and carbon monoxide in the gas phase of argon/CO_2 (97.5/2.5) were 10% and 0.2-1%, respectively, for the maximum H_2 production.Renewals of the gas phase, in addition to the addition of ecetylene and carbon monoxide, were necessary for durable H_2 production. Since the concentrations of both H_2 and O_2 accumulated in the gas phase were minimized after the renewals, the H_2 uptake activity, which was not completely inhibited by acetylene and carbon monoxide, was reduced and thereby H_2 evolution was restored. Under such conditions, H_2 production for up to 20 days was observed under argon and N_2 atmospheres with average rates of 3.9 and 3.3μl/mg dry wt/h, respectively. H_2 evolution for 15 days was observed even under an air atmosphere containing acetylene and carbon monoxide. It was thus shown that prolonged production of H_2 was possible by the use of a blue-green alga which exhibits a high activity of H_2 uptake under nitrogen-starved conditions.
公益社団法人日本生物工学会の論文
1982-10-25