The funds allocated to each regional corporation under sections 32-271 to 32-284, inclusive, may be used to guarantee the repayment of a working capital loan provided by a banking organization to finance an eligible project. In no event may a loan guarantee be for a term longer than five years. Any loan made by a banking organization that is guaranteed pursuant to sections 32-271 to 32-284, inclusive, shall be secured by a security agreement, chattel paper, loan agreement or such other instruments or documents deemed necessary or convenient by the regional corporation to secure the loan. Any guarantee made pursuant to said sections shall be backed by a minimum reserve account of at least fifty per cent of the amount guaranteed that is outstanding.