Preparation and fire resistance modification on tannin-based non-isocyanate polyurethane (NIPU) rigid foams.

Non-isocyanate polyurethane (NIPU) as a new type of polyurethane material has become a hot research topic in the polyurethane industry due to its no utilization of toxic isocyanates during the synthesis process. And the developing on recyclable biomass materials has also much attention in the industrial sector, hence the preparation and application of bio-based NIPU has also become a very meaningful study work. So, in this paper, tannin as a biomass material was used to synthesize tannin based non-isocyanate polyurethanes (TNIPU) resin, and then successfully prepared a self-blowing TNIPU foam at room temperature by using formic acid as initiator and glutaraldehyde as cross-linking agent.

[Study on inhibition on alpha-glucosidase and analysis of the hypoglycemic composition of lobster sauce].

Objective: To study the effects of lobster sauce and polysaccharide extracts on alpha-1,4-glucosidase activity by establishing on enzyme-inhibitor model.

Methods: Glucosidase activity was assayed at PH optima by PNPG substrate. Lobster sauce extracts were prepared by soaking, centrifagation.