Abstract
Abstract 1. 1. The hyaluronidase of crude extracts from testes of the honey bee (Apis mellifera) and of the oriental hornet (Vespa orientalis) was found to possess activity in depolymerizing hyaluronic acid and chondroitin-6-sulfate with pH optima 4·5–5·0. 2. 2. With an increase in incubation temperature from 37 to 56°C the enzyme showed a gradual increase in activity, in contrast with bovine and ovine testicular hyaluronidases which were gradulaly inactivated. 3. 4. Preheating for 3 hr at 50°C did not affect activity. This stability was shared by the venom hyaluronidase from the same insects but not by the mammalian hyaluronidases which were almost completely inactivated.
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