THE DIGESTIVE ENZYMES OF THE PACIFIC BROWN SHRIMP PENAEUS-CALIFORNIENSIS .1. PROPERTIES OF AMYLASE ACTIVITY IN THE DIGESTIVE-TRACT

Authors
VEGAVILLASANTE F NOLASCO H CIVERA R
Citation
F. Vegavillasante et al., THE DIGESTIVE ENZYMES OF THE PACIFIC BROWN SHRIMP PENAEUS-CALIFORNIENSIS .1. PROPERTIES OF AMYLASE ACTIVITY IN THE DIGESTIVE-TRACT, Comparative biochemistry and physiology. B. Comparative biochemistry, 106(3), 1993, pp. 547-550
Citations number
15
Categorie Soggetti
Biology
Journal title
Comparative biochemistry and physiology. B. Comparative biochemistry → ACNP
ISSN journal
03050491
Volume
106
Issue
3
Year of publication
1993
Pages
547 - 550
Database
ISI
SICI code
0305-0491(1993)106:3<547:TDEOTP>2.0.ZU;2-Y
Abstract
1. Crude extract of the whole digestive tract from the brown shrimp (P . californiensis) was investigated for digestive amylase activity. 2. Considerable amylase activity was found at pH 6.5-8.0, with optimum pH at around 7.5. 3. Optimum temperature was. found between 30-40-degree s-C, similar to amylases from other crustaceans. 4. Amylase activity w as highly halotolerant, having 50% maximum activity at 3 M NaCl. 5. Ma ximum amylase activity was found at 0.01 M NaCl. 6. Amylase activity w as partially inhibited by the divalent ions Hg2+, Zn2+, Cu2+ and Cr+. 7. Mg2+ and Ca2+ ions seemed to enhance amylase activity.