TY - JOUR AU - Thu, Nguyen Xuan AU - Lan Oanh, Le Thi AU - Dinh, Tran Canh PY - 2014/11/12 Y2 - 2024/03/29 TI - Isolation and some properties of tyrosinase from Symplectoteuthis oualaniensis JF - Academia Journal of Biology JA - AJB VL - 30 IS - 2 SE - Articles DO - 10.15625/0866-7160/v30n2.5427 UR - https://vjs.ac.vn/index.php/vjbio/article/view/5427 SP - 71-76 AB - <p>Tyrosinase is the key enzim in the reaction chain of melanin biosynthesis, which causes the enzymatic darkening of <em>S. oualaniensis</em> after being caught. We have extracted and investigated some agents, which were used to inhibit the activity of tyrosinase extracted from <em>S. oualaniensis</em>. The results showed that tyrosinase from <em>S. oualaniensis</em> had the optimal pH from 6.5 - 7.0. When being temperature treated for 5 minutes at 70 - 80<sup>o</sup>C, its activity was 65 - 30% of the original and at 100<sup>o</sup>C, it was inactive. Ascorbic acid, NaHSO<sub>3</sub>, EDTA and extracts of ST and NS were inhibitors of <em>S. oualaniensis</em> tyrosinase. Treating for 5 minutes, 10 mM ascorbic acid inhibited 68% and EDTA - 97%, 100 mM of NaHSO<sub>3</sub> inhibited 57%, ST 73% and NS 33% <br /> <em>S. oualaniensis</em> tyrosinase activity.</p> ER -