Animal physiology
Mousa Keshavarz; Jamileh Pazooki
Abstract
Chitin is found in the exoskeleton of many invertebrates, the cell wall of most fungi and some algae which is converted into chitosan through some reactions. Chitosan is a combined polymer of glucosamine and N-acetylglucosamine, linked by 1 and 4 glycosidic bonds. In this article, the structural and ...
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Chitin is found in the exoskeleton of many invertebrates, the cell wall of most fungi and some algae which is converted into chitosan through some reactions. Chitosan is a combined polymer of glucosamine and N-acetylglucosamine, linked by 1 and 4 glycosidic bonds. In this article, the structural and physicochemical characteristics of chitosan extracted from the shell wastes of of shrimp species Penaeus merguiensis and squid shells Sepia pharaonis have been compared. Samples were collected from the coast of Bandar Abbas and in order to extract chitin and chitosan, their physicochemical characteristics were measured using FTIR, XRD, and SEM methods. The molecular weight of chitosan samples obtained from the shell of Banana prawn and Pharaoh Cuttlefish was calculated as 26,000 and 14,000 kDa, respectively, and the deacetylation percentage of chitosan in P. merguiensis and S. pharaonis was calculated as 66% and 30.5%, respectively. The findings showed that micrographs of the shrimp shell are heterogeneous and non-flat and in the form of broken rod-shaped structures, and the surface morphology of chitosan prepared from Cuttlefish shell showed a smooth surface with few larger and stone-like structures on it. In recent years, the scientific community has increased its attention to chitosan products derived from marine wastes for this biopolymer, and this study indicated that, given the large volume of marine waste produced in Bandar Abbas, and taking into account environmental considerations, efforts were made to extract chitosan derivatives from marine waste.
Ali Akbar Tafi; Saeed Meshkini
Volume 4, Issue 1 , September 2015, , Pages 35-44
Abstract
Abstract
In this study 900 rainbow trout (mean weight 25 gr) were obtained from a local fish farm in Urmia city and after acclimatization for 10 days, the fish were randomly divided into four groups (with three replication) and fed for 8 weeks with 0 (control), 2.5, 5 and 10 g chitosan/kg feed, respectively. ...
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Abstract
In this study 900 rainbow trout (mean weight 25 gr) were obtained from a local fish farm in Urmia city and after acclimatization for 10 days, the fish were randomly divided into four groups (with three replication) and fed for 8 weeks with 0 (control), 2.5, 5 and 10 g chitosan/kg feed, respectively. Finally treatments were fed the control diet (without any chitosan) for another 3 weeks. Body weight, total length, food conversion rate, Special Growth Rate, Condition Factor and Daily weight gain were determined every two weeks and at the end of the trial. Data were analyzed using SPSS ver. 20. Results depicted no positive effects of chitosan on growth and nutritional parameters of rainbow trout. However, treatment four considerably (10 g chitosan/kg feed) inhibited live weight gain, total length increment and deteriorated food conversion rate (FCR) and specific growth rate (SGR) in comparison to control group and third treatment (5 g chitosan/kg feed).
