Effects of freezing duration, temperature and storage conditions on accumulation (distribution and redistribution) of trace elements in different tissues of two shrimp species from the Persian Gulf
This study investigates the distribution of three trace elements (Cd, Cu and Zn) in tissues (exoskeleton, abdominal muscle and hepatopancreas) of two shrimp species (Penaeus merguiensis and Penaeus semisulcatus). Special emphasis in this study was placed on evaluating the effects of storage conditions on redistribution of the elements and moreover, the potential roles of metallothionein in tissue redistribution. The specimens were collected from the northern part of Persian Gulf during August 2001 and September 2002. The concentrations of metals in the tissues were measured using an Inductively Coupled Plasma-Atomic Emission Spectrophotometer (ICP-AES) and an ICP-Mass Spectrometer (ICP-MS). Metallothionein levels were determined using Differential Pulse Polarography. Results show a similar hierarchy for Cd and Cu concentrations among different tissues as follows: hepatopancreas> exoskeleton> muscle; and for Zn, the hepatopancreas again contained the highest levels, though there were not any significant differences in Zn concentrations between muscle and exoskeleton. Significant differences were found between the species in the case of Cd and Zn concentrations. Cd and Zn levels in P. semisulcatus were markedly higher than in P. merguiensis. In general, there were highly significant differences among the storage conditions from accumulation the selected trace elements and metallothionein in both species point of view, but in most cases no significant differences could be observed among the fresh, refrigerated and frozen specimens of P. semisulcatus. In regards to Zn and Cu accumulation in edible (muscle) tissues of P. merguiensis, optimum conditions for frozen storage is -30ºC as ice frozen, and in terms of short term storage, one day refrigeration is recommended. The redistribution of Zn and Cu during the storage period can be attributed to the role of metallothionein in their transport from organ(s) to muscle during storage. The variations in pH values measured in the muscle of P. merguiensis in different storage conditions showed a similar trend with metallothionein, Zn and Cu. In contrast it appears that cadmium is transported from muscle to the other tissues. Exoskeleton is probably one of the recipient tissues of cadmium. The inter-elemental relationships were assessed for each species, separately. A significant positive relationship was observed between the concentrations of Zn and metallothionein in P. semisulcatus, whereas in P. merguiensis, Cd concentrations decreased significantly with increasing metallothionein. Highly significant differences between the sexes in Cu and Zn contents could be detected. Highly significant size-related differences were found in the levels of Cd, Cu and metallothionein in the selected tissues of the shrimp species. Comparison between the mean concentrations of the elements in muscle tissue and existing guidelines indicate that in nearly all cases the concentrations were well below permissible levels for human consumption. The only exception was observed regarding mean values of Cd, which was somewhat greater than some of the recommended levels.
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Language: | Persian |
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Iranian Fisheries Science Research Institute
2005
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Subjects: | Heavy metals, Distribution, Redistribution, Shrimp, Metallothionein, Storage conditions, Tissues, |
Online Access: | http://hdl.handle.net/1834/14162 |
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dig-aquadocs-1834-141622021-05-19T06:52:01Z Effects of freezing duration, temperature and storage conditions on accumulation (distribution and redistribution) of trace elements in different tissues of two shrimp species from the Persian Gulf Pourang, N. Ghroughi, A. Ghourchian, H. Heavy metals Distribution Redistribution Shrimp Metallothionein Storage conditions Tissues This study investigates the distribution of three trace elements (Cd, Cu and Zn) in tissues (exoskeleton, abdominal muscle and hepatopancreas) of two shrimp species (Penaeus merguiensis and Penaeus semisulcatus). Special emphasis in this study was placed on evaluating the effects of storage conditions on redistribution of the elements and moreover, the potential roles of metallothionein in tissue redistribution. The specimens were collected from the northern part of Persian Gulf during August 2001 and September 2002. The concentrations of metals in the tissues were measured using an Inductively Coupled Plasma-Atomic Emission Spectrophotometer (ICP-AES) and an ICP-Mass Spectrometer (ICP-MS). Metallothionein levels were determined using Differential Pulse Polarography. Results show a similar hierarchy for Cd and Cu concentrations among different tissues as follows: hepatopancreas> exoskeleton> muscle; and for Zn, the hepatopancreas again contained the highest levels, though there were not any significant differences in Zn concentrations between muscle and exoskeleton. Significant differences were found between the species in the case of Cd and Zn concentrations. Cd and Zn levels in P. semisulcatus were markedly higher than in P. merguiensis. In general, there were highly significant differences among the storage conditions from accumulation the selected trace elements and metallothionein in both species point of view, but in most cases no significant differences could be observed among the fresh, refrigerated and frozen specimens of P. semisulcatus. In regards to Zn and Cu accumulation in edible (muscle) tissues of P. merguiensis, optimum conditions for frozen storage is -30ºC as ice frozen, and in terms of short term storage, one day refrigeration is recommended. The redistribution of Zn and Cu during the storage period can be attributed to the role of metallothionein in their transport from organ(s) to muscle during storage. The variations in pH values measured in the muscle of P. merguiensis in different storage conditions showed a similar trend with metallothionein, Zn and Cu. In contrast it appears that cadmium is transported from muscle to the other tissues. Exoskeleton is probably one of the recipient tissues of cadmium. The inter-elemental relationships were assessed for each species, separately. A significant positive relationship was observed between the concentrations of Zn and metallothionein in P. semisulcatus, whereas in P. merguiensis, Cd concentrations decreased significantly with increasing metallothionein. Highly significant differences between the sexes in Cu and Zn contents could be detected. Highly significant size-related differences were found in the levels of Cd, Cu and metallothionein in the selected tissues of the shrimp species. Comparison between the mean concentrations of the elements in muscle tissue and existing guidelines indicate that in nearly all cases the concentrations were well below permissible levels for human consumption. The only exception was observed regarding mean values of Cd, which was somewhat greater than some of the recommended levels. Iranian Fisheries Science Research Institute Published 2018-08-27T08:47:36Z 2018-08-27T08:47:36Z 2005 Report Refereed http://hdl.handle.net/1834/14162 fa Without No 11; 50pp. Iran Persian Gulf Iranian Fisheries Science Research Institute Tehran, Iran |
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Heavy metals Distribution Redistribution Shrimp Metallothionein Storage conditions Tissues Heavy metals Distribution Redistribution Shrimp Metallothionein Storage conditions Tissues |
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Heavy metals Distribution Redistribution Shrimp Metallothionein Storage conditions Tissues Heavy metals Distribution Redistribution Shrimp Metallothionein Storage conditions Tissues Pourang, N. Ghroughi, A. Ghourchian, H. Effects of freezing duration, temperature and storage conditions on accumulation (distribution and redistribution) of trace elements in different tissues of two shrimp species from the Persian Gulf |
description |
This study investigates the distribution of three trace elements (Cd, Cu and Zn) in
tissues (exoskeleton, abdominal muscle and hepatopancreas) of two shrimp species
(Penaeus merguiensis and Penaeus semisulcatus). Special emphasis in this study was
placed on evaluating the effects of storage conditions on redistribution of the elements
and moreover, the potential roles of metallothionein in tissue redistribution. The
specimens were collected from the northern part of Persian Gulf during August 2001
and September 2002. The concentrations of metals in the tissues were measured using
an Inductively Coupled Plasma-Atomic Emission Spectrophotometer (ICP-AES) and
an ICP-Mass Spectrometer (ICP-MS). Metallothionein levels were determined using
Differential Pulse Polarography. Results show a similar hierarchy for Cd and Cu
concentrations among different tissues as follows: hepatopancreas> exoskeleton>
muscle; and for Zn, the hepatopancreas again contained the highest levels, though
there were not any significant differences in Zn concentrations between muscle and
exoskeleton. Significant differences were found between the species in the case of Cd
and Zn concentrations. Cd and Zn levels in P. semisulcatus were markedly higher
than in P. merguiensis. In general, there were highly significant differences among the
storage conditions from accumulation the selected trace elements and metallothionein
in both species point of view, but in most cases no significant differences could be
observed among the fresh, refrigerated and frozen specimens of P. semisulcatus. In
regards to Zn and Cu accumulation in edible (muscle) tissues of P. merguiensis,
optimum conditions for frozen storage is -30ºC as ice frozen, and in terms of short
term storage, one day refrigeration is recommended. The redistribution of Zn and Cu
during the storage period can be attributed to the role of metallothionein in their
transport from organ(s) to muscle during storage. The variations in pH values
measured in the muscle of P. merguiensis in different storage conditions showed a
similar trend with metallothionein, Zn and Cu. In contrast it appears that cadmium is
transported from muscle to the other tissues. Exoskeleton is probably one of the
recipient tissues of cadmium. The inter-elemental relationships were assessed for each
species, separately. A significant positive relationship was observed between the
concentrations of Zn and metallothionein in P. semisulcatus, whereas in P.
merguiensis, Cd concentrations decreased significantly with increasing
metallothionein. Highly significant differences between the sexes in Cu and Zn
contents could be detected. Highly significant size-related differences were found in
the levels of Cd, Cu and metallothionein in the selected tissues of the shrimp species.
Comparison between the mean concentrations of the elements in muscle tissue and
existing guidelines indicate that in nearly all cases the concentrations were well below
permissible levels for human consumption. The only exception was observed
regarding mean values of Cd, which was somewhat greater than some of the
recommended levels. |
format |
Report |
topic_facet |
Heavy metals Distribution Redistribution Shrimp Metallothionein Storage conditions Tissues |
author |
Pourang, N. Ghroughi, A. Ghourchian, H. |
author_facet |
Pourang, N. Ghroughi, A. Ghourchian, H. |
author_sort |
Pourang, N. |
title |
Effects of freezing duration, temperature and storage conditions on accumulation (distribution and redistribution) of trace elements in different tissues of two shrimp species from the Persian Gulf |
title_short |
Effects of freezing duration, temperature and storage conditions on accumulation (distribution and redistribution) of trace elements in different tissues of two shrimp species from the Persian Gulf |
title_full |
Effects of freezing duration, temperature and storage conditions on accumulation (distribution and redistribution) of trace elements in different tissues of two shrimp species from the Persian Gulf |
title_fullStr |
Effects of freezing duration, temperature and storage conditions on accumulation (distribution and redistribution) of trace elements in different tissues of two shrimp species from the Persian Gulf |
title_full_unstemmed |
Effects of freezing duration, temperature and storage conditions on accumulation (distribution and redistribution) of trace elements in different tissues of two shrimp species from the Persian Gulf |
title_sort |
effects of freezing duration, temperature and storage conditions on accumulation (distribution and redistribution) of trace elements in different tissues of two shrimp species from the persian gulf |
publisher |
Iranian Fisheries Science Research Institute |
publishDate |
2005 |
url |
http://hdl.handle.net/1834/14162 |
work_keys_str_mv |
AT pourangn effectsoffreezingdurationtemperatureandstorageconditionsonaccumulationdistributionandredistributionoftraceelementsindifferenttissuesoftwoshrimpspeciesfromthepersiangulf AT ghroughia effectsoffreezingdurationtemperatureandstorageconditionsonaccumulationdistributionandredistributionoftraceelementsindifferenttissuesoftwoshrimpspeciesfromthepersiangulf AT ghourchianh effectsoffreezingdurationtemperatureandstorageconditionsonaccumulationdistributionandredistributionoftraceelementsindifferenttissuesoftwoshrimpspeciesfromthepersiangulf |
_version_ |
1756076546826698752 |