• 제목/요약/키워드: Antarctic krill

검색결과 46건 처리시간 0.026초

A Possible Explanation for the Dominance of Chlorophyll in Pico and Nano-size Fractions in the Waters Around the South Shetland Islands

  • Kawaguchi, So;Shiomoto, Akihiro;Imai, Keiri;Tsarina, Yoriko;Yamaguchi, Hitomi;Noiri, Yoshifumi;Iguchi, Naoki;Kameda, Takahiko
    • Ocean and Polar Research
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    • 제23권4호
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    • pp.379-388
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    • 2001
  • Ch1 a abundance, Ch1 a-specific productivity and phytoplankton growth rate in each size fraction (pico, $<2{\mu}m$; nano, $2-10{\mu}m$; micro, > $10{\mu}m$) in the waters around the South Shetland Islands (Ant-arctic Peninsula Area) were analysed. Although Ch1 a-specific productivity and growth rate were highest in micro-size fractions, ChI a abundance was highest in pico-size fractions. Selective removal of nano- and micro-size phytoplankton especially by krill and salp grazing, but not limitation of phytoplankton growth, seemed to be the major reason to explain this miss match between productivity and abundance of the phytoplankton community.

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Antioxidant and Cholinesterase Inhibitory Activities of Antarctic Krill Eupausia superba

  • Yoon, Na-Young;Xie, Chengliang;Shim, Kil-Bo;Kim, Yeon-Kye;Lee, Doo-Seog;Yoon, Ho-Dong
    • Fisheries and Aquatic Sciences
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    • 제14권4호
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    • pp.289-293
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    • 2011
  • The antioxidant and cholinesterase inhibitory activities of methanol, pretanol, and acetone extracts of Eupausia superba were investigated and their bioactivities compared. The 2,2-diphenyl-1-picrylhydrazyl (DPPH) and 2,2'-azino-bis[3-ethylbenzthiazoline-6-sulfonic acid] ($ABTS^+$) radical-scavenging activities and reducing power assays were used to determine antioxidant activities, and Ellman's colorimetric methods were applied to evaluate cholinesterase inhibitory activity. Although all extracts were positive, Acetone extract of E. superba showed the highest activities. However, these showed moderate or no inhibitory activity against butyrylcholinesterase. Moreover, the total carotenoid contents of the organic solvent extracts followed the same order as their antioxidant and acetylcholinesterase inhibitory activities. These results suggest that E. superba is a potential source of natural antioxidants and cholinesterase inhibitors.

크릴간장 제조(製造)에 관한 연구(硏究) (Studies on the Processing of Krill Sauce)

  • 이응호;조순영;차용준;박향숙;권칠성
    • 한국식품영양과학회지
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    • 제13권1호
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    • pp.97-106
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    • 1984
  • 남대양(南大洋)에 다량 서식하고 있는 중요한 단백질자원(蛋白質資源)인 크릴을 보다 유효하게 식량(食糧)으로 이용하기 위한 방안의 하나로 크릴을 원료로 하여 그 자체에 존재하는 활성이 높은 자가소화효소(自家消化酵素)나 단백질분해효소(蛋白質分解酵素)로써 크릴간장 제조(製造)를 시도(試圖)하였다. 마쇄한 크릴에 동량(同量)의 물을 첨가하여 가수분해(加水分解)시킬 때의 최적가수분해조건(最適加水分解條件) 및 저장안정성(貯藏安定性)을 검토(檢討)하고 아울려 제품의 정미성분(呈味成分)을 분석(分析)하였다. 자가소화(自家消化)에 의한 경우와 bromelain, complex enzyme을 첨가한 시료(試料) 모두 $52.5^{\circ}C$에서 최대활성을 나타내었고, 분해시간(分解時間)은 3시간(時間)이 적합하였으며, 효소농도(醴素濃度)는 bromelain의 경우 0.5 %, complex enzyme은 5%가 가장 좋았다. 그리고 pH는 자가소화(自家消化)나 complex enzyme을 첨가하여 분해(分解)하였을 경우는 7.0${\sim}$7.5, bromelain을 첨가하여 분해(分解)하였을 때는 6.5부근에서 가장 활성이 높았다. 이와 같은 최적가수부해조건(最適加水分解條件)에서 크릴을 자가소화(自家消化)시킨 후 $100^{\circ}C$, 20 분간(分間) 불활성화한 다음 여과한 가수분해물(加水分解物)에 식염(食鹽)(10 %)과 벤조산(0.06%)이나 알코올(3 %)을 첨가하여 멸균한 유리병에 밀봉(貯減)한 결과 $37^{\circ}C$에서 한달간 저장(貯藏)하여도 화학적, 미생물적 및 관능적으로 안정하였다. 또한 관능적인 맛으로 보아 식염(食鹽) 10 % 중 5 % 정도까지는 나트륨염(鹽) 대신 칼륨염(鹽)을 대체 첨가할 수 있었다. 크릴간장의 단백질가수분해율(蛋白質加水分解率)은 자가소화법(自家消火法)인 경우 83.2%, bromelain 첨가구는 89.7%, complex enzyme 첨가구는 92.7 %이었다. 자가소화법(自家消化法), bromelain 또는 complex enzyme첨가에 의해 제조(製造) 된 크릴간장의 유리(遊離)아미노산(酸) 중 함량이 많은 것은 lysine, arginine, leucine, proline, alanine 및 valine으로서 전 유리(遊離)아미노산(酸)에 대해 각각 58.8 %, 56.0 %, 55.3 %를 차지하였다. 그리고 전엑스분망(分望) 소(素)에 대하여 유리(遊離)아미노산(酸)이 차지하는 비율은 각각 67.4 %,69.4%, 69.8 %이었다. 핵산관련물질(核酸關聯物質) 중 함량이 가장 많은 것은 hypoxanthine이었고, 다음이 5’-IMP였다. TMAO, betaine, 총 creatinine은 함량이 적었다. 관능검사결과(官能檢査結果) 자가소화(自家消化)시킨 크릴간장은 효소(酵素)처리한 것이나 재래식 콩간장에 비하여 품질 면에서 손색이 없고 저장성(貯藏性)이 좋은 크릴간장을 제조(製造)할 수 있다는 결론을 얻었다.

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남빙양산(南氷洋産) 크릴단백질(蛋白質)의 추출조건(抽出條件) (Factors Affecting the Extraction of Protein from Antarctic Krill)

  • 이성기;김영명;민병용
    • 한국식품과학회지
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    • 제17권2호
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    • pp.65-70
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    • 1985
  • 남빙양산(南氷洋産) 크릴을 식품소재(食品素材)로 이용(利用)하기 위한 기초적 연구(硏究)의 일환으로 단백질(蛋白質) 추출실험(抽出實驗)을 실시(實施)하여 다음과 같은 결과를 얻었다. 즉 단백질(蛋白質) 추출시(抽出時) 용해도(溶解度)는 pH $4.0{\sim}4.5$일때가 $33.2{\sim}38.8%$로 최저수준(最低水準)을 보였으며 PH 4.0이하에서는 pH가 저하(低下)할수록, pH 4.5 이상에서는 pH가 증가(增加)할수록 단백질(蛋白質) 추출률(抽出率)이 크게 증가(增加)하여 pH 2.0에서는 56.8% pH 11.0에서는 80.7%의 추출률(抽出率)을 보여 산(酸)보다 알칼리 추출(抽出)이 더 효과적(效果的)이었다. 추출용매량(抽出溶媒量) 대(對) 크릴중량(重量)의 비율(比律)에 있어서는 용매량(溶媒量)이 증가(增加)할수록 추출률(抽出率)이 높았고 온도변화(溫度變化)에 따른 영향은 적었다. 또한 추출처리시간별(抽出處理時間別) 단백질(蛋白質)의 추출률(抽出率)은 추출초기(抽出初期)에 급격히 증가(增加)하였고 30분(分)이후 부터는 극히 완만하게 증가하였다. 한편 크릴단백질(蛋白質)의 추출(抽出)에 미치는 염화(鹽化)나트륨 첨가(添加)의 영향은 pH 2.0 및 pH 11.0의 용매(溶媒)에 염화(鹽化)나트륨을 $1{\sim}6%$의 농도(濃度)가 되도록 첨가(添加)하여 단백질(蛋白質)을 추출(抽出)한 결과(結果) pH 11.0의 추출률(抽出率)이 $81.0{\sim}84.1%$로 pH 2.0의 $39.1{\sim}42.9%$ 보다 훨씬 높았으며 동일(同一)한 pH조건(條件)에서는 염화(鹽化)나트륨의 농도(濃度)가 증가(增加)할수록 추출률(抽出率)이 감소하는 경향을 보였다. 또한 인산염용액에 의한 크릴단백질의 추출효과(抽出效果)는 $3{\sim}4%$의 sodium phosphate, tribosic 이나 sodium pyrophosphate 용액(溶液)의 추출률(抽出率)이 80% 이상으로 매우 높았다.

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갑각류부산물을 이용한 키틴의 제조 및 이용에 관한 연구 1. 키틴, 키토산 및 미세결정화 키틴의 기능특성 (Utilization of Chitin Prepared from the Shellfish Crust 1. Functional Properties of Chitin, Chitosan, and Microcrystalline Chitin)

  • 안창범;이응호
    • 한국수산과학회지
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    • 제25권1호
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    • pp.45-50
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    • 1992
  • 폐기되고 있는 수산부산물을 유효하게 이용하여 식품산업의 학술적 자료를 얻을 목적으로 6종의 갑각류의 갑각을 회수하여 키틴, 키토산 및 미세결정화키틴을 제조하여 이들 성간의 기능특성에 대해 검토하였다. 제조된 키틴, 키토산 및 미세결정화키틴들의 겉보기체적, 수중침정체적, 보수력 및 지방흡수력은 각각 $3.1\pm0.1-27.0\pm0.2ml/g,\;5.1\pm0.1-45.0\pm0.2ml/g,\;318\pm40-2,382\pm12g/100g$$235\pm20-2,169\pm20g/100g$의 범위였고 크릴껍질로 만든 키틴과 키토산의 겉보기체적, 수중침정체적, 보수력 및 지방흡수력이 가장 컸다 키틴과 키토산은 유화성이 없었고 미세결정화키틴만이 유화성이 있었다. 5종의 미세결정화키틴의 유화성은 $18.2\pm4.0-50.1\pm2.5\%$, 유화 안정성은 $15.2\pm3.5-31.1\pm1.0\%$의 범위였다. 색소흡착능은 붉은대게의 각피로 제조된 미세결정화키틴이 가장 좋았다.

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한국수산업의 해외진출전략에 관한 연구 (Foreign Entry Strategies for Korean Fishery Firms)

  • 김회천
    • 수산경영론집
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    • 제15권1호
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    • pp.131-153
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    • 1984
  • Fishery resources are still abundant compared with other resources and the possibility of exploitation is probably great. The Korean fishery industry has grown remarkably since 1957, and Korea is ranked as one of the major fishery countries. Its of fishery products reached the 9th in the world and the value of exports was 5th in 1982. But recently a growth rate has slowed down, due to the enlargement of territorial seas by the declaration of the 200 mile, Exclusive Economic Zone, the tendency to develop fishery resources strate-gically in international bargaining, the change in function of the international organizations, the expansion of regulated waters, the illegal arrest of our fishing boats, the rapid rise in oil prices, and the fall in fish prices, the development of fishery resources as a symbol of nationalism, the fishing boats decreptitude, the rise of crew wages, regulations on fishing methods, fish species, fishing season, size of fish, and mesh size, fishing quotas and the demand of excessive fishing royalties. Besides the the obligation of coastal countries, employing crews of their host countries is also an example of the change in the international environment which causes the aggravation of foreign profit of fishing firms. To ameliorate the situation, our Korean fishery firms must prepare efficient plans and study systematically to internationalize themselves because such existing methods as conventional fishing entry and licence fishing entry are likely to be unable to cope with international environmental change. Thus, after the systematic analysis of the problem, some new combined alternatives might be proposed. These are some of the new schemes to support this plan showing the orientation of our national policy: 1. Most of the coastal states, to cope with rapid international environmental change and to survive in the new era of ocean order, have rationalized their higher governmental structure concerning the fishery industries. And the coastal countries which are the objectives of our expecting entry, demand excessive economic and technical aid, limit the number of fishing boats’entry and the use of our foreign fishing bases, and regulate the membership of the international fishery commissions. Especially, most of the coastal or island countries are recently independent states, which are poorer in national budget, depend largely on fishing royalties and licence entry fees as their main resources of national finance. 2. Alternatives to our entry to deep sea fishing, as internationalization strategies, are by direct foreign investment method. About 30 firms have already invested approximately US $ 8 million in 9 coastal countries. Areas of investment comprise the southern part of the Atlantic Ocean, the Moroccan sea and five other sea areas. Trawling, tuna purse seining and five other fields are covered by the investment. Joint-venture is the most prominent method of this direct investment. If we consider the number of entry firms, the host countries, the number of seas available and the size of investment, this method of cooperation is perhaps insufficient so far. Our fishery firms suffer from a weakness in international competitive ability, an insufficiency of information, of short funds, incompetency in the market, the unfriendliness of host coastal countries, the incapability of partners in joint-ventures and the political instability of the host countries. To enlarge our foreign fishing grounds, we are to actively adopt the direct investment entry method and to diversity our collaboraboration with partner countries. Consequently, besides proper fishing, we might utilize forward integration strategies, including the processing fied. a. The enterprise emigration method is likely to be successful in Argentina. It includes the development of Argentinian fishing grounds which are still not exploited in spite of abundant resources. Besides, Arentina could also be developed as a base for the exploitation of the krill resources and for further entries into collaboration with other Latin American countries. b. The co-business contract fishing method works in American territorial seas where American fishermen sell their fishery products to our factory ships at sea. This method contributes greatly to obtaining more fishing quotas and in innovation bottom fishing operation. Therefore we may apply this method to other countres to diffuse our foreign fishing entry. c. The new fishing ground development method was begun in 1957 by tuna long-line experimental fishing in the Indian Ocean. It has five fields, trawling, skipjack pole fishing and shrimp trawling, and so on. Recently, Korean fisheries were successful in the development of the Antarctic Ocean krill and tuna purse seining. 3. The acceleration of the internationalization of deep sea fishing; a. Intense information exchange activities and commission participation are likely to be continues as our contributions to the international fishery organizations. We should try to enter international fishery commissions in which we are not so far participating. And we have to reform adequately to meet the changes of the function of the international commissions. With our partner countries, we ought to conclude bilateral fishery agreements, thus enlarging our collaboration. b. Our government should offer economic and technical aids to host countries to facilitate our firms’fishery entry and activities. c. To accelerate technical innovation, our fishery firms must invest greater amount in technical innovation, at the same time be more discriminatory in importing exogeneous fishery technologies. As for fishing methods; expanded use of multi-purpose fishing boats and introduction of automation should be encuraged to prevent seasonal fluctuations in fishery outputs. d. The government should increases financial and tax aid to Korean firms in order to elevate already weak financial structure of Korean fishery firms. e. Finally, the government ought to revise foreign exchange regulations being applied to deep sea fishery firms. Furthermore, dutes levied on foreign purchaed equipments and supplies used by our deep sea fishing boats thould be reduced or exempted. when the fish caught by Korean partner of joint-venture firms is sold at the home port, pusan, import duty should be exempted.

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