• Title/Summary/Keyword: salted and dried yellow corvenia(Gulbi)

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The Effect of Processing Conditions of the Salted and Dried Yellow Corvenia(Gulbi) on n-Nitrosamine(NA) Formation during Its Processing 1. Changes of Amines, Nitrate and Nitrite in the Salted and Dried Yellow Corvenia during Its Processing and Storage (염건조기(굴비)의 가공조건이 n-Nitrosamine(NA)의 생성에 미치는 영향 -1보. 염건조기의 가공.저장중 아민류, 질산염 및 아질산업의 변화-)

  • 이수정;신정혜;김정균;성낙주
    • The Korean Journal of Food And Nutrition
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    • v.11 no.4
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    • pp.444-451
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    • 1998
  • The changes of amine, nitrate and nitrite nitrogen in yellow corvenia were studied during its processing and storage in order to clarify the precursors of N-nitrosamine(NA) formation in the salted and dried yellow corvenia(Gulbi), prepared y using the different salting method like dry and brine salting by pure and curde salt. As a result, during the processing and storage of Gulbi, DMA and TMA contents were significantly increased in the yellow corvenia. And after 40 days storage the increase rate showed 25.7∼45.7, 3.3∼5.6 times higher than those of 0.3, 2.4mg/kg, respectively, while nitrite contents, during its processing and storage, were scarcely changed in the salted and dried yellow corvenia. During the processing and storage, of Gulbi, DMA and TMA contents were less produced in brine salted and dried yellow corvenia using crude salt than in sample prepared using were scarcely changed in the salted and dried yellow corvenia. During the processing and storage of Gulbi, DMA and TMA contents were less produced in brine salted and dried yellow corvenia using crude salt than in sample prepared using pure salt, while the former were more effective than the latter in inhibiting the production of nitrate and nitrite. Therefore, it was revealed that reduction of NA precursors such as DMA, TMA, nitrate and nitrite were more effective in preparing with the brine salting method than with the dry salting method.

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The Effect of Processing Condition of the Salted and Dried Yellow Corvenia (Gulbi) on n-Nitrosamine(NA) Formation during Its Processing 2. Changes of NA in Salted and Dried Yellow Corvenia during Its Processing and Storage (염건조기(굴비)의 가공조건이 n-Nitrosamine(NA)의 생성에 미치는 영향 -2보. 염건조기의 가공 및 저장중 NA의 변화-)

  • 이수정;신정혜;소명환;성낙주
    • The Korean Journal of Food And Nutrition
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    • v.11 no.4
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    • pp.452-459
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    • 1998
  • In 7 kinds of Gulbi purchansed from Yosu, Sunchon and Chinju, N-nitrosamine (NA) such as N-nitrosodimethylamine (NDMA), N-nitrosodiethylamine (NDEA) and N-nitrosodipropylamine(NDPA), were detected and their content was 2.8∼78.3$\mu\textrm{g}$/kg, trace and 0∼1.4$\mu\textrm{g}$/kg, respectively. This experiment was conducted to study the effect of processing conditions on NA formation in the salted and dried yellow corvenia(Guibi), prepared by using the different salting method like dry and brine salting by pure and crude salt. NDMA, NDEA and NDPA were not detected in raw sample, but NDMA content increased in yellow corvenia during its salting (27.6∼37.4$\mu\textrm{g}$/kg), and then drastically decreased in Gulbi stored for 40 days, ranging from 2.8 to 4.3$\mu\textrm{g}$/kg. Content of above NA was inhibited more effectively in the samples prepare with brine salting method than with the dry salting method during its processing and storage. Especially, NA in the sample prepared with brine salted and dried yellow corvenia using the pure salt was detected in the lower concentrations, and that of NDMA, NDEA and NDPA was 2.8∼27.6, trance and ND-2.7$\mu\textrm{g}$/kg, respectively.

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The Formation of N-nitrosamine in yellow Corvenia During its Processing (굴비 가공중 N-nitrosamine의 생성)

  • 성낙주;이수정;정미자
    • Journal of Food Hygiene and Safety
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    • v.12 no.2
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    • pp.125-131
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    • 1997
  • Gulbi, salted and dried yellow corvenia, is a favorite diet food in Korea from the ancient times. A Few studies have dealt with sanitary concerns related to its products, while a number of investigators studied its taste compounds. This study attemps to establish the basic data for ensuring the safety of Gulbi. The contents of nitrate and nitrite were detected 1.2 and <0.1 mg/kg in raw sample, but their contents were detected 3.6~3.9 and 1.2~2.0 mg/kg during its processing and storage of Gulbi, respectively. TMAO contents decreased while betaine, TMA, DMA and formaldehyde increased in yellow corvenia during its processing and storage. Recovery from raw, salted, salt-dried and stored sample spiked with 10$\mu\textrm{g}$/kg for NDBA was 83.2~102.7% average 92.7%). N-nitrosamine such as NDMA, NDEA and NDPA was not detected in raw sample and drastically increased during Gulbi processing and storage. The levels of NDMA, NDEA and NDPA in Gulbi stored for 30 days were about 2.7,4.5 and 5.3 times higher than those in salted sample, respectively. Regardless of cooking methods, NDMA, NDEA and NDPA during cooking when sample were cooked using direct heating methods such as a gas and a briquet fire than when sample were cooked using indirect methods such as an microwave oven and a fried pan. Indirect cooking methods was effective to minimize the N-nitrosamine formation such as NDMA, NDEA and NDPA during cooking of Gulbi.

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Quality Characteristics of Vacuum-Dried Gulbi Based on Temperature and Time (온도와 시간에 따른 진공건조 굴비의 품질특성)

  • Park, Hyun Su;Hyun, Myung-Taek;Lee, Ju-Hee;Kim, Dae Young;Lee, Khan;Kim, Hyun Jung
    • Korean journal of food and cookery science
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    • v.33 no.3
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    • pp.316-324
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    • 2017
  • Purpose: Gulbi is a salted and dried yellow corvenia that is popular in Korea. In this study, yellow corvenia was vacuum-dried under two different conditions, average temperatures of $48^{\circ}C$ for 12 and 15 h and $54^{\circ}C$ for 9 and 12 h. Quality characteristics of vacuum-dried Gulbi against fresh corvenia were investigated. Methods: Moisture content, water activity, salt concentration, pH, acidity, volatile basic nitrogen (VBN), thiobarbituric acid-reactive substances (TBARS), and fatty acid composition of Gulbi were evaluated. Results: Moisture contents of fresh corvenia and four types of vacuum-dried Gulbi were 67.37, 31.51, 13.62, 35.17, and 10.05%, respectively. The pH values were in the range of pH 6.70-6.98. The VBN values of Gulbi vacuum-dried at the higher temperature range were greater than those of Gulbi at the lower temperature range. The TBARS of Gulbi increased after vacuum drying (p<0.05). Palmitic acid, palmitoleic acid, oleic acid, and docosahexaenoic acid were the main fatty acids of Gulbi. Conclusion: These results indicate that the quality of vacuum-dried Gulbi is dependent on the drying conditions including temperature and time.

The Changes of Malonaldehyde and Fatty Acids Composition of Yellow Corvenia during Gulbi Processing and Storage (굴비의 가공.저장 중 Malonaldehyde 함량 및 지방산 조성 변화)

  • Shin, Jung-Hye;Kwon, O-Chen;Kang, Min-Jung;Choi, Sun-Young;Lee, Soo-Jung;Sung, Nak-Ju
    • The Korean Journal of Food And Nutrition
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    • v.19 no.4
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    • pp.374-380
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    • 2006
  • For the improvement of Gulbi processing, yellow corvenia was salted by 2 different time (5 hours, low salted and 5 days, high salted) and then dried in the sun and stored for 5 and 21 days, respectively. Malonaldehyde contents and fatty acid composition were analyzed during Gulbi processing. The moisture contents of yellow corvenia were significantly decreased during processing procedure. The salt contents were 10 folds higher in 5 day-salted sample than in 5 hour-salted one. The salt contents showed reversed tendency to moisture contents. There was little change in pH during storage. The contents of malonaldehyde in yellow corvenia were increased during Gulbi processing and storage. Its contents were higher in 5 day-salted sample and exterior parts than 5 hour-salted sample and interior parts of Gulbi. The fatty acids composition showed higher oleic acid $(C_{18:1})$, palmitic acid $(C_{16:0})$ and docosahexaenoic acid $(C_{22:6})$ than any other fatty acids in Gulbi. Saturated fatty acids were increased but unsaturated fatty acids were decreased during Gulbi processing. After 21 days storage, unsaturated fatty acids remaining ratio in 5 hour-and 5 day-salted sample were 1.39 and 0.99 respectively. The contents of unsaturated fatty acids were dramatically changed as salt concentration increased during storage than in processing.

Changes in Free Amino Acids of Yellow Corvenia, Pseudosciaena manchurica, during Gulbi Processing (굴비 가공(加工)중의 유리아미노산의 변화)

  • Lee, Eung-Ho;Sung, Nak-Ju;Ha, Jin-Hwan;Chung, Seung-Yong
    • Korean Journal of Food Science and Technology
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    • v.8 no.4
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    • pp.225-229
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    • 1976
  • Gulbi, salted and dried yellow corvenia, is one of widely consuming fish foods in this country. This study was attempted to establish the basic data for evaluating the taste compounds of Gulbi. The free amino acids were analysed by amino acid autoanalyser. In the free amino acid composition of raw yellow corvenia, abundant amino acids were glutamic acid, alanine and lysine and then leucine, glycine, serine and threonine in order. Such amino acids like proline, valine, methionine, tyrosine and phenylalanine were poor in content. The changes of free amino acid composition in the extract of yellow corvenia during Gulbi processing was not observed. In the extract of Gulbi product, glutamic acid, lysine, leucine, alanine and valine were dominant holding 20.0%, 12.9%, 11.1%, 10.1% and 8.5% of total amino acids respectively. The amounts of total free amino acids of yellow corvenia increased more than 3.6 times as compared with that of raw sample during Gulbi processing. It is convinced that the characteristic flavor of Gulbi was attributed to such amino acids like lysine and alanine known as kweet compounds, as glutamic acid with meaty taste, and as leucine known as bitter taste.

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Chemical Changes of Low Salt Gulbi (salted and dried yellow corvenia) during Hot-air Drying with Different Temperatures (저염 굴비 제조 시 열풍건조 온도에 따른 화학적 특성 변화)

  • Gwak, Hyun-Jung;Eun, Jong-Bang
    • Korean Journal of Food Science and Technology
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    • v.42 no.2
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    • pp.147-154
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    • 2010
  • Gulbi, made of fresh yellow corvenia (Psendosciaena manchurica) that has been salted and dried, is one of the most popular traditional marine foods in Korea. The objective of this study was to develop a method to safely manufacture Gulbi with low levels of oxidation and contamination, by a hot air drying method. Changes in total acidity, pH, salt concentration, thiobarbituric acid-reactive substance (TBARS) and volatile basic nitrogen (VBN) were measured during drying at 30, 35 and $40^{\circ}C$ for 15 days in a hot air-dryer using a semi-dried method. Acidity increased with increasing drying time at all drying temperatures. The pH decreased gradually with increasing drying time. Salt concentration was increased as drying time increased at all drying temperatures due to moisture loss. The VBN increased as drying time increased for all drying temperatures. Data indicate that the drying at $35^{\circ}C$ appears to have a significant sensory and physicochemical advantage in Gulbi products.

Effect of Nitrite, Thiocyanate and Ascorbic acid on N-nitrosamine Formation in Salted and Dried Yellow Corvenia under Simulated Gastric Digestion (염건조기의 인공소화시 Nitrite, Thiocyanate 및 Ascorbic acid가 N-nitrosamine의 생성에 미치는 영향)

  • 이수정;신정혜;김정균;성낙주
    • Journal of Food Hygiene and Safety
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    • v.15 no.2
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    • pp.101-107
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    • 2000
  • This experiment was conducted to investigate the effect of NA formation in the human body with salted and dried yellow corvenia(Gulbi, Pseudosciaena manchurica) steamed for 30 minutes and incubated in 10 ml simulated saliva and 40 ml gastric juice at 37。C for 2 hours. And the experiment studied the NA formation after nitrite, thiocyanate and ascorbic acid treatment under simulated gastric conditions. N-nitrosodimethylamine(NDMA) was not detected when nitrite was not added to the digestate mixture. And then increasing the nitrite concentration from 0.5 mM to 8 mM gave a slight increase in the NDMA formation at all level of Gulbi utilized in the experiment. In contrast to the change of the nitrite concentration, the increase of the amount of Gulbi didn't show any marked influence on NDMA formation. At all level of thiocyanate(1∼6.4 mM) tested, concentration of NDMA was still proportional to the nitrite concentration. In the catalytic ability of thiocyanate at another high level of nitrite(100 mM) no catalytic activity was observed up to the level of 8mM thiocyanate. The same amounts of salted fish(10 g) and ascorbic acid levels in each single digestate were used to prevent NDMA formation. No prevention effect was observed at nitrite concentration of 0.5 mM and 1 mM. Most importantly, the decrease of NDMA concentration, by the increase of ascorbic acid absolutely, was remarkably shown when nitrite concentration was high. On the contrary, according to the degree of ascorbic acid, the higher the amount of nitrite the higher the prevention of NDMA formation.

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