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주선태(S . T . Joo),이석(S . Lee),김병철(B . C . Kim) 한국축산학회 1991 한국축산학회지 Vol.33 No.2
This study was carried out to investigate the effects of electrical stimulation on the functional characteristics and fragmentation of rabbit muscle. Ten male rabbit carcasses were split and divided into two sides. The left sides were electrically stimulated (at 220V, alternating current) while the right ones were served as unstimulated control. Postmortem pH, water holding capacity. sarcoplasmic protein extractability and myofibril fragmentation index of rabbit muscles were examined in a cold room (below 4℃) The results obtained were summarized as follows ; l. The stimulated side showed more rapid decrease in pH than the control (p$lt;0.01). 2. Water holding capacity(WHC) was significantly lower in the stimulated side than the control during storage except for the value at 48h. While the control side showed a gradual decrease in water holding capacity over 48h during storage, the treated side showed a more rapid decrease, only taking 24h. 3. The sarcoplasmic protein extractability(SPE) was different during the course of storage in the stimulated side. A slow decrease was found in the control side during storage. In contrast, there was a relatively sharp decrease in the stimulated one. 4. Myofibril fragmentation indcx(MFI was increased during postmortem storage in both groups, but the stimulated side showed higher index than the unstimulated one, especially after 3rd and 5th day(p$lt;0.01).
오리고기의 포장방법이 냉장저장 중 육색과 지방 산화에 미치는 영향
강근호,정태철,양한술,김상호,장병귀,강희설,이덕수,이상진,주선태,박구부,Kang G.H.,Jeong T.C.,Yang H.S.,Kim S.H.,Jang B.G.,Kang H.S.,Lee D.S.,Lee S.J.,Joo S.T.,Park G.B. 한국가금학회 2006 韓國家禽學會誌 Vol.33 No.1
함기 포장과 진공 포장이 냉장 저장 중 오리고기의 육색, 지방 산화 및 지방산 조성에 미치는 영향을 조사하였다. pH는 가슴육이 다리육에 비해 낮았으며, 냉장 저장 중 가슴육이 다리육에 비해 육색의 변화가 크게 나타났다. 다리육의 조지방 함량이 가슴육에 비해 약2배 정도 높았으며, 저장 3일 째부터 전단가가 낮아졌다. 함기 포장은 진공 포장에 비해 냉장저장 중 다리육의 지방 산화를 촉진하는 것으로 나타났으며, 지방 산화는 palmitic acid 함량의 감소와 linoleic acid 함량의 증가와 관련이 있는 것으로 나타났다 결과적으로 오리고기의 장기적인 냉장 유통을 위해서는 함기 포장보다 진공 포장을 하는 것이 바람직할 것으로 사료된다. The effects of aerobic and vacuum packaging of fresh duck meat on meat qualities including color, cooking loss, shear force, lipid oxidation and fatty acid composition during cold storage were investigated. The result showed that pH of the samples were decreased as increasing storage time, and leg meat showed significantly (p<0.05) higher than breast meat. Redness showed significantly (p<0.05) higher value in breast meat compared to leg meat as increasing the storage time. However, TBARS value showed significantly (p<0.05) higher in breast meat compared to leg meat as increasing storage time. This result suggested that the lower pH affected lipid oxidation and discoloration of the meat samples. However, fatty acid composition of 1 day storage time showed that aerobic packaging of leg meat had lower (p<0.05) ratio of palmitic acid and higher (p<0.05) ratio of linoliec acid, whereas vacuum packaging of leg meat showed higher (p<0.05) ratio of palmitic acid at 7 days storage time than other treatments. Therefore, this data speculated that saturated fatty acid like palmitic acid and unsaturated fatty acid like linoleic acid were affected by lipid oxidation at different storage time. Finally, aerobic packaging meat accelerated lipid oxidation compared to vacuum packaging meat, hence self life was no longer better than vacuum packaging meat without relation of different type of meat from duck.
Conjugated Linoleic Acid ( CLA ) 급여가 난황의 콜레스테롤과 CLA 함량에 미치는 효과
박구부(G . B . Park),이정일(J . I . Lee),박태선(T . S . Park),김진형(J . H . Kim),신택순(T . S . Shin),강석중(S . J . Kang),하영래(Y . L . Ha),주선태(S . T . Joo) 한국축산학회 1999 한국축산학회지 Vol.41 No.1
The effects of dietary conjugated linoleic acid (CLA) on the concentration of cholesterol and CLA in egg yolk were investigated. CLA was synthesized according to the method of Alkali isomerization using safflower oil. A total of 250 hens (200 days age) were fed a control diet (a commercial laying hen feed) or CLA-supplemented diets (T1 ; 1% CLA and 4% safflower oil, T2; 2.5% CLA and 2.5% safflower oil, T3; 5% CLA, and T4; 5% safflower oil) for 6 weeks. Eggs were collected for analysis of CLA, cholesterol and fatty acid levels in the yolk. CLA concentration in egg yolk was increased by level of dietary CLA or dwation of feed. The yolk CLA concentration of T3 rapidly increased for 2 weeks, and maintained there after. On the other hand, the concentration of T4 was not significantly different from that of control during the feeding period. These results implied that CLA could not be synthesized by hen and it was necessary to supplement the diet with CLA for CLA accumulation in egg yolk. The level of CLA in egg yolk depended on the amount of CLA supplemented, and over-supplementation of CLA was not necessary. As the yolk CLA increased, the levels of cholesterol, linoleic acid and arachidonic acid decreased but that of palmitic acid increased. It was suggested that a lowcholesterol egg might be produced with over 1% CLA-supplemented diet. The concentration of CLA in egg yolk was unchanged during 28 days storage at 4℃. However, the level of cholesterol decreased during the storage.