• 한국식생활문화학회지
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• 제28권1호
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• pp.78-88
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• 2013

Marinated beef galbi is a traditional Korean dish cooked with soy sauce, pear juice, onion, sesame oil, and sugar. However, there are many differences in beef galbi, including flavor and physicochemical aspects, depending on cooking conditions. Therefore, the physicochemical characteristics of marinated beef galbi prepared through various recipes was evaluated for its effects on pH, texture, aging, proteolysis, heating conditions, cooking time, and flavor compounds (pyrazines, IMPs, or FAAs). There were significant differences in salt concentration (0.8~3.03%), pH (4.89~6.22), and solid soluble contents (1.34-6.31 Brix) between recipes in this study. In the Pearson assay for sensory evaluation, overall preference correlated well with texture (a well-known sensory attribute in meat evaluation). Controlling the pH of meat through soaking in lemon solution, alkali water, phosphate, and baking powder solution, improved water holding capacity as much as 9 to 15% compared with the control. The myofibril index (MFI) of marinated meat stored at $4^{\circ}C$ increased 32% with 24 hours of aging and reached 39% at 48 hours of aging, and its fragmentation was observed through microscopy. SDS-PAGE showed hydrolysis of acid-soluble collagen by the pear juice, possibly related to meat tenderness. On the basis of surface temperature, the cooking time was estimated to be 8 minutes with pan heating at $170^{\circ}C$, 6 minutes at $270{\sim}300^{\circ}C$, and 4 minutes with charcoal at $700{\sim}900^{\circ}C$. Different pyrazine compounds, such as 2-methyl-3-phenylpyrrol(2,3-b) pyrazine (the typical product of the browning reaction) was mainly detected, and IMP (one of the main taste compounds in beef) was in higher amounts with the charcoal treatment, potentially related to its flavor preference among treatments. Our results demonstrate an effective case study and cooking system for beef galbi.

• 한국축산식품학회지
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• 제22권1호
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• pp.30-36
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• 2002

오늘날 고기 소비가 증가하면서 소비자들은 평범한 식품보다는 질병의 예방 또는 치료 효과가 있는 기능성 식품성분을 요구하게 되었다. 본 연구의 목적은 불고기 양념에 분쇄한 인삼세근을 첨가량에 따라 0%, 0.5%, 1.0%과 2.0%수준으로 첨가하여 돈육 인삼불고기제품을 개발한 다음 인삼첨가수준에 따른 이화학적 및 관능적 제품특성을 무첨가구와 비교하고자 실시하였다. CIE로 측정한 육색에 있어서는 인삼 첨가비율이 증가할수록L값과 b값이 증가하는 경향을 나타내었다. 인삼이 첨가되지 않은 처리구와 비교하여 인삼이 첨가된 처리구의 연도가 낮게 나타났으나 응집성, 탄력성 및 씹힘성에서는 유의적인 차이가 없었다. 관능 평가 결과 인삼첨가 농도가 높은 처리구가 기호도가 더 높은 것으로 나타났다. 가열 조리한 다음 5$^{\circ}C$에서 7일간 냉장 저장하면서 산화도를 측정한 결과 인삼 첨가구가 저장 기간이 증가할수록 무첨가구와 비교하여 낮은 TBA 값을 나타냈다. 지방산 조성은 인삼 2% 첨가한 처리구가 PUFA/SFA 비율이 높게 나타났다. 결론적으로 돈육 불고기 제품에 인삼을 첨가함으로서 육질에 크게 영향을 주지 않으면서 향과 기호도를 증진시켜 일반돈육제품과 차별화된 제품이 될 수 있을 것으로 기대된다. 따라서 본 연구에서 개발한 인삼불고기 돈육가공제품은 우리 나라에서 생산되는 인삼과 국내 비선호부위인 돈육의 전지 및 후지를 적절하게 이용한 것으로서 국제시장에서 돈육 수출 및 소비 확대에 기여할 수 있을 것으로 기대된다.

• Journal of Animal Science and Technology
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• 제61권1호
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• pp.1-9
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• 2019

Little is known about the effects of the plane of nutrition on growth performance and meat quality of grow-finish pigs under commercial production conditions. The present study was thus addressed to this virtually unanswered question. One hundred and two barrows and 102 gilts weighing approximately 24 kg were fed phase I and II grower diets with a high, medium, or low plane of nutrition (HP, MP, or LP) to approximately 43 and 70 kg, respectively, in 6 replicates (pens). Subsequently, the HP and MP groups were fed the HP and MP1 finisher diets, respectively, the LP group being fed a second MP (MP2) finisher diet (LP1 group). Moreover, 68 LP-grower-fed barrows and gilts were added to the feeding trial and fed the MP1 and LP finisher diets to approximately 95 kg and thereafter, respectively (LP2 group). All MP diets had the lysine:calorie ratios comparable to the RNC recommendations, with < 18% differences between those of the HP and LP diets. The finisher pigs were reared in 16 pens and slaughtered at approximately 115 kg. The gain:feed ratio, but not average daily gain (ADG), was greater for the HP group than for the MP and LP during the grower phase I whereas during the grower phase II, ADG was greater (p < 0.05) for the HP and LP groups vs. MP. During the finisher phase I, ADG was less for the LP (LP1 + LP2) group vs. HP and MP, with no difference between the HP and MP groups; the gain:feed ratio was less for the LP vs. MP group. Backfat thickness was greater for the LP vs. HP group. The water holding capacity of fresh longissimus dorsi muscle (LM) and the sensory juiciness score for cooked LM were greatest for the LP group, the sensory flavor and tenderness scores being greater for the LP group vs. MP. In conclusion, results suggest that compensatory growth occurred for the LP and MP groups during the grower phase II and finisher phase I, respectively, with fat deposition increased for the LP group and that meat quality could be improved by the use of LP.

• 한국축산식품학회지
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• 제27권2호
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• pp.228-234
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• 2007

본 연구는 미강 추출 식이섬유 혼합물을 첨가하였을 경우 돈육 유화물의 이화학적 품질 특성을 조사하여 미강을 이용한 기능성 육제품의 활용성에 대한 연구를 실시하였다. 돈육 유화물의 일반성분은 첨가되는 미강 추출 식이섬유 함량이 높을수록 수분함량이 낮아지고 단백질, 지방, 회분함량은 증가하였으며, 식이섬유 첨가량이 적정 수준 이상 되면 수분함량이 낮아지고, 단백질과 회분함량이 높아졌다. pH는 가열 전과 가열 후 모두 처리구들이 대조구와 비교하여 높은 pH를 나타내었고, 가열 후 pH가 가열 전 pH보다 높게 나타났다. 색도는 가열 전 돈육 유화물의 명도와 적색도는 대조구와 비교하여 미강 추출 식이섬유를 첨가한 처리구들이 유의적으로 낮았으며, 황색도는 대조구가 처리구들보다 낮은 값을 나타내었다. 가열 후 돈육 유화물의 명도는 대조구가 미강 추출 식이섬유를 첨가한 처리구들과 비교하여 높은 값을 나타내었고, 황색도는 대조구가 처리구들보다 낮은 값을 나타내었다. 가열감량과 유화안정성도 수분리와 유분리 모두 대조구와 비교하여 모든 처리구에서 유의적으로 낮았으며, 점도도 미강 추출 식이섬유 6% 첨가구가 유의적으로 높은 것으로 나타났다. 경도, 응집성, 검성, 씹음성은 대조구와 비교하여 미강 추출 식이섬유 첨가구가 유의적으로 높게 나타났다. 따라서, 미강 추출 식이섬유 혼합물을 첨가하였을 때 이화학적 품질 특성이 우수한 결과를 보여, 최근 건강에 대한 높은 관심을 반영한 웰빙 식품에 활용한다면 현대인들이 선호할 것으로 기대된다.

• Asian-Australasian Journal of Animal Sciences
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• 제19권2호
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• pp.286-291
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• 2006

The objective of the present study was to investigate the effects of growth performance, chemical composition and meat quality parameters by the addition of fermented persimmon shell diets (FPSD). The experimental animals were ninety-six Berkshires. The pigs were allotted at 8 per pen in front-open building with three replicate pens per treatment. Until $61{\pm}1kg$ live weight at 140 days, the animals were fed growing diet, after which, experimental samples were fixed at 0, 3, 5 and 7% FPSD as C, T1, T2 and T3 in the finishing diets. Pigs of $103{\pm}1kg$ live weight were slaughtered by electrical stunning. In growth performance, ADG increased more (p<0.05) in T2 than C and T1. ADFI (kg/day) was higher (p<0.05) in T2 than in other groups. Feed conversion ratio was lower (p<0.05) in T2 than in other groups. On longissimus dorsi muscle (LM), the content of moisture was lower (p<0.05) in T3 than in other treatments. Crude fat increased (p<0.05) by addition of FPSD. pH at 24 h ($pH_{24}$) decreased more (p<0.05) in T2 and T3 than C and T1 by addition of FPSD. WHC decreased (p<0.05) by addition of FPSD. In meat, Hunter $L^*$ and $a^*$ were lower (p<0.05) in C than in other treatments. Hunter $b^*$ was higher (p<0.05) in T3 than in other treatments. In back-fat, Hunter $L^*$ was higher (p<0.05) in C than in other treatments. Hunter $a^*$ was not different in C and T1 but increased (p<0.05) in treatments by addition of FPSD. Hunter $b^*$ increased (p<0.05) by addition of FPSD. In sensory evaluation scores, for fresh meat, the value of meat color was higher (p<0.05) in T2 and T3 than in C and T1. The value of marbling was lower (p<0.05) in C than in other treatments. The value of drip loss was higher (p<0.05) in C than in other treatments and was lower (p<0.05) in T2 and T3 than in other treatments. The results of cooked meat, the value of tenderness was not different in C and T1 but increased (p<0.05) in other treatments. The value of flavor was significantly higher (p<0.05) in T2 and T3 than in C and T1. The value of overall acceptability was increased (p<0.05) by addition of FPSD. Hence we can conclude that addition of FPSD affected growth performance and meat quality parameters, in particular, it improved crude fat, hunter $L^*$ and $b^*$, and sensory evaluation on pork and was also seen to affect $pH_{24}$ and WHC. FPSD can be used for improvement of meat quality parameters.

• Journal of Animal Science and Technology
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• 제62권5호
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• pp.702-712
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• 2020

Synthetic nitrite imparts a reddish-pink color to meat and a distinct flavor to meat products, delays lipid oxidation, and inhibits microbial growth and pathogens. However, excessive intake of nitrite might result in the production of carcinogenic nitrosamine, which might increase the risk of cancer in humans. Therefore, we aimed to find an alternative natural colorant for pork sausages. Pork sausages were mixed with 0.014% sodium nitrite (NaNO₂) alone (CON), without either NaNO₂ or purple-fleshed sweet potato powder (PP; CON1), 0.5% PP alone (PP1), 1% PP (PP2) alone, 0.011% NaNO₂ and 0.5% PP (SP1), and 0.011% NaNO₂ and 1% PP (SP2). The sausages were then cooked and stored for physicochemical analysis on days 0, 5, 10, 15, and 20. The a* and W* values were the greatest and lowest in the SP2 and CON1 treatments, respectively (p < 0.05). The concentrations of residual nitrite in the sausages at 20 days decreased in the order of CON > SP1, SP2 > PP2 > PP1, CON1. The fatty acid content was higher, and flavorous amino acids were more in PP2 (p < 0.05). The fatty acid composition was comparable between the SP2 and CON groups, but the contents of glutamic acid and alanine were greater in the SP2 group. In conclusion, SP2 (0.011% NaNO₂ with 1% PP) could be added as a natural colorant for pork sausage production, and NaNO₂ could be substituted with up to 20% PP without detrimental effects on sausage appearance and/or quality.

• 대한지역사회영양학회지
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• 제6권3호
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• pp.271-281
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• 2001

This study was performed to compare the anthropometric and the food and nutrient intake of the adolescents between urban areas and islands in south Kyungnam and to identify their nutritional problems. A questionnaire survey was distributed among 383 middle school students for the food and nutrient consumption and other nutritional attitudes including socioecomonic status. The height and weight of the students were measured as well. Socioeconomic status, such as income, educational level, and jobs of the urban students parents was better than that of the island students. There was no significant difference in height between the students of both areas, but the body weight of the urban male students was far heavier than that of the other group. It is very interesting to note that the energy intake of the urban male students was much lower than that of the island male students. The students of the two areas consumed more protein, Vit B$_1$, Vit B$_2$, niacin and Vit C than the recommended daily allowances(RDA) but the intake of Ca, Fe, Vit A was less. As to the sources of animal fat, the urban males consumed much more. Regarding the taste preference, the study shows that urban male students are more likely to choose sweet, salty and soft tastes than island male students. In the case of female students, although island students prefer a rather hot taste, urban students are more likely to prefer sweet and soft tastes. The favorite foods of urban students are meat products, fastfoods, chocolate, cheese and milkshakes, while foods like cooked rice with assorted vegetable are the favorite of the island students. In general, the preference degree for meat products and fruits rates higher than for vegetables. Conclusively the urban students had a tendency of being obese and the intake of all nutrients by the urban adolescents was much lower than that of the islanders. In this study, the cause can be found in significant differences in consuming animal fat, of taste preference and of choosing favorite food. Accordingly a nutritional intervention or educational program is required to adjust the imbalanced intake of some nutrients for the adolescents in this province.

• Journal of Animal Science and Technology
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• 제53권3호
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• pp.211-222
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• 2011

The present review was aimed to assess the feasibility of increasing the slaughter weight (SW) of finishing pigs. Growth performance, including ADG, ADFI and gain:feed, does not change significantly with increasing SW between 110 and $135{\pm}5kg$ in lean-genotype pigs, whereas in non-lean pigs, ADG and gain:feed decrease with increasing SW within the similar range of BW. Backfat thickness (BFT) and marbling of the carcass, which are greater in barrows than in gilts, increase with the increase of SW. The SW could be increased by using a low-energy diet and thereby reducing the rate of fat deposition per weight gain. The yield of the belly increases with the increase of SW, which may be economically significant in Korea. However, yields of some other primal cuts do not change so much as to affect the carcass value. The redness and fat content of the muscle increase slightly with the increase of SW whereas moisture content is minimally influenced by SW. Muscular protein content rarely changes, but sometimes increases slightly, with increasing SW. Other physicochemical characteristics, including lightness, pH, drip loss, and cooking loss of the muscle, are barely influenced by SW. Marbling of fresh loin and ham increases with increasing SW. Sensory characteristics of fresh loin, ham, and belly, including color, aroma, off-flavor, drip, and acceptability, are not influenced significantly by SW. The eating quality of cooked pork also has almost no relation to SW. In conclusion, it is thought that the current SW for moderately lean barrows and gilts can be raised up to 125 and 135 kg, respectively, with BFT at these weights predicted to be approximately 24 mm near the last rib, without compromising the meat quality.

• Asian-Australasian Journal of Animal Sciences
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• 제22권3호
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• pp.448-458
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• 2009

It has been well documented from animal and human studies that conjugated linoleic acid (CLA) has numerous beneficial effects on health. In chickens, CLA exerts many effects on performance ranging from egg quality and yolk lipids to meat quality. Although there are several CLA isomers available, not all CLA isomers have the same incorporation rates into egg yolk: cis-9,trans-11 and trans-10,cis-12 CLA isomers are more favorably deposited into egg yolk than other isomers investigated, but of the two isomers, the former has a higher incorporation rate than the latter. CLA alters the amounts and profiles of lipids in plasma, muscles and liver. Furthermore, increased liver weight was reported in chickens fed dietary CLA. As observed in egg yolk, marked reduction in intramuscular lipids as well as increased protein content was observed in different studies, leading to elevation in protein-to-fat ratio. Inconsistency exists for parameters such as body weight gain, feed intake, feed conversion ratio, egg production rate and mortality, depending upon experimental conditions. One setback is that hard-cooked yolks from CLA-consuming hens have higher firmness as refrigeration time and CLA are increased, perhaps owing to alterations in physico-chemistry of yolk. Another is that CLA can be detrimental to hatchability when provided to breeders: eggs from these breeders have impaired development in embryonic and neonatal stages, and have increased and decreased amounts of saturated fatty acids and monounsaturated fatty acids (MUFAs), respectively. Thus, both problems can be fully resolved if dietary sources rich in MUFAs are provided together with CLA. Emerging evidence suggests that CLA exerts a critical impact on stress and immune functions as it can completely nullify some of the adverse effects produced by immune challenges and reduce mortality in a dose-dependent manner. Finally, CLA is a key regulator of genes that may be responsible for lipid metabolism in chickens. CLA down-regulates both expression of the gene encoding stearoyl-CoA desaturase-1 and its protein activity in the chicken liver while up-regulating mRNA of sterol regulatory element-binding protein-l.

• 한국환경과학회지
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• 제25권11호
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• pp.1459-1466
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• 2016

In this study, the concentrations of polycyclic aromatic hydrocarbons (PAHs) were investigated in meat process food and for cooking methods (pan-frying and charcoal fire). The methodology involved liquid-liquid extraction, silica gel cartridge clean-up and determination by gas chromatography/mass spectrometry (GC/MS). The recovery of 17 PAHs spiked into these samples ranged from 66.6 % to 98.0% and the coefficient of variation was less than 10%, but that of dibenz(a,h)anthracene was 16.39%. The mean concentration of total PAHs in processed samples was ND~7.2 ng/g, whereas that pan-fried and charcoal-fired samples were ND~22.1 ng/g and, 12.7~367.8 ng/g, respectively. Therefore, the concentrations of total PAHs in cooked samples were higher than in original samples and charcoal-fired samples had the highest total PAH levels.