The objective of this study was to investigate the effects of gender on meat quality traits and sensory characteristics of pork loin. A total of 90 pork carcasses (180 days old, 45 barrows and 45 gilts, each gender group was consisted of fifteen 1+, 1 and 2 carcass grades) were selected and loin cuts were excised to investigate meat quality, electronic tongue measures and sensory panel test. There were significant differences in drip loss (1.66% vs 1.21%), released water (12.19% vs 10.68%) and cooking loss (23.67% vs 21.04%) between loins from barrow and gilt (p<0.05). However, no significant differences in meat color (CIE L* a* b*) and shear force were observed between gender groups (p>0.05). Umami and richness values of barrow were significantly higher than those of gilt, while barrow had significantly lower sourness value compared to gilt (p<0.05). On the sensory evaluation, barrow scored higher in flavor, juiciness and tenderness both, and as a result, barrow (5.51 points) also scored significantly higher than gilt (4.86 points). These results suggest that the umami intensity and sensory taste of barrow loin are superior to gilt loin due to its high water-holding capacity.

Lactic acid bacteria (LAB) and probiotics have mostly consumed as dairy products such as city milk, fermented drinking yogurt and stirred yogurt, and LAB and probiotics have become popular to contribute to the flavor, taste, or preservation of food. In this study the effects of various milk products on the physicochemical properties of pork loin were determined. Pork loin samples were marinated in city milk, drinking yogurt and stirred yogurt for 24 hours, and were compared with the raw pork loin (control). Proximate, pH, color, shear force, electronic nose, and sensory evaluation were investigated quality properties of pork loin. The pre- and post- cooking pH was lowest in pork loin marinated in stirred yogurt(p <0.05). The pre-cooking lightness was significantly higher in pork loin marinated in city milk(p<0.05). The redness of pork loin marinated in stirred yogurt and drinking yogurt were significantly higher(p <0.05), but the shear force of pork loin marinated in stirred yogurt was significantly lower(P<0.05). The sensory evaluation of pork loin marinated in stirred yogurt were the highest(p<0.05). These results showed that various milk product marinating could be used to improve the quality characteristics and flavor of pork loin.

The objective of this study was to develop a palatability index for evaluating taste quality of pork through correlation and causality between fatty acids and taste related factors. Results of analysis of the components and taste evaluation among varieties showed that the taste quality of Duroc pork was the best. A correlation was found between fatty acids and taste evaluation factors. Saturated fatty acids (SFAs) and oleic acid increased the sweetness and savory taste, the preferred flavors, while sourness and bitterness, the non-preferred flavors, decreased, and thus positively affecting the taste. Polyunsaturated fatty acids (PUFAs) have been shown to have a negative effect on taste by decreasing their preferred taste while increasing their non-preferred taste. In addition, multiple regression between fatty acid and five taste factors showed that stearic acid and oleic acid increased the sweetness and savory taste, while myristic acid decreased the bitterness. Linolenic acid was found to be negatively affecting the taste by increasing non-preferred flavors. In conclusion, SFAs, oleic acid and linolenic acid were found to be the major factors affecting the taste of pork. Therefore, the results of this study can be used as an index to produce delicious pork for pig producers as well as help consumers to trust and purchase high quality domestic pork.

The impregnation of solid foods into the surrounding hypotonic or hypertonic solution was explored as a method to infuse NaCl in pork loin cube without altering its matrix. Mass transfer kinetics using a diffusive model as the mathematical model for moisture gain/loss and salt gain and the resulting textural properties were studied for the surrounding solutions of NaCl 2.5, 5.0, 10.0 and 15% (w/w). It was possible to access the effects of brine concentration on the direction of the resulting water flow, quantify water and salt transfer, and confirm tenderization effect by salt infusion. For brine concentrations up to 10% it was verified that meat samples gained water, while for processes with 15% concentration, pork loin cubes lost water. The effective diffusion coefficients of salt ranged from 2.43×10-9 to 3.53×10-9 m2/s, while for the values of water ranged from 1.22×10-9 to 1.88×10-9 m2/s. The diffusive model was able to represent well salt gain rates using a single parameter, i.e. an effective diffusion coefficient of salt through the meat. However, it was not possible to find a characteristic effective diffusion coefficient for water transfer. Within the range of experimental conditions studied, salt-impregnated samples by 5% (w/w) brine were shown with minimum hardness, chewiness and shear force.

This study was conducted to investigate the quality characteristics, anti-oxidation activity and di-peptide (anserine, carnosine) contents of marinated pork loin from Korean native black pig (KNBP) and crossbred of Landrace×Yorkshire×Durock (LYD) by addition of fruits (pineapple and gold kiwi). Sliced pork loin (13~15 mm) was marinated in three different treatments: 1) no fruits addition, 2) with seasoning and pineapple for 5 h, 3) with seasoning and kiwi for 5 h. Addition of fruits significantly decreased pH, hardness and chewiness of marinated KNBP and LYD pork loin. Anti-oxidation activity in pork were significantly increased by addition of fruits. Especially, addition of gold kiwi in the pork loin marinated for 5 h showed the highest anti-oxidation activity and carnosine contents. Also, it showed the highest score in the sensory characteristics (juiciness and tenderness). These results suggested that the pork loin marinated with gold kiwi for 5 h could be one of the solutions to enhance quality characteristics of marinated KNBP and LYD.

본 연구는 도포공정(battering)시 다양한 검류의 첨가가 돈육 등심 돈가스의 이화학적 특성 및 관능적 특성에 미치는 영향에 대해 알아보고자 실시하였다. 일반적인 도포공정에 사용되는 밀가루를 대조구로 설정하였으며, 밀가루와 구아검(guar gum)을 혼합한 T1, 밀가루와 잔탄검(xanthan gum)을 혼합한 T2, 밀가루와 아라비아검(gum arabic)을 혼합한 T3 및 밀가루와 로커스트빈검(locust bean gum)을 혼합한 T4로 설정하였다. 조리는 대두유를 사용하여 튀김유조로 170℃에서 3분간 실시하였다. 일반성분 분석 결과, 수분함량, 조지방 및 조회분 함량은 처리구들 간 차이가 없었으나, 대조구에 비해 처리구에서 낮은 단백질 함량을 나타내었다(P<0.05). 또한 다양한 검류의 사용은 칼로리 함량을 떨어뜨리는 것으로 나타났다. 밀가루만 사용한 대조구에 비해 검류의 사용은 돈가스의 pH 증가뿐만 아니라, 가열수율을 향상시켰다. 특히 잔탄검을 혼합 첨가한 T2에서 가장 높은 가열수율을 나타내었다(P<0.05). 또한 검류의 첨가는 조리 후 제품 색에 있어 높은 명도 값을 나타내었다(P<0.05). 이러한 결과는 관능평가로 이어져 모든 처리구에서 대조구에 비해 낮은 육색 선호도를 나타내었다(P<0.05). 그러나 향, 바삭함, 기름진 정도 및 전체적인 기호도에서 대조구와 유의적인 차이가 나타나지 않았다. 따라서 돈육 돈가스 제조 시 도포공정에 검류를 첨가할 경우 지방함량 및 칼로리 감소 가능성, 황색도 및 조직감에서 우수한 결과를 보여 돈가스의 품질이 보다 개선된 제품을 제조할 수 있을 것으로 사료된다.

본 연구는 염지공정에 사용되는 대표적인 염지제 종류를 각각 또는 혼합 처리한 돈육 등심의 품질 특성을 확인하고, 육제품 특성에 영향하는 각 염지제의 특성을 확인코자 실시하였다. 본 실험의 원료육은 돈육 등심을 이용하여 염지제를 첨가하지 않은 대조구(C)와 소금 5%(T1), 인산염 5%(T2), 탄산수소나트륨 3%(T3), 소금 5% + 인산염 5%(T4), 소금 5% + 탄산수소나트륨 3%(T5) 및 인산염 5% + 탄산수소나트륨 3%(T6) 등 원료육 중량의 10%를 기준으로 처리구를 설정하였다. 주입된 처리구들은 준비된 폴리백에 보관 후 24시간 동안 4℃에 냉장보관 하였다. pH 측정 결과, 5.44-6.04의 범위를 보였으며, 소금 염지 처리구(T1)을 제외한 모든 처리구에서 대조구보다 높게 나타났다(p<0.05). 육즙감량(%)은 대조구에서 다른 처리구들에 비해 높게 나타났으며(p<0.05), 보수력(%) 또한 처리구에서 대조구에 비해 높은 경향을 보이며 T1과 T3 처리구에서 가장 높은 보수력을 나타내었다(p<0.05). 단백질 용해성의 총단백질 및 근원 섬유단백질 농도는 모든 처리구에서 높은 용해성을 나타내었다(p<0.05). 결과적으로 염지제의 종류 및 이의 혼합 처리에 따른 돈육 등심의 이화학적 특성에 뚜렷한 차이를 보이지 않았으나, 염지제의 처리는 근육의 pH 상승과 육즙 손실의 감소, 보수력 및 단백질 용해성을 증가시켜 육제품의 품질특성에 기여할 것으로 판단된다.

The objective of this study was to evaluate the changes in the physicochemical and microbiological characteristics of pork loin meat through microwave treatment. The microwave treatment was divided into two groups: continuing microwave treatment (CW) and holding microwave treatment (HW). The microwave treatment resulted in a whiter color (L value) and affected the a, b value. The initial pH was 5.51~5.74, but it increased to 6.32~6.51 when the pork loin samples were stored for three days. During storage for 14 days, the pH changes were not significantly different (p>0.05). The thiobarbituric-acid values of all the pork loin samples increased along with the storage period, and decreased with increasing microwave dose. The volatile basic nitrogen (VBN) content of the control was higher than those of the other samples, and the VBN content decreased along with the microwave dose. The total plate counts of the pork loin samples decreased with increasing microwave dose. The study results indicated that T2 (100 W, HW) is most effective for the safety of pork loin meat without decreasing the meat’s physicochemical and microbiological characteristics.

Microbial populations (total bacteria, lactic acid bacteria and coliforms), TBA, VBN and POV were investigated for evaluating the shelf life of pork loins gamma-irradiated at doses of 1, 3, 5 and 10 kGy with air-contained and vacuum-packaged methods. The initial microbial populations decreased with gamma irradiation depending upon the dose and microorganisms in the vacuum-packaged samples were inhibited more than those in the air-contained samples. POV, TBA and VBN values were higher in the air-contained samples than in the vacuum-packaged samples. In conclusion, the combination of gamma-irradiation and vacuum-packaging could extend the shelf life of chilled pork loin.