• Journal of Animal Science and Technology
• /
• 제49권2호
• /
• pp.257-268
• /
• 2007

본 연구는 멧돼지 교잡종육과 재래 흑돼지육, 개량종 돼지육의 냉장저장중 품질을 비교하고자 실시하였다. 방목사육된 멧돼지 교잡종(멧돼지 ♂×Duroc ♀, 평균 113kg, 거세돈 1두 및 미경산돈 3두) 4두와 옥내사육된 재래 흑돼지 5두(평균 64kg, 거세돈 5두) 및 개량종 돼지 5두(Landrace×Yorkshire×Duroc, 평균 114kg, 거세돈 5두)를 도축한 다음 등심(M. longssimus) 부위를 2±0.2℃에서 12일 동안 저장하면서 품질분석에 이용하였다. 수분 함량은 멧돼지 교잡종육이 재래 흑돼지육보다 높았으나(p<0.05), 조지방 함량은 낮았다(p<0.05). pH는 멧돼지 교잡종육이 저장기간 동안 개량종 돼지육보다 낮았으며(p<0.05), 그에 따라 낮은 보수력을 보였다(p<0.05). 표면육색은 멧돼지 교잡종육의 L*, a*, b*, C* 값이 저장기간 동안 재래 흑돼지육보다 낮았던 반면(p<0.05), 저장 3, 6일부터는 개량종 돼지육보다 높았다(p<0.05). 지방산 조성은 멧돼지 교잡종육이 타품종 돈육에 비해 포화지방산 함량이 낮고(p<0.05), linoleic acid와 arachidonic acid를 포함한 다가불포화지방산이 높았음에도 불구하고 저장기간 동안 지방산화는 지연되었다. 전자코의 PCA에 의한 향기패턴은 저장 0, 12일에 세 품종의 돈육간에 뚜렷한 차이를 보였다.

• 한국식품저장유통학회지
• /
• 제10권3호
• /
• pp.347-353
• /
• 2003

시판 pickling spice와 본 실험실에서 개발한 pickling spice를 사용하여 순무피클올 제조한 후 200(에서 저장하면서 이화학 석, 관능적 특성플 분석하였다. 염도, 환원당 함량, L, a 및 b 값, 기계적 경도 측정치는 두 시료간에 차이가 없었으나, 산 E는 본 실험섣에서 개발한 피클링 스파이스로 제조한 순무 페클(이하 순무피클M)이 시판되는 피클링 스파이스로 만든 피클(이하 순무피클P)에 비해 유의적으로 높았다(p<0.05) 관 능겁사결과, 붉은색의 정도, 새콤한 냄새, 향신료향, 전반적인 기호도의 항목은 두 시료 모두 저장 14일까지 증가하여 최고 치에 달한 후 그 이후 감소하였다. 운무냄새는 제조직 후에 높게 나티났고, 저장기간이 지남에 따라 점차 감소하였다. 경 도는 저장기간이 경파됨에 따라 감소하였다. 순무피클M은 향신료향, 상큼한 신맛, 천반적인 기호도 접수가 순무피클P에 비하여 유의적으로 높았으며(p<0.05), 저장 14일에 전반적인 지호도 접수는 순무피클 M이 8.0접, 순무피클 P가 6.1점으로 순무피콜 M이 순무피올 P에 비하여 유의적으로 높았을 뿐 아니라 저장28일까지도 유의적으로 높아 본 실험실에서 개발 한 pickling spice로 만든 순무피클은 기호도와 저장면에서 우 수하였다.

• Toxicological Research
• /
• 제30권4호
• /
• pp.305-309
• /
• 2014

Recently, there has been an increase in the use of several nephrotoxicity biomarkers in preclinical experiments. In addition, it has been indicated that the result may have been influenced by secondary factors, such as sample storage condition or storage period. In this study, we have assessed the variation in urinary nephrotoxicity biomarkers as a result of urine storage conditions and storage period of the urine. Urine was sampled from specific pathogen-free Sprague-Dawley rats (19 weeks old), which were housed individually in hanged stainless steel wire mesh cages. Urine was stored at $20^{\circ}C$, at $4^{\circ}C$, or at $-70^{\circ}C$ after sampling. The levels of the biomarkers such as beta-2 microglobulin (B2M), cystatin-C (Cys-C), N-acetyl-${\beta}$-D-glucosaminidase (NAG), micro albumin (MA), micro protein (MP) were measured at 6, 24, 48 and 144 hr after sampling. The B2M level was significantly decreased at 6, 24, 48, and 144 hr compared to 0 hr at $-70^{\circ}C$ (p < 0.05, p < 0.01, p < 0.05, and p < 0.05, respectively) and 24 and 144 hr at $20^{\circ}C$ (p < 0.01, p < 0.01, respectively). The Cys-C level was significantly decreased at 144 hr compared to 0 hr at $4^{\circ}C$ (p < 0.01), at $20^{\circ}C$ (p < 0.05) and at $70^{\circ}C$ (p < 0.01). MP and MA levels were not different for 144 hr in all storage conditions. Taken together, B2M and Cys-C levels were modulated by storage temperature and period. For the enhancement of test accuracy, it is suggested that strict protocols be established for samples to minimize the effects of the storage conditions on the detected levels of biomarkers.

• 한국태양에너지학회 논문집
• /
• 제21권1호
• /
• pp.71-82
• /
• 2001

The heat transfer experiment in a latent heat storage tank as a solar energy storage system for the hot water supply was carried out. The latent heat storage tank was consisted of triple - tube type ; Outer shell for hot water from solar collector, PCM storage vessel in the middle of the tank and inside tube for hot water recovery. The heat storage tank has the dimension of 60 cm long and 34 cm outside diameter. Paraffin wax(m.p = 55.4C) and sodium acetate trihydrate(m.p = 58 C) were employed as the PCM this study. Experimental variables were inlet temperature and flow rate of the hot water for heat storage stage and cold water for heat recovery stage. Temperature profiles, heat transfer coefficient and the efficiency of heat storage$(Q/Q_{max})$ and heat recovery $(Q/Q_{max})$ were determined for the paraffin wax and inorganic salt respectively.

• 한국태양에너지학회 논문집
• /
• 제21권1호
• /
• pp.83-91
• /
• 2001

The heat transfer experiment in a pilot scale latent heat storage tank as a solar energy storage system for the hot water supply was carried out. The latent heat storage tank was consisted of three parts; Outer shell for hot water from solar collector, PCM storage vessel in the middle of the tank and immersed coil in the PCM vessel for hot water recovery. The heat storage tank has the dimension of 115 cm in height and 32 cm outside diameter. Paraffin wax (m.p = 55.4C) and sodium acetate trihydrate (m.p = 58 C) were employed as the PCM this study. Experimental variables were inlet temperature and flow rate of the hot water for heat storage stage and cold water for heat recovery stage. Temperature profiles, heat transfer coefficient and the efficiency of heat storage $(Q/Q_{max})$ and heat recovery $(Q/Q_{max})$ were determined for the paraffin wax and inorganic salt respectively.

• 한국식품위생안전성학회지
• /
• 제12권1호
• /
• pp.15-19
• /
• 1997

The stability of monascin yellow pigment isolated from Monascus purpureus was determined over a period of storage for the wide range of pH, various metal ions and antioxidants. The absorption maximum of monascin pigment was 385 nm. Monascin pigment was more stable in acid solutions than in alkaline (pH 9 and pH 11) during storage period. It was also observed the reduction of absorption was occur after 3 days storage. The stability of monascin pigment was not changed by adding the various metal ions of the concentration of 10-4 M, however, it was unstable by adding the Zn2+, Al3+ and Fe3+ of 103- M concentration. The antioxidants. BHA, BHT, cysteine and L-ascorbic acid, have no effects on the stability of monascin yellow pigment. Thus, it may be concluded that the monascin pigment is stable and useful food additives as the natural colorant except for the alkaline food and food containing the Zn2+, Al3+ and Fe3+.

• Preventive Nutrition and Food Science
• /
• 제8권4호
• /
• pp.349-355
• /
• 2003

Effects of extraction conditions, gamma-irradiation and storage conditions on bioactivities of Citrus (Citrus unshiu) peel extract were investigated. The Hunter color $L^{*}$- and $a^{*}$-values of the extract increased but $b^{*}$-value decreased with an increase in absorbed irradiation dose. DPPH radical scavenging, tyrosinase inhibition and nitrite scavenging activities were not affected by irradiation but reduced by increased storage time. Nitrite scavenging activity of the extract was the highest at pH 1.2 followed by pH 4.2 and 6.0 and not changed by storage. Results indicated that there is potential for using citrus peel byproducts as a bioactive ingredient, and that gamma irradiation brightens the color of the extract without adversely altering its biological activity.ity.

• Asian-Australasian Journal of Animal Sciences
• /
• 제20권2호
• /
• pp.214-219
• /
• 2007

A $3{\times}3$ factorial design experiment was conducted to investigate the effect of temperature and duration of storage on the fermentation quality of potato pulp ensiled with two fungal inoculants under laboratory conditions. The inoculants, Rhizopus oryzae (R) and Amylomyces rouxii (A) were each added to potato pulp material to contain at least $1{\times}10^6$ CFU/g fresh matter, and silages without additives served as controls. The silages were stored under three temperature regimes; 4, 12 and $25^{\circ}C$. Three silos per treatment from every temperature regime were opened on days 7, 24 and 40 days after ensiling to investigate treatment effects on fermentation quality, starch and sugar concentrations. Increase in temperature and duration of storage had a positive significant effect (p<0.01) on the fermentation quality of potato pulp silage (PPS). The inoculants had little effect (p>0.05) on the fermentation quality of the silages. Sugar concentration in the silages decreased with increase in temperature (p<0.01) but increased (p<0.05) with progression of duration of storage. The fungal inoculants had no effect on starch degradation in PPS. The results suggest that storage temperature and duration of storage are more important in determining the rate of fermentation than addition of the fungal inoculants in PPS.

• 한국축산식품학회지
• /
• 제29권5호
• /
• pp.579-589
• /
• 2009

This study was conducted to investigate the effects of heating, fiber type used in solid-phase microextraction (SPME, two phase vs three phase) and storage time on the volatile compounds of porcine M. longissimus dorsi (LD). Volatile compounds were measured using a gas chromatography and mass spectrometry (GC/MS) with a quadrupole mass analyzer. Among the volatile compounds identified, aldehydes (49.33%), alcohols (24.63%) and ketones (9.85%) were higher in pre-heated loins ($100^{\circ}C$/30 min), whereas, alcohols (34.33%), hydrocarbons (22.84%) and ketones (16.88%) were higher in non-heated loins. Heating of loins induced the formation of various volatile compounds such as aldehydes (hexanal) and alcohols. The total contents of hydrocarbons, alcohols, and carboxylic acids were higher in two phase fibers, whereas those of esters tended to be higher in three-phase fibers (p<0.05). Most volatile compounds increased (p<0.05) with increased storage time. Thus, the analysis of volatile compounds were affected by the fiber type, while heating and refrigerated storage of pork M. longissimus dorsi increased the volatile compounds derived from lipid oxidation and amino acid catabolism, respectively.

• 태양에너지
• /
• 제20권3호
• /
• pp.11-19
• /
• 2000

In this study, the basic data which were required for development of LHSS(latent heat storage system) were experimentally obtained. Experiments were carried out under the following conditions. The initial temperatures of P.C.M. which were used by parameter is $5^{\circ}C,\;9^{\circ}C$ and $14^{\circ}C$. The conditions of working fluid are $-6^{\circ}C,\;-4^{\circ}C$, and $65{\ell}$/min.. The pure water of which the freezing point is $0^{\circ}C$ was filled in the system, and the Ethylene glycol(brine) was circulated through the 10 vertical tubes as a secondary fluid in order to cool the P.C.M. down. The inlet temperature of the secondary fluid and the initial temperature of the water were varied to investigate the effects of the important design parameters. The phenomenons of temperature conversion of P.C.M. were appeared for the conductive heat transfer and free convective heat transfer by buoyancy force in this storage unit system. In order to find the effective water circulation path, we obtained P.CM. temperature distributions of 5 parts in the storage tank during freezing process.