• 한국식품저장유통학회지
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• 제30권4호
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• pp.562-572
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• 2023

In this study, we aimed to evaluate the quality of Aralia elata shoots according to different packaging methods during storage at 2℃. The highest level of dehydration and wilting incidences were observed in polypropylene containers with polyvinyl chloride wrap (PP+PVC), and these levels continually increased during the entire storage period, compared to other packaging methods. The overall marketability of A. elata shoot packaged in polyethylene terephthalate container (PET) and PP with the mineral-coted functional warp (PP+F) constantly declined during storage with a similar level of 38.6 and 36.0% at 15 days in storage, respectively. PP with PET cover packaging (PP+PET) showed the lowest decay and wilting rates during the entire storage, and the wilting score at 10th day was 51.9, 58.0, 51.8% suppressed, as compared to PET, PP+PVC, and PP+F, respectively. Consequently PP+PET packaging effectively decreased the deterioration of A. elata and maintained marketability for 10 days of storage at 2℃.

• 한국식품저장유통학회지
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• 제21권2호
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• pp.231-238
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• 2014

재래식 간장에 표고버섯 및 천마를 첨가하여 일정기간 숙성시킨 후 분리하여 이화학적 성질 등의 변화를 측정하였다. NaCl의 함량은 대조구에 비해 실험구가 높게 나타났으며, 다른 재래식 방법으로 제조한 간장에 비해 전체적으로 염도가 낮았다. pH의 변화는 숙성이 될 수록 감소하였으며 총당과 환원당의 함량 또한 대조구에 비해 실험군이 높은 값을 보였는데 표고버섯이나 천마로부터 유래된 당의 영향으로 인해 높아진 것으로 판단된다. Protease 활성은 실험구가 6~8배 이상 높은 값을 보였고 항산화 활성에서는 천마간장이 총 폴레페놀 함량 90.23 mg/mL, 총 플라보노이드 함량 404.44 mg/mL로 가장 높은 값을 보였으며 전자 공여능 측정에서 버섯 간장이 72.71%를 나타냈다.

• 한국식품저장유통학회지
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• 제20권4호
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• pp.518-523
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• 2013

본 연구는 참외 껍질의 첨가가 배추 김치의 맛과 발효 숙성에 미치는 영향을 알아보기 위해 김치 제조에 절임배추 무게를 기준으로 참외 껍질 첨가량을 0, 10, 20, 30%(w/w)로 첨가량을 달리하여 김치를 제조한 후 $15^{\circ}C$에서 28일간 발효시키면서 pH, 산도, 총균수, 젖산균수 등의 이화학 및 미생물학적 특성을 조사하고, 관능적 특성인 맛과 색도, 씸힘성, 전체적인 기호도 등을 평가하였다. 참외 김치의 pH 변화는 발효 초기 모든 실험구에서 pH 4.76~4.87로 비슷하였으나, 대조구에서는 7~21일사이에 급격히 pH가 떨어져 과숙 현상을 보였으나, 참외 껍질 첨가구에서는 14일까지 유지하다가 14~21일 사이에 pH 4.13~4.41에 도달하여 28일까지 유지되었다. 참외 김치의 산도 변화는 초기에는 참외 껍질 첨가구에서 다소 높았으나, 발효가 진행되면서 오히려 대조구에 비해 낮은 산도 값이 나타났다. 참외 김치의 총균수를 측정한 결과, 발효 7일부터 참외 껍질 첨가구의 총균수가 대조구에 비해 낮게 관찰되면서 발효 마지막까지 유지되었다. 참외 김치의 젖산균 수를 관찰한 결과도 총균수와 비슷한 양상을 보였는데, 이것은 참외 껍질의 항균 작용에 의해 김치의 발효 및 숙성이 지연되는 것으로 생각된다. 참외 김치의 관능검사 결과, 맛은 20%와 30% 참외 깝질 첨가구에서, 씸힘성은 20% 참외 껍질 첨가구에서 대조구에 비해 유의적으로 높게 나타났으며, 전체적인 기호도에서는 참외 껍질 20% 첨가구이 가장 높은 선호를 나타내었다. 이상의 결과에서 배추 김치에 참외 껍질을 20% 첨가한 처리구가 이화학 및 미생물학적인 실험 결과에서 발효를 지연시키고 적숙기를 연장시켜 주었으며, 관능 검사 결과의 전반적인 기호도에서도 높은 점수를 나타내었다. 따라서 배추 김치를 담글 때 참외 껍질을 첨가하는 것이 발효를 지연시켜 맛과 저장성을 향상시켜 줄 것으로 기대된다.

• 한국식품저장유통학회지
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• 제20권1호
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• pp.45-51
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• 2013

UV-C 및 전자선 조사에 의한 막걸리의 품질변화를 측정하기 위하여 생막걸리를 UV-C 및 전자선 조사하고 $4^{\circ}C$에서 15일간 저장하여 이에 따른 품질 변화를 측정하였다. UV-C 및 전자선 조사에 의한 미생물 분석 결과, 전자선 조사가 UV-C 조사보다 막걸리 내 미생물을 제어하는 데 더 효과적인 기술로 확인되었다. UV-C 또는 전자선 및 저장기간에 따라 pH가 증가하는 경향을 보였다. 산도 측정 결과, 저장기간에 따라 UV-C 및 전자선 조사군이 대조군보다 산도가 유의적으로 증가하는 경향을 보였다. 명도의 경우 UV-C 및 전자선에 의해 그 값이 증가하는 경향을 보인 반면 저장기간이 증가함에 따라 감소하는 경향을 보였다. 적색도는 전자선 처리군이 다른 처리군에 비해 높은 값을 보였으며, 저장기간에 따른 변화는 일관적이게 나타나지 않았다. 황색도는 UV-C 및 전자선 조사에 따른 변화는 일관적이지 않았으나 저장기간에 따라 값이 증가하는 경향을 보였다. 환원당 함량 측정 결과 저장 초기 UV-C 및 전자선 조사에 의해 함량이 높았으나, 저장기간에 따라 대조군에 비해 빨리 감소하였다. 따라서, 전자선 조사가 UV-C 조사보다 막걸리 내 미생물을 효과적으로 제어할 수 있다고 판단된다. 그러나 막걸리에의 UV-C 또는 전자선 조사로 인해 발생되는 품질변화를 최소화하기 위한 방법 및 UV-C 또는 전자선 조사에 의한 화학적 특성 변화의 규명에 대한 지속적인 후속연구가 필요할 것으로 판단된다.

• 한국식품저장유통학회지
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• 제19권6호
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• pp.873-881
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• 2012

본 연구에서는 참죽 순의 간장 절임 조건에 따른 품질 특성을 조사하였다. 그 결과 참죽 순의 pH 및 산도 변화는 감초를 첨가한 구간에서 조금 적게 감소하는 경향을 나타내었다. 가용성 고형분 함량 및 염도 변화는 저장 기간이 경과할수록 서서히 감소하는 경향을 나타내었다. 참죽 순의 색도 변화는 저장 기간이 경과할수록 간장에 의해 녹색에서 어두운 녹색으로 변화하는 경향을 나타내었다. 참죽 순의 조직감 변화는 특유의 특성에 따른 차이를 나타냈으며, 감초를 첨가한 구에서의 변화가 적은 것으로 나타났다. 그리고 관능적 특성은 P1-1구간에서 전반적으로 가장 높게 나타났다. 간장 절임액의 pH 및 산도 변화는 저장 기간이 경과할수록 감소하는 경향을 나타내었다. 가용성 고형분 함량 및 염도 변화는 크게 나타나지 않았으며, 설정된 조건에서 저장 기간 동안 미생물 변화는 나타나지 않았다. 이상의 결과에서 참죽 간장 절임액 조건 및 절임 기간 중 품질 변화에 관한 조건이 설정되어 참죽을 이용한 다양한 절임식품의 상용화가 가능 할 것으로 기대되었다.

• 한국제4기학회지
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• 제18권2호통권23호
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• pp.19-22
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• 2004

Seasonal changes of topograpy, sediment grain size and accumulation rate on the Gomso-Bay tidal flat(Fig. 1), west coast of Korea, have studied in order to understand the seasonal accumulation pattern and preservation potential of tidal-flat sediments. Seasonal levelings across the tidal flat show that the landward movement of both intertidal sand shoals and cheiers accelerates during the winter and typhoon period, but it almost stops in summer when mud deposition is instead predominant on the middle to upper tidal flat. Seasonal variations of mean grain size were largest on the upper part of middle tidal flat where summer mud layers were eroded during the winter and typhoon periods(Fig. 2). Measurements of accululation depths from sea floor to basal plate reveal that accumulation rates were seasonally controlled according to the elevation of tidal-flat surface(Table 1) : the upper flat, where the accumulation rate of summer was generally higher than that of winter, was characterized by a continuous deposition throughout the entire year, whereas on the middle flat, sediment accumulations were concentrated in winter realtive to summer, and were intermittently eroded by typhoons. The lower tidal flat were deposited mostly in winter and eroded during summer typhoons. Cancores taken across the tidal flat reveal that sand-mud interlaers resulting from such seasonal changes of energy regime are preserved only in the upper part of the deposits and generally replaced by storm layers downcore(Fig. 3). Based on above results, it is suggested that the storm deposits formed by winter stors and typhoons would consist of the major part of the Gomso-Bay deposits(Fig. 4).

• 한국가축번식학회지
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• 제16권4호
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• pp.301-310
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• 1993

This experiment was performed to develop simple practical methods for short term preservation of rabbit embryos. A total of 55 cross bred does were superovulated by intramuscular injection of PMSG and HCG. Embryos were recovered at 25~30 hrs, 60~65 hrs and 80~85 hrs after mating and selected by morphological examination. Four cell stage, morulae and blastocyst embryos were stored in PBS enrich with 1, 10, 20 and 40% heat-treated FCS at 4, 20, 30 and 37$^{\circ}C$, respectively. Embryos were examined morphologically at 24, 48 and 72 hrs following storage. The result obtained in this experiment were summarized as follows: The superovulation was induced by PMSG 200 IU and HCG 100 IU. The average number of ovulation points and embryos recovered by collection time were 19.0, 15.6(25~30 hr), 17.3, 13.5(60~65 hr) and 19.2, 14.4(80~85 hr), respectively. And recovery rates of embryos recovered at 25~30 hr, 60~65 hr and 80~85 hr after mating were 62.8%(4 cell), 84.7%(morulae) and 79.6%(blastocyst), respectively. On the other hand, the average number of ovulation points collected by the no, of operations for the repeated collection was 17.3(60~65 hr), 19.2(80~85 hr) in 1st and 9.4(60~65 hr), 10.6(80~85 hr) in 2nd surgery, respectively. There was a significant decrease(P<0.05) in the number of ovulation points the 2nd surgery as compared to the 1st surgery. All of the 4-cell stage embryos stored at 4$^{\circ}C$ for 48 hrs showed the same morphology throught the storage period, on the contrary, 4-cell stage embryos stored at 2$0^{\circ}C$ and 3$0^{\circ}C$ for 48 hrs showed degeneration embryos and stored at 37$^{\circ}C$ for 24 hrs showed degeneration embryos. Morulae and blastodcyst stored at 4, 20, 30 and 37$^{\circ}C$ for 24 hrs showed degeneration embryos. All of the blastocyst stored at 37$^{\circ}C$ for 72 hrs showed degeneration embryos.

• Asian-Australasian Journal of Animal Sciences
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• 제9권1호
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• pp.91-99
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• 1996

About 7.7 million tons of straw dry matter are being rotten during the monsoon. The objective of this trial was to develop a technique to preserve straw under wet condition. To simulate the moisture content of wet straw, a dry straw was deeped overnight in water. After draining the excess water, the wet straw(668 g moisture $kg^{-1}$) was divided into twenty fractions and preserved with 0, 30, 50 ro 70 g urea $kg^{-1}$ dry matter for either of 30, 60, 90, 120 or 180 days in sealed plastic container. Considering the colour, smell, fungal infestation and pH, the wert straw was preserved excellently up to 180 days when 50 or 70 g of urea per kg DM was used. Urea preservation increased the crude protein contents of straw by 3.6 to 6.4 times (174 to $364g{\cdot}kg^{-1}$) over that of the dry straw ($48g{\cdot}kg^{-1}$). Although the NDF content of straw was not effected by the level of urea or by the length of the preservation period, but the ADF content increased (p > 0.05) by 0.086 to $0.889g{\cdot}kg^{-1}$ straw DM for each g increase in the urea level. At 48 hours, the DM degradability of dry straw was $350g{\cdot}kg^{-1}$, which increased to $633g{\cdot}kg^{-1}$ when preserved with 50 g urea $kg^{-1}$ for 180 days. For the same straw, both the rate(0.0388 vs. 0.0136 fraction $h^{-1}$), the extent(717 vs. $631g{\cdot}kg^{-1}$) of straw degradation and the estimated ME(9.55 vs. $6.51MJ{\cdot}kg^{-1}$ straw DM) were higher in the preserved than the dry straw.

• Asian-Australasian Journal of Animal Sciences
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• 제21권2호
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• pp.190-197
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• 2008

This study was designed to analyze boar sperm to compare motility, acrosome morphology, viability and ATP by various preservation methods between Duroc boar A with cold shock resistance sperm and Duroc boar B with cold shock sensitivity sperm. Semen volume, sperm concentration, motility and normal acrosome between Duroc boar A and B did not show any differences within 2 h after collection. There were no differences in sperm motility and normal acrosome between boar A and B at 1 day of preservation at $17^{\circ}C$ and $4^{\circ}C$, respectively. However, sperm motility and normal acrosome from 2 day of preservation at $17^{\circ}C$ and $4^{\circ}C$, respectively, were higher for boar A than boar B. The frozen-thawed sperm motility and normal acrosome were higher for boar A than boar B. The sperm viability and ATP concentration according to storage period of liquid semen at $17^{\circ}C$ and $4^{\circ}C$ were higher for boar A than boar B. Also, the sperm viability and ATP concentration of frozen-thawed semen were higher for boar A than boar B. In conclusion, we found out that the original quality of boar semen with cold shock resistance sperm played an important role.

• Journal of Korean Neurosurgical Society
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• 제42권4호
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• pp.286-292
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• 2007

Objective : Gamma Knife Stereotactic Radiosurgery (GK SRS) has become an important treatment modality for vestibular schwannomas. We evaluated the tumor control rate, patterns of tumor volume change and preservation of hearing following low-dose radiation for vestibular schwannomas in a homogeneous cohort group in which the mean marginal dose was 12 Gy. Methods : A total of 59 patients were enrolled in this study. All enrolled patients were followed-up for at least 5 years and the radiation dose was 11-13 Gy. Regular MRI, audiometry and clinical evaluations were done and tumor volumes were obtained from MRI using the OSIRIS program. Results : The tumor control rate was 97%. We were able to classify the patterns of change in tumor volume into three categories. Transient increases in tumor volume were detected in 29% of the patients and the maximum transient increase in tumor volume was identified at 6 to 30 months after GK SRS. The transient increases in tumor volume ranged from 121% to 188%. Hearing was preserved in 4 of the 12 patients who had serviceable hearing prior to treatment. There were no other complications associated with GK SRS. Conclusion : Low-dose GK SRS was an effective and safe mode of treatment for vestibular schwannomas in comparison to the previously used high-dose GK SRS. Transient increases in tumor volume can be identified during the follow-up period after low-dose GK SRS for vestibular schwannomas. Physicians should be aware that these increases are not always indicative of treatment failure and that close observation is required following treatments. Unfortunately, a satisfactory hearing preservation rate was not achieved by reducing the radiation dose. It is thought that hearing preservation is a more sophisticated problem and further research is required.