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2019 Vol.28, Issue 3 Preview Page
Effects of Chlorine Water and Plasma Gas Treatments on the Quality and Microbial Control of Latuca indica L. Baby Leaf Vegetable during MA Storage

염소수와 플라즈마 가스 처리가 왕고들빼기 어린잎채소의 MA저장 중 품질과 미생물 제어에 미치는 영향

Ju Young Kim1
,
Su Jeong Han1
,
Lixia Whang1
,
Joo Hwan Lee1
,
In-Lee Choi12
,
Ho-Min Kang12*
김 주영1
,
한 수정1
,
왕 립1
,
이 주환1
,
최 인이12
,
강 호민12*
1Division of Horticulture and Systems Engineering, Program of Horticulture, Kangwon National University, Chuncheon 24341, Korea
2Agricultural and Life Science Research Institute, Kangwon National University, Chuncheon 24341, Korea
1강원대학교 원예·시스템공학부 원예과학전공
2강원대학교 농업생명과학연구원
*Corresponding author: hominkang@kangwon.ac.kr
30 July 2019. pp. 197-203
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Abstract

This study was carried out to investigate the effect of chlorine water and plasma gas treatment on the quality and microbial control of Latuca indica L. baby Leaf during storage. Latuca indica L. baby leaves were harvested from a plant height of 10cm. They were sterilized with 100μL·L-1 chlorine water and plasma-gas (1, 3, and 6hours), and packaged with 1,300cc·m-2·day-1·atm-1 films and then stored at 8±1?and RH 85±5% for 25days. During storage, the fresh weight loss of all treatments were less than 1.0%, and the carbon dioxide and oxygen concentrations in packages were 6-8% and 16-17%, respectively for all treatments in the final storage day. The concentration of ethylene in the packages fluctuated between 1-3μL·L-1 during the storage and the highest concentration of ethylene was observed at 6 hours plasma treatment in the final storage day. The off-odor of all treatments were almost odorless, the treatments of chlorine water and 1 hour plasma maintained the marketable visual quality until the end of storage. Chlorophyll content and Hue angle value measured at the final storage day were similar to those measured before storage in chlorine water and 1 hour of plasma treatments. E. coli was not detected immediately after sterilization in all sterilization treatments. After 6 hours of plasma treatment, the total bacteria fungus counts were lower than the domestic microbial standard for agricultural product in all sterilization treatments. The total aerobic counts in the end storage day increased compared to before storage, whereas E. coli was not detected in all sterilization treatments. The sterilization effect against bacteria and fungi was the best in chlorine water treatment. Plasma treatment showed sterilization effects, but within a prolonged period of time. In addition, the sterilization effect decreased gradually. These results suggest that chlorine water and plasma treatment were effective in maintaining Latuca indica L. baby Leaf commerciality and controlling microorganisms during postharvest storage.

Keywords
chlorophyll
E. coli
off-odor
total aerobic counts
total fungal counts

본 연구는 왕고들빼기 어린잎의 염소수 및 플라즈마 처리가 저장 중 품질 및 미생물 제어에 미치는 영향을 알 아보고자 수행하였다. 초장이 10cm 수준에서 수확한 왕고 들빼기 어린잎을 100ppm의 염소수와 플라즈마 가스로 1, 3, 6시간동안 살균 처리한 후 산소투과도가 1,300cc·m-2 ·day-1·atm-1인 OTR(oxygen transmission rate) 필름을 사용 하여 포장하였고, 8±1oC의 저장 온도와 상대 습도 85±5% 의 조건에서 25일간 저장하였다. 저장 중 생체중 감소율 은 모든 처리구가 1.0% 미만을 보였고, 저장 종료일 모 든 처리구의 포장 내 산소 농도는 16-17%을 보였고, 포 장 내 이산화탄소 농도는 6-8%의 수준을 보였다. 포장 내 에틸렌 농도는 저장 기간 중 1-3μL·L-1의 수준으로 증 감을 반복하였는데, 저장 10일째부터 저장 종료일까지 플 라즈마 6시간 처리구가 가장 높은 농도를 보였다. 모든 처 리구의 이취는 거의 느껴지지 않는 수준이었고, 염소수 및 플라즈마 가스 1시간 처리가 저장 종료일까지 상품성을 유지하였다. 저장 종료일에 조사한 엽록소 함량과 Hue angle 값은 염소수와 플라즈마 1시간 처리가 저장 전과 유 사한 수준으로 높은 수준을 유지하였다. 살균 처리 직후 모든 살균 처리구에서 대장균은 검출되지 않았고, 총 세균 및 총 곰팡이 수는 플라즈마 6시간 처리구를 제외한 모든 살균 처리구에서 국내 미생물 허용 기준을 충족하였다. 저 장 종료일 조사한 총 미생물수는 저장 전에 비해 증가하 였으나 대장균은 모든 살균 처리구에서 검출되지 않았다. 세균과 곰팡이에 대한 살균효과는 염소수 처리가 가장 우 수하였고, 플라즈마 처리구는 살균효과는 나타났으나 처리 시간이 길어짐에 따라 그 효과는 미비하였다. 위의 결과를 종합해보면, 왕고들빼기 어린잎은 염소수 처리 및 단시간 플라즈마 처리 시 황화 및 부패 억제를 통한 상품성 유지 및 미생물 제어에 효과가 있는 것으로 판단된다.

키워드
대장균
엽록소
이취
총 곰팡이수
총 세균수
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Information
  • Publisher :The Korean Society for Bio-Environment Control
  • Publisher(Ko) :(사)한국생물환경조절학회
  • Journal Title :Protected Horticulture and Plant Factory
  • Journal Title(Ko) :시설원예ㆍ식물공장
  • Volume : 28
  • No :3
  • Pages :197-203
  • Received Date : 2019-03-13
  • Revised Date : 2019-04-25
  • Accepted Date : 2019-05-27
  • DOI :https://doi.org/10.12791/KSBEC.2019.28.3.197
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