천연항균물질을 침지 및 포장소재로 이용한 딸기의 저장효과

Preservative Effect of Natural Antimicrobial Substances Used as Steeping and Packaging Agent on Postharvested Strawberries

  • 정순경 (양산대학 식품가공제과제빵과) ;
  • 조성환 (경상대학교 식품공학과, 농업생명과학연구원)
  • 발행 : 2003.03.01

초록

딸기를 항균소재에 침지 처리한 후 1% 농도로 항균성 소재를 첨가시킨 저밀도폴리에틸렌(LDPE) 필름에 의하여 딸기를 싸서 포장하고 5$^{\circ}C$에 저장하면서 미생물 성장, 부패율, 텍스쳐, 화학적 품질을 측정한 결과 대조구에 비교해서 긍정적인 결과를 얻을 수 있었다. 즉, 항균성 소재를 포함시킨 LDPE 필름은 무첨가 대조 필름에 비해 호기성 총균수, 효모/곰팡이수로 측정된 미생물의 증식을 억제하는 것으로 나타났다. 이러한 미생물 증식억제의 효과로 인하여 항균성 필름은 포장된 딸기의 부패율을 낮추어 주고, 연화를 억제하였다. 딸기의 저장 중 pH는 상승하고 적정산도는 감소하였으며 가용성 고형분은 감소하는 경향을 보였으나 포장 처리구간에는 유의하고 일관성있는 차이를 발견할 수 없었다. 대조구 LDPE에 비교해서 항균필름의 효과를 재확인 할 수 있었으며, 황련추출물 및 GFSE등과 같은 항균소재에의 침지 처리과정을 항균필름 포장 방법과 병행하여 사용함으로써 딸기의 신선도를 연장하는 효과를 극대화 할 수 있음을 확인하였다. 이상의 연구결과로 미루어, 본 연구에서 그 기능과 효과를 구명한 천연항균소재는 수확한 딸기의 항균용처리제재 및 포장 필름 소재로 선도유지효과를 기대할 수 있어, 딸기의 생산기반 보호와 농가소득에 큰 도움이 될 것으로 생각된다.

Coptis chinensis extract and grapefruit seed extract, natural antimicrobial substances, were applied to the dipping treatment of strawberry and incorporated in the packaging films. Strawberry was steeped in the extract solutions of 50 ppm concentration and packed with the low density polyethylene(LDPE) films incorporated with 1% extracts. During the storage at 5$^{\circ}C$, the qualities of microbial counts, awぶy ratio, texture and chemical attributes were measured for the pretreated strawberry. The LDPE films incorporated with the extracts retarded the growth of aerobic bacteria, lactic acid bacteria and yeast that had been contaminated before the pretreatment, significantly lowed the decay ratio, and gave better retention of textural firmness. The chemical and physical qualities of strawberry were not affected by the packaging films. When strawberry was steeped in the extract solutions, the effects of the packaging film incorporated with the extracts on the qualities of strawberry were accelerated.

키워드

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