연신 폴리프로필렌 필름으로 진공 포장된 팽이버섯(Flammulina velutipes)의 저장성 향상
Extension of shelf-life in golden needle mushroom (Flammulina velutipes) according to pressure composition packaging using oriented polypropylene film
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초록
팽이버섯은 타 작물에 비해 수확 후 호흡률이 높아 갈변, 경도감소, 부패 등이 수확 즉시 진행되는 작물이다. 이러한 팽이버섯을 장기간 유통하기 위해 가장 많이 적용되는 방법은 진공 포장하여 저온 저장하는 것이다. 본 연구에서는 팽이버섯의 포장 후 유통기간을 연장에 더욱 적합한 진공필름을 선발하기 위해 $20{\mu}m$두께의 PE+PP, OPP 및 LDPE 필름으로 진공 포장하여 유통온도인 10℃의 저온에서 2주간 저장하였다. 일반적으로 많이 적용되는 LDPE 필름이 갈변, 줄기신장, 호흡률 급변, 조직 연화와 같은 변질이 포장 후 7일 이내로 가장 빠르게 진행되었다. 또한 OPP 필름보다 PE+PP가 수일 더 일찍 해체되기 시작하여 갈변 현상이 먼저 발생하였다. 최종적으로 OPP 필름이 안정된 호흡률과 외부색도, 신장억제 현상이 유지되어 LDPE 필름 포장군의 저장 7일차에 발생된 부패율보다 7일이 지연된 저장 14일차에 나타났다.
Abstract
The shelf-life of fresh mushrooms is notably limited because their browning, texture change, and decay are too fast after immediately harvest. Especially, the best management for extending golden needle mushroom’s shelf-life is modified atmosphere packaging under pressure vacuum at cold storage. In this study, three types of films, 20 μm polyethylene+polypropylene (PE+PP), oriented polypropylene (OPP), and low density polyethylene (LDPE) were tested to extend the shelf-life of golden needle mushrooms. Mushrooms were packed under pressure vacuum and stored at 10 °C for 2 weeks. The golden mushrooms in LDPE film as a commercial packaging, were highly perishable and immediately proceed deterioration as browning, elongation, fluctuation of respiratory quotient (RQ) and softening within 7 days after packaging. On the other hand, the mushrooms in OPP and PE+PP film shown that shelf-life were extend to 14 days from 7 days, causing delay breakup of vacuum and maintenance of color, length, and RQ during storage. The breakup of vacuum in PE+PP film was faster few days than OPP film packaging. This present study indicated that the golden needle mushrooms by OPP packaging under pressure vacuum treatment might be extended the shelf-life until approximately 14 days during cold storage.
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