잎상치를 $20{mu}m$ LDPE(perforated), $20{mu}m$ LDPE, $30{mu}m$ HDPE, $40{mu}m$ LDPE 필름으로 포장하여 $4^{circ}C,;10^{circ}C$ 및 $20^{circ}C$에서 저장 중 품질변화를 관찰하였다. 상치의 저장수명에 가장 크게 영향을 미치는 인자는 온도로서 저장온도 $4^{circ}C$에서 상치 품질이 가장 양호하게 보존되었으며, 무포장구와 비교하여 필름 포장구의 저장수명이 $10{sim}15$배 가량 더 연장되었다. 포장재질별로는 $20{mu}m$ LDPE(perforated)와 $20{mu}m$ LDPE 포장구에서 부패 및 변색이 발생하여 상치의 상품적 가치가 비교적 단기간에 저하되었다. 이에 반해 $30{mu}m$ HDPE와 $40{mu}m$ LDPE 포장구에서는 중량감소, 변색, 고형분 함량, 조직감, 부패 등 모든 상치의 품질면에서 우수한 결과를 나타내었으며, 특히 $40{mu}m$ LDPE 포장구에서 더 우수한 결과를 나타내었다.
Leaf lettuce (Lactuca sativa L., var. crispa) packed in $20{mu}m$ LDPE (perforated), $20{mu}m$ LDPE, $30{mu}m$ HDPE, and $40{mu}m$ LDPE pouches was stored at $4^{circ}C,;10^{circ}C;and;20^{circ}C$. The quality of leaf lettuce during the storage was investigated in terms of weight loss, color, soluble solids content, texture and sensory properties. Leaf lettuce exhibited the highest storage stability at $4^{circ}C$. Shelf-life of the packed leaf lettuce was prolonged approximately $10{sim}15$ times in comparision with that of the unpacked under all temperature conditions. Among the packed leaf lettuce, self-life in $20{mu}m$ LDPE (perforated) and $20{mu}m$ LDPE pouches was relatively short mainly due to discoloration and deterioration. On the other hand, the quality of the leaf lettuce packed in $30{mu}m$ HDPE and $40{mu}m$ LDPE pouches was kept well during the storage. Particularly, $40{mu}m$ LDPE pouches conferred the shelf-life superior to other film pouches.
