Abstract
The effect of chitosan and cacium treatment on the quality of satsuma mandarin(Citrus unshiu Marc. var. miyagawa) during storage were investigated. Citrus fruits treated with 2000-folds diluted iminoctadime-triacetate solution or 1.5% chitosan with 0.5% CaCl$_2$ solution were stored at 4$\^{C}$ and 87$\pm$3% relative humidity, and room temperature without humidity control. Decay ratio of chitosan and calcium treated fruits were lower than the ones with no treatment from the mid of February. Also, citrus fruits treated with chitosan and calcium treated less in weight loss, that seems it was derived from restraining of fruits' transpiration. Soluble solids were maintained higher level in chitosan and calcium treated fruits than with no treatment during the storage. Acid contents were decreased gradually lower in cold storage than in room temperature storage, and there was not showed consistent trend among treatments. 26 kinds of free amino acids among 45 standards such as glutamic acid, threonine, serine, alanine γ-amino buryric acid, aspragine and etc were detected in Citrus unshiu Marc. var. miyagawa. As the storage time was prolonged, free amino acid was disappeared more or less, and the deccreasing extent was less in 4$\^{C}$ than in room temperature storage.
감귤의 저장 중 손실율을 줄이고 신선도를 유지하기 위하여 베프란, 키토산과 CaCl$_2$을 처리하고 상온저장과 4$^{\circ}C$, 87$\pm$3%의 조건에서 저장하면서 궁천조생 온주밀감의 품질변화를 검토하였다 온주밀감의 저장기간 중 부패율은 2월 중순부터 상온 및 저온저장에서 무처리에 비하여 2000배 희석한 베프란 용액, 0.5% CaCl$_2$를 함유한 1.5% 키토산 용액을 처리한 감귤이 부패과 발생이 매우 낮았다. 또한, 키토산과 CaCl$_2$을 처리한 감귤에서 중량감소도 적게 나타나, 증산작용을 억제하는 효과가 있는 것으로 여겨졌다. 저장기간 중 가용성고형물 함량은 무터리에 비하여 키토산과 CaCl$_2$을 처리한 것에서 약간 높게 나타났으나 유의성은 없었다. 산 함량은 상온저장에 비하여 저온저장에서 감소되는 폭이 적었으며, 처리간에 일정한 경향은 볼 수 없었다. 감귤의 주요 유리아미노산은 glutamic acid, threonine, serine, alanine${\gamma}$-amino buryric acid, asuagine 등 26종이 검출되었다. 전체적으로 저장기간이 경과할수록 감소되는 경향을 보였으며, 상온저장보다 4$^{\circ}C$ 저장에서 감소되는 량이 적었다.
