• 한국식품저장유통학회지
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• 제4권1호
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• pp.53-59
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• 1997

Physicochemical properties affecting on the quality of Citrus unshiu Marc. var miyagawa and C. unshiu Marc. var, okitsu according to cultivation area in Cheju were investigated. Linear correlations (r>0.9) were showed between fruit size and peel thickness. There were much difference between cultivation areas in soluble solids of C. unshiu Marc. var. okitsu. The difference were not so much in soluble solids and acid contents of citrus fruits produced at same area below 65mm of fruit diameter, but the quality of large size fruits were inferior. Brix/Acid ratio could not be index for quality evaluation, because of individual deviation. Soluble solid content of citrus fruits produced in south Cheju was higher than that produced in north Cheju. Acid content and Brix/Acid ratio of citrus fruits produced in south Cheju was lower than that produced in north Cheju. The quality of C. unshiu Marc. var. miyagawa clad not so much difference between cultivation area, but the difference of quality were recognized significantly in C. unshiu Marc. var. okitsu.

• 한국식품저장유통학회지
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• 제2권2호
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• pp.251-257
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• 1995

In order to determine the quality of Citrus unshiu(medium cultivar of satsuma mandarin) produced in Cheju, citrus fruits sampled at sorting places and harvested directly on citrus tree in south and north area of Cheju were analyzed. The fruits were grown in size till early of November, and soluble solids were increased continuously after that. Compared with the quality of citrus fruits as a factor of soluble solids, firmness, total sugar, pH, and color index, the optimum harvest periods were supposed to be reasonable from early of December for C. unshiu Marc. var. yonezawa and C. unshiu Marc. var. hayashi, Fruit weights and peel thickness had a linear correlation with increasing fruit size, but soluble solids and acid contents had not a correlation. The selection of C. unshiu variety was needed to determine by the properties of storage.

• 한국식품저장유통학회지
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• 제3권2호
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• pp.105-111
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• 1996

The conditions of cold stroage of Citrus unshiu Marc. var. okitsu produced in Cheju were investigated. The changes of peel moisture contents soluble solids, total sugar, vitamin C and density were slightly occured, and decay ratio was below 20% on keeping freshness relatively till late of March during cold storage. After thats decayed citrus fruits were increased gradually mainly from cold injury with lower temperature and high humidity. The loss of fruit weight, decrease of fruit hardness, and decrease of acid content were occured gradually during cold stroage. Because of the difficulty of long term storage for Citrus unshiu, the conditions and periods of cold storage would be determined after considering the physicochemical properties of fruits every year.

• The Plant Pathology Journal
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• 제15권6호
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• pp.335-339
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• 1999

Citrus tristeza virus(CTV), an aphid-borne closterovirus, is one of the most destructive pathogens of citrus. It has caused rapid decline in growth, stem pitting and death in citrus trees. A reverse transcriptase polymerase chain reaction (RT-PCR) assay was developed for detection of CTV and investigation of the CTV infection status of citrus and its related cultivars in Cheju island. For RT-PCR based CTV detection, primers were designed to amplify 670bp of coat protein gene. A screening test for CTV in citrus cultivars was conducted from March to July in 1999. Seventy individual citrus trees representing 9 species of 3 genera were tested. The infection rates of CTV for leaves from the years or older trees of late maturing citrus varieties such as Yuzu (C. junos Sieb. ex Tanaka), Navel orange (C.sinensis Osbeck), Kiyomitanger (C. unshiu x C. sinensis), and Shiranuhi ((C. unshiu x C. sinensis) x C. reticulata) were 100%, 80%, 60%, and 60% respectively. The CTV infection rates in Early satsuma mandarins such as 'Miyagawa Early' Satsuma mandarins (C. unshiu Marc. var. Miyagawa) and 'Okitsu Early' Satsuma mandarins (C. unshiu Marc. var. Okitsu) were 100%, and 60%, respectively. CTV was not detected in Cheju native Dangyooja (C. unshiu Marc. var. Osbeck), Trifoliate orange (Poncirus trifoliata) and Kumquat (Fortunella margarita Swingle). In conclusion, RT-PCR assay can be successfully applied to the detection of CTV in citrus trees.

• 한국식품저장유통학회지
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• 제4권2호
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• pp.131-137
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• 1997

Effect of storage on the tree and quality of early cultivar of Citrus unshiu Marc. produced in Cheju according to harvest time were investigated. Soluble solids, acid content, flesh ratio, firmness and specific cavity of the fruits harvested at 27th of November were 12.0, 1.03%, 79.98%, 0.774kg-force, 0.912, respectively. Soluble solids, total sugar and reducing sugar were increased gradually, but acid content was decreased slightly as delayed in harvest time. Otherwise specific gravity and firmness were not shown in great during harvest time, color index(a/b) was increased sharply till late November and then remained in stationary phase. On these result, we recommend that the harvest time of early cultivar of Citrus unshiu Marc. would be during December because of wilting partly. Fully ripened-fruits harvested late, compared to ordinary harvest time, with cold storage would be kept more quality and freshness of fruits for fresh consumption than the fruits harvested early and stored at room temperature.

• Applied Biological Chemistry
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• 제41권2호
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• pp.141-146
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• 1998

조생온주의 적정 수확시기를 결정하기 위하여 선과장에서 수집한 시료와 감귤나무에서 시기별로 직접 수확한 시료의 이화학적 품질을 분석하였다. 궁천조생과 흥진조생 모두 10월 중순까지 감귤의 비대가 계속 일어났으며, 이후에도 당도는 계속하여 증가하였다. 나무에 달려 있는 위치에 따라서도 감귤의 크기가 다른 경향을 보였으며, 남쪽 방향의 중간 위치에 달려 있는 감귤이 품질면에서 비교적 우수한 것으로 나타났다. 감귤의 품질에 관여하는 가용성고형물, 경도, 총당, pH, 착색도 등을 종합적으로 볼 때 흥진조생의 경우 11월 하순에, 그리고 궁천조생의 경우 12월 초순에 수확하는 것이 품질면에서 좋을 것으로 보였다. 선과장에서 수집한 시료는 농가에서 관행수확시에 수확한 다음 상온저장 후에 시기별로 출하하기 때문에 정확한 수확시기를 결정하는데는 미흡한 것으로 여겨졌다.

• 생명과학회지
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• 제21권4호
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• pp.502-508
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• 2011

감귤 '성전온주'(C. unshiu Marc)와 '병감'(C. reticulate Blanco)을 교배하여 얻은 다배성종자에서 교잡실생을 생육초기에 효과적으로 식별할 수 있는 방법 얻고자 PCR 기법에 바탕을 둔 RAPD와 SRAP 방법을 수행하였다. UBC (9, 27, 229, 230, 254) 프라이머와 SRAP (F4/R27, F7/R14, F12/R10, F44/R62) 프라이머 조합들을 사용하여 55개의 교배종자에서 얻은 실생들을 조사한 결과 37개의 종자에서 교잡실생을 식별할 수 있었다. F7/R14프라이머 조합에서는 45.5% (25/55)의 교잡실생을 식별할 수 있었고, UBC27 프라이머에서는 50.9% (28/55)의 식별효율을 보였다. 성전온주와 병감의 교배종자에서 UBC27 프라이머와 F7/R14 프라이머조합을 동시에 적용하였을 때에는 33개(60%, 33/55)의 종자에서 교잡실생을 식별할 수 있었다. 따라서 RAPD와 SRAP를 이용하였을 때 다배성 종자에서 교잡실생을 생육초기에 효율적으로 식별할 수 있었다.

• 한국식품저장유통학회지
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• 제5권4호
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• pp.339-341
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• 1998

제주산 감귤의 유통방법에 따른 선도 변화를 조사하고 저온유통의 효과를 검토하였다. 유통 중 성분변화는 상온(17$^{\circ}C$)유통이 저온(5$^{\circ}C$)유통에 비해서 중량감소는 6% 증가, vitamin C는 1.91mg 감소, 당산비는 20% 증가함을 보였다. 상온유통에서 중량감소로 인하여 당산비가 높아져서 (16.11에서 21.75) 감귤의 맛과 선도가 감소된다. 현행 감귤수송은 상온유통을 하고 있으나 고품질 감귤에는 부적합한 것으로 나타나며 고품질 소량생산 지향의 생산 체계에 저온유통체계를 도입하는 것이 상품성 향상에 중요 할 것으로 사료된다.

• 한국식품저장유통학회지
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• 제6권1호
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• pp.7-10
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• 1999

Physicochemical properties of Satsuma mandarin(Citrus unshiu Marc. var. miyagawa) harvested in middle of November according to production areas of Cheju were investigated. Peel thickness of citrus fruits was ranged from 2.54mm to 3.13mm, and it was lower on fruits harvested in western areas than those of other areas in Cheju. Soluble solids were ranged from 10.1 to 12.0$^{\circ}$Brix, and it was lower on fruits harvested in southern areas. Acid contents of citrus juice were ranged from 1.28% to 1.42%, it was higher on fruits harvested in eastern areas, specific gravity of citrus fruits was ranged between 0.86 and 0.88. Flesh ratio was ranged from 75.1% to 77.6%, it was lower on fruits harvested in southern areas. Soluble solids, acid content and specific gravity harvested in southern areas of below 100m and over 150m sea level altitude were 11.8 and 11.2, 1.43% and 1.40%, 0.87 and 0.9, respectively. Fruits quality harvested in southern areas was better, compared to other harvest areas of Cheju.

• 대한약리학회지
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• 제10권2호
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• pp.31-37
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• 1974

Citrus unshiu Marc., a family of Rutaceae, has been used as antitussives, antiemetics, expectorants, spasmolytics, stomachics and digestants in oriental medicine. But there is few reports on the pharmacological effects of Citrus unshiu pericarpium. Present experiment was performed to observe the effects of the water extract of Citrus unshiu on isolated auricle and intestine in rabbits and blood pressure in rats and also to study on the active component on the cardiovascular system by means of thin layer chlomatography and spectrophotometer. 1. The water extract showed positive inotropic and positive chronotropic effect in the concentration of $1{\times}10^{-4}g/ml$, $5{\times}10^{-4}g/ml$, and $1{\times}10^{-3}g/ml$. 2. The motility of isolated rabbit intestine was significantly depressed by the water extract. 3. The blood pressure was markedly increased by the water extract. 4. The blood vessel of rabbit ear was constricted by perfusion of the ether extract. 5. The purified alkaloid of Citri pericarpium by ion exchange resin showed the same Rf value with l-synephrine on thin layer chromatography. 6. The purified alkaloid of Citri pericarpium by thin layer chromatography showed the same absorption curve with l-synephrine in the ultraviolet scanning.