• Korean Journal of Agricultural Science
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• v.36 no.2
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• pp.147-158
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• 2009

This study was conducted to investigate the effect of 1-MCP, market temperature and combination treatment of freshing agent with 1-MCP on fruit quality of 'Hong Bak' peach (Prunus persica Batsch). The 1-MCP treatment at the rate of 1000ppb showed the best results in delaying the firmness loss and skin color development during shelf life without any detrimental effects on fruit quality. Moreover, positive effects of 1-MCP on fruit quality parameters were more significant in the fruits stored at $30^{\circ}C$ of high temperature shelf life than those of $20^{\circ}C$. The combination treatment of carbon ceramic with 1-MCP showed a beneficial effects including a prevention of firmness loss and maintaining external appearance during the five days of room temperature storage of 'Hong Bak' peach.

• Korean Journal of Breeding Science
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• v.42 no.5
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• pp.495-501
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• 2010

Peaches (Prunus persica) are less popular than the fresh fruits, because their flesh gets soft faster. So many breeders focused on their aim to firmness. Other breeders focused on juiciness, flavor and aroma. Breeding requires much labor, time and money. To reduce these requirements, many scientists develop many SSR, CAPS and SCAR makers. New peach varieties bred in our National Institute of Horticultural & Herbal Science (NIHHS) such as, Cheonhong, Suhong and Harhong are yellow flesh cultivars and Yumyeong, Baekmijosaeng, Baekhyang, Jinmi, Soomee, Mihong, Misshong and Yumee are white flesh cultivars. These peach cultivars are planted in orchard of Korea. To assert breeding cultivar patents and prevent patent disputes, we detected cultivar-specific DNA fragment using 235 sets of Operon RAPD primers, analyzed 134 DNA sequences and constructed SCAR primers. To confirm the cultivar-specific SCAR markers, we applied candidate SCAR primers to 30 peach cultivars widely cultivated in Korea. These selected lines are included father and mother lines that were used to develop new varieties in NIHHS. Using fourteen SCAR primer sets, we characterized thirty cultivars selected. The SCAR marker is expected to serve as molecular evidence distinguishing different peach varieties.

• Korean journal of applied entomology
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• v.40 no.2
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• pp.117-123
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• 2001

The occurrence and damage by the oriental fruit moth, Grapholita molesta (Busck) were investigated on pear trees from 1996 to 2000 in the Naju, Korea. The number of overwintering larvae in pear trees considerably varied depending on the maturation time of varieties. The density of overwintering larvae on late cultivars such as Gamcheonbae and Okusankichi was high, but relatively low on early cultivars. Trunk and main branch of pear trees were main overwintering sites. In 1997, overwintering larvae began to pupate from middle February, and to emerge from late March. Male moths were caught in the sex pheromone traps from late March until early October with four peaks of flight in 1996~2000. In every generation larvae damaged both the shoots and fruits of pear tree, but the first and second generation larvae tended to damage mainly shoots, while most of the injured fruits were due to the third and fourth generation larvae. In pear fruits damaged by fruit moths, most of these were caused by oriental fruit moth larvae and none of pear fruits were damaged by peach fruit moth or pear fruit moth larvae in 1998~2000.

• Journal of the Korean Home Economics Association
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• v.19 no.4
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• pp.33-39
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• 1981

This study was attempted to determine the pectin contents of various fruits(Cherry, strawberry, plum, peach, apricot, apple, crabapple) and to investigate the changes in the properties of pectin and pectin gel during crabapple ripening. Methoxyl content, molecular weight and intrinsic viscosity were measured in ripened and unripened crabapples. In order to determine the characteristics of pectin gel, percent sag was measured by exchange Ridgelimeter, hardness and textural characteristics of jellies were measured by a penetrometer and a texturometer. The experimental results are summarized as follows: 1. The pectin contents of various fruits were 1.16% for cherry, 3.17% fir strawberry, 4.29% for plum, 5.51% for apricot, and pectin contents of peaches and apples varies depends on varieties from 4.54% to 5.61% to 6.52, respectively. The pectin contents of unripened and ripened crabapple wee 9.21% and 9.84% respectively, indicating that pectin content increased with fruit maturity. 2. The methoxyl contents, which was 6.61%~6.95%, was very low and it increased significantly during fruit ripening. Further, a decrease in acetyl content, intrinsic viscosity, molecular weight occurred during the ripening of crabapples. 3. The percent sag of crabapple jellies increased with fruit maturity from 5.26% to 5.79%, and the corresponding jelly grade decreased in ripened crabapple. 4. The hardness of jellies determined by a penetrometer was 79.15 pp.U. for ripened crabapple jelly, 90.62 pp.U. for unripe ned crabapple jelly. 5. In the textural characteristics of gels measured by a texturometer, the gels made from unripened crabapple were shown to have the highest values in hardness, cohesiveness, adhesiveness and gumminess.

• Korean journal of applied entomology
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• v.57 no.1
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• pp.33-38
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• 2018

Walnuts are one of the most economically important fruit trees in forestry. In walnut orchards, however, studies examining damage by insect pests are limited. This study was conducted to investigate the rate of damage caused by Conogethes punctiferalis to walnut fruits and by Acrocercops transecta to walnut leaves. In 2017, the change of damage rate (caused by C. punctiferalis) to fruits were investigated in Buyeo. In addition, we counted fruits and leaves damaged by two lepidopteran species in Gimcheon, Buyeo, Yeongdong, and Hwaseong. Damaged fruits steadily increased in abundance with fruit growth in Buyeo, and the highest number of damaged fruits was documented in late summer. The rates of damage caused by C. punctiferalis to fruits in Buyeo, Gimcheon, and Hwaseong were 22.1%, 20.5%, and 11.7%, respectively. Additionally, the rates of damage caused by A. transecta to leaves in seedlings (58.5% on average) were significantly higher than to those in older trees (11.2% on average), irrespective of the study location. In conclusion, this study showed that C. punctiferalis and A. transecta were serious pests affecting walnut fruits and leaves, respectively. Therefore, management methods for these insect pests need to be developed.

• Food Science and Preservation
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• v.15 no.3
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• pp.377-384
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• 2008

The gamma irradiation process was performed to prolong a shelf-life of peaches and the effects of a gamma irradiation on the nutritional, physiochemical and sensory characteristics of peaches were evaluated during a post-irradiation storage at $4^{\circ}C$ and $25^{\circ}C$. Nutritional, physiochemical and sensory characteristics of peaches were stable at 1 kGy of an irradiation, a recommended dose for fruits and vegetables by CODEX, and the viable cell counts of contaminated microorganisms were reduced by 2 decimal reduction, at this dose. After a 1-week storage at ambient condition, the microbiological quality of the 1 kGy irradiated peach was stable, while all the non-irradiated peaches were deteriorated Furthermore, cold storage enhanced the shelf-life of the gamma irradiated peach and the nutritional and physiochemical characteristics of the peaches were comparatively stable up to 6 weeks. Right after gamma irradiation, the sensory evaluation results were not different in any of the samples, and the sensory quality of the irradiated peaches was adequate for a 4-week storage at $4^{\circ}C$. Our results suggested that gamma irradiation at 1 kGy can be used to enhance the shelf-life of peach without a significant loss in the quality attributes, especially upon cold storage after radiation treatment.

• The Journal of Korean Medicine
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• v.32 no.1
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• pp.12-35
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• 2011

Objectives: The two criteria to clarify the toxicity of a herbal diet are well known. Although mechanical analysis of effective ingredients, a western approach, is widely used, the toxicity presence classification through the herbal analysis from a viewpoint of a theory of the herbal medicine properties has been disregarded. This study is for the safe use of a herbal diet through classification and study of toxicity presence in the herbal diet from the view of a theory of herbal medicine properties, one of the methods of Oriental Medicine. Methods: We classified and studied the toxicity presence in four kinds of herbal diets, waters and grains, animals groups, fruits and vegetables, and herbs and trees, excluding mineral natural drugs, of 1,400 kinds of medicines in 16 chapters of Tang-aec-pyeon, Dong-ui-bo-gam, for which the herbal analysis from a viewpoint of the theory of the herbal medicine properties has been used. The criteria of the toxicity presence in the herbal diet have been largely classified into the toxicant and the non-toxicant, and the toxicant is in turn classified into the insignificant, the medium and the significant. The category to clarify herbal diet has been limited to simultaneous utilization of food and natural drugs. The main text is Dong-ui-bo-gam, although diverse other references have also been used. Results: There are toxicant diets: a kind of tortoise meat of animals groups; five kinds of grains part in fruits and vegetables: aengdo, peach, oyat, small apple and gingko nut; and 12 kinds of vegetables part in fruits and vegetables: ginger, oriental cabbage, lettuce, chongbaek, onion, garlic, leek, fern, houttuynia cordata (myeol), pyeongji, geundae, and spinach, which should be prohibited from long-term use both as food and medicine. Conclusion: If herbal diet is used as health food supplements or food, the toxicity presence should be considered on the grounds of an Oriental Medicine theory of the herbal medicine properties.

• The Korean Journal of Food And Nutrition
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• v.33 no.2
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• pp.159-166
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• 2020

Melon is a fruit consumed and grown globally because of the sweet taste and pleasant aroma. The purpose of this study was to determine the quality characteristics and antioxidant activities of melon jams added with various fruits such as apple, aronia, blueberry, grape, kiwi, passion fruit, and peach. We determined quality characteristics such as pH, total acidity, antioxidant activity, content of total anthocyanin, polyphenol and tannin, respectively. The 100% melon jam as the control was the highest pH and lowest total acidity, whereas mixed jams with melon and passion fruit showed opposite results. The mixed jams with melon and aronia of the total anthocyanin, the polyphenol contents, tannin, and ABTS radical scavenging activities, were markedly higher than those of the control and other samples (p<0.001), followed by the mixed jams with melon and blueberry. In the taste sensing analysis, mixed jams with melon and passion fruit revealed higher richness and lower aftertaste-bitterness and aftertaste-astringency than the commercial strawberry jam and other samples. Thus, jams mixed with various fruits, in particular, aronia, blueberry, and passion fruit were superior to the 100% melon jam in terms of physiological activity and palatability.

• Korean Journal of Food Science and Technology
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• v.19 no.4
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• pp.317-323
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• 1987

This study was undertaken to examine the applicability of domestic enzymes in the quantitative determination of dietary fibers according to the official enzymatic-gravimetric method of AOAC and to apply it to 4 kinds of fruits (apple, pear, peach and persimmon) and 4 kinds of vegetables (Korean radish, lettuce, Korean cabbage and cabbage Kimchi). With domestic enzymes, an optimum condition was selected to use 1/10 units of enzyme activity and to extent the reaction time two-fold as compared with the recommended method, in the case of fruits and vegetables. On a dry matter basis, fiber contents of fruits were in the range of 9.4-28.8% total dietary fiber, 1.8-7.8% non-cellulosic polysaccharides, 3.7-5.8% cellulose and 1.3-21.3% lignin. Fiber contents of vegetables were 26.0-35.7% total dietary fiber, 11.3-14.4% non-cellulosic polysac-charides, 12.3-19.7% cellulose and 1.4-7.4% lignin. On a dry matter basis, crude fiber contents were 3.5-6.7%in fruits and 9.1-13.8% in vegetables. Therefore, crude fiber contents of fruits and vegetables accounted for only 12-50% of total dietary fibers.

• Proceedings of the Korean Society of Postharvest Science and Technology of Agricultural Products Conference
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• 2003.04a
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• pp.137.1-137
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• 2003

본 연구는 저장 중 부패된 복숭아(‘황도’)에서 Botrytis cinerea를 분리한 후 $25^{\circ}C$에서 배양 중 고농도 탄산가스 (35, 60, 100% + 24, 48, 72시간) 환경에서의 생장억제 효과를 구명하고 이에 따른 과실의 품질 변화를 고찰하였다. 실시한 모든 처리 농도에서 곰팡이 생장이 억제되었으며, 가스 농도 및 처리 시간의 증가에 의해 효과가 극대화되었다. 특히, 100% 탄산가스를 24, 48, 72시간 처리할 경우 5일 배양 후 곰팡이의 생장 정도는 무처리구에 비해 각각 25, 39, 46% 감소되었다. 고농도 탄산가스 처리 기간 동안 곰팡이 성장은 억제되었고 가스 환경이 제거될 경우 정상적인 생장을 재개하는 양상을 보였다. 수확된 ‘황도’ 과실을 대상으로 가스처리 효과를 검증한 결과 100% + 24, 48시간, 60% + 48시간 처리가 부패억제에 효과적인 것으로 나타났다. 35% 농도의 경우 효과가 미미하였다. 가스 처리에 따른 과실의 당도 변화는 없었으며 100% + 48시간 처리의 경우 경도가 높게 유지되었다.