Browse > Article

Physical Properties of Pericarp in a Walnut Cultivar, 'Yongdong'  

Lee, Uk (Department of Forest Genetic Resources, Korea Forest Research Institute)
Lee, Moon-Ho (Department of Forest Genetic Resources, Korea Forest Research Institute)
Byun, Kwang-Ok (Department of Forest Genetic Resources, Korea Forest Research Institute)
Jung, Myung-Suk (Department of Forest Genetic Resources, Korea Forest Research Institute)
Publication Information
Journal of Korean Society of Forest Science / v.96, no.4, 2007 , pp. 455-461 More about this Journal
Abstract
This research was processed on morphological and physical characteristics of 'Yongdong' cultivar nuts. (1)Morphological properties of 'Yongdong' cultivar nuts were significantly different from the control, native species, in respect of all properties. (2) 'Yongdong' cultivar nuts showed higher figures than the native species on 9 items of morphological properties (kernel weight, size, length and width of pad on suture and etc.), whereas other 6 items (height of pad on suture, thickness of shell and septem, fragment numbers of isolated kernel, roundness index, and etc.) showed lower figures than those of the control. (3) In physical properties of the nut shells, 'Yongdong' cultivar was superior to the control at all items with the exception of compressive prove distance. Accordingly, it was also verified as effective cultivar of shelled walnut with suture line direction applied the minimum strength. (4) 'Yongdong' cultivar, 21.9 kg, was approximately twice lower than the control, 42.6 kg, on maximum compressive weight. It was demonstrated that the 'Yongdong' cultivar characterized by easily crushing shell by small strength was great in cracking properties. (5) On the study of yield strength, the native species being twice higher than 'Yongdong' cultivar showed the properties of the small elasticity and the shell hardness. While, the suture line of 'Yongdong' cultivar having the lowest yield strength 15.6 kg and 16.0 kg was identified the shell crushed easily. (6) The movement distance of the compressive prove of 'Yongdong' cultivar, 4.2 mm, was longer than that of the control, 2.7 mm. Subsequently, it means that the amount of loss possibly occurring to distribution process was not great, whereby productive value was high. (7) The compressive strength of the suture line of 'Yongdong' cultivar, $9.1kg/cm^2$, was much lower than total average of that $12.4kg/cm^2$. It was also statistically different with other properties. (8)The hardness examination by the compressive position revealed that the suture line of 'Yongdong' cultivar, $149.8kg/cm^2$, was lowest in contrast with the control, $300.9kg/cm^2$.
Keywords
Cracking; maximum weight(MAXG); yield strength(YLD); distance(DST); compressive strength(STR); Hardness(HAD);
Citations & Related Records
연도 인용수 순위
  • Reference
1 강춘기. 1990. 우리나라 과실류의 역사적 고찰. 한국식 문화학회지 5(3): 301-312
2 박원종, 이승기, 김현태, 정혜경, 강명화. 2002. 포도씨의 기계적 특성-항복강도와 극한강도 측정. 산업식품공학 6(4): 321-328
3 전상돈, 조응혁. 1990. 호도의 유통체계에 관한 연구-천 원군의 사례조사를 중심으로. 한국임학회지 79(2): 187-195
4 한재영, 이영춘, 김광옥. 2003. 내피제거 은행의 물리적 및 관능적 품질 특성. 한국식품과학회지 35(1): 84-91
5 홍지향, 김창수, 김재열, 김진현, 명병수, 정종훈, 박장우. 2005. 과실의 압축특성에 관한 연구. 바이오시스템공학 30(5): 280-284
6 Koya, O. A. and M. O. Faborode. 2005. Mathematical modelling of palm nut cracking based on Hertz's theory. Biosystems Engineering 91(4): 471-478   DOI   ScienceOn
7 Sinesio, F. and E. Moneta. 1996. Sensory evaluation of walnut fruit. Food Quality and Preference 8(1): 35-43   DOI   ScienceOn
8 Pliestic, S., N. Dobricevic, D. Filipovic and Z. Gospodaric. 2006. Physical properties of filbert nut and kernel. Biosystems Engineering 93(2): 173-178   DOI   ScienceOn
9 강화석, 전상헌, 이재선, 이귀현. 1994. 잣수확의 기계화 연구(I)잣 송이의 물리적 특성. 한국농업기계학회지 19(1): 9-16
10 Vursavus, K. and F. Ozguven. 2005. Fracture resistance of pine nut to compressive loading. Biosystems Engineering 90(2): 185-191   DOI   ScienceOn
11 민경선, 이상우, 어윤근, 서정덕, 맹성렬. 2002. 대추 및 대추가지의 물리적 특성. 한국농업기계학회지 27(4): 283-292
12 Braga, G. C., S. M. Couto, T. Hara and C. T. P. A. Neto. 1999. Mechanical behaviour of macadamia nut under compression loading. Journal of Agricultural Engineering Research. 72: 239-245   DOI   ScienceOn
13 Koyuncu, M. A., K. Ekinci, E. Savran. 2004. Cracking characteristics of walnut. Biosystems Engineering. 87(3) : 305-311   DOI   ScienceOn
14 김기복, 김만수, 정현모, 이상대. 2003. 저장기간에 따른 사과 과육의 기계적 특성 및 초음파 파라미터. 한국농 업기계학회지 28(3): 239-244
15 Shimadzu Co. 2000. Shimadzu Ez-Test program user's manual. Daego Co. 22p