고구마 괴근의 섬유질 분리 조건 탐색 및 품종별 섬유질 함량 차이

• Published in: Korean journal of crop science Vol. 68; no. 1; pp. 20 - 26
• Main Authors: 박원, Won Park, 이임빈, Im Been Lee, 정미남, Mi Nam Chung, 이형운, Hyeong-un Lee, 김태화, Tae Hwa Kim, 이교휘, Kyo Hwui Lee, 남상식, Sang Sik Nam
• Format: Journal Article
• Language: Korean
• Published: 한국작물학회 01.03.2023
• Subjects: fiber; sieve; storage root; sweetpotato; variety; 농학; fiber; storage root; sieve; variety; sweetpotato
• ISSN: 0252-9777; 2287-8432

Fiber content in the storage roots of sweetpotato varies between different varieties. For examples, the high fiber content of certain types has a poor texture when steamed or roasted. This study was conducted to evaluate the optimal sieve mesh size for separating fibers, the chemical composition of fibers and differences in fiber content among different varieties. We found that the separated fiber content (dry weight) of mashed and steamed sweetpotato was higher after washing three times (143.3 mg/100 g) compared with that washed five times (128.4 mg/100 g). The Hogammi variety remained 85.9% of total fiber content at 10 mesh (2,000 μm) and 9.6% of total fiber content at 30 mesh (600 μm), and Jinyulmi remained 74.9 and 16.7% of total fiber content , respectively. Therefore, a 30 mesh sieve was considered the most suitable for fiber separation. Among the 10 studied cultivars, Jinhongmi showed the lowest amount of fiber (24.8 mg/100 g) and Hogammi had the highest amount (111.4 mg/100 g), which was 4.5 times larger than that of Jinhongmi. Cellulose, hemicellulose and lignin content of separated fibers showed no difference between the viscous-type Hogammi and powdery-type Jinyulmi varieties, with averages of 32.5, 22.3 and 29.6%, respectively. Correlation results using the Image J program showed a significant correlation between the distribution of the stained area and the fiber content (R = 0.74, p < 0.05). Staining distribution differed among varieties, suggesting that a simple fiber content test could be performed using the staining method on raw sweetpotato. These results provide useful information to help inform farmers on the fiber content of different sweetpotato varieties.