• 한국식품조리과학회지
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• 제26권5호
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• pp.545-551
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• 2010

In this study, Sulgidduk samples were prepared with 0%, 3%, 5% and 7% yacon powder. Sulgidduk samples were then examined for quality characteristics such as moisture content, general components, color, texture profile analysis, sensory qualities, and sugar content, in order to determine the optimal ratio of yacon powder in the formulation. Regarding the general components of yacon Sulgidduk, the contents of crude protein and lipid decreased as the ratio of yacon powder increased. The L-value for color decreased, whereas a- and b-values increased. In the texture profile analysis, 7%-added yacon showed significantly lower hardness, whereas 7% yacon powder showed the highest values for cohesiveness, springiness, and chewiness. The contents of sucrose, fructose, and glucose in yacon Sulgidduk were found to be 3%, 5%, and 7% by LC, respectively. Sucrose showed a decreasing trend with increased yacon powder content, but fructose and glucose increased with increased amount of yacon powder. For sensory qualities, taste/flavor, texture, hardness, and overall acceptability were not significantly different among the 0%, 3%, and 5% yacon powder samples.

• Biomolecules & Therapeutics
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• 제21권2호
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• pp.153-160
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• 2013

We screened the pharmacological effects of a 50% ethanol extract of Yacon tubers and leaves on spermatogenesis in rats. As a result, we found that Yacon tuber extracts increased sperm number and serum testosterone level in rats. It has been reported that the crude extract of Yacon tubers and leaves contain phenolic acids, such as, chlorogenic acid, ferulic acid and caffeic acid by HPLC/MS analysis. We were interested in the contributions made by phenolic acid, particularly chlorogenic acid of Yacon tuber extract to the spermatogenic activity. After administering Yacon tuber extract or chlorogenic acid to rats for 5 weeks, numbers of sperm in epididymis were increased by 34% and 20%, respectively. We also administered ferulic acid, which has been reported to be a metabolite of chlorogenic acid and a constituent of Yacon tuber extract to investigate its spermatogenic activity in rats. Yacon tuber extract and ferulic acid increased sperm numbers by 43% and 37%, respectively. And, Yacon tuber extract, and chlorogenic acid showed significantly inhibition effect of testoeterone degradation in rat liver homogenate. We considered that the spermatogenic effect of Yacon tuber extract might be related to phenolic compounds and their inhibitory effect of testosterone degradation. Yacon showed the possibility as ameliorable agents of infertility by sperm deficiency and late onset hypogonadism syndrome with low level of testosterone.

• 약학회지
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• 제53권5호
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• pp.250-258
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• 2009

Male reproductive function seems to have deteriorated considerably in the past 4 to 5 decades. It was observed a significant decline in mean sperm counts from $113{\times}10^6/ml$ in 1940 to $66{\times}10^6/ml$ in 1990; a fall of $0.94{\times}10^6/ml/year$. We reported that Yacon tuber extracts have spermatogenic effects in rat. In the present study, we tested the spermatogenic effect of Yacon tuber extracts in healthy male volunteers. Subjects were assigned randomly to the control group and the Yacon ethanol extracts administered group (each 12 subjects). And, placebo or Yacon tuber extracts (100 ml) were administered two times daily, by oral for 3 months. Sperm numbers, biochemical parameters and hormone levels were recorded before starting administration, then every month. The Yacon tuber extracts administered group showed significant time dependant increases in according to administration period. Especially, the numbers of sperm increased by 54% after 3 months of administration. And, in Yacon tuber extracts administered group, testosterone and estradiol level were significantly higher than placebo group. On the other hands, Yacon tuber extracts didn't show any toxicity in glucose and lipid metabolism and liver and kidney function. The results of the present study suggest that Yacon tuber extract is a possible therapeutic for the treatment of sperm deficiency.

• 동아시아식생활학회지
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• 제22권3호
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• pp.378-385
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• 2012

This study carried out to investigate the effects of yacon powder on yellow layer cake made with weak flour. After making yellow layer cake with yacon powder, water activity, crumb texture, crumb color, and sensory characteristics were investigated. After 1 day of storage, Aw value of control cake with weak flour did not show any significant differences, whereas those with 2, 4, and 6% yacon powder showed a significant increase in Aw. During storage, the Aw values of yellow layer cakes containing yacon powder decreased. Hardness and gumminess of yellow layer cakes containing yacon powder decreased compared to those of control, whereas springiness and cohesiveness of yellow layer cakes increased compared to those of control. Hardness, springiness, cohesiveness, and gumminess all increased with storage time. Further a higher percentage of yacon powder was associated with lower L and b values as well as a higher a value. The micrographs of yellow layer cakes with yacon powder showed slightly coarser porosity than that of control. The results of the sensory test showed that the overall acceptability of 2% yacon powder cake was the highest.

• 한국식품조리과학회지
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• 제26권3호
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• pp.263-271
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• 2010

The purpose of this study was to measure the antioxidant activity of yacon root and to manufacture yacon pickles for commercialization as a functional food. The total phenol content in yacon roots were the highest, 29.96 mg GAE/ 100 g, in the ethyl acetate fraction and the DPPH radical scavenging activity and ABTS radical scavenging activity was 37.07%, and 91.60%, respectively, in the ethyl acetate fraction. The optimum recipe for the pickling solution was determined to be vinegar, water and high fructose corn syrup, at 34%, 22% and 44%, respectively. The quality characteristics of yacon pickles using this solution were monitored during storage at $25^{\circ}C$ for 43 days. The pH value decreased to 2.98 (42 days) during storage and $^{\circ}Brix$ gradually increased during storage. The L-value decreased significantly during storage but there were no significant changes detected in the a and b values. No significant changes were detected in the hardness of the yacon pickles. According to the sensory evaluation, no significant changes in taste, texture and overall acceptance of yacon pickle were observed during storage. These results indicated that yacon was an excellent functional food in terms of its antioxidant activity and that pickling might be a promising methods to maintain the taste and quality of yacon during storage.

• 동아시아식생활학회지
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• 제23권3호
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• pp.374-381
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• 2013

The purpose of this study was to analyze the antioxidant effects and antimicrobial activity of extracts from yacon powder. The total polyphenol contents of yacon powder extracted with methanol was 38.5 mg/g, while extracted with water was 24.0 mg/g. Extractions with methanol were therefore more effective than with water. The total flavonoid contents of yacon powder extracted with methanol was 9.2 mg/g, while that with water was 7.8 mg/g. The electron donating ability of yacon powder extracts, natural antioxidant, and artificial antioxidant at 1.0 mg/mL arranged in order of decreasing concentration were ascorbic acid (98.7%) > BHT (44.7%) > methanol extract (12.1%) > water extract (7.8%). Nitrite-scavenging ability of yacon powder extracted with methanol at pH 1.2 was 13.1%, while that of powder extracted with water at pH 1.2 was 6.8%. And, the hydroxyl radical scavenging activities of yacon powder with methanol at 5 mg/mL was 40.2%. The antimicrobial activity of yacon powder extracted with methanol could be detected on Bacillus cereus ($10,000{\mu}g/disc$) and Staphylococcus aureus ($10,000{\mu}g/disc$).

• 한국식품영양학회지
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• 제23권4호
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• pp.600-606
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• 2010

The objective of this study was to develop functional rice coated with yacon roots extracts and to evaluate the antioxidant properties and physiological activity of rice coated with yacon extract. The washed rice was coated by spraying yacon extract at 10, 20, 30, and $40^{\circ}Brix$ and dried at room temperature. The moisture contents, color changes, antioxidant properties as total polyphenolics and DPPH radical scavenging activity and instrumental texture property and sensory evaluation change in the yacon root extracts coated rice and uncoated cooked rice were observed during 3 days of storage. Increasing the coating concentration was associated with lower color values(L value) and moisture contents. Total phenolics and DPPH radical scavenging properties generally increased in the cooked rice coated with yacon root extract more than the control (non-coated rice). However, D-20($20^{\circ}Brix$ of the yacon root concentration) resulted in better textural properties and sensory overall acceptability in cooked rice on 0 and 3 storage days. It was concluded that the optimum coating ration of rice and added functional yacon rice were $20^{\circ}Brix$ and 7% respectively, in proportion to the total weight of raw rice.

• 한국식생활문화학회지
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• 제28권1호
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• pp.107-113
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• 2013

Yacon (Smallanthussonchifolius) is a root crop that contains high amounts of fructo-oligosaccharides (FOS). FOS has a sweet taste, is low in calories, and is known to promote intestinal tract health. In this study, various yacon concentrates were substituted for sugar in white pan bread to obtain healthy benefits from the use of FOS. The quality characteristic changes during storage of the white pan breadswith 0, 25, 50, 75 and 100% of added yacon concentrates instead of sugar were investigated. During storage, the water contents and water activities of the breads made with high amounts of yacon concentrates changed less than in those made with only sugar. The hardness and chewiness of the breads made with high amounts of yacon concentrates had lower values than those made with only sugar. Thus, bread made with yacon concentrates might exhibit increased moisture retention and decreased aging velocity. The substitution of yacon concentrates for sugar in pan bread improved the bread quality.

• 한국식품영양과학회지
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• 제41권7호
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• pp.921-926
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• 2012

본 연구는 가공식품으로 활용도가 낮은 야콘을 이용하여 저장성을 높인 절임식품을 제조하는 과정 중 데침의 전처리가 최종 제품의 품질에 미치는 영향을 조사하였다. 야콘의 데침 전처리를 달리하여 된장소스에 절인 야콘의 pH는 전반적으로 절인 기간이 증가할수록 감소하는 경향을 보였으나 14일 이후 급격한 감소를 보인 데치지 않은 야콘에 비해 데친 야콘은 5.3~5.5의 수준을 유지하였다. 총산도 역시 기간이 지날수록 두 시료 모두 증가하는 경향을 보였으나 데친 야콘의 경우 데치지 않은 것보다 증가폭이 적었다. 이는 데침의 전처리가 야콘 절임제품의 산과 관련된 품질에 있어 변질을 제어할 수 있는 유용한 방법으로 생각되었다. 염도와 당도의 경우 데침 전처리를 거친 야콘이 데치지 않은 것에 비해 숙성기간 중 더 높은 값을 보였다. 야콘의 chlorogenic, ferulic, caffeic acid와 같은 항산화 능력이 있는 폴리페놀계 물질의 함량을 측정하기 위해 유기용매로 추출하여 분석한 결과 데친 야콘은 숙성기간이 경과하여도 유의적인 변화를 보이지 않았다. 이 결과는 데침의 전처리가 야콘 절임제품 가공 시 항산화력과 관련 깊은 폴리페놀 함량의 유지에 효과적인 것으로 판단되며 구체적인 기작과 최적조건의 설정을 위해서 추가적인 연구가 필요할 것으로 보인다. 된장소스에서 숙성기간에 따른 야콘의 조직감 측정을 위한 hardness는 데침 전처리와 관계없이 모두 21일째 가장 높은 값을 보였으며 이후 감소하는 경향을 보였다. 관능검사는 모든 평가항목에서 두 시료간의 유의적인 차이를 보이지 않아 데침의 열처리가 관능적 품질에 영향을 미치지 않는 것으로 생각된다. 위의 결과를 토대로 항산화 활성을 갖는 야콘의 데침 전처리는 된장소스에 절임 중 폴리페놀 함량과 품질을 유지할 수 있는 효과적인 가공법으로 이용될 수 있을 것으로 생각된다.

• 한국조리학회지
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• 제20권3호
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• pp.100-112
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• 2014

야콘을 첨가한 쿠키를 제조하여 특성을 조사하였다. 야콘 가루 첨가 쿠키는 밀도간에 영향을 미치지 않았으며 pH는 야콘 가루 첨가량이 증가할수록 감소하였다 야콘 가루 12% 첨가군이 가장 높은 수분함량을 보였다. 대조군보다 야콘 가루 첨가군의 퍼짐성이 더 높았으며 손실률과 팽창률은 대조군이 높았으며 전반적으로 야콘 가루를 첨가할수록 퍼짐성은 증가하고 손실률과 팽창률은 감소하는 경향을 보였다. 야콘 가루를 첨가할수록 쿠키의 색도는 명도 L값과 황색도 b값은 낮아지고 적색도 a값은 증가하는 경향을 보였다. 야콘 가루 3%와 6% 첨가군은 대조군과 유의적인 차이가 없었으나 야콘 가루 9%와 12% 첨가군은 대조군보다 낮은 경도 값을 보였다. 이는 야콘 가루를 첨가할수록 수분함량이 높았으므로 수분함량 차이로 인해 경도가 낮아진 것으로 사료된다. 야콘 가루 첨가 쿠키의 DPPH 라디칼 소거능에 대한 결과는 야콘 가루 첨가량이 많을수록 DPPH 라디칼 소거능이 증가하여 12% 첨가군이 가장 높았다. 외관의 기호도는 대조군과 야콘 가루 3%, 6% 첨가군을 선호하였으며 야콘 6% 첨가군이 가장 높은 기호도를 보여 시료간의 유의적인 차이가 있었다. 맛의 기호도는 야콘 가루 6% 첨가군, 3% 첨가군 순으로 높게 나타났으며, 전반적인 기호도에서 6% 첨가군이 높은 기호도를 보였다. 이상의 결과에서 가루에 야콘 분말을 첨가하면 쿠키의 물성이나 기호도 등에서 좋은 영향을 주는 것으로 나타나 항산화성과 관능적 평가에서 6% 정도 첨가하는 것이 가장 좋을 것으로 사료 된다. 이와 같이 본 실험을 통하여 야콘 쿠키의 건강 기능성 측면을 고려한 상품으로서의 소비자의 만족도와 제품개발 가능성을 확인 하였다.