• 대한영양사협회학술지
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• 제16권4호
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• pp.341-352
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• 2010

The aim of this study was to use purple sweet potato powder to develop a recipe for a nutritional cookie with an optimal composition of ingredients and texture, in order to acquire strong preference responses by all age groups in sensory tests. Wheat flour was partially substituted with purple sweet potato powder to reduce the wheat flour content of the cookies. Measurements were made and analyzed according to the Response Surface Methodology technique, which showed 16 experimental points including 3 replicates for the purple sweet potato powder, sugar, and butter. The compositional and functional properties of the sample were measured, and the values obtained were applied to a mathematical model. A canonical form and perturbation plot showed the influence of each ingredient on the final product mixture. The results of sensory evaluations showed very significant values for flavor (P<0.0071), texture (P<0.0306), taste (P<0.0190), and overall quality (P<0.0142). Instrumental analysis showed significant values for hardness (P<0.0027), yellowness (P<0.0061) and spread ratio (P<0.0001). The optimal compositional ratios were determined to be 21.75 g for the purple sweet potato powder, 37.05 g for the sugar, and 60.59 g for the butter.

• 한국식품과학회지
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• 제44권1호
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• pp.28-33
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• 2012

자색 고구마 뻥튀기의 실험결과는 색도 중 $L^*$ 값이 팽화시간이 증가할수록 $L^*$값이 감소하는 유의적인 차이를 나타내었으나 수분함량이나 팽화온도에 따른 차이는 나타내지 않았다. $a^*$값은 팽화시간, 팽화온도가 증가함에 따라 함께 증가하는 유의적 차이를 나타냈으며, $b^*$값은 몇몇 시험구에서 팽화시간과 팽화온도가 증가할수록 $b^*$값도 증가하였다. 비체적은 수분함량과 팽화온도가 높아질수록 증가하였고, 수분함량 11%, 팽화온도 $246^{\circ}C$, 팽화시간 4초에서 제조한 시험구가 가장 높은 값을 나타내었다. 또한 자색 고구마 뻥튀기의 파괴력은 팽화온도와 팽화시간이 증가함에 따라 함께 증가하며 수분함량이 낮을수록 높은 파괴력을 나타내는 유의적인 차이를 보였다. 관능평가에서 7% 수분함량, 팽화온도 $246^{\circ}C$, 팽화시간 5초에서 제조한 뻥튀기가 패널들에게 높은 점수를 얻었다.

• 한국식생활문화학회지
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• 제32권4호
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• pp.323-331
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• 2017

This study examined the quality characteristics of Jeung-pyeon made with wet non-glutinous rice flour and rice wine. The samples of Jeung-pyeon were prepared with different ratios of cooked purple sweet potato (0, 3, 6, 9, and 12%) to analyze the water content, sugar content, pH, chromaticity, texture characteristics, and sensory evaluation. No significant difference in water content, sugar content, and springiness was observed among the 5 samples. The pH and volume showed the highest level at 0%. The L-value and b-value decreased while the a-value increased. The hardness, chewiness, and gumminess were highest at 9% and lowest at 12%. The extent of violet chromaticity and pore size were optimal in 9%. In addition, 9%-added purple sweet potato showed the highest score of odor, taste, texture, and overall acceptability. In conclusion, the optimal addition for the highest acceptability of cooked purple sweet potato was 9%.

• 한국식품영양과학회지
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• 제39권10호
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• pp.1476-1480
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• 2010

육질색에 따른 일반고구마, 주황색고구마 및 자색고구마로부터 갈변방지제 처리와 건조방법을 달리하여 분말을 제조한 후 고구마 분말의 이화학적 특성을 분석하였다. 고구마 분말의 조단백질, 회분 및 식이섬유 함량은 자색고구마에서 가장 높았고 조지방과 전분 함량은 주황색고구마에서 가장 높게 나타났다. 고구마 분말의 평균 입자크기는 주황색고구마 분말에서 가장 크게 나타났으며 각각의 고구마 분말에서 둥근형 또는 다각형의 전분입자 형태를 관찰할 수 있었다. 고구마 분말의 수분흡수지수 및 oil 흡수율은 열풍건조방법으로 제조한 분말이 동결건조에 의한 분말보다 높은 경향을 주었다. 고구마 분말의 수분용해도지수는 일반고구마와 자색고구마의 경우 건조조건에 따른 차이가 크지 않은 반면, 주황색고구마의 경우 열풍건조 한 분말에서 수분용해도지수가 높게 나타났다.

• 한국식품저장유통학회지
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• 제19권6호
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• pp.833-840
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• 2012

다양한 생리기능을 지닌 자색고구마를 이용한 머핀에 쌀가루 첨가량을 달리하여 고품질의 자색고구마 쌀머핀을 제조한 후 품질특성 및 관능적 기호도를 조사한 결과는 다음과 같다. 머핀의 무게와 높이는 쌀가루를 첨가 할수록 높이가 높아지는 경향을 보였으며 수분함량은 낮게 나타났다. 쌀가루의 첨가량이 많아질수록 pH는 높아졌으며 반면 산도는 낮아지는 경향을 보였다. 쌀가루 첨가 자색고구마 머핀에서 색도는 쌀가루 첨가량이 증가할수록 명도(L)와 황색도(b)는 감소하였고 적색도(a)는 증가하였다. 경도는 P0(대조군)에서 가장 낮게 나타났으며 쌀가루 첨가량이 증가할수록 높게 나타났고 탄력성은 P4(100% 첨가군)가 가장 높았다. 응집성, 씹힘성과 부서짐성은 쌀가루 첨가량이 증가할수록 낮음을 알 수 있었다. 쌀가루 첨가 자색고구마 머핀의 항산화활성은 55.07~58.34로 나타났으며 P0(대조군)에 비해 P3(75% 첨가군)와 P4(100% 첨가군)가 유의적으로 높게 나타났다(p<0.001). 쌀가루 첨가 자색고구마 머핀 관능검사 결과 외부색에서는 P2(50% 첨가군)에서 내부색은 P0(대조군)와 P1(25% 첨가군)이 높았으며 향미에서는 시료 간 유의한 차이를 보이지 않았다. 질감 중 촉촉한 정도는 P0(대조군)이 가장 높게 나타났으며 P2(50% 첨가군), P4(100% 첨가군)에서 다소 낮게 나타났다. 씹힘성에서는 P0(대조군), P1(25% 첨가군) 보다 P2(50% 첨가군), P3(75% 첨가군), P4(100% 첨가군)가 더 높게 나타났다. 전반적인 기호도에서는 쌀가루 첨가량이 증가할수록 P3(75% 첨가군), P2(50% 첨가군), P4(100% 첨가군), P1(25% 첨가군)순으로 기호도가 높게 평가되었으며 대조군에 비해 P2(50% 첨가군)와 P3(75% 첨가군)이 유의적으로 높은 값을 보여(p<.05) 쌀가루 첨가 자색고구마 머핀 제조시 쌀가루 첨가량을 밀가루 대비 쌀가루 첨가 50~75%를 적정한 비율로 판단되었다.

• 동아시아식생활학회지
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• 제20권2호
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• pp.272-278
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• 2010

Various quality attributes were determined in muffins prepared using purple-colored sweet potato flour. Height of control muffins was 5.8 cm lease clarify. Height decreased with increasing quantity of sweet potato powder. Muffin volume was not appreciably affected. Moisture of control muffins was 21.84. The moisture value decreased with increasing quantity of sweet potato powder. Scanning electron microscopy examination revealed thick cell wall and rough stoma in muffins prepared with purple-colored sweet potato powder. The amount of gluten decreased as the quantity of purple-colored sweet potato powder increased. Brightness L values significantly changed as the amount of powder increased, indicative of a progressively darker product. Red index a values decreased as the quantity of purple-colored sweet potato powder increased. Yellow index b values decreased significantly in the control group as powder quantity increased. Hardness increased with increasing addition of powder, but no significant difference was evident between 6% and 9% amended samples. There were also no significant differences in springing in samples containing 3% and 6% powder but 9% powder produced a significant difference. Cohesiveness did not differ in unamended samples and samples amended with 3% and 9% powder, however a significant difference was evident in samples prepared with 6% powder. Gumminess and chewiness increased as the quantity of purple-colored sweet potato powder increased. Color did not differ appreciably in sample prepared with 3% and 9% Sample prepared with 3% additives showed the highest What? Color score? Something else? Please clarify with 6.4. There was no significant difference of the flavor in samples prepared with 3% and 6% powder, or in taste among samples prepared 3%, 6%, and 9% powder. No significant differences in texture were evident in any sample Overall acceptability was highest (7.2) in samples prepared with 3% of purple-colored sweet potato.

• Food Science and Biotechnology
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• 제18권6호
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• pp.1487-1494
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• 2009

The effects of drying temperature (55, 60, and $65^{\circ}C$) and addition levels of maltodextrin (MD) (10, 20, and 30%) on the physicochemical properties and nutritional quality of purple sweet potato flour were investigated. MD-added flours had higher $L^*$ values, water soluble index, total phenolic, and anthocyanin contents than untreated flour. However, $a^*$, $b^*$ values, water absorption index, and swelling capacity were dependent on the drying temperature and MD concentration. On the other hand, untreated flour had a higher ascorbic acid content compared to the MD-treated flour. Ascorbic acid contents decreased, whereas anthocyanin content was not significantly different, with increasing drying temperatures. MD was positively correlated with phenolic content, anthocyanin, hue angle, and water soluble index. However, there was no correlation between quality parameters and glass transition temperature. The best quality product was obtained when samples were pretreated with MD before drying, regardless of drying temperature.

• Preventive Nutrition and Food Science
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• 제14권1호
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• pp.60-65
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• 2009

Cookies were prepared by adding different levels (0, 5, 10, 15, and 20%) of purple sweet potato powder (PSPP) and their physicochemical and sensory characteristics were examined. With increase of the PSPP level, moisture content decreased and ash content increased (p<0.05). The spread factor of control cookies was higher than that of cookies containing PSPP. The incorporation of PSPP in cookies lowered the lightness and yellowness but increased redness (p<0.05). Texture measurement showed that the addition of PSPP did not affect the hardness of cookies. Results of acceptance test revealed that overall acceptability score was not significantly different between the control and the PSPP added cookies. Therefore, it is suggested that PSPP can be incorporated into cookies up to 20% without affecting the cookie quality. Total polyphenol content and antioxidant activity were assessed to examine the functionality of cookies. In addition, substitution of wheat flour with PSPP yielded cookies with higher polyphenol content and antioxidative activity (p<0.05). The peroxide value (POV) and acid value increased during storage at $60^{\circ}C$ for 80 days. The POV was significantly lower in cookies containing PSPP than the control cookies, suggesting that the addition of PSPP deterred the lipid oxidation (p<0.05).

• 한국식품조리과학회지
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• 제13권4호
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• pp.492-499
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• 1997

밀가루(80%)와 자색고구마가루(20%)를 이용한 복합분으로 고구마빵을 제조하기 위하여 L-ascorbic acid, potassium bromate, gluten, carboxy methyl cellulose 및 hydroxy propyl methyl cellulose 등의 물성개량제를 첨가하여 고구마빵의 제빵성을 비교.검토하였다. Alveograph에 의한 반죽특성은 물성개량제를 첨가함에 따라 P, L, W값이 증가하였으며, 특히 L-ascorbic acid, gluten, carboxy methyl cellulose 등의 영향이 컸다. 반죽의 표면구조는 산화제를 첨가한 경우 gluten의 얇은 막이 거의 관찰되지 않았고, gluten, carboxy methyl cellulose, hydroxy propyl methyl cellulose를 참가한 경우 전분입자의 형태는 비교적 선명하나 큰 전분입자를 중심으로 얇은 막으로 둘러싸여 있었다. 빵 내부색의 총체적인 차이를 구별할 수 있는 ΔE값은 첨가제에 의한 영향은 없었으며, 빵 내부의 물성은 최대하중치, 강도, 경도 특성치가 사용첨가제에 의해 감소하였으며, 탄성, 응집성의 특성치는 증가하였다. 빵 내부의 노화특성은 7일 냉장저장 결과 엔탈피($\Delta$H)값이 증가하였으나 각 첨가제 모두 노화지연 효과가 있었다. 빵의 부피도 첨가제를 사용함으로써 증가하였으며 특히 L-ascorbic acid, L-cystine, carboxy methyl cellulose 및 hydroxy propyl methyl cellulose 등의 효과가 좋았고, 관능검사결과 potassium bromate를 제외하고 전반적으로 제빵의 품질이 양호하였다.