• Food Science and Preservation
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• v.20 no.2
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• pp.158-165
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• 2013

This study aimed at investigating the quality changes of Yukwa during storage using the various item packaging methods present in the domestic market. The samples consisted of a self-adhesive-oriented polypropylene (OPP) film pouch (P1), a heat-sealed OPP film pouch (P2), and a polystyrene (PS) tray with a polyethylene terephthalate (PET) lid (P3). These were stored at $25^{\circ}C$ up to eight weeks. Throughout the storage period, the acid values of all the study samples remained under the Korean hygiene regulation limit of 2.0 mg KOH/g. The P2 samples showed both the slowest decrease in water content and the slowest increase in hardness value during storage. Sensory evaluation also showed that the P2 samples were the only ones that maintained their market value of 5.0 throughout the eight-week assessment period.

• 한국약용작물학회:학술대회논문집
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• 2007.05a
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• pp.267-268
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• 2007

• Korean Journal of Food Science and Technology
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• v.39 no.5
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• pp.534-540
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• 2007

In this study, waxy rice starch was chemically modified using phosphorous oxychloride ($POCl_3$, 0.002-0.008%). Then the physicochemical properties of resulting cross-linked waxy rice starches were investigated in order to reduce the steeping time of Yukwa (a Korean oil-puffed rice snack) processing. The swelling powers of the cross-linked waxy rice starch samples were higher than the native waxy rice starch at temperatures above $60^{\circ}C$, and their increases were proportional to the $POCl_3$, concentration. The solubility of the cross-linked waxy rice starch was lower (1.6-3.4%) than the native waxy rice starch (2.7-6.1%). However, the moisture sorption isotherm of the cross-linked waxy rice starch was not significantly different from the native waxy rice starch. The rapid visco analyze. (RVA) pasting temperatures $(65.4-67^{\circ}C)$ of the cross-linked waxy rice starch were lower than those of the native starch $(67^{\circ}C)$. The RVA peak viscosities (287-337 RVU) of the cross-linked waxy rice starch were higher than that of native starch (179 rapid visco units (RVU)), and increased with increasing $POCl_3$ concentration. For the differential scornning calorimeter thermal characteristics, although Tc shifted toward higher temperatures with cross-linking, the To, Tp, and amylopectiin melting enthalpy of the cross-linked waxy rice starch showed no differences compared to the native waxy rice starch. The X-ray diffraction patterns of both the native and cross-linked waxy rice starches showed typical A-type crystal patterns, suggesting that cross-linking mainly occurs in the amorphous regions of starch granules. Therefore, the cross-linking reaction did not change the crystalline region, but altered the amorphous region of the waxy rice starch molecules, resulting in changes of solubility and RVA pasting properties in the cross-linked waxy rice starch. In summary, since cross-linked waxy rice starch has a high puffing efficiency and no browning reaction, it may be applicable for Yukwa processing without a long steeping process.

• 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.101.1-101
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• 2003

우리 전통식품인 유과를 미국 현지인에게 수출을 위한 기초자료로 활용하고자 2002년 9월에 시카코, 아틀란타, 뉴욕, 샌프란시스코 지역 미국인 350명을 대상으로 디자인과 포장표시사항을 영어로 인쇄한 유과의 기호도 조사를 실시하였다. 조사대상자의 성별분포는 남자 45.8%, 여자 54.2%, 연령분포는 10대 41.6%, 20대 58.4%, 인종분포는 백인이 76.34%, 흑인은 6.49%, 히스페닉인은 6.97%였다. 유과의 포장상태는 전체 응답자중 82.78%는 만족하였으며 포장디자인은 22.0%가 매우 만족하고 54.4%가 만족하는 것으로 나타났고 인쇄는 69.7%이상이 만족하고 있었다. 그러나 냄새의 경우 47.9%, 조직감은 48.5%로 만족정도가 다른 항목에 비해 낮았지만 맛과 함께 평가된 향미의 항목에서는 만족도가 60.9%로 상승하였음을 알 수 있었으며 유과에 대한 전반전인 기호도는 96.8%로 응답자 대부분의 기호에 맞다고 답하였다. 따라서 외국인들의 기호에 맞는 인쇄, 디자인, 포장을 한다면 우리 나라 전통 한과인 유과의 수출을 확대시킴으로서 우리 전통의 식품의 세계화가 가능할 것으로 판단되었다.

• Korean journal of food and cookery science
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• v.14 no.3
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• pp.225-231
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• 1998

Enzyme-treated glutinous rice flour, which was developed to shorten or skip a steeping process during the preparation of Yukwa, was analyzed for its physicochemical characteristics and compared with glutinous rice flour made by 28-day-steeping method. Total sugar content of the 28-day-steeped flour was the highest among all groups, on the other hand, the reducing sugar content was higher in enzyme-treated glutinous rice flour. The viscosity of enzyme-treated flours was significantly lower than that of the 28-day-steeped and particularly showed the lowest value at 65$^{\circ}C$. The contents of Ca$\^$2+/ and Mg$\^$2+/ in enzyme-treated glutinous rice flours were higher than those of the 28-day-steeped group, however, the content of P$\^$+/ was lower. Free sugar detected in glutinous rice flour prepared from 28-day-steeping method was glucose only, but enzyme-treated flours contained maltose and glucose, and the content of total free sugar was much higher than that of the 28-day-steeped group. In microscopic structure, both 28-day-steeped and enzyme-treated flours showed the particle size decreased and porous surface on some part of the flour granule.

• Korean Journal of Food Science and Technology
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• v.33 no.6
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• pp.737-744
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• 2001

This study was carried to investigate the changes in physical and chemical properties during preparation of Yukwa. Protein content of glutinous rice was decreased during soaking time and acid and pH values were increased while contents of lipid and ash were not changed. Particle size distribution showed thate average particle size of 7 days soaking treatment smaller than those of 3 days and starch damage of glutinous rice flour was increased during soaking time. The major flavor components after soaking were found ethyl ester acetic acid, ethanol, 2-butan -ol, 2-methyl 1-propanol, 1-butanol, 3-methyl 1-butanol and 1-pentanol, propanoic acid. Content of acetic acid and butanoic acid were rapidly increased during soaking time. Results for ratio of storage modulus(G') and loss modulus(G') in glutinous rice flour dough indicated $tan{\delta}$ was increased for a while and decreased as frequency increased. G' value was very similar with G' value after steaming which means rubber-like property while G' and G' value were changed after during storage time. Treatment at $-20^{\circ}C$ had the highest hardness for cutting degree of dough. There was no difference in color value between different water contents. Hardness of Bandegi (sheet) was decreased as water content increased and the highest popping value was obtained at 18% of water contents. Adding 3% soaked bean had higher redness value of Yukwa and lower value in yellowness.

• Journal of the East Asian Society of Dietary Life
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• v.25 no.3
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• pp.387-395
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• 2015

This study analyzed the Importance-Performance Analysis (IPA) of purchase behaviors and attributes for Hangwa. The data for this study were collected over 10 days from April 10 through April 19, 2013. For empirical research, married women over the age of 20 in Gwangju with buying experience of Hangwa were surveyed. A total of 172 questionnaires were completed and statistically analyzed by SPSS 18.0 package. Analysis rate was 96.6%. To review Hangwa purchase behaviors, most respondents bought Hangwa four or five times per year for memorial services or ancestral rites. Respondents bought Hangwa at big supermarkets and the types of Hangwa bought were Yukwa and Yakgwa. Their average expenses were 20,000 to 30,000 won per purchase. Among purchase attributes of Hangwa, respondents considered the importance of 'sanitation' (4.76 points) a top priority, followed by 'origin' (4.75 points), 'quality' (4.74 points), 'taste' (4.57 points) and 'appearance' (3.82 points). However in the case of satisfaction, 'sanitation' (3.85 points) was the most satisfying aspect, followed by 'package' (3.82 points), 'amount' (3.80 points), 'appearance' (3.51 points) and 'taste' (3.41 points). According to the IPA results, 'quality' and 'origin' purchase attributes, should be quickly improved. 'Sanitation' and 'taste' should be maintained. This survey found that satisfaction levels for Hangwa purchase attributes had a significant influence on overall satisfaction (F=29.11, p<.001), and especially 'taste' ($\beta$=.42, t=6.69, p<.001) had a meaningful effect on overall satisfaction. In addition, satisfaction levels for Hangwa purchase attributes affected repurchase intention (F=20.05, p<.001). From these results, Hangwa manufacturers should make efforts in product development to induce customers satisfaction and repurchase intention.

• Journal of the Korean Society of Food Culture
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• v.29 no.3
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• pp.270-277
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• 2014

This study investigated the antioxidant effect of Taraxacumofficinale on the qualitycharacteristics of Yugwa during storage. Total polyphenol content was higher than total flavonoid content. DPPH radical scavenging activity and antioxidative index of Taraxacum officinale ethanol extracts were significantly (p<0.05) lower compared with those of Vit.C, whereas they were similar with those of BHA. The L, a, and b levels of Yugwa significantly (p<0.05) decreased with increasing amount of Taraxacum officinale powder; 6% Taraxacum officinale powder showed the lowest L and b levels. Hardness was unaffected by Taraxacum officinale content during the storage period. Brittleness of Yugwa was significantly (p<0.05) lower in control, 1.5%, and 6% Taraxacum officinale powder, whereas 3% Taraxacum officinale powder showed no significant differences during storage. Peroxide value significantly decreased in 3% and 6% Taraxacum officinale powders compared to those of control and 1.5% Taraxacum officinale powder after 4 weeks of storage. Taste, flavor, and crispness showed significant (p<0.05) differences according to Taraxacum officinale concentration. In conclusion, addition of 3~6% Taraxacum officinale powder provides beneficial effects in terms of storage life of Yugwa without any detrimental effects on quality characteristics.