• Journal of the Korean Society of Food Culture
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• v.13 no.1
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• pp.9-17
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• 1998

The objective of this study is to provide a fundamental data to improve meals of the college foodservice operations serving more than 300 meals per day through evaluating changes in; total vitamin C contests, water contents, and pH, in the process of handling such foods as soybean sprout cooked and of fresh vegetable salads. This study, also, tried to identify nutrition reduction, step by step, to minimize nutrition loss. 1. In handing COOKED SOYBEAN SPROUTS, total vitamin C contents were higher after wash(1.54%mg%) than other cooking methods adopted in university meals(1.08mg%), however, total vitamin C contents was significantly lost during boiling step. 2. Significant loss of total vitamin C and water content in the FRESH VEGITABLE SALADS was detected in the process of washing and cutting vegitables. Especially,'cabbage' lost 20% of total vitamin C in the process of 'soaking in water', which was one of preparation process 3. Significant loss of vitamin C was observed after 6 hours of HOLDINC AFTER COOKING but it can be reduced through holding under lower temparature, in case of soybean sprouts and fresh vegitable salads. pH became acidic as holding time expanded. WATER CONTENT of cooked soybean sprouts decreased up to 4 hours holding time, however, it increased when we checked at after 6 hours' of holding time. Water content continuously decreased up to 6 hours of holding time in case of FRESH VESITABLE SALADS with the statistically significance level.

• Korean journal of food and cookery science
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• v.29 no.6
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• pp.785-794
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• 2013

To satisfy the consumer's interest with safety and high quality of staple foods, the physicochemical properties and cooking quality of organic rice using hairy vetch in Korea were compared. Two Korean varieties, Hopyeong and Ilmi, two Japanese varieties, Koshihikari and Hedomebore, and newly developed in Jeonnam, Mipum which cultivated in the same region and conditions were used. Physicochemical properties and cooking quality were investigated. All samples were japonica type short grains and their length/width ranged 1.74-1.84. The protein, ash, and crude lipid contents were significantly different with varieties and the protein content of Korean rice was lower than that of Japanese rice, especially, that of Hopyeong was the lowest. Amylose content and initial pasting temperature were lower in Hopyeong and Japanese rice, but peak viscosities showed reverse trends. Swelling power at $80^{\circ}C$ showed higher in Hopyeong and Koshihikari. Color values, L, a and b were significant difference with varieties and color differences of Hopyeong and Huitomebore were lower than those of others. Texture properties, hardness and adhesiveness of Hopyeong cooked rice showed the lowest values, but adhesiveness of Japanese cooked rice exhibited the highest value. On sensory evaluation of cooked rice, glossiness of Koshihikari, intactness of Koshihikari, Huitomebore, and Hopyeong, stickiness of Koshihikari and Hopyeong showed higher values (p<0.05). The overall quality score of organic cooked rices decreased as following order; Koshihikari> Hopyeong> Huitomebore> Mipum> Ilmi.

• Korean journal of food and cookery science
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• v.32 no.2
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• pp.197-203
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• 2016

Purpose: In this study, small black beans (Rhynchosia nulubilis) that were produced in the Jungsun province of South Korea were selected for use in various cooking recipes because they are known to contain higher isoflavones and excellent antioxidant effects, as compared to any other domestic soybeans. Methods: Physicochemical and antioxidant characteristics of small black beans were analyzed with uncooked beans and four other cooking methods of pan broiling, boiling, steaming, and pressure cooking. Results: Contents of ${\beta}$-glucosides (daidzin, glycitin, and genistin) and aglycone (daidzein, glycitein, and genistein) in small black beans were significantly different depending on the cooking methods (p<0.001). The results of the experiment indicated that the amount of total polyphenol in pressure cooked beans was highest, showing a value of 7.16 mg/g (p<0.001). Most contents of isoflavones (${\beta}$-glucoside, aglycone) in uncooked beans appeared to increase after cooking. In particular, the amount of glycitein was highest in pan broiled beans ($9.63{\mu}g/g$). The total isoflavone content differed among the different cooking methods, ranging from highest to lowest in the following order : pan broiled beans ($759.49{\mu}g/g$), pressure cooked beans ($725.12{\mu}g/g$), boiled beans ($591.05{\mu}g/g$), steamed beans ($511.61{\mu}g/g$), and uncooked beans ($180.80{\mu}g/g$) (p<0.001). Conclusion: Especially, the amount of isoflavones increased significantly in pan broiled beans and pressure cooked beans, suggestive of optimized cooking methods for increasing nutritional and functional contents in cooked food.

• Applied Biological Chemistry
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• v.29 no.4
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• pp.372-374
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• 1986

Changes in moisture content and degrees of gelatinization during cooking of sweet potatoes by different cooking methods were studied. The samples were cooked by boiling, steaming, gas oven or microwave oven baking. Changes in the moisture content of sweet potato during cooking were +30.0% by boiling, +4.4% by steaming, -5.8% by gas oven baking, and -46.6% by microwave oven baking. The degrees of gelatinization of sweet potatoes were 83.8%, 75.7%, 73.0% and 67.7%, respectively.

• Journal of the Korean Society of Food Science and Nutrition
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• v.36 no.7
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• pp.908-914
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• 2007

Sasa borealis (bamboo) is a perennial medicinal plant and its leaves are utilized widely in Korea. In this study, effects of bamboo leaves (Sasa borealis) extract on the physical, textural, and sensory characteristics of cooked rice were examined. Four kinds of cooked rice were prepared with 0.0% (control), 0.2%, 0.3% or 0.4% of the extract (w/w). Moisture content of the cooked rice decreased with increasing amounts of extract. Color of the cooked rice was darkened gradually with increasing amounts of extract and appeared yellowish-brown. Among the four textural properties, only hardness increased significantly by the addition of the extract. Sensory evaluation was significantly different in terms of unique rice flavor, bamboo flavor, color, unique rice taste, bamboo taste, viscosity, hardness, adhesiveness, and coarseness among the control group and the group with 0.2%, 0.3%, and 0.4% of the extract; however, overall acceptancy was not significantly different among the four groups. In conclusion, concerning overall sensory evaluation, cooked rice with 0.2% bamboo leaves (Sasa borealis) extract showed the best result.

• Proceedings of the Korean Society of Postharvest Science and Technology of Agricultural Products Conference
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• 2002.08a
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• pp.109-119
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• 2002

Rice production in Korea began to rise significantly after 1970. Rice is the dominant food in Korea and most of the rice production (about 95%) is consumed as cooked rice. it provides over 4,000Kj of energy per capita per day. Apparent rice availability in 2000, 93.6Kg of milled rice per person annually. The non-allergenic character of rice offers a sound basis for development of products for markets for all age groups. Whole grains are washed rice, coated rice, enriched rice in Korea. Utilization of rice as food can be categorized three categories in Korea; direct food use, processed foods, and brewing. Rice for direct consumption include regular whole grain, precooked rice, brown rice and specialty products such as aseptic cooked rice, retort cooked rice and rice burger. Rice used for processed foods includes that for cereal, soup, baby food, snack, cake, noodle, brown rice tea, and minor unclassified uses. Rice use for brewing is for the production of fermented rice wine. The use of rice for direct food is by for the greatest of the three uses. Although direct food accounts for the largest domestic consumption, a significant quantity of rice is used in processed products. The use of rice by-products as human food should not be over looked. Utilization of by products(rice germ, rice bran) requires a specialized technology. Typical type of rice is black rice. When cooked, black rice gives a black color to cooked rice. Glutinous rice performs specific functions in several commercial products such as dessert, gravis, cake and snack. Rice starch production is quite limited because of the high cost of making of starch. Rice processed products in Korea are occupied small parts of total rice production compared to Japan. Rice cake (Garadog) is the principal from of rice product consumed in Korea. Rice cake and snack is usually prepared from non-glutinous milled by washing, grinding, steaming, cooling and packaging. Rice cake will be continued to be a major rice product in Korea. Rice products represent a means to study variety differences in rice grain quality, since the processing magnifies differences not normally detected from more boiling. Recently, rice processing companies in Korea are about 400 ones which uses rice about 160,000tons. New rice processed products and modified traditional products must be developed and diversified with high quality and processing properties of rice processed products are improved.

• Journal of the Korean Home Economics Association
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• v.33 no.4
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• pp.89-106
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• 1995

The purpose of this study was to investigate food habits and food preference of 108 male and 123 female college students through questionnaires. The results were summarized as follows ; 1. Average height of male and female students were 171.8cm, 160.2cm and the average body weight of those were 64.4kg, 51.4kg, respectively. 2. Average PIBW of male and female students were 99.8, 95.3 and average BMI were 21.8, 20.1, respectively. 3. 25 percent of male and 17.1% of female subjects skipped breakfast almost everyday. 4. BMI of those who likes sweet taste was higher than other groups. 5. korean food was favored by college students and the preference of korean food was higher in male than female. 6. In staple foods, cooked rice was preferred most by the subjects, male liked cooked rice more than female. in side-dishes, Pork and beef dish were preferred most in male and Kimchi stew was preferred most in female. in snacks, fruits and bread were preferred most by the subjects.

• Food Industry And Nutrition
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• v.16 no.1
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• pp.33-35
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• 2011

• Journal of the Korean Dietetic Association
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• v.17 no.4
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• pp.378-386
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• 2011

To examine the effect of obesity on volume perception according to size and color of rice bowl, we divided female college students into a normal weight group (<30% fat mass, n=100) and obese group (${\geq}30%$ fat mass, n=83) and then measured perceived volume of rice bowls of various sizes (general size; 350 ml vs. small size; 188 ml) and color (yellow, white, blue, and black) containing the same amount of cooked white rice (210 g). Normal weight group perceived that the general rice bowl contained significantly more cooked white rice compared to the small rice bowl. In contrast, the obese group perceived that the general rice bowl contained significantly less cooked white rice than the small rice bowl. The estimated variance in perceived volume of both bowls was significantly bigger in the obese group compared to the normal group. There were no differences in perceived volume among any of the subjects (both normal and obese groups) according to rice bowl color. However, the estimated variance in perceived volume in the obese group was significantly larger than that in the normal group for all of the rice bowls. In conclusion, rice bowl size and color might affect volume perception, and volume perception in obese people may be different from that of normal weight people.

• Korean Journal of Food Science and Technology
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• v.24 no.5
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• pp.511-514
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• 1992

The effects of soaking conditions (time and temperature) of rice on the water absorption behaviors and the consequent textural properties after cooking were investigated. Water absorption during soaking was completed in 30 min at $23^{\circ}C$, while the hydration continued up to 60 min at $4^{\circ}C$. The hardness (H) of the cooked rice decreased, while the stickiness (S) and S/H ratio increased with increased soaking time. Soaking at $23^{\circ}C$ gave higher values of S and S/H of cooked rice than soaking at $4^{\circ}C$. Soaking for $10{\sim}40\;min$ at $4^{\circ}C$ or for $10{\sim}20\;min$ at $23^{\circ}C$ resulted the value of S/H between 0.15 and 0.20, which had been found at acceptable textural parameters of the cooked rice.