• Journal of the Korean Society of Food Science and Nutrition
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• v.30 no.3
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• pp.466-470
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• 2001

Response surface methodology was used for monitoring extraction conditions, based on quality properties of old pumpkin extracts. Hunter's color L value of extracts was maximized at 101℃, 2.6 hr and decreased gradually after maximum point. The polynomial equation for Hunter's color L value showed 10% of significance level and 0.8799 of R². Hunter's color a value was minimized at 117℃, 3.9 hr and R² of polynomial equation was 0.9852 within 1% significance level. Hunter's color b value and ΔE value increased as the extracting temperature and time increased. Extraction yield of old pumpkin was maximized at 110℃, 4 hr and increased in proportional to the extracting temperature and time, but decreased after 113℃ and 2 hr. Viscosity of pumpkin extracts were maximized at 120℃, nearly 3 hr. R² of polynomial equations for yield, viscosity and sugar content were 0.9532, 0.9812 and 0.8869, respectively. Optimum ranges of extraction conditions for quality properties of old pumpkin were 102∼109℃, 2.5∼3.5 hr, respectively. Predicted values at the optimum extraction condition agreed with experimental values.

• Korean Journal of Food Preservation
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• v.20 no.4
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• pp.532-538
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• 2013

This study was done in order to monitor the quality properties of the granule using Bokbunja (Rubus coreanus Miquel) extracts. In order to prepare the granule depending on operational parameters such as content of Bokbunja extract ($X_1$, 0.4~1.2 g), sugar content ($X_2$, 6~10 g) and citric acid content ($X_3$, 0.1~0.3 g), a response surface methodology was applied to monitor the optimum recipes on the organoleptic properties and Hunter's color. The optimum recipe on the organoleptic color showed extract content of 0.96 g, sugar content of 7.05 g and citric acid content of 0.232 g. The optimum recipe on the organoleptic flavor showed extract content of 0.86 g, sugar content of 6.04 g and citric acid content of 0.215 g. The optimum recipe on the organoleptic taste showed extract content of 0.92 g, sugar content of 6.39 g and citric acid content of 0.251 g. The optimum recipe on the overall palatability showed extract content of 0.86 g, sugar content of 6.65 g and citric acid content of 0.272 g. The response surface of the Hunter's color b value was similar to the response of the overall palatability; therefore, the optimum conditions accepted by the consumers were 0.8 g Bokbunja extract content and 0.6 g sugar content in the Hunter's color a value of 6.0.

• Korean Journal of Food Science and Technology
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• v.31 no.4
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• pp.938-944
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• 1999

Response surface methodology (RSM) was used for monitoring the changes of Hunter's color and organoleptic colors of roasted doraji tea with variations in threonine concentration of soaking solution and roasting condition. In soaking and roasting processes based on the central composite design with variations in threonine concentration of soaking solution, roasting temperature and roasting time, coefficients of determinations $(R^{2})$ of the models were above 0.87 (p<0.05) in Hunter's color parameters and organoleptic color. Hunter's color L value of roasted doragi tea was maximized in 0.09% threonine concentration of soaking solution, $142.37^{\circ}C$ and 21.94 min in roasting condition. Hunter's color a value of roasted doragi tea was maximized in 1.24% threonine concentration of soaking solution, $154.01^{\circ}C$ and 28.59 min in roasting condition, minimized in 1.67% threonine concentration of soaking solution, $137.61^{\circ}C$ and 24.62 min in roasting condition, Hunter's color b value of roasted doragi tea was maximized in 1.10% threonine concentration of soaking solution, $154.72^{\circ}C$ and 27.12 min in roasting condition. The maximum quality of organoleptic color of roasted doragi tea was soaked in 1.25% threonine concentration, and roasted at $141.81^{\circ}C$ for 34.14 min.

• Korean journal of food and cookery science
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• v.2 no.1
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• pp.45-53
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• 1986

This study was conducted to investigate the effects of the properties of sugar (20％, 30%) and starch (l5％, 20%, 25％) to Angdo on Angdo Pyun's preference, texture and color_ Textural characteristics were examined through sensory evaluation, Rheometer. Color test by Color and color difference meter. The properties through sensory evaluation were appearance, color, flavor, hardness, thickness and acceptability. With Rheometer, compression force, work ratio, adhesive work and gumminess were measured. With Color and Color difference meter, L, a ana b were measured. The results were as follows: 1. Sensory evaluation indicated that with the increase of starch addition, the Angdo Pyun maintained a worse apperance and got hardened and thickened. As the amount of suger increased, the Angdo fyun maintained better in color and flavor as well as its acceptability. 2. Rheometer measurement indicated that a compression force, work ratio, adhesive work and gumminess tended to increase, as the starch proportion increased. As the amount of sugar increased, the Angdo Pyun maintained a greater adhesive work, work ratio and gumminess. 3. Color and Color difference meter indicated that figure L ana a tended to increase and b, ΔE and ΔC decrease, as the starch proportion increased. 4. In the analysis of correlation between hardness and compression force, it was found that they are highly related. In view of the above results, it came to the conclusion that Angdo Pyun with the addition of 30％ sugar and 15％ starch could give the best result among the groups studied.

• Journal of the East Asian Society of Dietary Life
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• v.12 no.1
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• pp.55-64
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• 2002

This study was carried out to investigate quality characteristics of Seolgiddeok containing 0, 1, 3, 5 and 7% of Lentinus edodes powder during storage. The water content of Seolgiddeok changed little with the length of storage and the amount of Lentinus edodes powder added. Hunter′s color L value of Seolgiddeok decreased and "a"and "b"value were increased significantly by increasing the amount of Lentinus edodes powder. The hardness, gumminess, adhesiveness, chewiness and cohesiveness of Seolgiddeok decreased, but springiness increased by increasing the amount of Lentinus edodes powder. Seolgiddeok added with 3% Lentinus erodes earned the highest scores in color, taste, softness, chewiness, moistness and overall preference. From the above results of sensory and texture analyses, an addition of 3% Lentinus edodes to Seolgiddeok showed the best result in quality.

• Korean Journal of Food Preservation
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• v.16 no.6
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• pp.884-892
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• 2009

We determined the chemical changes occurring in oil after exposure to high temperatures for various periods of time. Alterations in the chemical parameters of oil after heating for 30, 60, 90, and 120 min at 120C were investigated. The study involved cold-pressed perilla oil (CPPO), virgin perilla oil (VPO), and commercial heat press-extracted perilla oil (CHPEPO), and we assessed quality properties such as Hunter's color values, browning color intensity, acid value, conjugated dienoic acid level, peroxide value, total phenolic content, electron-donating ability, and fatty acid concentration. Hunter L values were higher for CPPO than for VPO or CHPEPO, whereas browning color intensity was greatest for CHPEPO. Peroxide value data showed higher levels of oxidation products in CPPO than in VPO or CHPEPO, whereas conjugated dienoic acid level was most increased in CHPEPO. The content of total phenolics and electron-donating ability were higher in CHPEPO than in CPPO or VPO. After thermal treatment, fatty acid content was most altered in CPPO; in particular, the level of polyunsaturated fatty acids dropped significantly. Hunter L value, acid value, conjugated dienoic acid level, and peroxide concentration also increased whereas Hunter a and b values, browning color intensity, and total phenolic content were decreased in perilla seed oils after thermal oxidation treatment.

• Journal of the Korean Society of Food Science and Nutrition
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• v.11 no.1
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• pp.25-30
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• 1982

To evaluate the quality of commercial dehydrated tea-products, the relationships between particle sizes, densities, moisture absorption & desorption and color appearance were studied by using Hunter-lab tristimulus colorimeter and spectrophotometer. Among the tea-products was held no significant relation between particle sizes and color appearance but red ginseng extract powder (RGEP) was included L, a and b values when was reduced particle size. appearance color of tea-products indicated red-orange color, L, a and b values were ranged 32.7 to 48.0, 4.0 to 10.0 and 5.6 to 18.0, respectively, densities of tea-products ranged 0.232 to 0.898 g/ml and increased L values, Hunter's a/b ratio values was included in 0.61 to 0.90. Color stability in this products was well agreed with decrease of total color difference value ($\Delta$E) and chromaticity difference value ($\Delta$C) of the Hunter-lab color data.

• The Korean Journal of Food And Nutrition
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• v.22 no.1
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• pp.63-68
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• 2009

Powders prepared from three different varieties Korean Ginsengs(white, red and black) are readily available ingredients and are consumed daily by many Korean as a functional food material. These variants of Ginsengs are known to exert a variety of physiological effects. Therefore, in this study, we assessed the physiochemical characteristics of Korean Ginseng Dasik prepared with different 3 types of Ginseng powder. We conducted a sensory evaluation analysis, and assessed the mechanical characteristics, Hunter's color values, and general compositions of 3 types of Korean Ginseng Dasik stored at room temperature(20$^{\circ}C$). The results of our sensory evaluation showed that there were significant differences in the color, taste and overall quality of the samples(p<0.05), but there were no significant differences in odor or texture. With regard to the mechanical properties of the samples, we noted significant differences in he Hardness, Cohesiveness, Gumminess and Chewiness of the samples(p<0.05), but no differences in springiness were detected. The luminance of the black Ginseng Dasik was significantly less than that of the red, white, and control samples(p<0.05), We noted significant differences in Hunter's b values, but no significant differences in Hunter's a values among the samples were detected. No significant differences in the general compositions of the samples were noted. In conclusion, red Ginseng Dasik among the samples evaluated herein, has the most commercial value.

• Korean journal of food and cookery science
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• v.8 no.3
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• pp.225-231
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• 1992

This investigation was undertaken for the purpose of studying me quality, acceptibility and storage of soybean rice cake containing various levels of soybean. Soybean rice cake was stored at 30$^{\circ}C$, room temperature (18~20$^{\circ}C$) and 5~6$^{\circ}C$. Sensory evaluation was done by panels of 7 judges. Objective measurements were made by utilizing me Instron and Hunter Colormeter. The results were as following; 1. By sensory evaluation, 30% soybean of soybean rice cake was better than others during storage periods. 2. By Instron measurement of soybean rice cake, Hardness was tend to increase as addition level of soybean decreased and as storage periods increased. Hardness had significant relationship with consistency, moistness and texture during storage at 5~6$^{\circ}C$. 3. By color value of soybean rice cake, b value was tend to increase as me addition level of soybean increased and decrease as storage periods increased. The Hunter of L,a,b showed mat color of sensory evluation had significant relationship with only b value.

• Korean Journal of Human Ecology
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• v.20 no.6
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• pp.1229-1237
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• 2011

The objective of this study was to evaluate the quality characteristics of Cheongpomook prepared with five different levels of mungbean powder (0, 25, 50, 75, and 100%). We conducted the Hunter's color values, the rheological characteristics, sensory evaluations, and pasting properties of the Cheongpomook samples. The more mungbean powder was added, the more the luminance and Hunter's a values of Cheongpomook samples were decreased, but in Hunter's a values was reverse. With regard to the rheological properties of the Cheongpomook samples, the more mungbean powder was added, the values of hardness, springiness, gumminess, and chewiness were significantly decreased. In color, taste, and overall quality, the value of 25% mungbean powder added Cheongpomook (MP1) and 50% added Cheongpomook (MP2) were significantly higher than those of others. The resulting RVA viscogram, peak viscosity, hold viscosity, break down, setback, and final viscosity of Cheongpomook were decreased with an increase in mungbean powder, but the pasting temperature was increased slightly. Therefore, an addition of 25% mungbean powder appears to be an acceptable approach to enhance the quality of Cheongpomook without reducing acceptability.