• 한국식품영양학회지
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• 제30권2호
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• pp.336-344
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• 2017

The physical characteristics of gluten-free rice bread, commercial rice as well as wheat bread marketed in Korea were delineated, a sensory descriptive analysis performed, and a consumer acceptability study conducted. Both the specific gravity and color of gluten-free rice bread were higher than those of commercial rice and wheat bread. The sensory descriptive analysis revealed that the adhesiveness, fracturability, fermentation odor, and the powdery mouthfeel of gluten-free rice bread were higher than those of commercial rice and wheat bread. In contrast, the sweet odor, sweetness, egg taste, butter taste, and milk taste of gluten-free rice bread were lower than those of commercial rice and wheat bread. The consumer acceptability results revealed differences regarding odor, appearance, taste, texture, and overall acceptance between a blind test and an informed test of gluten-free rice bread, commercial rice, and wheat bread. The consumer acceptability findings were associated with those of the sensory descriptive analysis. In overall, the results indicated that the quality of gluten-free rice bread can be improved by controlling the decrease of adhesiveness, fracturability, and powdery mouthfeel.

• 한국식품영양학회지
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• 제28권6호
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• pp.1011-1018
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• 2015

The effects of mixing speed (3, 6 and 10 speed) and time (2, 5 and 10 min) on the dynamic viscoelasticity of dough and the baking properties of gluten-free rice bread were investigated. The specific gravity of the dough was not affected by the mixing speed and time before and after fermentation. The elasticity (G') and viscosity (G") of the dough increased and the tan ${\delta}$ (G"/G') decreased with higher mixing speeds and longer mixing times. The specific volume of the gluten-free rice bread was affected by the mixing time in response surface methodology (RSM). The hardness of the gluten-free rice bread showed a decreasing trend as the specific volume for the gluten-free rice bread increased. The appearance of the gluten-free rice bread was symmetrical at high mixing speeds and long mixing times. Overall results indicated that the quality of gluten-free rice bread could be improved by controlling the mixing speeds and mixing times for the dough.

• 한국식품조리과학회지
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• 제33권1호
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• pp.28-36
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• 2017

Purpose: This study was conducted to understand the factors that affect the texture of gluten-free rice pasta prepared buckwheat, mung bean, and acorn starches and to compare textural properties of samples 100% semolina. Methods: The moisture content, weight and water absorption test investigated and texture profile analysis measured by texture analyzer. Results: 100% semolina sample's value was lower than gluten-free rice pasta moisture content, weight and water absorption test. moisture content weight was in pasta with mung bean starchin pasta with buckwheat starch. Texture profile analysis showed that increasing amount of buckwheat, mung bean, and acorn starches increased hardness, chewiness, cohesiveness and springiness, and decreased adhesiveness of gluten free rice pasta. Conclusion: This study suggested that adding buckwheat, mungbean and acorn starches could improve texture properties of gluten-free rice pasta.

• 한국식품조리과학회지
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• 제32권4호
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• pp.413-425
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• 2016

Purpose: This study was conducted to understand the factors that affect the acceptance of gluten-free rice pasta samples prepared with added buckwheat, mungbean, and acorn starches, and to compare sensory characteristics of samples with those of 100% semolina pasta. Methods: Descriptive analysis of pasta was conducted by 12 trained panels. Acceptance test was carried out by 40 consumers using 7-point hedonic scale. Collected data was statistically analyzed by principal component analysis, and partial least squares regression analysis. Results: Quantitative descriptive analysis showed that increasing amount of buckwheat, mungbean, and acorn starches resulted in significant improvement in gluten-free rice pasta properties, especially texture, hardness, chewiness, roughness, and al dente with increasing amount of sample starches, and decreased adhesiveness. In acceptance test, appearance and texture of gluten-free rice pasta with mungbean starch were preferred than pasta made with 100% rice. Flavor and taste was preferred in pasta with buckwheat starch than other pasta samples. Rice pasta with 30% buckwheat starch showed the highest score in overall acceptance among rice samples. Conclusion: This study suggested that adding mungbean starch could improve texture of gluten-free pasta, and adding buckwheat starch would improve taste and flavor of gluten-free rice pasta.

• 한국식품조리과학회지
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• 제33권2호
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• pp.218-227
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• 2017

Purpose: This study examined the influence of the consumption values on the attitudes and purchase intentions of consumers towards gluten-free products and compared consumption values, attitudes and purchase intentions according to the degree of health consciousness of the consumer. Methods: The data was collected from July 20, 2016 to August 2, 2016 through a questionnaire survey from three hundred and six consumers who had knowledge of gluten-free products. The data was analyzed by factor analysis, reliability analysis, multiple regression analysis, and an independent sample t-test using the SPSS program. Results: The regression results showed that the exploratory value (p<0.01) had a negative influence on the attitudes, and the functional value (p<0.001) and emotional value (p<0.001) had a positive influence on the consumers' attitudes. In addition, the attitudes (p<0.001) toward gluten-free products had a positive influence on the purchase intentions. Finally, the high health consciousness group answered with a significantly higher score on the consumption values, attitudes and purchase intentions than the lower group. Conclusion: These results highlight the causal relationship among consumption values, attitudes, and purchase intentions of consumers towards gluten-free products, and can provide a basic understanding of gluten free products regarding both marketing strategy and consumers' needs. The potential implications for gluten-free products manufacturers, limitations and future research directions are also discussed.

• Journal of Microbiology and Biotechnology
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• 제33권12호
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• pp.1671-1680
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• 2023

The gluten protein content in whole-wheat flour is low, which affects the elasticity and viscosity of the dough. Enzymatic modification of the protein may result in a network that mimics gluten, which plays an important role in the processing of whole-wheat foods. In this study, the effects of Halomonas alkaliantartica laccase (LacHa) on the quality parameters of whole-wheat bread were investigated. The optimum dosage of LacHa was 4 U/100 g of whole-wheat flour. At this dosage, whole-wheat bread exhibited the best specific volume and optimum texture parameters. Laccase also extended the storage duration of whole-wheat bread. We analyzed the micro-structure of the dough to determine its gluten-free protein extractable rate and free sulfhydryl group content, and verify that LacHa mediates cross-linking of gluten-free proteins. The results demonstrated that the cross-linking of gluten-free protein by LacHa improves the texture of whole-wheat bread. As a flour improver, LacHa has great developmental and application potential in baked-food production.

• 한국지역사회생활과학회지
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• 제26권3호
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• pp.447-456
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• 2015

To develop functional bread and improve the quality of gluten-free bread, this study investigates the quality characteristics of gluten-free rice bread made from soft-type rice (Bodeurami) flour mixed with black rice at different levels (0%, 10%, 20%, 30%, and 40%, w/w). An increase in the mix level of black-rice flour increased the weight of rice bread but reduced its volume, baking loss, volume expansion, and specific volume. The results for Hunter's color value and texture measurements indicate that an increase in the content of black-rice flour reduced the L-value, the b-value, hardness, gumminess, and chewiness but increased the a-value, adhesiveness, and springiness. According to the sensory analysis, rice bread formulated with a mixture of soft-type rice flour (80%) and black-rice flour (20%) showed the highest scores in color, taste, texture, and overall preferences. With respect to flavor and appearance, bread samples with 20% and 30% black-rice flour were preferred to those with 0%, 10%, and 40% black-rice flour. These results suggest that gluten-free rice bread mixed with wet-milling rice flour and black-rice flour can be used to develop functional and gluten-free bread.

• 동아시아식생활학회지
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• 제25권4호
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• pp.681-690
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• 2015

In this study, gluten-free noodles were developed and the physicochemical quality of gluten-free noodles added with nondigestible maltodextrin (NMD) was also investigated. The gluten-free noodles were prepared by addition of 0, 5, 7, and 9% NMD of total ingredients except water. Inhibition activities for ${alpha}$-amylase and ${alpha}$-glucosidase according to the addition amounts of NMD were evaluated. As a result, activities of carbohydrate-digestive enzymes decreased with an increase of the added NMD amounts. Water binding capacity and solubility of raw noodles increased upon NMD addition. Swelling power also increased as temperature rose. L value of raw noodles decreased with the addition of NMD, but b value increased. Texture profile analysis of cooked noodles showed reduction of hardness, springiness, and chewiness of noodles with NMD. On the other hand, tensile strength of cooked noodles containing up to 7% NMD was not significantly different from that of noodle without NMD. In the sensory evaluation, elasticity of noodles with 9% NMD was lower than that of other noodles, whereas other characteristics of noodles were not significantly different among noodles. Therefore, it was confirmed that the addition of 5~7% NMD had little effect on the sensory quality of noodles.

• 한국식품영양학회지
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• 제28권4호
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• pp.586-593
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• 2015

The baking properties of gluten-free rice bread with different percentages of corn starch and waxy corn starch were investigated. The specific gravity and color (L, a, b) of the dough as well as the appearance, color (L, a, b) and texture of the rice bread were analyzed. Replacement of rice flour with 1, 2.5, 5, 7.5 and 10% corn starch did not have a significant effect on the specific gravity and color of the dough. The volume and specific volume of the rice bread showed an increasing trend as the amount of added corn starch increased. The chewiness, gumminess and hardness of the rice bread showed a decreasing trend as the amount of added corn starch increased. Replacement of rice flour with 1, 5 and 10% waxy corn starch did not have a significant effect on the specific gravity and color of the dough. The color of the rice bread showed an increasing trend as the amount of added waxy corn starch increased. These results suggest that replacement of rice flour with 7.5% corn starch or 1% waxy corn starch is effective for gluten-free rice bread.

• 한국식품영양학회지
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• 제30권6호
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• pp.1184-1190
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• 2017

Baking characteristics of gluten-free rice bread were investigated, when 20, 30, 40, 50 and $60^{\circ}C$ water was added during mixing. The temperature of the dough before fermentation was affected by the temperature of the water and the mixing time. When $60^{\circ}C$ water was added, the specific gravity of the dough was the highest before fermentation (p<0.01). The specific gravity of the dough after fermentation was 32~39% of the specific gravity of the dough before fermentation. When $50^{\circ}C$ water was added, the volume and the specific volume of rice bread were higher than those in addition of water at other temperatures (p<0.001). In case of adding water of $50^{\circ}C$, the shape of the rice bread showed the largest volume, high appearance and a round shape. After storage for 2 and 24 hours, the addition of water of $50^{\circ}C$ resulted in the lowest hardness and chewiness values of rice bread. The sensory descriptive analysis revealed that when $50^{\circ}C$ water was added, the air cell size, springiness and hardness values of gluten-free rice bread were lower than those in addition of water at other temperatures. There was a difference in the appearance and texture of gluten-free rice bread, when 20, 30, 40, 50 and $60^{\circ}C$ water was added during mixing.