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http://dx.doi.org/10.7318/KJFC/2019.34.5.629

Effects of Adding Green Grape Juice on Quality Characteristics of Konjak Jelly  

Jeon, Jae-Eun (Major in Food and Nutrition, Kunsan National University)
Lee, In-Seon (Major in Food and Nutrition, Kunsan National University)
Publication Information
Journal of the Korean Society of Food Culture / v.34, no.5, 2019 , pp. 629-636 More about this Journal
Abstract
This study examined the quality characteristics of jelly prepared with green grape juice (GJ). The pH, $^{\circ}Brix$ value, color, texture, and sensory evaluation of the jelly were measured. The pH of the jelly significantly decreased with increasing amount of GJ over the range of 3.25-5.27. The $^{\circ}Brix$ value of the jelly showed a significantly higher result as the amount of GJ increased (p<0.001). Lightness (L) and redness (a) decreased with increasing amount of GJ, and yellowness (b) increased. In the texture measurement, the GJ-100 sample group with a high substitute rate of GJ showed high hardness, gumminess, and chewiness (p<0.001). The results of principal component analysis (PCA) showed that the sample groups with high GJ content were classified as having relatively strong yellowness, sweet aroma, metallic aroma, grassy aroma, sweetness, sourness, green grape skin taste, and astringency. In the acceptance test, the GJ-50 sample group was evaluated to be high in flavor (p<0.001) and overall acceptance (p<0.01). However, sample groups consisting of 50% or more GJ were evaluated to be significantly strong in terms of astringency. Therefore, further study needs to be conducted about improving astringency in the future.
Keywords
Green grape; jelly; konjak;
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