Hye-Ryun Kim

Quality Properties of Makgeolli Brewed with Various Rice and Koji

본 연구에서는 쌀 품종을 달리하여 제조한 입국을 사용하여 각각의 쌀 품종 별로 탁주를 제조하였다. 19품종의 쌀로 제조한 입국은 쌀 품종에 관계없이 산도 5.0 이상, 당화력 60 이상의 입국기준의 조건을 충족하였다. 입국을 사용하여 담금 한 막걸리의 알코올 함량은 11.5-14.5%(v/v)로 나타났으며 발효가 진행되는 동안...

Quality Analysis of Diverse Rice Species for Rice Products

The objective of this study was to analyze proximate composition and physicochemical properties according to different kinds of rice. In total, 20 varieties of rice were used (Domestic-19, Imported-1). The moisture contents ranged from 11.11±0.20 to 3.28±0.03%. The crude protein and crude lipid contents were ranged from 5.04±0.03 to 7.02±0.10% and 0.18±0.01 to 0.73±0.05%, respectively. The mineral contents were Calcium, 3.56±0.11-6.69±0.08 mg/100 g; Sodium, 3.39±0.01-17.43±0.04 mg/100 g; Phosphorus, 64.12±0.88-102.0±0.36 mg/100 g; Zinc, 0.95±0.01-1.75±0.0 mg/100 g; Iron, 0.19±0.0-0.69±0.02 mg/100 g; Magnesium, 9.89±0.47-23.310.21 mg/100 g; Potassium, 47.11±3.49-82.19±1.08 mg/100 g; and Manganese, 0.47±0.0-1.14±0.01 mg/100 g. Eighteen kinds of rice exhibited small kernels. Amylose contents ranged from 10.3±1.27 to 19.4±0.15%, while starch value ranged from 70.8±2.67 to 80.1±5.09%. Alkali digestion value was described as 5-6 grade and gel consistency was shown to be ‘soft’ regardless of the rice kinds.The objective of this study was to analyze proximate composition and physicochemical properties according to different kinds of rice. In total, 20 varieties of rice were used (Domestic-19, Imported-1). The moisture contents ranged from to . The crude protein and crude lipid contents were ranged from to and to , respectively. The mineral contents were Calcium, ; Sodium, ; Phosphorus, ; Zinc, ; Iron, ; Magnesium, ; Potassium, ;and Manganese, . Eighteen kinds of rice exhibited small kernels. Amylose contents ranged from to , while starch value ranged from to . Alkali digestion value was described as 5-6 grade and gel consistency was shown to be `soft` regardless of the rice kinds.

Manufacture of Koji Using fungi Isolation from Nuruk and Identification of Koji Molds

Korea Food Research Institute, Seongnam 463-746, Korea(Received 16, November 2012., Revised 21, November 2012., Accepted 27, November 2012)ABSTRACT: Various koji were prepared by fungi isolated from traditional nuruk and their quality characteristicswere investigated. Acidity and saccharification power of their koji were ranged in 5.0~6.8 and 128sp~241sp. Ninefungi which were showed good quality and sensory evaluation were identified by analysis of their nucleotidesequences with PCR-amplified 18S rDNA internal transcribed spacer-1(ITS-1) and ITS-4 genes. Among them, sixstrains were identified as Aspergillus oryzae and the other strains were identified as Mycocladus corymbiferus, Rhizo-pus oryzae, Lichtheimia corymbifera.KEYWORDS : Aspergillus oryzae, Koji, Lichtheimia corymbifera, Mycocladus corymbiferus, Nuruk, Rhizopus oryzae

Restoration of Traditional Korean Nuruk and Analysis of the Brewing Characteristics

In this study, a total of 58 different kinds of nuruk (a traditional Korean fermentation starter) were prepared, including 46 kinds of restored nuruk from ancient documents. Each nuruk was evaluated by analysis of its saccharification power, and the enzyme activities of glucoamylase, α-amylase, β-amylase, protease, and β-glucanase. The range of saccharification power (sp) of the restored nuruk ranged between 85 and 565 sp. The diastatic enzymes, α-amylase, β-amylase, and glucoamylase, were significantly correlated to the saccharification power value; conversely, β-glucanase and protease did not have a correlative relationship with saccarification power. In addition, their brewing properties on chemical and organoleptic aspects of traditional alcoholic beverage production were compared. Each raw and supplementary material contained in nuruk showed its own unique characteristics on Korean alcoholic beverage brewing. For the first time, in this study, the traditional Korean nuruk types mentioned in ancient documents were restored using modernized production methods, and also characterized based on their brewing properties. Our results could be utilized as a basis for further study of traditional alcoholic beverages and their valuable microorganisms.

Identification of sensory attributes that drive the likeability of Korean rice wines by American panelists. [Corrected].

Six commercial Korean rice wines were described their sensory profiles by trained American panelists, and assessed acceptances by American subjects to identify the drivers of liking and disliking factors. Thirteen statistically different descriptive attributes were defined for Korean rice wines: aromas (apple, pear, earthy, peach, nutty, yeasty, honey), flavor (yeasty, nutty), taste (sweet, sour, bitter), and aftertaste (apricot). Samples A and F were characterized as sweet taste and fruity attributes, and sample C was characterized as being pear flavor and bitter taste. Sample B exhibited a strong earthy aroma, determined as the aroma of ginseng. The American subjects could not identify ginseng aroma due to their lack of experience in ginseng. Samples D and E were described as nutty and yeasty. In consumer test, consumer preference was skewed to sample A, for which the consumer preference revolved around the sweet, sour, and fruity characteristics of the sample by the principal component analysis. Few consumers expressed preference toward samples D and E, as evidenced by the lowest consumer acceptance ratings. Partial least squares regression revealed that the key liking factors of Korean rice wines were sweet, sour, and apricot flavors. Fruity characteristics (peach, apple, and pear) were also positively correlated with overall acceptance. The key disliking factors were yeasty and nutty characteristics. American subjects regarded Korean rice wine as belonging to the wine category, prompting them to grant the highest rank to sample A, which has similar characteristics to semisweet white wine.

Identification of Senory Attributes That Drive the Likeability of Korean Rice Wines by American Panelists: Drivers of liking for Korean rice wines…

Six commercial Korean rice wines were described their sensory profiles by trained American panelists, and assessed acceptances by American subjects to identify the drivers of liking and disliking factors. Thirteen statistically different descriptive attributes were defined for Korean rice wines: aromas (apple, pear, earthy, peach, nutty, yeasty, honey), flavor (yeasty, nutty), taste (sweet, sour, bitter), and aftertaste (apricot). Samples A and F were characterized as sweet taste and fruity attributes, and sample C was characterized as being pear flavor and bitter taste. Sample B exhibited a strong earthy aroma, determined as the aroma of ginseng. The American subjects could not identify ginseng aroma due to their lack of experience in ginseng. Samples D and E were described as nutty and yeasty. In consumer test, consumer preference was skewed to sample A, for which the consumer preference revolved around the sweet, sour, and fruity characteristics of the sample by the principal component analysis. Few consumers expressed preference toward samples D and E, as evidenced by the lowest consumer acceptance ratings. Partial least squares regression revealed that the key liking factors of Korean rice wines were sweet, sour, and apricot flavors. Fruity characteristics (peach, apple, and pear) were also positively correlated with overall acceptance. The key disliking factors were yeasty and nutty characteristics. American subjects regarded Korean rice wine as belonging to the wine category, prompting them to grant the highest rank to sample A, which has similar characteristics to semisweet white wine.