• Food Science of Animal Resources
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• v.44 no.2
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• pp.443-463
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• 2024

This study investigated the impact of activated carbon, palm activated carbon, and zeolite on horse oil (HO) extracted from horse neck fat using supercritical fluid extraction with deodorant-untreated HO (CON) as a comparison. The yield and lipid oxidation of deodorant untreated HO (CON) were not significantly affected by the three deodorants. However, deodorant-treated HOs exhibited significantly elevated levels of α-linolenic acid (C18:3n3) and eicosenoic acid (C20:1n9) compared to CON (p<0.05), while other fatty acids remained consistent. Zeolite-purified HO demonstrated significantly lower levels of volatile organic compounds (VOCs) than other treatments (p<0.05). Remarkably, zeolite decreased the concentration of pentane, 2,3-dimethyl (gasoline odor), by over 90%, from 177.17 A.U. ×10⁶ in CON to 15.91 A.U. ×10⁶. Zeolite also effectively eliminates sec-butylamine (ammonia and fishy odor) as compared to other deodorant-treated HOs (p<0.05). Additionally, zeolite reduced VOCs associated with the fruity citrus flavor, such as nonanal, octanal, and D-limonene in HO (p<0.05). This study suggests that integrating zeolite in supercritical fluid extraction enhances HO purification by effectively eliminating undesirable VOCs, presenting a valuable approach for producing high-quality HO production in the cosmetic and functional food industries.

• Korean Journal of Food Science and Technology
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• v.23 no.1
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• pp.98-101
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• 1991

To investigate the aroma difference of commercial Korean green tea caused by manufacturing process and harvesting time, analysis of aroma concentrates of steamed green teas(1st tea, 2nd tea) and parched green teas(1st tea, 2nd tea) was accomplished. Steamed green tea, which had a briskness, greenish odor and sweet-floral odor, contained large amounts of terpene alcohols such as linalool, nerolidol, ketones such as cis-jasmone, 2,6,6-trimethyl-2-hydroxycyclohexanone and indole, Parched green tea, which had a slightly greenish odor and floral, roast odor, contained large amounts of terpene alcohols such as linalool, geraniol, aromatic alcohols such as benzylalcohol, phenylethanol and phenol, indole. Almost same tendency of odor component change of 1st tea and 2nd tea differed to harvesting time being observed in steamed tea and parched tea. In 2nd tea of both samples, aliphatic alcohols such as 1-penten-3-ol, cis-2-penten-1-al and two 2, 4-heptadienal(cis, trans and trans, trans) increased remarkably. It seems that these four components effects on the grade of the odor.

• Korean Journal of Food Science and Technology
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• v.39 no.1
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• pp.99-103
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• 2007

In order to evaluate innate flavor during the roasting process, the components responsible for the aroma of unroasted Polygonatum odoratum root and the volatile odor components released during the roasting process were evaluated using the solid phase-microextraction (SPME) headspace method. The raw P. odoratum root contained aldehyde, alcohol, hydrocarbon and acid components, which gave it a grass-like smell. 2-Methylpyrazine was not revealed from the roasted P. odoratum root at $110^{\circ}C$ and $130^{\circ}C$, but was extracted at $150^{\circ}C$. The 2,5-dimethylpyrazine component was the greatest at $130^{\circ}C$. The hexanal component was greater when the root was roasted at $110^{\circ}C$, compared with those at $130^{\circ}C$ and $150^{\circ}C$. The production of 2-acetyl-1-pyrroline component was the greatest when it was roasted at $130^{\circ}C$. Quantitative descriptive analysis of P. odoratum after roasting revealed a high concentration of 2,5-dimethylpyrazine at $130^{\circ}C$ and $150^{\circ}C$, but a low concentration at $110^{\circ}C$. Most of the 2-acetyl-1-pyrroline, which significantly affected its smell, was revealed at $130^{\circ}C$.

• Journal of the Korean Society of Food Science and Nutrition
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• v.36 no.6
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• pp.807-812
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• 2007

In order to enhance the flavor and storage stability of meat sauce, the manufacturing process of fermented beef-rib sauce was developed in a two-step process. The fermented sauce base was manufactured with Zygosaccharomyces rouxii Y-80 yeast cultivation in raw sauce ingredients for 3 days at $25^{\circ}C$. The fermented beef-rib sauce (FBS) was produced by mixing fermented sauce base with side ingredients. Comparison of the physicochemical and sensory properties with non-fermented beef-rib sauce (NFBS) revealed that the content of ethanol and volatile flavor compounds were higher in FBS; also, the result of sensory evaluation showed that FBS obtained excellent scores for overall taste. To determine the storage stability, FBS and NFBS were incubated at $25^{\circ}C$ for 7 days. The extent of decrease of pH and increase of titratable acidity in NFBS were faster than FBS. After 7 days, ethanol concentrations in FBS and NFBS were 3.77% and 2.04%, respectively. Therefore, based on these results, it can be suggested that storage stability of FBS is superior.

• Korean Journal of Food Science and Technology
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• v.47 no.2
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• pp.204-210
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• 2015

Makgeolli is made from rice or flour, yeast, and nuruk, a fermentation starter. The flavor of makgeolli is affected by sugars, amino acids, organic acids and volatile flavor compounds produced by various microorganisms. In this study, lactic acid bacteria (LAB) were isolated from unsterilized makgeolli samples collected from several provinces in Korea, and then later identified. Under anaerobic conditions, LAB density ranged from $5.0{\times}10^6$ to $1.5{\times}10^8CFU/mL$; yeast density ranged from $2.5{\times}10^7$ to $1.5{\times}10^8CFU/mL$. Of the LAB isolated from makgeolli, 1,126 were analyzed using restriction fragment length polymorphism (PCR-RFLP) analysis of 16S rRNA, which allowed for classification into five groups. Of the 1,126 LABs tested, 130 produced ${\gamma}$-aminobutyric acid (GABA).

• Journal of the Korean Society of Food Science and Nutrition
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• v.43 no.7
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• pp.1017-1024
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• 2014

This study was carried out to develop mulberry wines fermented with traditional microorganisms (Saccharomyces cerevisiae B-8). S. cerevisiae B-8 is a traditional fermentation microorganism isolated from domestically grown Rubus occidentalis. Each S. cerevisiae B-8 and Fermivin was inoculated into mulberry up to $1{\times}10^9$ CFU/kg, followed by incubation at $25^{\circ}C$ for 10 days. Mulberry fermented with S. cerevisiae B-8 (MBB) had a high alcohol content (16.47%), and the fermentation rate of MBB was faster than that of mulberry fermented with Fermivin (MBF). The total polyphenol and flavonoid contents of MBB were higher than those of MBF. DPPH radical scavenging activity of MBB was as high as that of MBF. ABTS radical scavenging activity of MBF was higher than those of MBB and mulberry juice (MBJ). In addition, reducing power of MBB was much higher than other samples. Flavor constituents of the two fermented wines were analyzed by gas chromatography and mass spectrometry. Twenty-three compounds from the sample were separated and identified as fifteen esters, six alcohols, an aldehyde, and an acetate. Particularly, tetradecanoic acid, ethyl ester of orris and violet flavor were ten times more abundant in MBB than in MBF. Several ester components were two times more abundant in MBB than in MBF. In conclusion, current findings indicate that MBB might have better antioxidant activities with flavor, which contributes to improved wine production with high quality and function.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.19 no.8
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• pp.466-473
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• 2018

The purpose of this study is to develop a distilled soju with high quality and stable brewing technology by analyzing the changes of general components and volatile components in the production of distilled soju by the use of fermentation agent such as koji and nuruk. White rice flour was used as a main raw material. White koji, yellow koji, traditional nuruk, and improved nuruk were used as a fermentation agent respectively. Also, yellow koji, traditional nuruk, and improved nuruk were added at a certain ratio to prepare white koji. The distillate was prepared by vacuum distillation and the quality characteristics were compared and analyzed. When the fermentation agent was used alone, the alcohol content was higher in the order of white koji, improved nuruk, yellow koji, and traditional nuruk. The initial acidity was higher than that of other fermentation agents and the highest alcohol content was found to be helpful for stable brewing. The highest content of higher alcohol was found in the yellow koji mash, and ethyl acetate was the highest in the traditional nuruk. When the fermentation agents were mixed, there was no difference in the alcohol content between $1^{st}$ fermentation mash and $2^{nd}$ fermentation mash. On the other hand, the content of higher alcohol was increased with the increase of the input ratio of yellow koji, and it decreased with the increase of the ratio of traditional and improved nuruk. It is expected that it will be possible to manufacture various distilled soju with different flavor and aroma if the yellow koji and the traditional nuruk are appropriately used based on the white koji having excellent fermentation characteristics and it will be very helpful for improving the stability and quality of brewing.

• Journal of the Korean Society of Food Science and Nutrition
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• v.46 no.7
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• pp.848-856
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• 2017

This study aimed to investigate the effect of rice nuruk prepared from rice with different degrees of milling (0, 10, 30, 50, and 70%) on physicochemical qualities of yakju. The results indicated significant differences in the qualities of yakju prepared using rice nuruk from rice with different degrees of milling. Specially, pH, amino acidity, brownness, b value, and color difference were significantly reduced as the degrees of milling increased, whereas contents of alcohol and volatile acid, reducing sugar, and L value were increased. Malic acid, succinic acid, and lactic acid were the main organic acids in yakju, and there were significant differences among the treatments in malic acid, lactic acid. However, there was no tendency according to different degrees of milling. In addition, contents of total free amino acids and nitrogen compounds showed no tendency according to degrees of milling, whereas the content of aspartic acid showed a tendency to decrease significantly. The content of 2-phenyl alcohol in the volatile flavor components showed a tendency to increase significantly with higher degree of milling of rice nuruk, whereas contents of n-propanol and iso-amyl alcohol tended to decrease significantly.

• Korean Journal of Food Science and Technology
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• v.28 no.6
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• pp.1171-1176
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• 1996

The changes in volatiles of the model system were analyzed by GC and GC-MS before and after retorting. The GC data were analyzed statistically by applying the analysis of variance, and 42 peaks were selected at 5% significance level. Multivariate statistical analysis was performed with these 42 peaks as independent variables. Through the stepwise discriminant analysis, 8 peaks, which corresponded to the compounds such as 2-heptanone, cis-3-hexenal, 2-pentyl-furan, 1-methyl-trans-1,2-cyclohexanediol, 2-hexanone, 3-octanone, trans, trans-nona-2,4-dienal and 1-octen-3-ol, were obtained in sequence to distinguish the samples with and without retorting. The principal component analysis of a set of 8 independent variables resulted in 3 principal components which accounted for 96.1% of the variance, while the first principal component (PC 1) explained 76.5% of the total variance. In addition, through the factor analysis of the principal components, the peaks 11, 20 and 21 could be grouped togather in accordance with the direction and the size while the peaks 9, 33 and 39 constituted the second group in the direction.

• Food Science and Preservation
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• v.15 no.2
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• pp.243-252
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• 2008

We investigated the physicochemical properties of Ganjang added to a medicinal herb extract (functional Ganjang). 1be proximate compositions of conventional Ganjang (control) and functional Ganjang (supplemented with 3% or 5% of an hem extract) were not significantly different Analysis of total and free amino acids indicated 17 different amino acids in both types of Ganjang. Glutamic acid was the most common, followed by valine, leucine, isoleucine, lysine, methionine, phenylalanine, and threonine. Sensory tests of conventional and functional Ganjang found no significant differences. An analysis of flavoring components indicated that flavor-active compounds (paeonol, senkyunolide A, and cnidilide) were present in both forms of Ganjang. Our results suggest that the extract could be used to manufacture fermented soybean products.