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Pohang, South Korea

Kim N.-K.,Konkuk University | Park J.-M.,Konkuk University | Lee J.-H.,Konkuk University | Kim H.-J.,Konkuk University | And 4 more authors.
Korean Journal for Food Science of Animal Resources | Year: 2015

Yogurt powder is fermented milk processed in the form of dry yogurt, and has advantages such as stability, storability, convenience, and portability. China and Vietnam are important export target countries because of the increased demand for dairy products. Therefore, we surveyed dairy product standardization in order to establish an export strategy. Lactic acid bacteria counts are unregulated in Korea and Vietnam. In China, lactic acid bacteria counts are regulated at 1×106 colonyforming units (CFU)/mL and detected at 6.24±0.33 Log CFU/mL. All three countries have regulated standards for total bacterial counts. In China, total bacterial counts of milk powder are regulated to n=5, c=2, m=50,000, M=200,000 and detected at 6.02±0.12 Log CFU/mL, exceeding the acceptable level. Lactic acid bacterial counts appeared to exceed total bacterial counts. Coliform group counts, Staphylococcus aureus, Listeria monocytogenes, and Salmonella species were not detected. Acidity is not regulated in Korea and Vietnam. In China, acidity was regulated to over 70°T and detected 352.38±10.24°T. pH is unregulated in all three countries. pH was compared to that of general fermented milk, which is 4.2, and that of the sample was 4.28±0.01. Aflatoxin levels are not regulated in Korea and China. In Vietnam, aflatoxin level is regulated at 0.05 ppb. Therefore, all ingredients of the yogurt powder met the safety standards. This data obtained in this study can be used as the basic data in assessing the export quality of yogurt powder.


Lee J.S.,Chung - Ang University | Kim M.S.,Chung - Ang University | Shin H.J.,R and nter Maeil Dairies Co. | Park K.-H.,Chung - Ang University
Korean Journal of Food Science and Technology | Year: 2011

To verify the volatile compounds contributing to coffee off-flavor, medium roasted Colombian, Sumatra, Ethiopian and light and dark roasted Colombian bean coffees were sequentially and studiously over extracted. Eight espresso samples and eight filter-dripped samples were analyzed by gas chromatography/mass spectrometry with the solidphase microextraction method and evaluated by sensory tests. In total, 67 compounds were detected, and desirable aroma decreased sharply, while off-flavors increased rapidly after 30 mL of espresso and 200 mL of drip coffee. Percent peak area of 4-ethylguaiacol revealed a linear increase during extraction and was highly correlated with increasing off-flavor, suggesting that it could be an indicator of over extraction. Considering the odor activity value, guaiacol and 4-vinylguaiacol were also contributory compounds to off-flavors. © The Korean Society of Food Science and Technology.


Ko J.A.,Korea University | Jeon J.Y.,Korea University | Jeon J.Y.,R and nter Maeil Dairies Co. | Park H.J.,Korea University | Park H.J.,Clemson University
Journal of Food Biochemistry | Year: 2012

The objective of this study was to establish the ability of microencapsulation to entrap allyl isothiocyanate (AITC) and extend its shelf life. Microcapsules were prepared by spray drying after emulsification, using different mass ratios of gum arabic (GA) to AITC (3:1, 4:1, 5:1 and 6:1) with tween20 or span80. The microencapsulation efficiency and release characteristics of GA/AITC microcapsules were investigated. Retention of AITC during spray drying was increased as the mass ratio of GA to AITC increased. The Avarami's parameter n values of all AITC powders indicated that release of AITC was controlled by diffusion through the wall of the particles. The release rate of AITC was not only dependent on the emulsifier type, but also on the mass ratio of GA to AITC. The highest retention of AITC was achieved at a GA:AITC mass ratio of 4:1 in 0.7% tween20. © 2011 Wiley Periodicals, Inc.


Song T.-S.,Yonsei University | Kim J.-Y.,Yonsei University | Kim K.-H.,Yonsei University | Jung B.-M.,R and nter Maeil Dairies Co. | And 2 more authors.
Food Science and Biotechnology | Year: 2010

Four strains and 2 strains of lactic acid bacteria (LAB) were isolated from the commercial yogurt and kimchi products in Korea, respectively. Based on the 16S rRNA sequencing data, strain A from a drink-type yogurt manufactured by dairy company S, was a Gram-positive, rod-shaped Lactobacillus helveticus, and both strain B (company N) and D (company H) were identified as L. casei ssp. casei, and strain C (company L) as L. paracasei. None of yogurt strain B and D was recovered from the samples exposed to the simulated gastric juice, pH 2.0 for 1.5 hr. Of the 6 isolates tested, strain YS93 from kimchi was the most resistant to acidic condition using the simulated gastric juice, pH 2.0. Moreover, it was shown that 2 kimchi isolates and yogurt strain D produced antibacterial substances, probably bacteriocin-like peptide, which was inhibitory against Staphylococcus aureus as an indicator. In an adhesion assay using a Caco-2 cell, the adherence activity of kimchi strains YS29 and YS93 was significantly higher than those of 4 yogurt starter strains tested. © KoSFoST and Springer 2010.

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