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Establishing Quantitative Standards for Residual Alkaline Phosphatase in Pasteurized Milk
Kim, Dong-Hyeon,Chon, Jung-Whan,Lim, Jong-Soo,Kim, Hong-Seok,Kang, Il-Byeong,Jeong, Dana,Song, Kwang-Young,Kim, Hyunsook,Kim, Kwang-Yup,Seo, Kun-Ho Korean Society for Food Science of Animal Resource 2016 한국축산식품학회지 Vol.36 No.2
The alkaline phosphatase (ALP) assay is a rapid and convenient method for verifying milk pasteurization. Since colorimetric ALP assays rely on subjective visual assessments, their results are especially unreliable near the detection limits. In this study, we attempted to establish quantitative criteria for residual ALP in milk by using a more objective method based on spectrophotometric measurements. Raw milk was heat-treated for 0, 10, 20, 30, and 40 min and then subjected to ALP assays. The quantitative criteria for residual ALP in the milk was determined as 2 μg phenol/mL of milk, which is just above the ALP value of milk samples heat-treated for 30 min. These newly proposed methodology and criteria could facilitate the microbiological quality control of milk.
Kim, Dong-Hyeon,Lim, Hyun-Woo,Kim, Se-Hyung,Lee, Jun-Man,Chon, Jung-Whan,Song, Kwang-Young,Bae, Dongryeoul,Kim, Jinhyun,Kim, Hyunsook,Seo, Kun-Ho Korean Society of Dairy Science and Biotechnology 2018 한국유가공기술과학회지 Vol.36 No.3
In this study, the antibacterial activity of Aronia melanocarpa (black chokeberry) ethanol extract against Bacillus cereus, Staphylococcus aureus, Cronobacter sakazakii, and Salmonella Enteritidis was investigated using the spot-on-lawn assay. The results showed that this extract exhibited antibacterial activities against Bacillus cereus (complete inhibition) and Staphylococcus aureus (partial inhibition), but did not inhibit the growth of Cronobacter sakazakii and Salmonella Enteritidis. This study shows that the Aronia melanocarpa (black chokeberry) ethanol extract was more effective against Gram-positive bacteria than Gram-negative bacteria. Hence, it is suggested that Aronia melanocarpa could be a useful food supplement, and could be utilized as a naturally derived additive for maintaining the safety of various dairy products. Furthermore, future research should be conducted to examine the possibility of using such products as functional ingredients for improving the anti-oxidative and anti-inflammatory activities of food products.
Kim, Hong-Seok,Kim, Young-Ji,Chon, Jung-Whan,Kim, Dong-Hyeon,Yim, Jin-Hyeok,Kim, Hyunsook,Seo, Kun-Ho Elsevier 2017 Sensors and actuators. B Chemical Vol.239 No.-
<P><B>Abstract</B></P> <P> <I>Cronobacter sakazakii</I> constitutes one of the most life-threatening foodborne pathogens in neonates, and is typically acquired via contaminated powdered infant formula. In this study, we developed a sensitive and convenient two-stage label-free aptasensing platform for colorimetric detection of <I>C. sakazakii</I> in powdered infant formula. In this system, <I>C. sakazakii</I> depletes aptamers from the test solution, and the reduction of aptamers induces aggregation of gold nanoparticles in salt, a process accompanied by a color change from red to purple. Under optimal conditions, <I>C. sakazakii</I> present in PIF at a concentration as low as 7.1×10<SUP>3</SUP> CFU mL<SUP>−1</SUP> could be visually detected within 30min, with a linear range between 7.1×10<SUP>3</SUP> and 7.1×10<SUP>7</SUP> CFU mL<SUP>−1</SUP>. This novel assay provides new opportunities to detect bacteria in real-world samples.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A two-stage label-free aptasensing platform was established to detect <I>C. sakazakii.</I> </LI> <LI> This is the first report of an aptamer against <I>C. sakazakii</I>. </LI> <LI> This assay can detect <I>C. sakazakii</I> in PIF at a 7.1×10<SUP>3</SUP> CFU/mL detection limit. </LI> <LI> This assay requires only 30min or less to complete after sample enrichment. </LI> <LI> This platform may be applicable for detecting other bacteria in real-world samples. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Kim, Dong-Hyeon,Jeong, Dana,Oh, Yong-Taek,Kim, Hong-Seok,Kim, Yun-Gyeong,Song, Kwang-Young,Kang, Il-Byung,Kim, Young-Ji,Park, Jin-Hyeong,Chang, Ho-Seok,Lim, Hyon-Woo,Chon, Jung-Whan,Kim, Hyunsook,Jeon Korean Society of Dairy Science and Biotechnology 2017 한국유가공기술과학회지 Vol.35 No.1
Made using a natural mixed starter of lactic acid bacteria and yeast, Koumiss is a slightly alcoholic fermented mare's milk beverage, and a traditional drink of the nomadic populations of Central Asia. Cichorium intybus L. (chicory) is a sedative with potential cardioactive properties, and its oligosaccharides are beneficial in maintaining healthy gastrointestinal flora. Hence, in this study, we have generated a functional Koumiss containing two different concentrations of chicory. After fermentation of the Koumiss premix, the TA increased to 0.85~0.88%, and the pH decreased to ~4.3. The addition of either concentration of chicory had no significant effect on pH and TA. However, the taste, flavor, color, texture, and overall acceptability decreased in proportion to the added amount of chicory. This study has provided the first data on Koumiss supplemented with chicory. The results could be useful in developing high-quality Koumiss with functional activity using chicory, and allowing large-scale industrial production. Further studies are needed to determine if chicory root extract is beneficial for lifestyle-related diseases.
Kim, Tae-Eun,Ha, Na,Kim, Yunjeong,Kim, Hyunsook,Lee, Jae Wook,Jeon, Ji-Young,Kim, Min-Gul Dove Medical Press 2017 Drug design, development and therapy Vol.11 No.-
<P>Previous in vitro studies have demonstrated the inhibitory effect of green tea on drug transporters. Because rosuvastatin, a lipid-lowering drug widely used for the prevention of cardiovascular events, is a substrate for many drug transporters, there is a possibility that there is interaction between green tea and rosuvastatin. The aim of this study was to investigate the effect of green tea on the pharmacokinetics of rosuvastatin in healthy volunteers. An open-label, three-treatment, fixed-sequence study was conducted. On Day 1, 20 mg of rosuvastatin was given to all subjects. After a 3-day washout period, the subjects received 20 mg of rosuvastatin plus 300 mg of epigallocatechin-3-gallate (EGCG), a major ingredient of green tea (Day 4). After a 10-day pretreatment of EGCG up to Day 14, they received rosuvastatin (20 mg) plus EGCG (300 mg) once again (Day 15). Blood samples for the pharmacokinetic assessments were collected up to 8 hours after each dose of rosuvastatin. A total of 13 healthy volunteers were enrolled. Compared with the administration of rosuvastatin alone, the concomitant use at Day 4 significantly reduced the area under the concentration–time curve from time 0 to the last measurable time (AUC<SUB>last</SUB>) by 19% (geometric mean ratio 0.81, 90% confidence interval [CI] 0.67–0.97) and the peak plasma concentration (<I>C</I><SUB>max</SUB>) by 15% (geometric mean ratio 0.85, 90% CI 0.70–1.04). AUC<SUB>last</SUB> or <I>C</I><SUB>max</SUB> of rosuvastatin on Day 15 was not significantly different from that on Day 1. This study demonstrated that co-administration of EGCG reduces the systemic exposure of rosuvastatin by 19%, and pretreatment of EGCG can eliminate that effect of co-administration of EGCG.</P>
Kim, Hong-Seok,Kim, Young-Ji,Chon, Jung-Whan,Kim, Dong-Hyeon,Song, Kwang-Young,Kim, Hyunsook,Seo, Kun-Ho Korean Society of Dairy Science and Biotechnology 2017 한국유가공기술과학회지 Vol.35 No.4
This objectives of this study were to assess the pH and titratable acid (TA) and conduct sensory evaluation of the high-protein yogurt supplemented with Oxya chinensis sinuosa (grasshopper). High-protein yogurt containing Oxya chinensis sinuosa powder displayed TA of 0.93% to 1.1%, and a pH of 4.3 or 4.4. There were no significant differences between the control and treated groups in pH and TA. Organoleptic evaluations revealed that, except for color and texture, taste, flavor, and overall acceptability showed decreased trends in proportion to the amount of Oxya chinensis sinuosa powder. Further studies will explore the potential of Oxya chinensis sinuosa powder as a protein with health benefits for humans.
Comparison of Culture, Conventional and Real-time PCR Methods for Listeria monocytogenes in Foods
Kim, Dong-Hyeon,Chon, Jung-Whan,Kim, Hyunsook,Kim, Hong-Seok,Choi, Dasom,Kim, Young-Ji,Yim, Jin-Hyeok,Moon, Jin-San,Seo, Kun-Ho Korean Society for Food Science of Animal Resource 2014 한국축산식품학회지 Vol.34 No.5
We compared standard culture methods as well as conventional PCR and real-time PCR for the detection of Listeria monocytogenes (L. monocytogenes) in milk, cheese, fresh-cut vegetables, and raw beef that have different levels of background microflora. No statistical differences were observed in sensitivity between the two selective media in all foods. In total, real-time PCR assay exhibited statistically excellent detection sensitivity (p<0.05) and was less time consuming and laborious as compared with standard culture methods. Conventional culture methods showed poor performance in detecting L. monocytogenes in food with high levels of background microflora, generating numerous false negative results. While the detection of L. monocytogenes in fresh cut vegetable by culture methods was hindered only by L. innocua, various background microflora, such as L. innocua, L. welshimeri, L. grayi, and Enterococcus faecalis appeared on the two selective media as presumptive positive colonies in raw beef indicating the necessity of improvement of current selective media. It appears that real-time PCR is an effective and sensitive presumptive screening tool for L. monocytogenes in various types of foods, especially foods samples with high levels of background microflora, thus complementing standard culture methodologies.
Kim, Hong-Seok,Chon, Jung-Whan,Kim, Hyunsook,Kim, Dong-Hyeon,Yim, Jin-Hyuk,Song, Kwang-Young,Kang, Il-Byung,Kim, Young-Ji,Lee, Soo-Kyung,Seo, Kun-Ho Korean Society of Dairy Science and Biotechnology 2015 Journal of Dairy Science and Biotechnology (JMSB) Vol.33 No.4
Colloidal semiconductor CdSe-ZnS core-shell nanocrystal quantum dot (Qdot) are luminescent inorganic fluorophores that show potential to overcome some of the functional limitations encountered with organic dyes in fluorescence labeling applications. Salmonella Enteritidis has emerged as a major cause of human salmonellosis worldwide since the 1980s. A rapid, specific, and sensitive method for the detection of Salmonella Enteritidis was developed using Qdot as a fluorescence marker coupled with immunomagnetic separation. Magnetic beads coated with anti-Salmonella Enteritidis antibodies were employed to selectively capture the target bacteria, and biotin-conjugated anti-Salmonella antibodies were added to form sandwich immune complexes. After magnetic separation, the immune complexes were labeled with Qdot via biotin-streptavidin conjugation, and fluorescence measurement was carried out using a fluorescence measurement system. The detection limit of the Qdot method was a Salmonella Enteritidis concentration of $10^3$ colony-forming units (CFU)/mL, whereas the conventional fluorescein isothiocyanate-based method required over $10^5CFU/mL$. The total detection time was within 2 h. In addition to the potential for general nanotechnology development, these results suggest a new rapid detection method of various pathogenic bacteria from a complex food matrix.
( Hong Seok Kim ),( Jung Whan Chon ),( Hyunsook Kim ),( Dong Hyeon Kim ),( Jin Hyuk Yim ),( Kwang Young Song ),( Il Byung Kang ),( Young Ji Kim ),( Soo Kyung Lee ),( Kun Ho Seo ) 한국유가공기술과학회 2015 Journal of Dairy Science and Biotechnology (JMSB) Vol.33 No.4
Colloidal semiconductor CdSe-ZnS core-shell nanocrystal quantum dot (Qdot) are luminescent inorganic fluorophores that show potential to overcome some of the functional limitations encountered with organic dyes in fluorescence labeling applications. Salmonella Enteritidis has emerged as a major cause of human salmonellosis worldwide since the 1980s. A rapid, specific, and sensitive method for the detection of Salmonella Enteritidis was developed using Qdot as a fluorescence marker coupled with immunomagnetic separation. Magnetic beads coated with anti-Salmonella Enteritidis antibodies were employed to selectively capture the target bacteria, and biotin-conjugated anti-Salmonella antibodies were added to form sandwich immune complexes. After magnetic separation, the immune complexes were labeled with Qdot via biotin-streptavidin conjugation, and fluorescence measurement was carried out using a fluorescence measurement system. The detection limit of the Qdot method was a Salmonella Enteritidis concentration of 10(3) colony-forming units (CFU)/mL, whereas the conventional fluorescein isothiocyanate-based method required over 10(5) CFU/mL. The total detection time was within 2 h. In addition to the potential for general nanotechnology development, these results suggest a new rapid detection method of various pathogenic bacteria from a complex food matrix.