• The Korean Journal of Food And Nutrition
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• v.32 no.5
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• pp.401-407
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• 2019

This study compares and analyzes inorganic components of four different Pu-erh tea species consumed in Korea. The criteria for the inorganic components was based on the Royal Institute of Technology (KTH) recommendations. Out of the 19 general items: potassium, manganese, silicon and fluorine were detected in amounts exceeding the maximum allowable concentration by 5~23, 57~91, 1.6~1.8 and 9~18 times respectively. Out of the 15 potentially harmful elements: aluminum and nickel were exceeded the Maximum allowable concentration by 9~14 times and 0.8~1.2 times respectively. To reduce the concentration of inorganic elements in excess of the maximum allowable concentration, the extraction time of tea should be less than 1 minute in addition to limiting the amount. The amount of Pu-erh tea for extraction was about 0.1 g manganese, about 0.3 g potassium, about 0.5 g fluoride and about 2 g silicon. Therefore, the maximum amount of tea for extraction should be 0.1 g in regards to the safety of Pu-erh tea. Based on the recommended maximum daily intake of inorganic ingredients by the Ministry of Food and Drug Safety, it is desirable that the number of extractions be less than three.

• Microbiology and Biotechnology Letters
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• v.50 no.4
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• pp.465-476
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• 2022

The importance of beneficial microorganisms, particularly probiotics, that coexist in the human body, is being increasingly recognized. Probiotics are representative health functional foods that provide health benefits to humans through the production of various metabolites, including short-chain fatty acids. However, the health benefits are strain-specific, and the use of each probiotic strain should follow guidelines that assure its safety. Accurate identification of the strain should be managed through genetic and phenotypic analyses of the strain. Besides, the functionality of probiotics should be disclosed in vitro and in vivo so that they can be used as legal functional ingredients (i.e., individual standards). In this review, we deal with the guidelines, including the technical factors related to probiotic strains. The common health effects of probiotic strains include proliferation of beneficial bacteria, control of harmful bacteria, and facilitation of bowel activities. Probiotics with various functionalities (e.g., body fat and cholesterol reduction, vaginal health, and improvement of skin's immune system) have been investigated as "individual standards of raw materials for health functional foods" provided by MFDS. In the future, various biotechnologies including synthetic biology can be applied to produce customized probiotics to improve human health.

• Journal of Korean society of Dental Hygiene
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• v.23 no.4
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• pp.227-234
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• 2023

Objectives: Cetylpyridinium chloride CPC-based mouthwashes are well known to have no harmful ingredients in the mouth and can be used for a long time. The purpose of this study was to evaluate the effect of using CPC-based mouthwashes to suppress the biofilm formation and antibiotics for handling orthodontic appliances. Methods: To measure the antibacterial effect, Streptococcus mutans (S. mutans) cultured orthodontic appliances were precipitated in Gargreen and Polident for 5 minutes, incubated at 37℃ for 24 hours(h). In order to measure the biofilm removal effect, the degree of biofilm formation on the orthodontic appliances was stained with a methylene blue and the difference before and after was compared using image J software program (NIH Image J; NIH, Bethesda, MD). Results: The viability of S. mutans according to the concentration showed that Gargreen and Polident inhibited colony formation compared to the control, respectively (p<0.01). The degree of biofilm formation was significantly higher in the control, however both Gargreen and Polident significantly reduced it compared to the before and after condition on removable orthodontic appliances (p<0.01). Conclusions: This study suggests that the use of Gargreen, a cetylpyridinium chloride based oral cleaning cleanser, could be replaced by Polident for antibacterial effect and biofilm formation on removable orthodontic appliances.

• Analytical Science and Technology
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• v.20 no.2
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• pp.176-182
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• 2007

The present study relates to a matrix-typed, sustained-releasing agent comprising agrochemical effective ingredients being capable of recognizing a content of moisture, and a preparation method thereof. The curdlan solution added to acid was formed matrix which has unique network structure. The matrix treated by heat lost water solubility. The network structure of matrix was opened in the aquatic condition but closed again in dry condition. Therefore, in the sustained-releasing formulation system, an agrochemical effective ingredient was released from the formulation only in the aquatic condition. Use of the composition according to the product can control a manifesting time of effects of agrochemicals and can provide agrochemicals with reduced harmful damages.

• The Journal of the Convergence on Culture Technology
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• v.8 no.6
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• pp.943-951
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• 2022

In this study, 8 kinds of fruits and vegetables such as apples, pears and radishes were cut and hot water extracts and Steamed hot water extract from fruits and vegetables were prepared and used as experimental substrates. As a result of fermenting with 1% (W/V) red ginseng extract (W/V) and 8 types of lactic acid bacteria mixed starter added to the lactic acid bacteria fermented extract, the pattern and content of ginsenosides were almost unchanged in the fruit and vegetable extract group and the steam treatment group. However, in the lactic acid bacteria fermented group, the TLC pattern was changed according to the fermentation process and treatment, and the content of ginsenosides converted into Rg₃(S) and Rg₅ increased. No change in the number of lactic acid bacteria (cfu) was observed in all four types of fruit and vegetable extracts. The number of lactic acid bacteria CFU was slightly decreased in the four fermented groups of fruit and vegetable extracts, but the growth inhibitory effect of beneficial bacteria was not significant. The growth inhibitory effect of the three harmful bacteria was not affected by the growth of E. coli and Pseudomonas in the four fruit and vegetable extracts. However, the proliferation of Salmonella was inhibited, which was confirmed as the growth inhibitory effect of the fruit and vegetable extract regardless of whether the steamed hot water extract or red ginseng extract was added.

• Journal of the Society of Cosmetic Scientists of Korea
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• v.49 no.3
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• pp.213-223
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• 2023

A total of 81 handmade soaps on sale on the market were collected from January to November 2022. To compare quality characteristics, all ingredients were referred to, and the pH, dry reduction, heavy metals (lead, arsenic, cadmium, antimony, and mercury), and contents of free alkali were measured. All soaps had a slightly alkaline pH of 7.9 to 11.2, average drying loss was 17.6%, and free alkali was hardly detected. The average values of all heavy metals were 0.104 ㎍/g for lead, 0.035 ㎍/g for arsenic, 0.002 ㎍/g for cadmium, 0.048 ㎍/g for antimony, and 0.0003 ㎍/g for mercury. The results of handmade soap were below the recommended in regulations on safety standards for cosmetics of Ministry of Food and Drug Safety.

• Journal of the Society of Cosmetic Scientists of Korea
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• v.39 no.2
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• pp.141-148
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• 2013

The harmful effects of ultraviolet (UV) radiation by increasing sun exposure are making people use sunscreens casually. To keep pace with this trend, many researches about mixing different ingredients or extracting effective ingredients from natural materials are conducted by cosmetics industry. In the present study, we evaluated the UV blocking effect of the sunscreen containing Scutellaria baicalensis Georgi extract. 10 volunteers were measured by minimal erythema dose (MED) and sun protection factor (SPF) of each product. The SPF results were $34.52{\pm}2.13$ and $32.67{\pm}1.44$ in the sunscreen containing Scutellaria baicalensis Georgi extract and that of not containing the substance, respectively. Although the difference of SPF between two products was statistically not significant, it is thought to be meaningful in evaluating clinical effects of the sunscreen using natural substance to humans without any adverse reaction.

• Korean Journal of Agricultural Science
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• v.41 no.4
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• pp.369-377
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• 2014

This study was carried out to evaluate the effect of rice husk (RHB) and food waste biochar (FWB) on upland soil with sandy loam texture, in terms of physico-chemical analysis, lettuce seed germination test, and orgainc carbon leaching experiment. RHB and FWB had different physico-chemical properties each other. Carbon to nitrogen ratio (C/N ratio) of RHB was 32, showing two times higher than that of FWB. FWB had high salt and heavy metal content, compared to RHB. This is probably due to different ingredients and production processing between two biochars each other. Results of germination test with Lettuce showed lower germination rate when FWB was applied because of higher salt concentration compared to control and RHB. Organic carbon leaching test using saturated soil column (${\Phi}75{\times}h75mm$) with $10MT\;ha^{-1}$ biochar application rate, showed higher saturated hydraulic conductivity in rice husk biochar treatment column, compared to control and food waste biochar treatment. The highest total organic carbon concentration in column effluent was lower than those in both of rice husk biochar and food waste biochar, whereas the differences was negligible after 9 pore volumes of effluent. Consequently, biochars from byproducts such as rice husk and food waste in sandy loam textured upland soil could enhance a buffer function such as reduction of leaching from soil, but the harmful ingredient to crops such as high salt and heavy metals could limit the agricultural use of biochars.

• Korean Journal of Health Education and Promotion
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• v.24 no.4
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• pp.181-200
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• 2007

Objectives: A content analysis was conducted to examine whether the current school textbooks providing smoking information are effective or not. Methods: The authors reviewed 111 qualified textbooks using elementary through high schools during 2006-2007 academic year in Korea. Educational components were coded with an analysis tool developed through the present research. Result: Tobacco education components were narrowly focused on long-term physiological consequences of tobacco use, addictiveness, and harmful ingredients and they were repetitively shown in the textbooks. Negative health consequences such as lung cancer were emphasized 10 times among 12 smoking-related textbooks. Educational messages or contents are mainly based on medical knowledge (72%) rather than psycho-social components. The US school-based smoking prevention programs, however, employ psycho-social approach with cognitive and life-skill components and they contain only 7-17% of smoking-related medical knowledge. In order to increase psycho-social smoking prevention components in Korean textbooks, the present study identified social subjects of textbooks (and relating core sessions) for elementary, middle, and high school. It also provided guidelines for school instructors to use. Conclusion: Adolescent smoking behavior is not caused by the deficit of health information, but mostly by social influences including media and peer pressure. School textbooks proving smoking information need to increase psycho-social context. One of the most effective ways as a psycho-social smoking prevention program is to use social subjects (or curriculum) of textbooks such as social studies, ethics, social cultures, social environment, and home management.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.14 no.5
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• pp.2063-2068
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• 2013

Ship and offshore structures, those are to be used under the seawater conditions are prone to corrosion. In this research, the effect of rust existence on the fatigue strength at structural member of ship and offshore structure was investigated. For this purpose, fatigue tests for the rust removed specimen were conducted. In addition, the comparison of fatigue strength between rust removed specimen and rusted specimen was conducted. With these test results, fatigue strength share effect was investigated. Finally, at this research, it was found that there is fatigue strength share effect on the rust. In comparison of fatigue strength reduction factor, fatigue strength of the rust removed specimen is 18.1% lower than that of the rusted specimen. From the above, it was known that as far as there are not any harmful ingredients in it, rust on the steel plate is beneficial in an aspect of fatigue strength.