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Antioxidant and Antimelanogenic Effects of Stevia rebaudiana Flower Extract
소경섭,이성률,김성혁,하창우,박윤아,장소희,박종필,구현정,손은화 한국자원식물학회 2019 한국자원식물학회지 Vol.32 No.3
Stevia rebaudiana (Asteraceae), a perennial plant, has been used as a low-calorie sweetener and is being developed as a therapeutic agent for diabetes, hypertension, myocardial diseases, and microbial infections. Despite the common use of its leaves and stem, the bioavailability of the components present in S. rebaudiana flowers, when used as ingredients of cosmetics, has not been well investigated. Herein, we investigated the antioxidative and antimelanogenic effects of an aqueous extract of S. rebaudiana flowers (Stevia-F). Total flavonoid and phenolic content in Stevia-F were determined to be 8.64 ± 0.23 ㎎ of quercetin equivalents/100 g and 631.5 ± 2.01 ㎎ of gallic acid equivalents/100 g, respectively. The IC50 values of Stevia-F for reducing power, and 2,2-diphenyl-1-picryl-hydrazyl-hydrate radical, hydrogen peroxide, and nitric oxide scavenging activities were 5541.96, 131.39, 466.34, and 10.44 ㎍/mL, respectively. Stevia-F showed inhibitory effects on the tyrosinase (IC50 = 134.74 ㎍/mL) and α-glucosidase (IC50 = 114.81 ㎍/mL) activities. No significant cytotoxicity of Stevia-F was observed in B16F10 cells, treated with up to 100 ㎍/mL of the extract for 24 and 48 h (p > 0.05). Stevia-F (1–100 ㎍/mL) suppressed α-melanocyte stimulating hormone-induced melanin production in B16F10 cells (p < 0.05) and also inhibited the cellular tyrosinase activity (p < 0.05). Overall, our results show that Stevia-F possesses potential for inhibiting tyrosinase and α-glucosidase activities and has significant antioxidant capacity. The antimelanogenic potential of Stevia-F should extend the usage of S. rebaudiana flowers in the development of skinwhitening products.
소경섭,박윤아,구현정,김성혁,하창우,이상은,박종필,남궁승,김태형,손은화 한국약용작물학회 2018 한국약용작물학술대회 발표집 Vol.2018 No.10
Background : Stevia rebaudiana (Asteraceae), a perennial plant, has been used as a low caloric sweetener and therapeutic agent for diabetes, hypertension, myocardial, and antimicrobial infections. It has been commonly used leaves and stems because of their high anti-oxidative potential. The present research was carried out to explore anti-oxidative and anti-melanogenic effects of aqueous extract of Stevia rebaudiana Bertoni flos in B16F10 cells. Methods and Results : Anti-oxidant activity of Stevia flos extract (SFE) was determined by using 1,1-diphenyl-2-picryl hydrazyl (DPPH) radical scavenging assay, nitric oxide (NO) radical scavenging method, and reducing power method. The results showed that the total phenolic content of SFE was 63.154 ± 0.0002 ㎍·QE/100㎎ and the total flavonoid was 8.64 1 ± 0.002 ㎍·GAE/100㎎. SFE exhibited a big significant effect on NO radical scavenging activity (IC50: 179.6 ㎍/㎖) comparing with standard ascorbic acid (IC50: 368.6 ㎍/㎖), and showed concentration dependent DPPH radical scavenging activity (IC50: 131.8 ㎍/㎖). Anti-melanogenic effect of SFE was also examined with B16F10 melanocytes. The amount of melanin synthesis followed by α-melanocyte stimulating hormone on B16F10 cells were significantly reduced in the presence of SFE treatment (p < 0.05). SFE also suppressed the tyrosinase activity (p < 0.05) and α-glucosidase activity (p < 0.05). Conclusion : These results provide evidence Stevia rebaudiana flos has an antioxidant potency and can be used as an anti-melanogenic agent.
소경섭,성은주 대한가정의학회 2013 Korean Journal of Family Medicine Vol.34 No.1
Background: The prevalence of alcohol use disorder (AUD) is very high in Korea. To identify AUD in the busy practice setting, brevity of screening tools is very important. We derived the brief Alcohol Use Disorders Identification Test (AUDIT)and evaluated its performance as a brief screening test. Methods: One hundred male drinkers from Kangbuk Samsung Hospital primary care outpatient clinic and psychiatric ward for alcoholism treatment completed questionnaires including the AUDIT, cut down, annoyed, guilty, eye-opener (CAGE), and National Alcoholism Screening Test (NAST) from April to July, 2007. AUD (alcohol abuse and dependence),defined by a physician in accordance with Diagnostic and Statistical Manual of Mental Disorders-IV, was used as a diagnostic criteria. To derive the brief AUDIT, factor analysis was performed using the principal component extraction method with a varimax rotated solution. Receiver operating characteristic (ROC) curve analysis was performed to investigate the discrimination ability of the brief AUDIT. Areas under the ROC curve were compared performance of screening questionnaires with 95% confidence intervals. Results: The derived brief AUDIT consists of 4 items: frequency of heavy drinking (item 3), impaired control over drinking (item 4), increased salience of drinking (item 5), and alcohol-related injury (item 9). Brief AUDIT exhibited an AUD screening accuracy better than CAGE, and equally to that of NAST. Areas under the ROC curves were 0.87 (0.80–0.94), 0.76(0.66–0.85), and 0.81 (0.73–0.90) for the brief AUDIT, CAGE, and NAST for AUD, and 0.97 (0.95–0.99), 0.93 (0.88–0.98) and 0.93 (0.88–0.98) for alcohol dependence. Conclusion: The new brief AUDIT seems to be effective in detecting male AUD in the primary care setting in Korea. Further evaluation for women and different age groups is needed.
소경섭 한국콘텐츠학회 2019 한국콘텐츠학회논문지 Vol.19 No.12
The purpose of this study was to examine the effect of cyber bullying prevention education on university students. The subjects were 64 college students and were assigned to experimental group or Comparison group. The experimental group(n = 33) was educated about cyberbullying coping strategies, and the Comparison group(n = 31) was educated about general cyberbullying We used the Basic Emotions Scale, Helplessness Scale, and Competence Scale to confirm the efficacy of the education. Results, Both the experimental group and the Comparison group showed less negative emotions and helplessness after the education than before the education. In the experimental group, competence was significantly higher than the Comparison group. These results suggest that the inclusion of coping strategy is more effective in increasing competence than cyber bullying prevention education. Finally, the limitations of this study were discussed along with suggestions for further research. 본 연구에서는 대학생들을 대상으로 사이버 괴롭힘 예방 교육의 효과를 알아보고자 하였다. 연구는 대학생 64명을 대상으로 실시하였으며, 참가자들은 실험 집단 또는 비교 집단에 무선 할당되었다. 실험 집단(n = 33)은 사이버 괴롭힘 대처 전략을 포함한 예방 교육을 받았고, 비교 집단(n = 31)은 일반적인 사이버 괴롭힘에 대해 교육받았다. 교육의 효과를 확인하기 위해 기본정서 척도, 무력감 척도, 유능감 척도를 사용하였다. 연구 결과, 실험 집단과 비교 집단 모두 교육 전보다 교육 후에 기본정서에서의 부적정서와 무력감이 감소하였다. 비교 집단은 교육 전‧후 유능감에서 유의한 차이를 보이지 않았으나, 실험 집단은 교육을 받은 후 유능감이 유의하게 증가하였다. 다음의 결과는 사이버 괴롭힘 피해 예방 교육에 사이버 괴롭힘에 대한 정보를 제공하는 것 이상으로 대처 전략을 포함시키는 것이 유능감을 증가시키는데 효과적임을 시사한다. 마지막으로 본 연구의 의의와 제한점 후속 연구를 위한 제언을 논의하였다.
Some Properties of Projective Modules : 射影的 加群에 關한 性質
소경섭 원광대학교 사범대학 수학교육과 1986 시그마 Vol.3 No.-
연구하고자 하는 主定理들의 증명은 많은 학자들에 의하여 성취되었으나 (〔4〕,〔5〕,〔6〕), 특히 본고에서는 adjoint functor를 이용 可換環 A, B上에서 L;B上의 加群, M;A-B上의 加群, N;A上의 加群을 생각하며 同型定理 Hom_A(Lⓧ_BM, N)??Hom_B(L, Hom_A(M,N))을 고찰하고 이 결과를 이용하여 첫째, A→B:環準同型이라하고, 만약 B를 A상의 射影的 加群이라하면, 이때 임의의 B上의 射影的 加群은 A上의 射影的 加群이다.(定理2.4) 둘째, A를 局所環이라 할 때, A上의 有限生成射影的 加群과 A上의 有限生成自由加群과는 同値(定理 2.5)라는 主定理들을 증명하고저 한다.
Anti-oxidative and Anti-melanogenic Properties of Stevia rebaudiana Flos
Gyeong Seop So(소경섭),Yuna Park(박윤아),Hyun Jung Koo(구현정),Sung Hyeok Kim(김성혁),Chang Woo Ha(하창우),Sang Eun Lee(이상은),Jong Phil Bak(박종필),Seung Namkoong(남궁승),Tae Hyung Kim(김태형),Eun Hwa Sohn(손은화) 한국약용작물학회 2018 한국약용작물학회 학술대회논문집 Vol.2018 No.2