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Effects of a Chitosan Coating on Properties of Retinol- Encapsulated Zein Nanoparticles
박찬은,박동준,김범근 한국식품과학회 2015 Food Science and Biotechnology Vol.24 No.5
Zein nanoparticles coated with chitosan were prepared for encapsulation of retinol. The mean particle size of retinol-loaded zein nanoparticles was approximately 300 nm. After coating with chiotsan, the mean particle size increased to >500 nm. The zeta potential of retinol-loaded zein nanoparticles was approximately -30 mV, which was changed to >+24mV after chitosan coating. The encapsulation efficiency of zein nanoparticles increased from 64.9% to >80% after chitosan coating. The release profile was greatly improved with a chitosan coating, and a slow release rate was observed. FTIR analysis of retinol-loaded chitosan-coated zein nanoaprticles showed cross-linking between zein and retinol through electrostatic interactions. Photochemical stability against UV light was greatly improved to >90% after encapsulation. The concentration of chitosan, the Mw of chitosan, and the zein/chitosan volume ratio were important parameters affecting the properties of nanoparticles.
우정관계 질투가 관계적 공격성에 미치는 영향에서 귀인성향과 자기효능감의 조절효과
박찬은,김도연 한국심리학회산하학교심리학회 2017 한국심리학회지 학교 Vol.14 No.1
이 연구는 초등학교 6학년을 대상으로 우정관계 질투가 관계적 공격성으로 이어지는 과정에서 내부귀인, 외부귀인 그리고 자기효능감의 조절효과를 살펴보고자 실시하였다. 연구대상은 서울과 경기도의 초등학교 6학년에 재학 중인 학생 570명으로 측정도구는 우정관계 질투척도, 또래갈등 척도, 귀인성향 척도, 자기효능감 척도로 설문조사를 시행하였다. 이 연구의 주요결과는 다음과 같다. 첫째, 우정관계 질투는 관계적 공격성과 정적 상관이 나타났다. 둘째, 중다회기분석을 통하여 조절효과를 검증한 결과 외부귀인과 자기효능감이 우정관계 질투와 관계적 공격성간의 관계에서 조절효과를 나타냈다. 상호작용효과를 분석했을 때 외부귀인이 높은 사람은 우정관계 질투가 높을수록 관계적 공격성이 높은 것으로 나타났다. 또한 자기효능감의 경우에는 자기효능감의 각 수준에 따라 차이가 있는 것으로 나타나 자기효능감이 높은 사람이 우정관계 질투가 낮아질 때 관계적 공격성이 감소하는 것으로 나타났다. 마지막으로 이 연구의 제한점과 의의에 대하여 논의하였다. The present study examined the effects of friendship jealousy on relational aggression of early adolescents and addressed the question as to whether locus of control and self-efficacy had any moderating effect upon the relationship between friendship jealousy and relational aggression. The participants of this study consisted 570 students(6th grade, 276 boys & 294 girls) from elementary schools located in Seoul and Gyeounggi province. It was measured with Friendship Jealousy Questionnaire(Parker & Low, 1999), Locus of Control Scales (Levenson, 1981), Self-Efficacy Scales(Cha, J. E., Kim, A. Y., 1996). The Peer Conflict Scale(Marsee, Komonis, & Frick, 2004) was used to measure the level of relational aggression. Statistical analyses of data used for this study comprised the following methods; frequency, mean, standard deviation, and hierarchical regression. The results indicated that the level of friendship jealousy and external locus of control of elemantary school students increased the level of relational aggression whereas the level of self-efficacy decreased the level of relational aggression. In addition, external locus of control and self-efficacy moderated the effects of friendship jealousy on relational aggression whereas internal locus of control did not.