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조선아(Sun-A Cho),유병승(Byoungseung Yoo) 한국식품과학회 2008 한국식품과학회지 Vol.40 No.2
농도(0, 10, 20, 30%, w/w)를 달리한 sucrose가 혼합된 고구마 전분 페이스트(5% w/w)의 정상유동 특성과 동적 점탄특성에 미치는 영향에 대하여 평가하였다. 고구마전분-sucrose 복합물의 정상유동 특성은 power law 모델 및 Casson 모델로부터 레올로지 계수를 결정하였다. 일정한 온도(25℃)에서 모든 시료들은 높은 항복응력과 함께 pseudoplastic과 thixotropic 거동을 나타내었다. 고구마전분-sucrose 복합물의 점조도 지수(K), 겉보기 점도(η<SUB>a</SUB>), 그리고 항복응력(σ<SUB>oc</SUB>) 값들은 control(0% sucrose)에 비해 10% sucrose가 더 높았으며, 또한 sucrose 농도(10-30%)가 증가함에 따라 이들 값들은 감소하였다. 팽윤력은 30% 농도에서 급격한 감소를 나타내었고, 레올로지 계수(K, η<SUB>a</SUB>, σ<SUB>oc</SUB>)값이 낮게 나타난 시료는 낮은 팽윤력을 보여주었다. 온도 의존성은 25-70℃ 온도 범위에서 Arrhenius 관계식에 의하여 높은 상관관계를 나타내었다. 또한 동적 점탄특성 측정 결과에 의하면 고구마전분-sucrose 복합물은 약한 젤과 같은 거동을 보여주었으며, G′과 G″ 값들은 sucrose 농도와 진동수(ω)가 증가함에 따라 증가하는 경향을 보였다. Cox-Merz 중첩원리는 30% sucrose 농도를 가진 고구마전분-sucrose 복합물에서 잘 적용되는 것으로 나타났다. 따라서 sucrose 첨가에 의해 고구마전분 페이스트의 레올로지 특성이 변화하게 되며, 이들 특성은 sucrose의 농도에 의해 크게 영향을 받는 것으로 나타났다. Effects of sucrose at different concentrations (0, 10, 20, and 30%, w/w) on steady and dynamic shear rheological properties of sweet potato starch (SPS) paste (5%, w/w) were investigated. The steady shear rheological properties of SPS-sucrose composites were determined from rheological parameters based on power law and Casson flow models. At 25℃ all the samples showed pseudoplastic and thixoropic behavior with high yield stress. Consistence index (K), apparent viscosity (η<SUB>a,100</SUB>), and yield stress (σ<SUB>oc</SUB>) values of SPS-sucrose composites decreased with increasing sucrose concentration from 10% to 30%. The decrease of swelling power was observed at higher sucrose concentration (>20%) and the low swelling power yielded a lower K, η<SUB>a,100</SUB>, and σ<SUB>oc</SUB> values. In temperature range of 25-70℃, Arrhenius equation adequately assessed variation with temperature. Oscillatory test data showed weak gel-like behavior. Magnitudes of storage (G′) and loss (G″) moduli increased with an increase in sucrose concentration and frequency. The SPS-sucrose composite at 30% concentration closely followed the Cox-Merz superposition rule.
치약 및 함유 성분의 구강 점막 자극 평가를 위한 새로운 in Vitro 시험법 적용
조선아 ( Sun-a Cho ),김유진 ( Yoo-jin Kim ),김찬호 ( Chan-ho Kim ),김영소 ( Young-so Kim ),안수선 ( Su-sun An ) 한국동물실험대체법학회 2019 동물실험대체법학회지 Vol.13 No.1
Oral hygiene products, such as toothpastes, are essential for personal hygiene. However, these products contain substances that cause mucosal irritation but are essential to maintain functionality. Until now, there is no in vitro animal test to evaluate oral mucosal irritation for oral hygiene products and its ingredients. Moreover, oral hygiene products are classified as cosmetics in EU, thus the irritation test for these products and its ingredients are prohibited. In Korea, oral products are classified as quasi-drugs now, but there is a high possibility to change to cosmetics according to global trends. So we needed to set up the in vitro test system to evaluate oral mucosal irritation and we studied the oral mucosal irritation for toothpaste and its ingredients by agar diffusion test. In the evaluation of ingredients, the use of surfactant, tooth whitening ingredient and some functional ingredients affect the increase of cytotoxicity. In addition, when diluted to 25%, the toothpastes showed the broad range of irritation and it was appropriate to judge the level of irritation. From the results, we can set the evaluating method for toothpaste and its ingredients and internal criteria for the mucosal irritation at same time.
연구논문 : 양이온 계면활성제의 구조적 특성에 따른 안자극 변화
조선아 ( Sun A Cho ),배우리 ( Woo Ri Bae ),이은영 ( Eun Young Lee ),신계호 ( Kye Ho Shin ),강병하 ( Byung Ha Kang ),이존환 ( John Hwan Lee ),이태룡 ( Tae Ryong Lee ),조준철 ( Jun Cheol Cho ),안수선 ( Su Sun An ) 한국동물실험대체법학회 2011 동물실험대체법학회지 Vol.5 No.1
Although cationic surfactants can cause eye irritation at high concentration, it has some merits in hair conditioning function and has been commonly used in hair conditioning product as a main component. For these reasons, the selection and use of milder cationic surfactant is important in safety of cosmetics. With the use of the hen`s egg test-chorioallantoic membrane (HET-CAM) assay, we examined the eye irritation potential for several cationic surfactant according to chemical structure properties. The eye irritation potential of cationic surfactant was increased according to increasing number of alkyl chain, alkyl chain length. And the cationic surfactant that neutralized to methosulfate causes lower irritation than cationic surfactant of chloride. From these results, we can determine the eye irritation potentials of cationic surfactant according to chemical structure.
HET-CAM법을 이용한 화장품 원료와 제품의 안자극 가능성 평가
조선아 ( Sun A Cho ),안수선 ( Su Sun An ),김한곤 ( Han Kon Kim ),이태룡 ( Tae Ryong Lee ) 한국동물실험대체법학회 2008 동물실험대체법학회지 Vol.2 No.2
The hen`s egg test-chorioallantoic membrane (HET-CAM) assay has been used as an alternative method to Draize rabbit eye irritation test. We have established an internal safety guideline for determination of eye irritation potential of cosmetics and cosmetic ingredients when using HET-CAM assay as an alternative method to Draize rabbit eye irritation test; Potential cosmetic ingredients with [S] score above 6 at concentrations of use are not permitted as cosmetic ingredients and eye cosmetics with [S] score above 12 are not allowed in internal safety guideline. Following this guideline, we examined the eye irritation potential for several potential cosmetic ingredients and, as results we could exclude the use of some natural pigments that show the eye irritation.
DNCB 유발 피부염 생쥐에서 보스웰리아가 피부조직 모발주기 관련 유전자에 미치는 영향
조선아 ( Sun A Cho ),류은미 ( Eun Mi Ryu ) 대한미용학회 2021 대한미용학회지 Vol.17 No.1
The fact that the skin and scalp are always exposed to external environment makes them easily susceptible to inflammatory problem caused by various chemicals or physical stimuli. In this context, the current study examined how Boswellia affects the hair cycle of inflammatory skin or scalp caused by DNCB (2,4-dinitrochlorobenzene) in mice. For the study, 5 week-old male Balb/c mice were selected and DNCB was used to cause contact dermatitis in the mice’s skin at the back. Next, Boswellia was administered and all visual changes in the skin were followed. Furthermore, histological analysis and transcription through hematoxylin & eosin dyeing method were done to understand Boswell's mechanism of action toward atopic dermatitis. The symptoms of dermatitis visually appeared to be significantly improved on Boswellia administration. Histological analysis showed the keratin layer in the DNCB-B group and the shape of a hair follicle as round. Analysis of transcriptionome revealed an increase in gene Gprc5d, Msx2, Ptch2, Wnt10b, Dsg4, Kratap4-16, Hc16, Apcdox and S21 mR in the DNCB-B group compared to the positive control DNCB group. In conclusion, Boswellia administration was found to help improve the symptoms of DNCB dermatitis, and the changes in hair-related gene expression might improve the hair cycle or growth impediments caused by dermatitis.
조선아 ( Sun A Cho ),배우리 ( Woo Ri Bae ),이은영 ( Eun Young Lee ),신계호 ( Kye Ho Shin ),강병하 ( Byung Ha Kang ),이존환 ( John Hwan Lee ),이태룡 ( Tae Ryong Lee ),조준철 ( Jun Cheol Cho ),안수선 ( Su Sun An ) 한국동물실험대체법학회 2011 동물실험대체법학회지 Vol.5 No.1
Although cationic surfactants can cause eye irritation at high concentration, it has some merits in hair conditioning function and has been commonly used in hair conditioning product as a main component. For these reasons, the selection and use of milder cationic surfactant is important in safety of cosmetics. With the use of the hen`s egg test-chorioallantoic membrane (HET-CAM) assay, we examined the eye irritation potential for several cationic surfactant according to chemical structure properties. The eye irritation potential of cationic surfactant was increased according to increasing number of alkyl chain, alkyl chain length. And the cationic surfactant that neutralized to methosulfate causes lower irritation than cationic surfactant of chloride. From these results, we can determine the eye irritation potentials of cationic surfactant according to chemical structure.
연구논문 : HET-CAM법의 modification을 통한 휘발성 원료 및 제품의 새로운 평가 방법
조선아 ( Sun A Cho ),김종협 ( Jong Hyub Kim ),이태룡 ( Tae Ryong Lee ),신계호 ( Kye Ho Shin ),김한곤 ( Han Kon Kim ),안수선 ( Su Sun An ) 한국동물실험대체법학회 2010 동물실험대체법학회지 Vol.4 No.2
Although ammonia can cause eye irritation such as lacrimation, periobital edema and conjunctivitis at high concentration, it has some merits in hair dying function and has been commonly used in hair dye product. However, there are no proper alternative methods for evaluation of the eye irritation potential of volatile material such as ammonia. We have established a new method for determination of eye irritation potential of volatile materials and formulations containing volatile materials by modification of HET-CAM (Hen`s egg test- chorioallantoic membrane) assay. While original HET-CAM assay cannot determine the eye irritation potentials of hair dyes that contain ammonia, modified method can determine the eye irritation potentials of hair dyes that contain ammonia. These results suggest that the modified HET-CAM assay is useful to evaluate the eye irritation potential of volatile materials.
de novo 특발성 파킨슨병 환자의 호흡 및 발성 특성
조선아(Cho Sun-A),손영호(Sohn Young Ho),백승재(Baek Seungjae),이필휴(Lee Phil Hyu),이지은(Lee Ji Eun),최예린(Choi Yaelin) 한국음성학회 2010 말소리와 음성과학 Vol.2 No.4
Many previous studies based on respiratory characteristics of Idiopathic Parkinson’ Diseases (IPD) patients have not controlled related factors appropriately. Accordingly, these studies produced discordant results. Furthermore, there is currently a lack of studies that can provide precise explanations on the characteristics of respiration and phonation. This study included a total of 40 subjects: 20 mixed gender de novo IPD patients ranging in age from 50 to 80 (Hoehn & Yahr stage 1~3), and 20 normal subjects with similar matches for age and gender. All participants were controlled based on their gender, age, height, weight, vocal fold function, cognitive abilities, and depression factors. K-MMSE (Korean-Mini Mental State Examination), nVHI-10 (new Voice Handicap Index), and KGDS (Korean Form of Geriatric Depression Scale) were evaluated to select this study subjects. In order to compare respiratory functions between the two groups, FVC, FEV1, and FEV1/FVC were measured using microQuark, a PC-based spirometer. CSL was used by measure MPT and PAS was used to measure MFR. To investigate the characteristics of phonation ability, CSL was used to measure jitter and shimmer, while PAS was used to measure Psub. In order to compare the respiratory function averages and phonation ability between the two groups, statistical analysis was conducted using SPSS (version 12.0). The results of this study showed that most de novo IPD patients were included in the normal average range of respiratory and phonatory ability. But the respiratory and phonatory ability of de novo IPD patients showed lower tendency as compared with the normal group. When the average of respiratory and phonatory ability among the gender was compared, the difference of males was greater than the difference of females.