Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Rheological and Textural Properties of High Oil Content O/W Emulsions Depending on Surfactant Types

계면활성제 종류에 따른 고함량 오일 함유 O/W 에멀젼의 유변학적 및 텍스처 특성

  • Sang Min Lee (Division of Chemistry and Cosmetics, Dongduk Women's University) ;
  • Byung Suk Jin (Division of Chemistry and Cosmetics, Dongduk Women's University)
  • 이상민 (동덕여자대학교 화학.화장품학부) ;
  • 진병석 (동덕여자대학교 화학.화장품학부)
  • Received : 2025.02.12
  • Accepted : 2025.03.07
  • Published : 2025.04.10
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Abstract

High oil content O/W emulsions, with oil as the dispersed phase, were prepared by varying the types of surfactants and the oil content. The rheological and textural properties of each formulation were then compared. The dispersion phases of polyhedral structures formed in a high internal phase O/W emulsion with an oil content of 70 wt% were observed using confocal fluorescence microscopy. Additionally, phase inversion was observed when continuous shear force was applied to the high internal phase emulsion. The Herschel-Bulkley model equation was applied to the shear stress vs. shear rate curves for each formulation to calculate the shear thinning index and yield stress values. Based on the viscosity and texture measurement results, the high oil content O/W emulsions with sucrose-based surfactants exhibited the highest viscosity, hardness, and adhesiveness, while the emulsions with sorbitan-based surfactants showed the highest creaminess.

고함량의 오일이 분산상으로 존재하는 O/W 에멀젼을 계면활성제 종류 및 오일의 함량을 달리하여 제조하면서 각 제형들의 유변학적, 텍스처 특성을 비교하였다. 오일 함량 70 wt%의 고내상 O/W 에멀전에서 형성된 다면체 구조의 분산상을 공초점 형광 현미경을 사용하여 관찰하였다. 또한 고내상 에멀젼에 전단력을 지속적으로 가하면 상이 반전되는 현상을 관찰하였다. 각 제형별 전단속도에 따른 전단력 변화 곡선에 Herschel-Bulkley 모델식을 적용하여 shear thinning index와 항복응력 값을 산출하였다. 점도와 텍스처 측정 결과, 수크로스 계열 계면활성제의 O/W 에멀젼은 가장 높은 점도, 경도와 부착성을 보인 반면, 솔비탄 계열 계면활성제의 에멀젼은 가장 높은 크림성을 나타냈다.

Keywords

Acknowledgement

본 연구는 산업통상자원부의 바이오산업 기술개발사업(과제번호 20018375)의 지원에 의하여 수행된 결과의 일부이며 이에 감사의 뜻을 표합니다.

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