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The Korean Society for Biotechnology and Bioengineering (한국생물공학회)
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Preparation and Characterization of PEG-impregnated Aloe Gel through DIS Processing of Aloe vera Leaf Slice

DIS 공정에 의한 Polyethylene Glycol 함침 알로에 베라 겔의 제조 및 특성화

  • Kwon, Hye Mi (Department of Bioengineering and Technology, Kangwon National University) ;
  • Hur, Won (Department of Bioengineering and Technology, Kangwon National University) ;
  • Lee, Shin Young (Department of Bioengineering and Technology, Kangwon National University)
  • 권혜미 (강원대학교 생물공학과) ;
  • 허원 (강원대학교 생물공학과) ;
  • 이신영 (강원대학교 생물공학과)
  • Received : 2013.08.12
  • Accepted : 2013.10.23
  • Published : 2013.12.30
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Abstract

The novel Aloe gels were prepared with dewatering and impregnation by soaking (DIS) processing of Aloe vera leaf slice at four different temperatures (25, 35, 45 and $55^{\circ}C$), using dehydration solution of 40% (w/v) polyethylene glycol (PEG4000). The PEG-impregnation to Aloe vera leaf slice during DIS was observed depending on immersion temperature, and the PEG-impregnated Aloe vera gel (PEG-i-AVG) obtained was characterized using $^1H$ NMR, FT-IR, GPC, XRD and TGA. The PEG-i-AVG had the higher levels of Aloe bioactives (glucomannan and O-acetyl contents) and better quality indices by $^1H$ NMR and FT-IR spectroscopy than those of native Aloe gel. Also, the obtained Aloe gel maintained the bimodal patterns in higher molecular weight region by GPC indicating no degradation of polysaccharide from native Aloe gel. The result observed by SEM confirmed a surface modification by forming the porous structure, and TGA result exhibited better thermal stability than that of native Aloe gel. XRD result revealed that the crystalline structure in Aloe gel was led by incorporation of PEG. Significant decrease of %insolubility and high enhancement of water solubility index were observed, respectively, and highly ordered conformation such as a helix structure was also indicated by Congo red reaction. We concluded that the modification effect for enhancing function of native Aloe gel was successfully obtained by DIS process using PEG as a dehydrating agent. These results suggested that this DIS process had a high potential for developing a new minimally processed product from Aloe vera leaf.

Keywords

References

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