Surfactant behaviour of five carbohydrate liquid crystals

Abstract

The study of liquid crystalline behaviour of new amphiphilic carbohydrate derived liquid crystals has gained worldwide interest, since these glycolipids have technical and biological applications in a wide area such as thermotropic and lyotropic liquid crystals, surfactants, lubricants, solubilization and crystallization of membrane enzymes etc. Glycolipids are natural surfactants based on a hydrophilic sugar (carbohydrate) part and a hydrophobic hydrocarbon domain. In this paper, surfactant behaviour of five glycolipids is presented based on their critical micelle concentration (CMC). The nonionic surfactants treated with iodine, form donor-acceptor complexes in aqueous medium. Thus the CMC is determined by the spectral absorption and the shift in the absorbance maximum (λ max) of I 2 upon complex formation with surfactants. For a better comparison of results, turbidity measurements were exploited to determine the CMC. In accordance with the results of both methods, the CMC of all the acetylated compounds lie within the typical range for nonionic surfactants; 10-5-10-4 mol dm-3. Further, other fundamental parameters of surfactants, such as the HLB values and the cloud points of each compound were also studied.

Synthesis and Properties of Alkoxyethyl β‐d‐Xylopyranoside

“…The HLB of alkoxyethyl β‐ d‐ xylopyranosides ( 6a – 6f ) was calculated from Eq. using Griffin’s method (Abeyrathne, Perera, & Karunaratne, ). where X and A are the MS of the hydrophilic and lipophilic portion of the β‐ d‐ xylopyranoside ( 6a – 6f ), respectively.…”

“…The HLB of alkoxyethyl β-D-xylopyranosides (6a-6f) was calculated from Eq. 1 using Griffin's method (Abeyrathne, Perera, & Karunaratne, 2013).…”

Review in The Biological applications of glycolipids liquid crystals

“…[12] Besides, the synthetic glyclolipids are compatible to the environments, biodegradable and less fatal, so they are largely applied in many productions. [13]. In addition, glycolipids may illustration varied liquid crystalline behaviors built on the creation of diverse meso phases through several aspects such as varying temperature as well as concentration.…”