Effect of Eriochrome Black T on the gelatinization of xyloglucan investigated using rheological measurement and release behavior of Eriochrome Black T from xyloglucan gel matrices

SAXS and ATR-FTIR studies on EBT–TSX mixtures in their sol–gel phases

“…According to previous report [10], mixtures of aqueous solutions of 1% (w/v) TSX and EBT ( Fig. 1) existed as a sol or gel depending on the concentration of EBT.…”

“…Samples were prepared as previously described [10]. Briefly, a stock solution of TSX (2% (w/v)) was prepared by dispersing a required amount of TSX in distilled water.…”

“…Rheological experiments were performed as previously described [10]. In brief, a HAAKE RS-I rheometer, with a cone-plate sensor C20/1 • , coupled to a HAAKE DC 30/K 10 circulating system was used.…”

“…In addition, modified TSX has been mixed with other polymers, such as pectin and alginate, for a sustained delivery of drugs by the oral route [5]. Recently, natural TSX was found to form a gel when admixed with some small molecules, such as a sugar, alcohols [6], polyphenol [7], iodine [8], congo red [9] and eriochrome black T (EBT) [10].…”

“…Furthermore, the transition from sol to gel relied on time. According to the frequency sweep tests [10], the system of the aged mixture (24 h) at a concentration of 0.33% (w/v) EBT is a sol. For an aged mixture (24 h) of 0.65% (w/v) EBT, the system is balanced between the sol-gel transition where the storage modulus (G ) came close and almost overlapped with the loss modulus (G ).…”