title: Effects of pHs on properties of bio-nanocomposite based on tilapia skin gelatin and Cloisite Na+.
abstract: Effects of various pHs (4-8) of film forming suspensions (FFS) on the properties of nanocomposite film based on tilapia skin gelatin and hydrophilic nanoclay (Cloisite Na(+)) were investigated. Intercalated/exfoliated structure of nanocomposite films was revealed by WAXD analysis. Young's Modulus (YM) and tensile strength (TS) of nanocomposite films increased up to pH 6 (P<0.05). Nevertheless, the further increases in pH levels resulted in the decreases in both YM and TS (P<0.05). The highest water vapour barrier property of the film was observed when the pH of FFS was 6 (P<0.05). Lightness (L*) and yellowness (b*) of nanocomposite films generally increased with increasing pH levels. Transparency of nanocomposite films was affected to some extent by pHs. Homogeneity and smoothness of film surface were obtained for nanocomposite films with pH 6 as confirmed by SEM micrographs. Thermogravimetric (TGA) and differential scanning calorimetric (DSC) analyses indicated that thermal stability of nanocomposite films varied with different pH levels. In general, mechanical and water vapour barrier properties of nanocomposite films were improved when FFS having pH 6 was used. Thus, the pH of FFS directly affected the properties of nanocomposite gelatin films incorporated with hydrophilic nanoclay.
authors: Department of Food Technology, Faculty of Agro-Industry, Prince of Songkla University, Hat Yai, Songkhla 90112, Thailand.
authors: Muralidharan
authors: M
authors: Nagarajan
authors: Department of Food Technology, Faculty of Agro-Industry, Prince of Songkla University, Hat Yai, Songkhla 90112, Thailand. Electronic address: soottawat.b@psu.ac.th.
authors: Soottawat
authors: S
authors: Benjakul
authors: Department of Material Product Technology, Faculty of Agro-Industry, Prince of Songkla University, Hat Yai, Songkhla 90112, Thailand.
authors: Thummanoon
authors: T
authors: Prodpran
authors: Department of Material Product Technology, Faculty of Agro-Industry, Prince of Songkla University, Hat Yai, Songkhla 90112, Thailand.
authors: Ponusa
authors: P
authors: Songtipya
mesh_terms: D000538:Aluminum Silicates / Q000737:chemistry*; D000818:Animals; D001672:Biocompatible Materials / Q000737:chemistry*; D002152:Calorimetry, Differential Scanning; D000077215:Clay; D003116:Color; D055119:Elastic Modulus; D005780:Gelatin / Q000737:chemistry* / Q000494:pharmacology; D006863:Hydrogen-Ion Concentration; D053761:Nanocomposites / Q000737:chemistry* / Q000648:ultrastructure; D010539:Permeability; D012867:Skin / Q000737:chemistry*; D012964:Sodium / Q000737:chemistry*; D012996:Solutions; D055672:Static Electricity; D013227:Steam; D013696:Temperature; D013718:Tensile Strength; D013818:Thermogravimetry; D017210:Tilapia; D014961:X-Ray Diffraction
chemical_list: D000538:Aluminum Silicates; D001672:Biocompatible Materials; D012996:Solutions; D013227:Steam; C015233:gelatin film; D005780:Gelatin; D012964:Sodium; D000077215:Clay
keywords: Gelatin; Mechanical properties; Microstructure; Nanoclay; WAXD; pH