Characterization of Modified Tapioca Starch in Atmospheric Argon Plasma under Diverse Humidity by FTIR Spectroscopy

Abstract

Tapioca is economical crop grown in Thailand and continues to be one of the major sources of starch. Nowadays, tapioca starch has been widely used in industrial applications, however the native form of starch has limited the applications. Thus scientists try to modify the properties of starch for increasing the stability of the granules, pastes to low pH, heat, and shear during the food process. We modify the tapioca starch by plasma treatment under an argon atmosphere. The degree of modification is determined by following water content in the starch granules. The tablet samples of native starch are also prepared and compared with the plasma treated starch. Before plasma treatment, the starch tablets are stored under three different relative humilities (RH) including 11%, 68%, and 78%RH, respectively. The samples are characterized using FTIR spectroscopy associated with the degree of cross-linking. The results show that the water molecules are engulfed into the starch structure in two ways, a tight bond and a weak absorption of water molecules which is represented at two wave number of 1630 cm −1 and 3272 cm −1 , respectively. The degree of cross-linking can be identified from the relative intensity of these two peaks with the C-O-H peak at 993 cm −1 . The results show that the degree of cross-linking increase in the plasma treated starch. The degree of cross-linking of the treated starch with high relative humidity is less than that of the treated starch with low relative humidity.

Effect of sodium chloride on the glass transition of condensed starch systems

“…Finally, the relatively broad infrared band at 1630 cm À1 is associated with the vibrations of tightly bound water molecules absorbed in the amorphous regions of starch (Deeyai et al, 2013;Kizil, Irudayaraj, & Seetharaman, 2002). This molecular event is evident in Fig.…”

“…The overlapping bands between 1000 and 1082 cm À1 are assigned progressively to C-O-H bending and C-O, C-C and O-H stretching. The absorbance band at 1158 cm À1 is associated with C-O-C asymmetric stretching of glycosidic bonds (Deeyai, Suphantharika, Wongsagonsup, & Dangtip, 2013). The technique has been used to identify the structural morphology of starch, with bands around 1022 cm À1 being related to amorphous domains (Capron, Robert, Colonna, Brogly, & Planchot, 2007;Sevenou, Hill, Farhat, & Mitchell, 2002).…”

Physicochemical properties, modifications and applications of starches from different botanical sources

“…High pressure generally restricts the swelling capacity and consequently decreases paste viscosity. Dther technologies use pressure several times bellow atmospheric pressure (vacuum pressures); this technology uses gas in a plasma state and is the most recent technology used for starch granule modification (Deeyai et al, 2013;Wongsagonsup et al, 2014). Plasma is an ionized gas composed of several types of active ionic species: electrons, ions, excited atoms and protons (Bogaerts et al, 2002).…”

Influence of atmospheric pressure plasma jet on the structure of microcrystalline starch with different relative crystallinity

“…Deeyai et al . () and Thirumdas et al . () also found that plasma treatment broadened absorption peak of O–H groups.…”

“…The peak height at 3314 cm À1 was slightly increased after APPJ treatment. Deeyai et al (2013) and Thirumdas et al (2017b) also found that plasma treatment broadened absorption peak of O-H groups. This may be due to the incorporation of O-H groups by cleaving C-O-C glycosidic bonds during plasma treatment (Thirumdas et al, 2017a).…”