A heat-stable alpha amylase with superior thermal stability and wide pH range, suitable for desizing of textile fabrics such as cotton, silk, polyvinyl alcohol fibers, rayon fibers, blended fabrics, dyed poplin, etc.
Heat-stable Alpha-Amylase TH-0400 is produced from selected strains of Bacillus licheniformis through submerged fermentation, extraction and refining process. It is an endoamylase that can efficiently decrease viscosity of gelatinous starch solutions by randomly hydrolyzing starch, glycogen and its degradation products within the alpha-D-1 glycosidic bonds and produce soluble dextrins and oligosaccharides under high temperature and low pH conditions.
TH-0400 has an excellent heat resistance and a wide pH range. It is suitable for desizing of textile fabrics such as cotton, silk, polyvinyl alcohol fibers, rayon fibers, blended fabrics, dyed poplin, etc.
EFFECT OF PH TH-0400 is active over a wide pH range, depending on the application conditions. The optimal pH is 5.4 to 6.4.
EFFECT OF TEMPERATURE Optimum temperature of TH-0400 for interval liquefaction is above 77°C. It liquefies starch substrates promptly at 83 to 90°C and demonstrates exceptional thermal stability at 100 °C. The exact temperature optimum depends on actual processing conditions, such as pH, concentration of substrate and time.
CONCENTRATION OF CALCIUM The presence of calcium increases the thermal stability of this enzyme. It requires a very low calcium concentration, i.e. 5 to 20 ppm will be sufficient to ensure its thermal stability.
INHIBITORS Copper, titanium, and cobalt ions are moderate inhibitors for TH-0400, whereas aluminum, lead and zinc ions act as strong inhibitors.
APPLICATION AND BENEFITS Use of TH-0400 in desizing of textiles can ensure the following benefits: 1) Enable desizing and colour-fixing at the same bath, thus shorten process flow and improve productivity 2) Enhanced capillary tube effect of fabrics 3) Improved working conditions for operators 4) Less dosage level and reduced processing costs