Search

Selected physicochemical properties of native and modified water chestnut starch (Trapabispinosa) were studied. Single- and dual-modifications were carried out by pregelatinization, acetylation and acid-thinning methods. Chemical modification created unevenness on the surface of starch granule. Swelling power, solubility, and water retention capacity were improved by all modification techniques used. The peak viscosity was reduced in all modified starches as compared to native water chestnut starch. The setback value which is an indication of retrogradation (re-association of starch molecules) tendency in the starch paste was reduced after pregelatinization and acid-thinning but increased by acetylation.

The Conservation Section at the Division for Cultural Properties (DCP) works primarily with thangka (painted scrolls) and wall paintings maintained at working religious sites in Bhutan. This research seeks to identify and evaluate sustainable and appropriate methods and supplies for the conservation of material culture in a dynamic ritual context. This project develops techniques and practices that prioritise locally available materials, studies religious space as a unique environment for preservation and maintenance, and documents a collaboration between local and imported conservation knowledge. This work includes an experimental evaluation of adhesive made from locally available wheat and potato starch, the development of a method for refining coarse hide glue to be used as a conservation material, and the use of soapnut (Sapindus spp.) for cleaning textiles. Initial results for materials and methods are presented here in consideration of their availability, efficiency, ease of use and performa...

The objectives of this work were to determine the gelatinization temperature of jackfruit starch and to compare the effect of pH on the viscosity and density of different botanical sources of starch pastes. The study was conducted according to a three × four factorial design with three repetitions, being three levels for the starch paste (jackfruit seed, corn and cassava) and four levels for pH (3.4; 4.4; 5.4 and 7.0). The results showed a gelatinization temperature (GT) of jackfruit seed starch ranging from 75 to 80 °C, superior to GT range of common starch sources. Density of all starch pastes increased with pH. The effect of the kind of starch was not significant (P > 0.05). Viscosity of corn and cassava starch pastes varied with pH according to quadratic models. The viscosity of seed starch paste from jackfruit did not significantly vary with pH, indicating acid resistance.

Two methods are described for storing starch paste adhesive that allow it tobe kept mold-free for up to six months at room temperature without fungicidal additives. The preferred method, using sterile syringes, has the further advantage that small quantities of starch paste can be used without opening the container and risking contamination with microorganisms. Paste stored in a syringe for eight weeks is smooth, free of lumps, and ideal for use when extruded from the syringe. An alternative method for inhibiting fungal growth in paste pots without the use of chemical fungicides involves exposing the starch paste to ultraviolet light. The gelatinization process of starch as it relates to paste preparation and storage is discussed, as is the microwave oven method of preparing starch paste.

(1988). A STUDY OF THE PROPERTIES OF AGED STARCH PASTE (FURU-NORI) Studies in Conservation: Vol. 33, Kyoto Congress Preprints: The Conservation of Far Eastern Art, pp. 5-10.

1 THE PROBLEM 1.1 Description of the textile A regimental silk banner, measuring 90cm x 125cm, handmade in December 1814,was to be prepared for exhibit (Fig. 1).. The banner was composed of a silk ground*, ornately decorated with many colors of silk embroidery. Ribbon decoration was painted with a blue pigment. Lettering was applied in gold leaf onto the painted areas. A 7.5cm twisted fringe was sewn to three-edges. The flag was finished on both sides.

Corn Starch USP consists of the two glucose polymers, amylose and amylopectin, whose normal ratio is 27%:73%. This study was initiated to determine whether a variation in this ratio would have any benefit in pharmaceutical granulations. Starch pastes prepared by varying the amylose/amylopectin ratio were used to granulate a dicalcium phosphate system and the resulting tablet properties were evaluated.Physical mixtures of the polymers and also special hybrid polymer mixtures were studied. Binding and disintegrant properties of the starch fractions do vary with the amylose/ amyloptectin ratio and with the degree of starch hydrolysis during the heating (cooking) phase of starch paste preparation. The results of this study give some indication as to the binding and disintegrant activity of starch and its fractions.

Two studies on the effects of paper conservation treatments. Study I: The effect of various adhesives used in paper conservation on the stability of water colors and inks. Testing was done on both sized and unsized papers, using methyl cellulose, carboxy-methyl cellulose, rice starch paste, PVA and acrylic resins. Carboxy-methyl cellulose proved to be the most satisfactory adhesive tested, being both workable and safe for use with inks tested. Study 2: The effects of various methods of dry cleaning on paper were studied using scanning electron microscopy. All papers showed residual particles of eraser after treatment.

(1923). XXIII.—THE FLOW OF STARCH PASTE THROUGH CAPILLARY TUBES. Journal of the Textile Institute Transactions: Vol. 14, No. 11, pp. T414-T440.