THESIS

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milled rice (Juliano and Bechtel, 1985). Starch granules are relatively dense, insoluble, and swell only slightly in cold water. Rice starch has the smallest particle size and the whitest color of all the commercial starches. The average rice starch granule is between 2 - 8 microns in mature grain (Figure 2 A). These granules are polyhedral and constitute approximately 90% of milled rice (dry weight). Starch granules consist of alternating semi-crystalline and amorphous (Myer et al. 2001). However, rice contains only compound granules in amorphous rings. Dang and Copeland (2003) suggested that the growth rings in rice are approximately 400 nm apart. Based on scanning electron microscopy observations, one block-let in the semi-crystalline growth ring contains several amorphous and crystalline lamellae (Figure 2 B). Donald et al.(1997) reported that the cross striations within the growth rings of rice starch (as observed by AFM) correspond to the blocklet of amorphous and crystalline lamellae. These blocklet have an average size of 100 nm in diameter and are proposed to contain 280 amylopectin side chain clusters. Amorphous lamellae contain branch points of the amylopectin side chains and possibly some amylose, whereas semi- crystalline lamellae are constituted of amylopectin double helices (Figure 2 C). Figure 2 Granule structure of rice starch and lamellar structure of a starch granule Source: Donald et al.(1997) and Dang and Copeland (2003) 17
2.3 Chemical composition of rice starch Rice starch is made up of two distinct polymers, amylose and amylopectin; 98.50% of the starch granule is α-glucans. Both amylose and amylopectin are glucose polymers linked by the α-(1,4) linkage (Takeda et al. (1993) . Amylopectin also contains 4-5% of α-(1,6) linkages, leading to a branched molecule (Cura and Krisman, 1990). The average chain length for cereal amylopectin is 20-26 glucose units. The rice starch type can vary in certain genotype from regular waxy rice (0-2%), very low amylose rice (5-12 %), low amylose rice (12 – 20%), medium amylose rice (20-25%) and high amylose rice (25-33 %) (Juliano, 1992). Rice starch, as other starch, is composed of two polymeric forms of glucose: amylose and amylopectin (Figure 3). These two molecules are organized into a radically anisotropic, semi-crystalline structure in the starch granule (Lineback, 1984). Figure 3 Representative partial structures of amylose and amylopectin Source: Takeda et al. (1993) 2.3.1 Rice amylose Amylose was long believed to be a linear polymer. However, in recent years it has become known that amylose contains linear and branched chains 18
Page 1: THESIS ENZYME-RESISTANT STARCH TYPE
Page 5 and 6: ACKNOWLEDGEMENTS I wish to express
Page 7 and 8: LIST OF TABLES Table Page 1 Classif
Page 9 and 10: LIST OF TABLES (Continued) Table Pa
Page 11 and 12: LIST OF FIGURES (Continued) Figure
Page 13 and 14: LIST OF FIGURES (Continued) Appendi
Page 15 and 16: LIST OF ABBREVIATIONS (Continued) R
Page 17 and 18: een used to produce a sample with l
Page 19 and 20: Overall objectives: OBJECTIVES 1. T
Page 21 and 22: However, it was discovered that a r
Page 23 and 24: Cassidy et al. (1994), in an intern
Page 25 and 26: fed both the 45 and 63g/100g rice s
Page 27 and 28: only about 3 g. The physiological b
Page 29 and 30: (Brown et al. 1995). This product,
Page 31: Figure 1 A detailed structure of th
Page 35 and 36: helix with only the ring oxygen poi
Page 37 and 38: Figure 5 Idealized diagram of the c
Page 39 and 40: 2.5 Rice starch gelatinization Gela
Page 41 and 42: in excess water. The loss of birefr
Page 43 and 44: morphological changes occurring at
Page 45 and 46: amylose is the linear fraction of s
Page 47 and 48: units are known to inhibit retrogra
Page 49 and 50: (-1 to 43 o C) on concentrated star
Page 51 and 52: Figure 10 Schematic diagram showing
Page 53 and 54: ice due to the various cooking and
Page 55 and 56: Recently, there has been a flurry o
Page 57 and 58: 3.1 Processing condition on improve
Page 59 and 60: of RS overall, 60%, among the three
Page 61 and 62: chains but liberates longer chains
Page 63 and 64: 4.1 Amylolytic enzymes Three groups
Page 65 and 66: Structure and properties of β- amy
Page 67 and 68: Structure and properties: The pullu
Page 69 and 70: Action pattern: The amyloglucosidas
Page 71 and 72: methods, for instance in scanning e
Page 73 and 74: 6. Low glycemic butter cake product
Page 75 and 76: Sugar increases cake volume by decr
Page 77 and 78: cereals, and baked potatoes. Low gl
Page 79 and 80: way to achieve a healthy food produ
Page 81 and 82: complexes. In the meantime, and inv
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would be only 2. In comparison, the
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ecause of an absolute decrease in t
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enhanced fat oxidation at the expen
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1. Raw Materials MATERIALS AND METH
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Methods 1. Production of resistant
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1.2.3 Degree of syneresis Degree of
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1.2.9 Starch hydrolysis rate and es
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1.3.3 Resistant starch content, sta
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2.1.1 Cake sample preparation Cake
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Nevertheless, the former refers to
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3. Experimental Design and Statisti
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essentially linear polymer of α-(1
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hydrolysis of the rice starch prehe
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a) b) Figure 15 Scanning electron m
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amylose content of starch had a har
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Degree of syneresis (%) 70.0 60.0 5
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1.2.7 Physicochemical properties of
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1.2.8 In vitro starch digestibility
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1.2.9 Hydrolysis index and glycemic
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Table 16 Effect of preheated treatm
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1.2.10 Crystallinity of RS III 108
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Figure 22 X-ray diffraction pattern
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content. The high correlation facto
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1.3.2 β-amylolysis (%) 114 β-amyl
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1.3.4 In vitro starch digestibility
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118 Non significant differences (P
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1.4.2 Degree of hydrolysis 120 The
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2 An application of resistant starc
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sucrose or maltose are reducing suc
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126 The different effect of HFCS on
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2.1.2 Sensory evaluation of HFCS re
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and objective percent moisture gene
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132 In the dietetic cake mix of Cor
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3) In vitro starch digestibility 13
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Table 23 Percentage (dwb) of starch
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al. (2006) reported that when gluco
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140 volume, crust and crumb color o
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(P
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2.2.2 Sensory evaluation of RS III
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3) Flavor score 146 Flavor is the m
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2.2.3 Chemical composition of RS II
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Table 27 Mean values for chemical c
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Table 28 Percentage (dwb) of starch
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cake is lower in these samples than
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CONCLUSIONS AND RECOMMENDATIONS 156
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158 syneresis of retrograded starch
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LITERATURE CITED Abe, J.I., K. Naka
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Biliaderis, C.G. and J. Zawastowski
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Cheng, H.H. and M.H. Lai. 2000. Fer
Page 181 and 182:
Elgun, A. Z. Ertugay, M. Certel, an
Page 183 and 184:
Fitt L.E. and E.M. Snyder. 1984. Ph
Page 185 and 186:
Grandfeldt, A., C. Eliasson and I.
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Hoseney, R.C. 1990. Principles of C
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Juliano, B.O. and M.S. Goddard. 198
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Lavin, M., E. Eshbaugh, J.-M. Hu, S
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Ludwig, D.S. and R.H. Eckel. 2002.
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Meilgaard, M., Civille, O.V., and C
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Nakazawa, F., S. Noguchi, J.Takahas
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Piyarat, N. 2003. The assessment of
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Schoch, T. J. 1969. Non-carbohydrat
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Srinivasa Rao, P. 1970. Studies on
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Towar, J., C. Melito, E. Herrera, A
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Yuan, R.C. and D.B. Thompson. 1998.
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Appendix A Chemical analysis proced
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2.2 Method determination 196 Total
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source and detach the extractor and
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5.3 Procedure for Preparation for S
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1) Standard curve procedure 202 Usi
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7. Reducing sugar determination by
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8. Resistant starch determination b
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8.2.3 Measurement of resistant star
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lank. starch. 210 3. Measure the ab
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Appendix B Physical analysis proced
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2. X Ray Diffraction Measurement 2.
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Appendix C Picture of some experime
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Heated debranched samples Cooled de
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Appendix Figure C4 Visuals appearan
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1. Introduction 222 There are sever
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Appendix E Experimental data 224
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Appendix Table E3 X-ray diffraction
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Appendix F List of publications 228
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NAME : Miss Jirapa Pongjanta BIRTH
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