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1.2.4 Retrogradation gel images Retrogradation gel images of 0 - 48 hr debranched high amylose rice starch preheated at 75, 95, and 121 o C for 30 min are shown in Figure 16. Briefly, all debranched starch solutions were heated in boiling bath for 30 min to stop any further enzymatic activity and to unwind any double helices, melt the crystallites and retrograde starch which might have formed during the initial heating and incubation at 55 o C during 4 to 48 hr debranching. Visible precipitates formed immediately after removing and cooling the debranched solution from the boiling. As the cooling progressed (at 4 o C for 16 hr), increases in turbidity and precipitate formation were noticed. The 16 to 48 hr debranched of rice starch preheated at 75 o C, 95 o C and 121 o C had higher turbidity gel than 0 to 4 hr debranched samples that moderate clarity and harder gelation than 8 hr debranched samples. The turbidity and clarity differences between the studied starches may affected by the degree of retrogradation, granule swelling and the association between amylose and amylopectin (Swinkels, 1985). Very slowly retrogradation gel was visible observed for the control sample (non enzyme) cooling for first hour in an ice bath at 4 o C. In contrast, the 16 to 48-hr debranched of rice starch gel retrograded much more rapidly during the first hour of cooling in the same condition. The major factors influencing rice starch retrogradation would be starch content, ratio of amylose to amylopectin, and the branch chain length of amylopectin. Although both amylose and amylopectin components are involved in the process of starch retrogradation, the linear fraction, amylose, favors recrystallization in a rapid mode (Slade and Levine, 1988a). When starch is gelatinized under high moisture content and allowed to cool, alignment of order amylose molecules and debranched amylopectin with each other leads to the formation of a rigid gel. A rearrangement between starches occurs and a three-dimensional network is rapidly constituted. The higher the 95
amylose content of starch had a harder the starch gel. The starch gel structure has lower α- amylase susceptibility than a paste. Resistant starch is produced as the insoluble crystallite formed by the process of controlled retrogradation (Englist et al. 1992). The crystalline structure of retrograded amylose is acid and heat- resistant. Its melting-point is above 120°C. In vitro, the retrograded starch and retrograded amylose fraction are highly resistant to α- amylase (Tetens et al. 1997). a) b) c) 4-hr hydrolysis 16-hr hydrolysis 24-hr hydrolysis 48-hr hydrolysis Figure 16 The typical appearance of retrogradation gel from 4, 16, 24 and 48-hr debranched HARS preheated at 75°C (a), 95°C (b) and 121 o C (c) for 30 min 96
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THESIS ENZYME-RESISTANT STARCH TYPE
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ACKNOWLEDGEMENTS I wish to express
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LIST OF TABLES Table Page 1 Classif
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LIST OF TABLES (Continued) Table Pa
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LIST OF FIGURES (Continued) Figure
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LIST OF FIGURES (Continued) Appendi
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LIST OF ABBREVIATIONS (Continued) R
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een used to produce a sample with l
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Overall objectives: OBJECTIVES 1. T
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However, it was discovered that a r
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Cassidy et al. (1994), in an intern
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fed both the 45 and 63g/100g rice s
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only about 3 g. The physiological b
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(Brown et al. 1995). This product,
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Figure 1 A detailed structure of th
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2.3 Chemical composition of rice st
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helix with only the ring oxygen poi
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Figure 5 Idealized diagram of the c
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2.5 Rice starch gelatinization Gela
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in excess water. The loss of birefr
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morphological changes occurring at
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amylose is the linear fraction of s
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units are known to inhibit retrogra
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(-1 to 43 o C) on concentrated star
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Figure 10 Schematic diagram showing
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ice due to the various cooking and
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Recently, there has been a flurry o
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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
Page 83 and 84: would be only 2. In comparison, the
Page 85 and 86: ecause of an absolute decrease in t
Page 87 and 88: enhanced fat oxidation at the expen
Page 89 and 90: 1. Raw Materials MATERIALS AND METH
Page 91 and 92: Methods 1. Production of resistant
Page 93 and 94: 1.2.3 Degree of syneresis Degree of
Page 95 and 96: 1.2.9 Starch hydrolysis rate and es
Page 97 and 98: 1.3.3 Resistant starch content, sta
Page 99 and 100: 2.1.1 Cake sample preparation Cake
Page 101 and 102: Nevertheless, the former refers to
Page 103 and 104: 3. Experimental Design and Statisti
Page 105 and 106: essentially linear polymer of α-(1
Page 107 and 108: hydrolysis of the rice starch prehe
Page 109: a) b) Figure 15 Scanning electron m
Page 113 and 114: Degree of syneresis (%) 70.0 60.0 5
Page 115 and 116: 1.2.7 Physicochemical properties of
Page 117 and 118: 1.2.8 In vitro starch digestibility
Page 119 and 120: 1.2.9 Hydrolysis index and glycemic
Page 121 and 122: Table 16 Effect of preheated treatm
Page 123 and 124: 1.2.10 Crystallinity of RS III 108
Page 125 and 126: Figure 22 X-ray diffraction pattern
Page 127 and 128: content. The high correlation facto
Page 129 and 130: 1.3.2 β-amylolysis (%) 114 β-amyl
Page 131 and 132: 1.3.4 In vitro starch digestibility
Page 133 and 134: 118 Non significant differences (P
Page 135 and 136: 1.4.2 Degree of hydrolysis 120 The
Page 137 and 138: 2 An application of resistant starc
Page 139 and 140: sucrose or maltose are reducing suc
Page 141 and 142: 126 The different effect of HFCS on
Page 143 and 144: 2.1.2 Sensory evaluation of HFCS re
Page 145 and 146: and objective percent moisture gene
Page 147 and 148: 132 In the dietetic cake mix of Cor
Page 149 and 150: 3) In vitro starch digestibility 13
Page 151 and 152: Table 23 Percentage (dwb) of starch
Page 153 and 154: al. (2006) reported that when gluco
Page 155 and 156: 140 volume, crust and crumb color o
Page 157 and 158: (P
Page 159 and 160: 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
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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
Page 197 and 198:
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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