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Sucrose: A Prospering and Sustainable Organic Raw Material

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Carbohydrates in Sustainable Development I

Part of the book series: Topics in Current Chemistry ((TOPCURRCHEM,volume 294))

Abstract

Sucrose (α-d-glucopyranosyl-(1→2)-β-d-fructofuranoside) is an inexpensive chemical produced by sugar cane and sugar beet cultivation. Chemical and/or biochemical transformations convert it into highly valuable synthetic intermediates such as 5-hydroxymethylfurfural (HMF), bioethylene, 1,2-propylene glycol and levulinic acid. Sucrose can also be converted into biodegradable polymers such as polyesters and polyurethanes, as well as into novel carbohydrates such as isomaltulose, trehalulose, inulin, levan, Neo-amylose, and dextran, highly valuable additives for food and cosmetics and materials for separation and purification technologies.

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References

  1. Bartens A (2009) Zuckerwirtschaft Europa. Verlag Dr Albert Bartens KG, Berlin

    Google Scholar 

  2. Queneau Y, Jarosz S, Lewandowski B, Fitremann J (2007) Adv Carbohydr Chem Biochem 61:217

    Article  CAS  Google Scholar 

  3. Peters D (2007) Nachwachsende Rohstoffe in der Industrie Fachagentur Nachwachsende Rohstoffe, 2. Aufl, Gülzow

    Google Scholar 

  4. Jahresbericht 2005/2006 (2006) Fachagentur Nachwachsende Rohstoffe, Gülzow

    Google Scholar 

  5. Lichtenthaler FW (2006) In: Kamm B, Gruber PR, Kamm M (eds) Biorefineries – industrial processes and products, vol 2. Wiley-VCH, Weinheim, p 3

    Google Scholar 

  6. Frenzel S, Peters S, Rose T, Kunz M (2009) In: Höfer R (ed) Sustainable solutions for modern economics. RSC Publishing, p 264 -->

    Google Scholar 

  7. Lichtenthaler FW, Peters S (2004) CR Chimie 7:65

    Article  CAS  Google Scholar 

  8. Chheda JN, Huber GW, Dumesic JA (2007) Angew Chem Int Ed 119:7298

    Article  Google Scholar 

  9. Press release from 04.06.2008. http://www.marketwatch.com (retrieved 28.07.2008)

  10. Press release from 28.03.2008. http://www.braskem.com.br (retrieved 31.07.2008)

  11. Press Release from 14.12.2007. http://www.solvinpvc.com (retrieved 25.02.2008); http://desarrolloydefensa.blogspot.com/2008/04/solvay-indupa-firma-contrato-con.html (retrieved 27.11.2008)

  12. Denis N, Meiser A, Riese J, Weihe U (2008) Setting the right course in biobased bulk chemicals 1:22

    Google Scholar 

  13. Press release from 15.07.2009. http://www.icis.com (retrieved 12.11.2009)

  14. Claus P, Vogel GH (2006) Chem Ing Tech 78:991

    Article  CAS  Google Scholar 

  15. Weidenhagen R, Wegner H (1938) Chem Ber 71:2712

    Google Scholar 

  16. Ling GV, Driessen AJ, Piet AC, Vligter JC (1970) Ind Eng Chem Prod Res Dev 9:210

    Article  Google Scholar 

  17. Wright LW (1976) US 3 965 199 (CI America Inc)

    Google Scholar 

  18. Weissermel K, Arpe H-J (2003) Industrial organic chemistry. Wiley-VCH, Weinheim

    Book  Google Scholar 

  19. Schuster L, Himmele W (1989) DE 38 18 198 (BASF AG)

    Google Scholar 

  20. Schuster L (1991) DE 39 28 285 (BASF AG)

    Google Scholar 

  21. De Oliveira K, Vigier FJ (2010) Heterogeneously-catalyzed conversion of carbohydrates. Top Curr Chem. doi:10.1007/128_2010_55

    Google Scholar 

  22. Schiweck H, Munir M, Rapp K, Vogel M (1991) In: Lichtenthaler FW (ed) Carbohydrates as organic raw materials. VCH, Weinheim, p 57

    Google Scholar 

  23. Lewkowski J (2001) ArkiVoc i:17

    Google Scholar 

  24. Kuster BFM (1990) Starch/Stärke 42:314

    Article  CAS  Google Scholar 

  25. Gaset A, Rigal L, Paillassa G, Salome J-P, Fleche G (1985) FR 2 551 754 (Roquette Freres)

    Google Scholar 

  26. Brown DW, Floyd AJ, Kinsmann RC, Roshan-Ali Y (1982) J Chem Technol Biotechnol 32:920

    Article  CAS  Google Scholar 

  27. Musau RM, Munawu RM (1987) Biomass 13:67

    Article  CAS  Google Scholar 

  28. Hirth J (2002) Dissertation, TU Darmstadt

    Google Scholar 

  29. Bicker M, Hirth T, Vogel H (2003) Green Chem 5:280

    Article  CAS  Google Scholar 

  30. Bicker M (2005) Stoffliche Nutzung von Biomasse mit Hilfe überkritischer Fluide. Dissertation, TU Darmstadt

    Google Scholar 

  31. Bicker M, Kaiser D, Ott L, Vogel H (2005) J Supercrit Fluids 36:118

    Article  CAS  Google Scholar 

  32. Zhao H, Holladay JE, Brown H, Zhang ZC (2007) Science 316:1597

    Article  CAS  Google Scholar 

  33. Yong G, Zhang Y, Jing JY (2008) Angew Chem Int Ed 47:9345

    Article  CAS  Google Scholar 

  34. Rapp KM (1987) EP 230 250 (Südzucker AG)

    Google Scholar 

  35. Kamm B, Kamm M, Schmidt M, Hirth T, Schulze M (2006) In: Kamm B, Gruber PR, Kamm M (eds) Biorefineries – industrial processes and products, vol 2. Wiley-VCH, Weinheim, p 97

    Google Scholar 

  36. Lichtenthaler FW (2002) Ullmann’s encyclopedia industrial chemistry, 6th edn, vol 6. Wiley-VCH, Weinheim, p 237

    Google Scholar 

  37. Gandini A, Belgacem MN (1997) Prog Polym Sci 22:1203

    Article  CAS  Google Scholar 

  38. Yashida N, Kasuya N, Haga N, Fukuda K (2008) Polym J 47:1164

    Article  Google Scholar 

  39. Werpy T, Petersen G http://www1.eere.energy.gov/biomass/pdfs/35523.pdf (publication is dated August 2004)

  40. Manzer LE (2006) ACS Symp Ser 921:40

    Article  CAS  Google Scholar 

  41. Nelen BAP, Cooper JM (2004) In: Whitehurst RJ (ed) Emulsifiers in food technology. Wiley-Blackwell, UK, p 131

    Chapter  Google Scholar 

  42. Wang Y-J (2004) In: Tomasik P (ed) Chemical and functional properties of food saccharides. CRC, Boca Raton, p 35

    Google Scholar 

  43. Bimal C, Guonong Z (2006) Food Rev Int 22:245

    Article  CAS  Google Scholar 

  44. Hass HB (1968) Sugar esters. Noyes Development Corporation, Park Ridge, NJ, p 1

    Google Scholar 

  45. Osipow L, Snell FD, York WC, Finchler A (1956) Ind Eng Chem 48:1459

    Article  CAS  Google Scholar 

  46. Hough L (1991) In: Lichtenthaler FW (ed) Carbohydrates as organic raw materials. VCH, Weinheim, p 33

    Google Scholar 

  47. Karmee SK (2008) Biofuels Bioprod Bioref 2:144

    Article  CAS  Google Scholar 

  48. Brockway BE (2005) Cosmetics & Toiletries Magazine 120:93

    CAS  Google Scholar 

  49. Godshall MA (2001) Int Sugar J 103:1233

    Google Scholar 

  50. Le Maistre JW, Seymour RB (1948) J Org Chem 13:782

    Article  Google Scholar 

  51. Kollonitsch V (1970) Sucrose chemicals. The International Sugar Research Foundation Inc, Washington

    Google Scholar 

  52. Frich KC, Kresta JE (1977) In: Hickson JL (ed) Sucrochemistry. ACS symposium series, vol 41. ACS, Washington, p 238

    Google Scholar 

  53. Vohrspohl K, Hinz W, Güttes B (1993) In: Eggersdorfer M, Warwel S, Wulff G (eds) Nachwachsende Rohstoffe – Perspektiven für die Chemie. VCH, Weinheim/New York, p 383

    Google Scholar 

  54. Jhurry D, Deffieux A (1997) Eur Polym J 33:1577

    Article  CAS  Google Scholar 

  55. Chauvin C, Aczko K, Plusquellec D (1993) J Org Chem 58:2291

    Article  CAS  Google Scholar 

  56. Kohlstrung R (2001) Polyurethan – Präpolymere auf der Basis von Sacchariden und Saccharid-Derivaten-Von der Selektivität zur anwendungstechnischen Prüfung. Dissertation, TU Darmstadt

    Google Scholar 

  57. Fairclough PH, Hough L, Richardson AC (1975) Carbohydr Res 40:285

    Article  CAS  Google Scholar 

  58. Hough L, Phadnis SP, Khan RA, Jenner MR (1977) GB 1 543 167 (Tate & Lyle)

    Google Scholar 

  59. Molinary SV, Jenner MR (1999) Food Food Ingredients J Jpn 182:6

    CAS  Google Scholar 

  60. Molinary SV, Quinlan ME (2006) In: Mitchell H (ed) Sweeteners and alternatives in food technology. Blackwell Publishing, Oxford, UK, p 130

    Google Scholar 

  61. Sham CW (2005) Nutritional bytes 10/2 article 5. http://repositories.cdlib.org/uclabiolchem/nutritionbytes/vol10/iss2/art5

  62. Navia JL (1990) US 4 950 746 (Noramco Inc)

    Google Scholar 

  63. Neiditch DS, Vernon NM, Wingard RE (1991) US 5 023 329 (Noramco Inc)

    Google Scholar 

  64. Walkup RE, Vernon NM, Wingard RE (1992) US 5 089 608 (McNeill PPC Inc)

    Google Scholar 

  65. Sankey GH, Vernon NM, Wingard RE (1995) US 5 470 969 (McNeill PPC Inc)

    Google Scholar 

  66. White JE, Bradford BA (1997) EP 776 903 (McNeill PPC Inc)

    Google Scholar 

  67. Clark JD, LeMay RR (2003) US 6 939 962 (Tate & Lyle)

    Google Scholar 

  68. Mufti KS, Khan RA (1983) US 4 380 476 (Talres Dev)

    Google Scholar 

  69. Simpson PJ (1989) US 4 889 928 (Tate & Lyle)

    Google Scholar 

  70. Dordick JS, Hacking AJ, Khan RA (1992) US 5 128 248 (Tate & Lyle)

    Google Scholar 

  71. Dordick JS, Hacking AJ, Khan RA (1993) US 5 270 460 (Tate & Lyle)

    Google Scholar 

  72. Bornemann S, Cassells JM, Combes L, Dordik JS, Hacking AJ (1992) US 5 141 860 (Tate & Lyle)

    Google Scholar 

  73. Palmer DC, Terradas F (1995) US 5 445 951 (McNeill PPC Inc)

    Google Scholar 

  74. Walkup RE, Navis JL, Vernon NM (1990) US 4 980 463 (Noramco Inc)

    Google Scholar 

  75. Khan RA, Sankey GH, Simpson PJ, Vernon NM (1992) US 5 136 031 (Tate & Lyle)

    Google Scholar 

  76. Navia JL, Walkup RE, Neiditch DS (1996) US 5 530 106 (McNeill PPC Inc)

    Google Scholar 

  77. Navia JL, Walkup RE, Vernon NM, Neiditch DS (1996) US 5 498 709 (McNeill PPC Inc)

    Google Scholar 

  78. Navia JL, Walkup RE, Vernon NM, Wingard RE (1994) US 5 298 611 (McNeill PPC Inc)

    Google Scholar 

  79. Catani SJ, Leinhos DA, O’Connor T (1999) US 5 977 349 (McNeill PPC Inc)

    Google Scholar 

  80. Vernon NM, Micinski E, Catani SJ, Navia JL (2003) US 6 890 581 (McNeill PPC Inc)

    Google Scholar 

  81. Seibel J, Beine R, Moraru R, Behringer C, Buchholz K (2006) Biocatal Biotransformation 24:157

    Article  CAS  Google Scholar 

  82. Vasik-Racki D (2006) In: Liese A, Seelbach K, Wandrey C (eds) Industrial biotransformations. Wiley-VCH, Weinheim, p 29

    Google Scholar 

  83. Buchholz K, Kasche V (1997) Biokatalysatoren und Enzymtechnologie. VCH, Weinheim, p 11

    Google Scholar 

  84. Wach W (2004) Ullmann’s encyclopedia of industrial chemistry, 7th edn. Wiley-VCH, Weinheim. doi:10.1002/14356007.a12.047

    Google Scholar 

  85. Bruhns J (1991) Zuckerind 116:736

    Google Scholar 

  86. Kowalczyk J (2007) In: Rosenplenter K, Noehle U (eds) Handbuch Süßungsmittel. Behr’s Verlag, Hamburg, p 194

    Google Scholar 

  87. Kowalczyk J (2007) In: Rosenplenter K, Noehle U (eds) Handbuch Süßungsmittel. Behr’s Verlag, Hamburg, p 295

    Google Scholar 

  88. Liese A, Seelbach K, Wandrey C (2006) Industrial biotransformations. Wiley-VCH, Weinheim, p 512

    Book  Google Scholar 

  89. Nakajima Y (1988) Denpun Kagaku 35:131

    CAS  Google Scholar 

  90. Rose T, Kunz M (2002) In: Prüsse U, Vorlop KD (eds) Practical aspects of encapsulation technologies, vol 241. Federal Agricultural Research Centre (FAL), Braunschweig, p 75

    Google Scholar 

  91. Schiweck H, Munir M, Rapp KM, Schneider B, Vogel M (1990) Zuckerind 115:555

    CAS  Google Scholar 

  92. Straeter PJ (1987) Zuckerind 112:900

    Google Scholar 

  93. Taniguchi H (2005) In: Hou CTJ (ed) Handbook of industrial catalysis, vol 20. CRC, Taylor & Francis Group, Boca Raton, pp 1–25

    Google Scholar 

  94. Lorenz S (1958) Zuckerind 8:490

    CAS  Google Scholar 

  95. Lorenz S (1958) Zuckerind 8:535

    Google Scholar 

  96. Nakajima Y (1984) Proc Res Soc Jpn Sugar Refin Technol 33:55

    Google Scholar 

  97. Weidenhagen R, Lorenz S (1957) Angew Chem 69:641

    Article  CAS  Google Scholar 

  98. Weidenhagen R, Lorenz S (1957) Zuckerind 7:533

    CAS  Google Scholar 

  99. Cartarius R, Krause T, Vogel H (2001) Chem Ing Tech 73:118

    Article  Google Scholar 

  100. Cartarius R, Krause T, Vogel H (2002) Chem Ing Tech 74:869

    Article  CAS  Google Scholar 

  101. Cartarius R (1999) Bioabbaubare Tenside durch reduktive Aminierung von Isomaltulose – Katalysator und Verfahrensentwicklung. Dissertation, TU Darmstadt

    Google Scholar 

  102. Schiweck H (1980) Alimenta 19:5

    CAS  Google Scholar 

  103. Dreissig W, Luger P (1973) Acta Crystallogr B 29:514

    Article  CAS  Google Scholar 

  104. Jarell HC, Conwell TF, Moya P, Smith ICP (1979) Carbohydr Res 76:45

    Article  Google Scholar 

  105. Seymour FR, Knapp RD, Zweig JE, Bishop SH (1979) Carbohydr Res 72:57

    Article  CAS  Google Scholar 

  106. Cheetham PSJ, Imber CE, Isherwood J (1982) Nature 299:628

    Article  CAS  Google Scholar 

  107. Huang JH, Hsu LH, Su YC (1998) J Ind Microbiol Biotechnol 21:22

    Article  CAS  Google Scholar 

  108. Baer A (1989) Lebensm Wiss Technol 22:46

    Google Scholar 

  109. Minami T, Fujiwara T, Ooshima T, Nakajima Y, Hamada S (1990) Oral Microbiol Immunol 5:189

    Article  CAS  Google Scholar 

  110. Ooshima T, Izumitani A, Sobue S, Okahashi N, Hamada S (1983) Infect Immun 39:43

    CAS  Google Scholar 

  111. Ohata K, Takazoe I (1983) Bull Tokyo Dent Coll 24:1

    Google Scholar 

  112. Sasaki N, Topitsoglou V, Takazoe I, Frostell G (1985) Swed Dent J 9:149

    CAS  Google Scholar 

  113. Takazoe I (1985) Int Dent J 35:58

    CAS  Google Scholar 

  114. Takazoe I, Frostell G, Ohta K, Topitsoglou V, Sasaki N (1985) Swed Dent J 9:81

    CAS  Google Scholar 

  115. Topitsoglou V, Sasaki N, Frostell G (1984) Caries Res 18:47

    Article  CAS  Google Scholar 

  116. Kawai K, Okuda Y, Yamashita K (1985) Endocrinol Jpn 32:933

    Article  CAS  Google Scholar 

  117. Kawai K, Yoshikawa H, Murayama Y, Okuda Y, Yamashita K (1989) Horm Metab Res 21:338

    Article  CAS  Google Scholar 

  118. Kashimura J, Nagai Y, Ebashi T (2003) J Nutr Sci Vitamino (Tokyo) 49:214

    Article  CAS  Google Scholar 

  119. Krastanov A, Yoshida T (2003) J Ind Microbiol Biotechnol 30:593

    Article  CAS  Google Scholar 

  120. Wilson R (2007) Sweeteners, 3rd edn. Wiley-Blackwell, Oxford, UK

    Google Scholar 

  121. Asquith J, Pickering K, Trenchard-Morgan S, Sangster S (1986) Completion of bacterial reverse mutation test on isomaltulose. Toxicol Lab Ltd, Ledbury, Herefordshire

    Google Scholar 

  122. Jonker D, Lina BAR, Kozianowski G (2002) Food Chem Toxicol 40:1383

    Article  CAS  Google Scholar 

  123. Lina BAR, Smits-van Prooji AE, Waalkens-Berendsen DH (1997) Food Chem Toxicol 35:309

    Article  CAS  Google Scholar 

  124. Lina BAR, Jonker D, Kozianowski G (2002) Food Chem Toxicol 40:1375

    Article  CAS  Google Scholar 

  125. Nagai Y, Sugitani T, Tsuyuki K, Yamada K, Ebashi T, Kishihara S (2002) Proc Res Soc Jpn Sugar Refin Technol 50:57

    CAS  Google Scholar 

  126. Nagai Y, Sugitani T, Yamada K, Ebashi T, Kishihara S (2003) J Jpn Soc Food Sci Technol 50:488

    Article  CAS  Google Scholar 

  127. Ravaud S, Robert X, Watzlawick H, Haser R, Mattes R, Aghajari N (2007) J Biol Chem 282:28126

    Article  CAS  Google Scholar 

  128. Gruell DR, Haji Begli A, Kubadinow N, Kunz M, Munir M (1998) EP 943 030 (Suedzucker AG)

    Google Scholar 

  129. Edelman J, Jefford TG (1968) New Phytologist 67:517

    Article  CAS  Google Scholar 

  130. Franck A, de Leenheer L (2002) In: Steinbüchel A (ed) Biopolymers, vol 6. Polysaccharides II: polysaccharides from eukaryotes. Wiley-VCH, Weinheim, p 439

    Google Scholar 

  131. Iizuka M, Minamiura N, Ogura T (2000) In: Ohnishi M (ed) Glycoenzymes. Tokyo, Karger

    Google Scholar 

  132. van Laere A, van den Ende W (2002) Plant Cell Environ 25:803

    Article  Google Scholar 

  133. Seibel J, Moraru R, Goetze S, Buchholz K, Na’amnieh S, Pawlowski A, Hecht HJ (2006) Carbohydr Res 341:2335

    Article  CAS  Google Scholar 

  134. Han YW (1990) Adv Appl Microbiol 25:171

    Article  Google Scholar 

  135. Pontis HG (1990) In: Dey PM (ed) Methods in plant biochemistry: carbohydrates, vol 2. Academic, New York, p 353

    Google Scholar 

  136. Rhee SK, Song KB, Kim CH, Park BS, Jang EK, Jang KH (2002) In: Vandamme EJ, de Baets S, Steinbüchel A (eds) Biopolymers, vol 5. Polysaccharides I: polysaccharides from prokaryotes. Wiley-VCH, Weinheim, p 351

    Google Scholar 

  137. Abrams S, Griffin I, Hawthorne K, Liang L, Gunn S, Darlington G, Ellis K (2005) Am J Clin Nutr 82:471

    CAS  Google Scholar 

  138. Anand CM, Ashton F, Shaw H, Gordon R (1991) J Clin Microbiol 29:22434

    Google Scholar 

  139. Bengs H, Brunner A (2000) WO 0038537 (Aventis Res & Tech GmbH)

    Google Scholar 

  140. Bengs H, Schneller A (2000) WO 0038623 (Aventis Res & Tech GmbH)

    Google Scholar 

  141. Leathers TD (2002) In: Vandamme EJ, de Baets S, Steinbüchel A (eds) Biopolymers, vol 5. Polysaccharides I: polysaccharides from prokaryotes. Wiley-VCH, Weinheim, Germany, p 299

    Google Scholar 

  142. Naessens M, Cerdobbel A, Soetaert W, Vandamme EJ (2005) J Chem Technol Biotechnol 80:845

    Article  CAS  Google Scholar 

  143. Alsop RM (1983) In: Bushell ME (ed) Microbial polysaccharides. Elsevier, Amsterdam, p 1

    Google Scholar 

  144. de Belder AN (1996) In: Dumitriu S (ed) Polysaccharides in medical applications. Marcel Dekker, New York, p 505

    Google Scholar 

  145. Robyt JF (1985) In: Kroschwitz JI (ed) Encyclopaedia of polymer science, vol 4. Wiley-VCH, New York, p 753

    Google Scholar 

  146. Yalpani M (1985) CRC Crit Rev Biotechnol 3:375

    Article  Google Scholar 

  147. Kaga T, Mizutani T (1985) Proc Res Soc Jpn Sugar Refin Technol 34:45

    Google Scholar 

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Authors and Affiliations

  1. Central Department Research, Development, Technological Services (CRDS), Südzucker AG Mannheim/Ochsenfurt, Wormser Strasse 11, 67283, Obrigheim, Germany

    Siegfried Peters, Thomas Rose & Matthias Moser

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  1. Siegfried Peters
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  2. Thomas Rose
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  3. Matthias Moser
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Correspondence to Siegfried Peters .

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Editors and Affiliations

  1. Fac. Ciências, Depto. Química e Bioquímica, Universidade de Lisboa, Campo Grande, Lisboa, 1749-016, Portugal

    Amélia P. Rauter

  2. Inst. Chimie Organique, Université Lausanne, Lausanne, 1015, Switzerland

    Pierre Vogel

  3. Labo. Chimie Organique (LCO), INSA Lyon, av. Albert Einstein 20, Villeurbanne CX, 69621, France

    Yves Queneau

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Peters, S., Rose, T., Moser, M. (2010). Sucrose: A Prospering and Sustainable Organic Raw Material. In: Rauter, A., Vogel, P., Queneau, Y. (eds) Carbohydrates in Sustainable Development I. Topics in Current Chemistry, vol 294. Springer, Berlin, Heidelberg. https://doi.org/10.1007/128_2010_58

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