Molecular and thermal characterization of starches isolated from African rice (Oryza glaberrima)
Starch is the principal component of rice that affects its cooking and nutritional quality. This study investigated molecular and thermal properties of starches isolated from seven Africa rice accessions (ARAs) in comparison with two commonly produced Asian rice varieties (ARVs) and a developed cros...
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| Veröffentlicht in: | Die Stärke 2016-01, Vol.68 (1-2), p.9-19 |
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| creator | Gayin, Joseph Bertoft, Eric Manful, John Yada, Rickey Y Abdel‐Aal, El‐Sayed M |
| description | Starch is the principal component of rice that affects its cooking and nutritional quality. This study investigated molecular and thermal properties of starches isolated from seven Africa rice accessions (ARAs) in comparison with two commonly produced Asian rice varieties (ARVs) and a developed cross (sativa × glaberrima) variety (NERICA 4). All starch granules were polyhedral and tightly packed with size distribution ranging from 2–22 µm and displayed type‐A X‐ray diffraction pattern. ARAs starch granules had higher ratio of absorbance to scattering when exposed to iodine vapor exhibiting greater flexibility and availability of glucan chains to form complexes with iodine as compared to ARVs. The enthalpies of starch gelatinization (15.1–15.8 J/g) and retrograded gel melting (9.2–10.8 J/g) were higher in ARAs than in NERICA 4 (14.5 and 9.2 J/g, respectively) and ARVs, (13.3–14.3 and 6.4–7.3 J/g, respectively) possibly due to their higher amylose content and longer chains. Significant (p |
| doi_str_mv | 10.1002/star.201500145 |
| format | Article |
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This study investigated molecular and thermal properties of starches isolated from seven Africa rice accessions (ARAs) in comparison with two commonly produced Asian rice varieties (ARVs) and a developed cross (sativa × glaberrima) variety (NERICA 4). All starch granules were polyhedral and tightly packed with size distribution ranging from 2–22 µm and displayed type‐A X‐ray diffraction pattern. ARAs starch granules had higher ratio of absorbance to scattering when exposed to iodine vapor exhibiting greater flexibility and availability of glucan chains to form complexes with iodine as compared to ARVs. The enthalpies of starch gelatinization (15.1–15.8 J/g) and retrograded gel melting (9.2–10.8 J/g) were higher in ARAs than in NERICA 4 (14.5 and 9.2 J/g, respectively) and ARVs, (13.3–14.3 and 6.4–7.3 J/g, respectively) possibly due to their higher amylose content and longer chains. Significant (p < 0.05) differences in peak, trough, final, breakdown, and setback viscosities were also observed among the starches with Koshihikari Asian rice having the highest peak viscosity (310 RVU). These differences in molecular structure and thermal properties between the ARAs and ARVs are likely to influence the cooking and eating quality of the ARAs.</description><identifier>ISSN: 0038-9056</identifier><identifier>EISSN: 1521-379X</identifier><identifier>DOI: 10.1002/star.201500145</identifier><language>eng</language><publisher>Weinheim: Verlag Chemie</publisher><subject>absorbance ; African rice ; amylose ; chemical structure ; cooking ; enthalpy ; gelatinization ; Gelatinization properties ; gels ; iodine ; melting ; Molecular composition ; nutritive value ; Oryza glaberrima ; Pasting characteristics ; rice ; Rice starch ; starch granules ; thermal properties ; vapors ; viscosity ; X-ray diffraction</subject><ispartof>Die Stärke, 2016-01, Vol.68 (1-2), p.9-19</ispartof><rights>2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim</rights><rights>2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c5155-887e83ae454b33967729833e806238bec4171936c389a7db7dfe8b1ce3558e273</citedby><cites>FETCH-LOGICAL-c5155-887e83ae454b33967729833e806238bec4171936c389a7db7dfe8b1ce3558e273</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://onlinelibrary.wiley.com/doi/pdf/10.1002%2Fstar.201500145$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1002%2Fstar.201500145$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>314,780,784,1416,27922,27923,45572,45573</link.rule.ids></links><search><creatorcontrib>Gayin, Joseph</creatorcontrib><creatorcontrib>Bertoft, Eric</creatorcontrib><creatorcontrib>Manful, John</creatorcontrib><creatorcontrib>Yada, Rickey Y</creatorcontrib><creatorcontrib>Abdel‐Aal, El‐Sayed M</creatorcontrib><title>Molecular and thermal characterization of starches isolated from African rice (Oryza glaberrima)</title><title>Die Stärke</title><addtitle>Starch - Stärke</addtitle><description>Starch is the principal component of rice that affects its cooking and nutritional quality. This study investigated molecular and thermal properties of starches isolated from seven Africa rice accessions (ARAs) in comparison with two commonly produced Asian rice varieties (ARVs) and a developed cross (sativa × glaberrima) variety (NERICA 4). All starch granules were polyhedral and tightly packed with size distribution ranging from 2–22 µm and displayed type‐A X‐ray diffraction pattern. ARAs starch granules had higher ratio of absorbance to scattering when exposed to iodine vapor exhibiting greater flexibility and availability of glucan chains to form complexes with iodine as compared to ARVs. The enthalpies of starch gelatinization (15.1–15.8 J/g) and retrograded gel melting (9.2–10.8 J/g) were higher in ARAs than in NERICA 4 (14.5 and 9.2 J/g, respectively) and ARVs, (13.3–14.3 and 6.4–7.3 J/g, respectively) possibly due to their higher amylose content and longer chains. Significant (p < 0.05) differences in peak, trough, final, breakdown, and setback viscosities were also observed among the starches with Koshihikari Asian rice having the highest peak viscosity (310 RVU). These differences in molecular structure and thermal properties between the ARAs and ARVs are likely to influence the cooking and eating quality of the ARAs.</description><subject>absorbance</subject><subject>African rice</subject><subject>amylose</subject><subject>chemical structure</subject><subject>cooking</subject><subject>enthalpy</subject><subject>gelatinization</subject><subject>Gelatinization properties</subject><subject>gels</subject><subject>iodine</subject><subject>melting</subject><subject>Molecular composition</subject><subject>nutritive value</subject><subject>Oryza glaberrima</subject><subject>Pasting characteristics</subject><subject>rice</subject><subject>Rice starch</subject><subject>starch granules</subject><subject>thermal properties</subject><subject>vapors</subject><subject>viscosity</subject><subject>X-ray diffraction</subject><issn>0038-9056</issn><issn>1521-379X</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2016</creationdate><recordtype>article</recordtype><recordid>eNqFkU1P3DAQhi3USmwpV65Y4tIesvVHHDvHFWopEpTyJfZmJt4JG8iu6Tirsvz6JkqFeutlfHme1-PXjB1IMZVCqC-pA5oqIY0QMjc7bCKNkpm25fwdmwihXVYKU-yyDyk9CiFMbvSE3Z_HFsOmBeKwXvBuibSCloclEIQOqXmFrolrHms-5IclJt6k2EKHC15TXPFZTU2ANe8n8k8XtH0F_tBChUTNCj5_ZO9raBPu_z332O23rzfH37Ozi5PT49lZFow0JnPOotOAuckrrcvCWlU6rdGJQmlXYcillaUugnYl2EVlFzW6SgbUxjhUVu-xozH3meKvDabOP8YNrfsrvbTGSa2sKnpqOlKBYkqEtX8etqStl8IPLfrhlf6txV4oR-F30-L2P7S_vpld_etmo9ukDl_eXKAnX1htjb_7ceLn-c_z-VV-6Qf-cORriB4eqEn-9rqPK_rfylXhrP4DAXSOsw</recordid><startdate>201601</startdate><enddate>201601</enddate><creator>Gayin, Joseph</creator><creator>Bertoft, Eric</creator><creator>Manful, John</creator><creator>Yada, Rickey Y</creator><creator>Abdel‐Aal, El‐Sayed M</creator><general>Verlag Chemie</general><general>Blackwell Publishing Ltd</general><general>Wiley Subscription Services, Inc</general><scope>FBQ</scope><scope>BSCLL</scope><scope>AAYXX</scope><scope>CITATION</scope></search><sort><creationdate>201601</creationdate><title>Molecular and thermal characterization of starches isolated from African rice (Oryza glaberrima)</title><author>Gayin, Joseph ; Bertoft, Eric ; Manful, John ; Yada, Rickey Y ; Abdel‐Aal, El‐Sayed M</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c5155-887e83ae454b33967729833e806238bec4171936c389a7db7dfe8b1ce3558e273</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2016</creationdate><topic>absorbance</topic><topic>African rice</topic><topic>amylose</topic><topic>chemical structure</topic><topic>cooking</topic><topic>enthalpy</topic><topic>gelatinization</topic><topic>Gelatinization properties</topic><topic>gels</topic><topic>iodine</topic><topic>melting</topic><topic>Molecular composition</topic><topic>nutritive value</topic><topic>Oryza glaberrima</topic><topic>Pasting characteristics</topic><topic>rice</topic><topic>Rice starch</topic><topic>starch granules</topic><topic>thermal properties</topic><topic>vapors</topic><topic>viscosity</topic><topic>X-ray diffraction</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Gayin, Joseph</creatorcontrib><creatorcontrib>Bertoft, Eric</creatorcontrib><creatorcontrib>Manful, John</creatorcontrib><creatorcontrib>Yada, Rickey Y</creatorcontrib><creatorcontrib>Abdel‐Aal, El‐Sayed M</creatorcontrib><collection>AGRIS</collection><collection>Istex</collection><collection>CrossRef</collection><jtitle>Die Stärke</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Gayin, Joseph</au><au>Bertoft, Eric</au><au>Manful, John</au><au>Yada, Rickey Y</au><au>Abdel‐Aal, El‐Sayed M</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Molecular and thermal characterization of starches isolated from African rice (Oryza glaberrima)</atitle><jtitle>Die Stärke</jtitle><addtitle>Starch - Stärke</addtitle><date>2016-01</date><risdate>2016</risdate><volume>68</volume><issue>1-2</issue><spage>9</spage><epage>19</epage><pages>9-19</pages><issn>0038-9056</issn><eissn>1521-379X</eissn><abstract>Starch is the principal component of rice that affects its cooking and nutritional quality. This study investigated molecular and thermal properties of starches isolated from seven Africa rice accessions (ARAs) in comparison with two commonly produced Asian rice varieties (ARVs) and a developed cross (sativa × glaberrima) variety (NERICA 4). All starch granules were polyhedral and tightly packed with size distribution ranging from 2–22 µm and displayed type‐A X‐ray diffraction pattern. ARAs starch granules had higher ratio of absorbance to scattering when exposed to iodine vapor exhibiting greater flexibility and availability of glucan chains to form complexes with iodine as compared to ARVs. The enthalpies of starch gelatinization (15.1–15.8 J/g) and retrograded gel melting (9.2–10.8 J/g) were higher in ARAs than in NERICA 4 (14.5 and 9.2 J/g, respectively) and ARVs, (13.3–14.3 and 6.4–7.3 J/g, respectively) possibly due to their higher amylose content and longer chains. Significant (p < 0.05) differences in peak, trough, final, breakdown, and setback viscosities were also observed among the starches with Koshihikari Asian rice having the highest peak viscosity (310 RVU). These differences in molecular structure and thermal properties between the ARAs and ARVs are likely to influence the cooking and eating quality of the ARAs.</abstract><cop>Weinheim</cop><pub>Verlag Chemie</pub><doi>10.1002/star.201500145</doi><tpages>11</tpages></addata></record> |
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| source | Wiley Online Library Journals Frontfile Complete |
| subjects | absorbance African rice amylose chemical structure cooking enthalpy gelatinization Gelatinization properties gels iodine melting Molecular composition nutritive value Oryza glaberrima Pasting characteristics rice Rice starch starch granules thermal properties vapors viscosity X-ray diffraction |
| title | Molecular and thermal characterization of starches isolated from African rice (Oryza glaberrima) |
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