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Composition, granular structure, and pasting properties of native starch extracted from Plectranthus edulis (Oromo dinich) tubers

Tom Hellemans (UGent) , Gifty Abera Geleta (UGent) , Ingrid De Leyn (UGent) , Paul Van Der Meeren (UGent) , Koen Dewettinck (UGent) , Mia Eeckhout (UGent) , Bruno De Meulenaer (UGent) and Filip Van Bockstaele (UGent)
(2017) JOURNAL OF FOOD SCIENCE. 82(12). p.2794-2804
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Abstract
Chemical composition, granular morphology and pasting properties of native starch extracted from tubers of Plectranthus edulis were analyzed. Starch was extracted from tubers of 6 accessions collected from 4 different areas in Ethiopia. Particle size analysis (PSA) and cryo-scanning electron microscope (cryo-SEM) imaging were used to examine the granular morphology and visualize the starch paste, respectively. Pasting properties, water absorption, and gelation capacity were compared. A wide range was found for the amylose (14.2% to 23.9%), calcium (216 to 599), potassium (131 to 878), and phosphorus (1337 to 2090) contents (parts per million per dry matter). PSA showed a bimodal distribution containing small spherical (14.6 m) and large ellipse-shaped (190.4 m) granules. Major differences were found for the pasting with peak viscosities differing from 3184 to 7312 mPas. Starch from accessions Chencha and Inuka showed a difference in packing density as clearly seen through cryo-SEM image at 75% of the peak viscosity (PV), and the granular integrity was mainly responsible for the significant difference in their PV and breakdown. Principal component analysis revealed 2 distinct groups: native starch extracted from accessions at the Wolayta zone (Inuka, Lofua, and Chenqoua) and other accessions (Jarmet, Arjo white, and Chencha). The study revealed the potential of P. edulis starch for its application in food industries. However, the inherent variation due to environmental conditions on physicochemical properties of the starch needs further investigation. Practical ApplicationPlectranthus edulis is cultivated in considerable amounts throughout Ethiopia, which makes it a valuable starch source. Due to its low tendency to retrograde, it could be applied in food industry as an equivalent for the current starch sources. Moreover, the low amylose content makes it preferable for an application in refrigerated foods as this unique quality trait prevents syneresis in end products during storage. Based on the significantly higher pasting temperature of the studied P. edulis starch extracts, it can form an alternative for potato starch, which is less suitable for its use in pasteurized foods.
Keywords
amylose, cryo-SEM, Oromo dinich, Plectranthus edulis, starch, PHYSICOCHEMICAL PROPERTIES, FUNCTIONAL-PROPERTIES, MOLECULAR-STRUCTURE, POTATO STARCHES, SWEET-POTATO, WHEAT-FLOUR, AMYLOSE, CASSAVA, BLENDS, MAIZE

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Chicago
Hellemans, Tom, Gifty Abera Geleta, Ingrid De Leyn, Paul Van Der Meeren, Koen Dewettinck, Mia Eeckhout, Bruno De Meulenaer, and Filip Van Bockstaele. 2017. “Composition, Granular Structure, and Pasting Properties of Native Starch Extracted from Plectranthus Edulis (Oromo Dinich) Tubers.” Journal of Food Science 82 (12): 2794–2804.
APA
Hellemans, T., Abera Geleta, G., De Leyn, I., Van Der Meeren, P., Dewettinck, K., Eeckhout, M., De Meulenaer, B., et al. (2017). Composition, granular structure, and pasting properties of native starch extracted from Plectranthus edulis (Oromo dinich) tubers. JOURNAL OF FOOD SCIENCE, 82(12), 2794–2804.
Vancouver
1.
Hellemans T, Abera Geleta G, De Leyn I, Van Der Meeren P, Dewettinck K, Eeckhout M, et al. Composition, granular structure, and pasting properties of native starch extracted from Plectranthus edulis (Oromo dinich) tubers. JOURNAL OF FOOD SCIENCE. 2017;82(12):2794–804.
MLA
Hellemans, Tom, Gifty Abera Geleta, Ingrid De Leyn, et al. “Composition, Granular Structure, and Pasting Properties of Native Starch Extracted from Plectranthus Edulis (Oromo Dinich) Tubers.” JOURNAL OF FOOD SCIENCE 82.12 (2017): 2794–2804. Print.
@article{8543384,
  abstract     = {Chemical composition, granular morphology and pasting properties of native starch extracted from tubers of Plectranthus edulis were analyzed. Starch was extracted from tubers of 6 accessions collected from 4 different areas in Ethiopia. Particle size analysis (PSA) and cryo-scanning electron microscope (cryo-SEM) imaging were used to examine the granular morphology and visualize the starch paste, respectively. Pasting properties, water absorption, and gelation capacity were compared. A wide range was found for the amylose (14.2\% to 23.9\%), calcium (216 to 599), potassium (131 to 878), and phosphorus (1337 to 2090) contents (parts per million per dry matter). PSA showed a bimodal distribution containing small spherical (14.6 m) and large ellipse-shaped (190.4 m) granules. Major differences were found for the pasting with peak viscosities differing from 3184 to 7312 mPas. Starch from accessions Chencha and Inuka showed a difference in packing density as clearly seen through cryo-SEM image at 75\% of the peak viscosity (PV), and the granular integrity was mainly responsible for the significant difference in their PV and breakdown. Principal component analysis revealed 2 distinct groups: native starch extracted from accessions at the Wolayta zone (Inuka, Lofua, and Chenqoua) and other accessions (Jarmet, Arjo white, and Chencha). The study revealed the potential of P. edulis starch for its application in food industries. However, the inherent variation due to environmental conditions on physicochemical properties of the starch needs further investigation. 
Practical ApplicationPlectranthus edulis is cultivated in considerable amounts throughout Ethiopia, which makes it a valuable starch source. Due to its low tendency to retrograde, it could be applied in food industry as an equivalent for the current starch sources. Moreover, the low amylose content makes it preferable for an application in refrigerated foods as this unique quality trait prevents syneresis in end products during storage. Based on the significantly higher pasting temperature of the studied P. edulis starch extracts, it can form an alternative for potato starch, which is less suitable for its use in pasteurized foods.},
  author       = {Hellemans, Tom and Abera Geleta, Gifty and De Leyn, Ingrid and Van Der Meeren, Paul and Dewettinck, Koen and Eeckhout, Mia and De Meulenaer, Bruno and Van Bockstaele, Filip},
  issn         = {0022-1147},
  journal      = {JOURNAL OF FOOD SCIENCE},
  keyword      = {amylose,cryo-SEM,Oromo dinich,Plectranthus edulis,starch,PHYSICOCHEMICAL PROPERTIES,FUNCTIONAL-PROPERTIES,MOLECULAR-STRUCTURE,POTATO STARCHES,SWEET-POTATO,WHEAT-FLOUR,AMYLOSE,CASSAVA,BLENDS,MAIZE},
  language     = {eng},
  number       = {12},
  pages        = {2794--2804},
  title        = {Composition, granular structure, and pasting properties of native starch extracted from Plectranthus edulis (Oromo dinich) tubers},
  url          = {http://dx.doi.org/10.1111/1750-3841.13971},
  volume       = {82},
  year         = {2017},
}

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