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Sweetpotato

  • Based on several hundred reference values, NIRS calibrations were developed to estimate ß-carotene, iron, zinc, protein, starch, glucose, fructose, sucrose and maltose in freeze dried and milled root sweetpotato samples, as well as in fresh root samples.
  • The ß-carotene, iron and zinc calibrations for freeze dried and milled material as well as those for protein, starch and sugars are highly precise and are useful for selecting varieties with high, medium and low concentrations of these components. Applied NIRS calibrations for freeze dried sweetpotato samples are being extended by including 100 samples from different environments and with different flesh colors per year.

  • NIRS calibrations for fresh storage roots are highly accurate in predicting dry matter, starch and sugars but not ß-carotene, iron and zinc. Hence we concluded that NIRS is useful to select for the micronutrient complex ß-carotene, iron and zinc, provided that freeze dried samples are used.
In 2008, more than 23,000 sweetpotato storage root samples from different projects have been analyzed by NIRS at CIP for protein, starch, glucose, fructose, sucrose, maltose, ß-carotene, iron and zinc.

Sweetpotato Network

NIRS calibrations for protein, starch, glucose, fructose, sucrose, maltose, ß-carotene, iron and zinc in freeze dried and milled sweetpotato samples have been developed by using samples from different environments and are ready to be used in a sweetpotato NIRS-network. The environments used were: San Ramon (wet tropics, Central Peru), La Molina (arid pacific coast, Central Peru), Chiclayo (arid pacific coast, North Peru), Canete (arid pacific coast, Central Peru) and samples from different environments in Africa and Asia.
The NIRS calibrations for freeze dried and milled sweetpotato samples have already been installed on the NIRS equipment at NARO (National Agricultural Research Organization) in Namulonge, Uganda and are applied for routine analysis. They will also be used to analyze freeze dried sweetpotato material from Maputo, Mozambique. CIP-Mozambique will install NIRS equipment during 2010.