African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6576

Full Length Research Paper

Influence of growth stage and variety on the pigment levels in Ipomoea batatas (sweet potato) leaves

Seow-Mun Hue*, Amru Nasrulhaq Boyce and Chandran Somasundram
Institute of  Biological Sciences and Centre For Research in Biotechnology For Agriculture (CEBAR), Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia.
Email: [email protected]

  •  Accepted: 29 April 2011
  •  Published: 31 May 2011

Abstract

 

The study of pigments and nutritional composition in Ipomoea batatas has been intensive, yet little studies have been conducted on their leaves. I. batatas (sweet potato) leaves which are discarded after the harvesting period can be used as a potential source of natural dye extraction due to their high level of carotenoids (particularly lutein). Selection of leaves material is dependable on factors such as leaves varieties and stages of growth developments. Variations in chlorophyll a, chlorophyll b, total carotenoids and lutein level were determined spectrophotometrically at different stages of leaves development in 6 different varieties of I.batatas leaves. Result showed that chlorophyll a, b, total carotenoids and lutein pigments increased rapidly when measured from day 1 to 7 and remained stagnant or decreased at older stages (day 15 to 18). Both the I. batatas var Oren and Biru Putih contained the highest amount of carotenoids and lutein from day 7 onwards compared to the other  varieties and thus can be used as a suitable source of natural yellow dye.

 

Key words: Ipomoea batatas, pigments, developmental stage, spectrophotometric, lutein.