Effect of ashing method on some micronutrients in black sesame seeds (Sesamum indicum)

Aneela Qadeer (Department of Chemistry, Federal Urdu University for Science, Arts and Technology, Karachi, Pakistan)
Humera Anwer (Department of Chemistry, Federal Urdu University for Science, Arts and Technology, Karachi, Pakistan)
Talat Mahmood (Department of Chemistry, Federal Urdu University for Science, Arts and Technology, Karachi, Pakistan)
Muhammad Abbas Bhutto (Grain Quality Testing Laboratory, Department of Agriculture, Southern Zone Agriculture Center, Pakistan Agricultural Research Council, Karachi, Pakistan)

Nutrition & Food Science

ISSN: 0034-6659

Publication date: 4 March 2014

Abstract

Purpose

Nutritional and medicinal properties of black sesame seeds (Sesamum indicum) make it very valuable in traditional system of food. Minerals in Sesamum indicum play an important role to enhance its nutritional value. The present research comprises on proximate and chemical analysis of Sesamum indicum. This study is also based on the development of ashing methods for extraction of metals in black sesame seeds. The paper aims to discuss these issues.

Design/methodology/approach

Black sesame seeds were taken from local market at Karachi-Pakistan. Proximate analysis of seeds comprises of moisture content, ash content and total metal content by EDTA titration. Digestion of this herb was done in different medium, i.e. HNO3, HCl, H2SO4 and simple ash (ash was prepared without using any acid). Atomic absorption spectroscopy was used for the analysis of metals, i.e. Fe, Zn, Cu and Mg in all these ashes.

Findings

From the results it is concluded that best medium for ashing is H2SO4, by which maximum ash (5.39±0.0021 per cent) produced. Qualitative analysis (based on Ksp values) also confirmed the presence of maximum number of metals in H2SO4 medium. Complexometric titration also revealed that maximum metal content was found to be in HCl and H2SO4 ash. Results from atomic absorption spectroscopy revealed that H2SO4 is the best method for copper (0.399±0.0001 mg/g) and iron (0.3993±0.0015 mg/g), while simple ash can extract zinc and magnesium at their maximum level.

Originality/value

This research demonstrates the best ashing method for the extraction of micronutrients, present in Sesamum indicum. These micronutrients are very beneficial for human health.

Keywords

Citation

Qadeer, A., Anwer, H., Mahmood, T. and Abbas Bhutto, M. (2014), "Effect of ashing method on some micronutrients in black sesame seeds (Sesamum indicum)", Nutrition & Food Science, Vol. 44 No. 2, pp. 102-110. https://doi.org/10.1108/NFS-05-2013-0064

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Publisher

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Emerald Group Publishing Limited

Copyright © 2014, Emerald Group Publishing Limited

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