Study on the Absorption of Heavy Metal Ion Pb<sup>2+</sup> by the Low Methoxy Pectin from Sunflower Heads

PENG Xiaoxia; CUI Jingjie; LU Xiaoqing; ZHANG Libo; GENG Chunchun; GONG Qiang; YANG Liyang; DOU Zhifang

doi:10.13386/j.issn1002-0306.2021060121

Volume 43 Issue 6

Mar. 2022

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Science and Technology of Food Industry > 2022 > 43(6): 25-32. > DOI: 10.13386/j.issn1002-0306.2021060121

PENG Xiaoxia, CUI Jingjie, LU Xiaoqing, et al. Study on the Absorption of Heavy Metal Ion Pb²⁺ by the Low Methoxy Pectin from Sunflower Heads[J]. Science and Technology of Food Industry, 2022, 43(6): 25−32. (in Chinese with English abstract). doi: 10.13386/j.issn1002-0306.2021060121.

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Study on the Absorption of Heavy Metal Ion Pb²⁺ by the Low Methoxy Pectin from Sunflower Heads

College of Basic Medical Sciences, Shanxi University of Chinese Medicine, Jinzhong 030619, China

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Received Date: June 16, 2021
Available Online: January 14, 2022

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Abstract

Heavy metal pollution poses a serious threat to public health due to lacking of effective treatment methods. In order to develop new biological materials for adsorption of heavy metal ions, the natural low-methoxyl pectin (termed LAHP) was extracted from dried heads of sunflower in this study. The adsorption capacity of LAHP for Pb²⁺ in aqueous solution was studied and the conditions for the adsorptions were optimized. LAHP was extracted by oxalic acid solution at 80 ^oC and precipitated by ethanol with the yield of 14.68%±0.76%. The composition analysis showed that LAHP met the requirements of national quality standard for pectin as a food additive. The structure analysis showed that LAHP was natural low-methoxyl pectin, which was mainly composed of galacturonic acid (GalA, 86.34%) with a low degree of methyl esterification (23.93%±1.57%) and high molecular weight (257 kDa). The adsorption capacity of Pb²⁺ by LAHP was affected by the amount of pectin, pH of solution, temperature and interference ions. The optimal conditions for the adsorption of Pb²⁺ were determined as follows: pectin dosage was 30 mg/L (concentration of Pb²⁺ was 11.0 mg/L), pH of solution was 8.0, and the temperature was 30 ℃. The maximum adsorption capacity of LAHP for Pb²⁺ was 44.57±2.50 mg/g, and would be reduced to some extent affected by divalent metal ions. Therefore, the low-methoxyl pectin from sunflower heads would be a kind of natural heavy metal adsorbent, which had a wide application prospect.
- sunflower heads,
- low-methoxyl pectin,
- heavy metal,
- lead,
- adsorption capacity

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