Advanced green bioprocess of soil carbohydrate extraction from long-term conversion of forest soil to paddy field

Nguyen Sy Toan, Xuefei Tan, Nguyen Thi Dong Phuong, Nurul Syahirah Mat Aron, Kit Wayne Chew, Kuan Shiong Khoo, Tran Thi Ngoc Thu, Duong Thi Lim, Pham Duy Dong, Wei Lun Ang, Pau Loke Show

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15 Scopus citations

Abstract

The present research aims to study the long-term impacts of soil extractable carbohydrate content from the conversion of forest to paddy field, using three environmentally friendly methods: ultrasound assist (37 Hz/30 min), hot water (80 °C/4 h), and cold water (25 °C/30 min). Soil samples collected at the depth of 0–15 cm from natural forest, rice paddy, and border area were extracted by distilled water at the ratio 1:10 (soil: water). Contents of soil organic carbon (SOC) and extracted carbohydrate (ECH) in the natural forest and rice paddy were similar, and higher than in border area by 50%. Results showed the highest content of ECH was extracted using hot water (304–691 mg.Carbohydrate/kg soil, 4% of SOC), followed by ultrasound (102–305 mg.Carbohydrate/kg soil, 1.7% of SOC), and the lowest amount addressed to cold-water extraction (65–252 mg.Carbohydrate/kg soil, 1.2% of SOC). The ECH/SOC ratios in three soil types were the same and ranged from 0.9% to 4.2%. We conclude the long-term conversion of forest to rice paddy maintain both SOC and ECH, furthermore, hot water extraction at 80 °C/4 h is the optimum method for extraction of carbohydrate using non-chemical solvents.

Original languageBritish English
Article number106021
JournalJournal of Environmental Chemical Engineering
Volume9
Issue number5
DOIs
StatePublished - Oct 2021

Keywords

  • Carbohydrate extraction
  • Cold water
  • Hot water
  • Soil carbohydrate content
  • Ultrasound

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