Effect of high pressure pretreatment on drying kinetics and oleoresin extraction from ginger

ABSTRACT

The present study reports for the first time the effect of high pressure pretreatment (100–400 MPa, 10 min) on drying kinetics of ginger and its oleoresin extraction. High pressure pretreated samples were dried, powdered and solvent extracted. The increase in drying temperature (55–85°C) increased the moisture diffusivity (2.03–4.87 × 10⁻⁹ m²/s) but resulted in decrease in 6-gingerol (53.98%) and oleoresin yield (57.31%). However, high pressure pretreatment followed by dehydration (55°C) resulted in higher moisture diffusivity (2.84–6.09 × 10⁻⁹ m²/s) as well as enhanced extraction yield of 6-gingerol (34.05%) and oleoresin (28.29%).

KEYWORDS:

• 6-gingerol
• diffusion coefficient
• drying
• extraction
• high pressure processing
• oleoresin

Acknowledgments

The Author, Jincy M. George sincerely acknowledges the Department of Science and Technology, New Delhi, Government of India for providing the Senior Research Fellowship (INSPIRE). The authors thank Dr. Ram Rajasekharan, Director, CFTRI, Mysore for providing the required infrastructure to perform this work.