The aim of this study is the evaluation of the major factors affected by operating parameters such as concentration of solvent, radiation time, ratio of microwave power to material, volume of solventon yield of products by microwave-assisted extraction. In addition, comparison between traditional extraction methods and microwave-assisted extraction is also carried out. | Vietnam Journal of Science and Technology 56 (4A) (2018) 229-237 OPTIMIZATION OF GINGER OLEORESIN EXTRACTION FROM FRESH GINGER BY USING MICROWAVE-ASSISTED ENERGY Nguyen Trung Dung*, Ta Hong Duc, Nguyen Dang Binh Thanh Hanoi University of Science and Technology, No. 1 Dai Co Viet road, Ha Noi * Email: Received: 24 September 2018; Accepted for publication: 7 October 2018 ABSTRACT Nowadays, the active compounds from natural products are interested in not only research fields but also the industrial areas. Steam distillation is widely employed for the isolation of bioactive substances from natural sources. However, the process is usually time-consuming, high energy consumption and unwanted chemicals can be entrained with the main products. Microwave-assisted extraction is now recognized as an efficient extraction technique that dramatically reduces extraction time, increases yields and higher quality of the extracts can be obtained. The aim of this study is the evaluation of the major factors affected by operating parameters such as concentration of solvent, radiation time,ratio of microwave power to material, volume of solventon yield of products by microwave-assisted extraction. In addition, comparison between traditional extraction methods and microwave-assisted extraction is also carried out. The results show that the application of microwave energy for the extraction of active substances from fresh ginger have faster heating, reduce thermal gradients and extraction time. Keywords: ginger oleoresin, microwave - assisted extraction, modeling, kinetics, response surface methodology. 1. INTRODUCTION The active compounds from natural plants can be extracted using traditional methods such as steam distillation andSoxhlet extraction, and non-traditional methods such as microwaveassisted extraction (MAE), ultrasound - assisted extraction (UAE), and supercritical fluid extraction (SFE). However, traditional methods have some disadvantages, .
