In Viet Nam, ginger (Zingiber) belonging to ginger family (Zingiberaceae) is a valuable spice plant. Ginger could be extracted for essential oil and oleoresin. After extraction, big mass of residue from ginger will be received. The ginger residue contains a lot of starch and cellulose. In this paper, we studied the methods to extract starch from residue of ginger, and used ginger sawdust for mushroom substrate. | Vietnam Journal of Science and Technology 56 (2A) (2018) 126-132 APPLICATION OF GINGER RESIDUE AFTER ESSENTIAL OIL AND OLEORESIN EXTRACTION FOR STARCH RECOVERY AND MUSHROOM SUBSTRATE REPLACEMENT Le Thi My Chau1, 2, Nguyen Thi Minh Tu2*, Tran Dinh Thang1, *, Pham Thi Huong3, Phan Thi Thao3 1 School of Technology of Chemistry, Biology and Environment, Vinh University, 182 Le Duan Street, Vinh City, Nghe An province 2 School of Biotechnology and Food Technology, Hanoi University of Science and Technology, 1 Dai Co Viet Street, Hai Ba Trung District, Ha Noi 3 54K Food technology, School of Technology of Chemistry, Biology and Environment, Vinh University, 182, Le Duan Street, Vinh City, Nghe An province * Email: , thangtd@ Received: 12 March 2018; Accepted for publication: 14 May 2018 ABSTRACT In Viet Nam, ginger (Zingiber) belonging to ginger family (Zingiberaceae) is a valuable spice plant. Ginger could be extracted for essential oil and oleoresin. After extraction, big mass of residue from ginger will be received. The ginger residue contains a lot of starch and cellulose. In this paper, we studied the methods to extract starch from residue of ginger, and used ginger sawdust for mushroom substrate. The ginger roots materials contained more than 60 % starch, from which our extraction efficiency could reach more than 30 %. The ginger sawdust was proved to be a good medium for mushroom growth with a maximum replacement rate of 60 %. Keywords: residue, ginger sawdust, starch, mushroom substrate. 1. INTRODUCTION Ginger is a classic spice of tropical Asia and Africa, widely grown in many countries from East Asia to Southeast Asia and South Asia. In Viet Nam, the trees are grown throughout the region from high mountains to plains and offshore islands [1]. Ginger is a large herbaceous plant with no shape, up to m high. This is a multi-year tree with underground stems. The rhizomes are usually branched 3-7 cm long,
