A study on using coffee grounds as the material for oil extraction and lingzhi mushroom growing

Abstract

The coffee grounds from consumers and industrial productions at Vinacafe Bien Hoa Joint Stock Company were used as the material for oil extraction and lingzhi mushroom growing. The results showed that the coffee grounds had average oil content approximately19.1- 21.1%. Coffee oil contains many kinds of fatty acids with different carbon chain length from C6 to C24. Of those fatty acids, palmitic acid (C16:0), oleic acid (C18:1) and linoleic acid (C18:2) were present in large content. Lingzhi mushrooms showed the capability of firmly spreading their fine threads on the substrate of spent coffee grounds, which was illustrated by color, length and depth of the threads. The speed of shaping and growing of lingzhi mushroom spores on the substrate of spent coffee grounds was faster than on the control substrate in laboratory conditions. Moreover, no sample of lingzhi mushroom spore contained caffeine.