Process Optimisation of Ultrasound-Assisted Extraction of Oligosaccharides from Coconut Husk

Table 1

Experimental factors and corresponding levels used.

Notation	Factor	Unit	Low	Mean	High
X1	Extraction temperature	°C	30	40	50
X2	Extraction time	min	5	25	45
X3	Ultrasonicator power	Watt	25	137.5	250
X4	Sodium hydroxide concentration	% w/v	1	6.5	12
X5	Solid-to-liquid ratio	—	50	100	150