Effect of chemical steeping on yields of glucose and xylose from dilute acid hydrolysis of extract from oil palm trunk

Abstract

The effectiveness of chemical steeping was examined as a novel pretreatment prior to hydrolysis to influence the extractable yield of glucose and xylose from oil palm trunk (OPT). The chemical steeping parameters were 0.2% sodium metabisulphite (w/v), 0.5% lactic acid (v/v), 26 ± 2 °C, and 1 h, followed by dilute acid hydrolysis (2%, 4%, and 6% of sulphuric acid (v/v); 115 °C, 120 °C, and 130 °C; 15 min, 30 min, and 60 min). For comparison, the glucose and xylose yield extracted from untreated OPT was also examined. Thermal analysis showed that the lactic acid and sodium metabisulphite successfully degraded the lignocellulose of OPT. The total extracted glucose and xylose yield was improved, and was approximately 2.5% to 28.8% higher than the yield extracted from non-pretreated OPT fines. RSM analysis showed that the 130 °C x 50 min x 2% was predicted as the optimum parameters for the extraction of glucose and xylose through chemically treated OPT, and followed the dilute acid hydrolysis process. Analysis of variance showed that the hydrolysis parameters were significant model terms for the glucose and xylose yield. In conclusion, chemical steeping was successful as a pretreatment to increase the extractable glucose and xylose yield from OPT.

Explorative Study of Reactive Extrusion over Nixtamalization‐Maize Pericarp Residue: Effect on Dietary Fiber, Resistant Starch, and Nixtamalized Corn Flour Tortillas

“…[ 35 ] In this case, fiber competes with starch for the limited amount of water, as occurred with amaranth flour and defatted coconut flour starch supplementation. [ 37 ] Reyes et al [ 38 ] studied the effect of starch oxidation at high temperature and observed effect on theology characteristics and carbonyl groups. This changes could be happened in residual starch present in pericarp and be affected during extrusion.…”

Lactic Acid Production from Old Oil Palm Trunk Sap in the Open Batch, Open Repeated Batch, Fed-Batch, and Repeated Fed-Batch Fermentation by Lactobacillus rhamnosus ATCC 10863

“…OPT contains fibrous materials which can be used in many industries, such as plywood, laminated veneer lumber, woodcement composites, gypsum board, pulp and paper making, animal feeds, and other value-added products [14,15]. The squeezed sap from old OPT contained mainly glucose, fructose, sucrose, and small amounts of galactose, xylose, and rhamnose, whose total amounts varied between 16.97-140 g/L [16][17][18]. Additionally, oil palm sap contains minerals, vitamins, organic acids, and amino acids [15,19].…”