Valorization of pineapple leaf fiber (PALF) waste : Optimization of alkali pretreatment for fermentable sugar production

Name: Khemmathin Lueangwattanapong

Organization : Kasetsart University. Faculty of Engineering

Name: Kanyarat Thaithonglang

Organization : Muban Chom Bueng Rajabhat University. Faculty of Science and Technology

Name: Jirapha Koonkonyang

Organization : Muban Chom Bueng Rajabhat University. Faculty of Science and Technology

Name: Chanya Phromchaloem

Organization : Muban Chom Bueng Rajabhat University. Faculty of Science and Technology

Name: Laksamee Muensritharam

Organization : Muban Chom Bueng Rajabhat University. Faculty of Science and Technology

Email : laksamee_biot@hotmail.com

keyword: Pineapple Leaf Fiber

; Alkali Pretreatment

; Reducing Sugar

; Waste Valorization

Abstract: Pineapples are one of the major agricultural exports in Southeast Asia, accounting for a significant portion of the global market. Since a pineapple plant only fruits once or twice in its lifetime, farmers need to clear out the remaining stems and leaves through pruning to return nutrients to soil or utilize the leaf fiber. Pineapple leaf fiber (PALF), consisting primarily of cellulose, can be used for handmade products, packaging, and reinforcing material. However, the process of extracting pineapple leaf fiber generates substantial solid waste which has yet to find promising applications beyond being left to dry on fields (producing greenhouse gases) or used as cattle feed. This study investigated the potential of waste from the pineapple leaf fiber industry for reducing sugar production using alkali pretreatment and enzymatic hydrolysis. The PALF waste was soaked in NaOH solutions of varying concentrations (0.1M, 0.15M, and 0.2M) at 121°C for 0.5 hours. The treated PALF waste was then hydrolyzed for sugar production using cellulase enzyme. Simple characterization was performed to determine total solids and volatile solids, while total sugar determination was conducted using the DNS (3,5- dinitrosalicylic acid) method. Results showed that the highest yield of total sugar was 111.67 g/L, obtained from PALF waste treated with 0.15M NaOH. Sugar was also detected during the pretreatment phase. Changes in volatile solids content could be used as an initial indicator of hemicellulose removal during alkali pretreatment. This work provides an alternative solution for PALF waste valorization through sugar production, offering both environmental and economic benefits to the pineapple industry in Southeast Asia.

King Mongkut's University of Technology North Bangkok. Central Library

Address: BANGKOK

Email: library@kmutnb.ac.th

Created: 2025

Modified: 2025-07-23

Issued: 2025-07-23

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BibliograpyCitation : In Thai Institute of Chemical Engineering and Applied Chemistry and Khon Kaen University. Faculty of Engineering. The 34th Thai Institute of Chemical Engineering and Applied Chemistry International Conference (TIChE 2025) (TIChE 2025 TIChE-BE-36). Bangkok : Thai Institute of Chemical Engineering and Applied Chemistry, 2025

eng

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