Issue: Số 24 - Tháng 8 - 2026Hóa học - Công nghệ thực phẩm
Extraction and recovery of lignin from pineapple leaves and its preliminary application as a paper additive
Published: September 16, 2026
Abstract
This study investigates lignin extraction and recovery from pineapple leaves (Ananas comosus) using sodium hydroxide combined with hydrogen peroxide and evaluates the recovered lignin as a paper additive. Pineapple leaves contained 34.8% cellulose and 20.6% lignin. The selected pretreatment conditions were 2% NaOH in 1% H₂O₂, a reagent-to-solid ratio of 2:1, 4.5 hours at 25–28°C, and agitation at 150 rpm, achieving a lignin removal yield of 32.84%. The resulting liquor contained approximately 6 mg/mL lignin. Acidification at pH 4 and 70°C for 60 minutes achieved a recovery yield of 92.21%. FTIR analysis confirmed characteristic lignin functional groups. Preliminary papermaking tests indicated that the recovered lignin could function as a binding additive, although paper quality requires further improvement.
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