Comparison of the Delignifiability and Hydrolysability of Wheat Straw and Corn Stover in Aqueous Ammonia Pretreatment

Abstract

The impact of an aqueous ammonia pretreatment on the structural properties, delignifiability, and hydrolysability of wheat straw and corn stover was investigated. The results showed that the aqueous ammonia pretreatment had an excellent delignification ability and that the corn stover exhibited higher susceptibility to an aqueous ammonia attack than wheat straw. In total, 35.6% and 70.0% of the lignin in wheat straw and corn stover were removed, respectively, by the aqueous ammonia pretreatment at 75 ºC with 21% ammonia and a solid:liquid ratio of 1:10 for 20 h. Both lignin and polysaccharides in the corn stover exhibited higher susceptibility to aqueous ammonia than those in wheat straw. In addition, the hydrolysability of corn stover was more susceptible to aqueous ammonia than it was to wheat straw. A chemical structure analysis of different substrates showed that the aqueous ammonia pretreatment removed lignin, broke ester bonds between lignin and hemicelluloses, increased the specific surface area and crystallinity index, and, finally, enhanced the hydrolysis yield.

Perlakuan Biologis Dengan Memanfaatkan Fungi Untuk Meningkatkan Kualitas Pakan Ternak Asal Limbah Pertanian.

“…Perbedaan jumlah kandungan biomassa lignoselulosa kemungkinan disebabkan oleh umur limbah jerami karena kandungan dinding sel jerami terutama lignin bertambah dengan meningkatnya umur tanaman. Kemungkinan yang lain adalah jenis tanah (Speratti et al, 2017), jenis limbah tanaman, spesies tanaman, serta metode yang digunakan untuk analisa komposisi biomassa lignoselulosa (Carere et al, 2008;Jia et al, 2013;Niu et al, 2016). Tabel 1. memperlihatkan tingginya kandungan selulosa dan hemiselulosa yang merupakan dua komponen utama fraksi serat dan keduanya mempunyai keterikatan erat serta sangat bermanfaat bila bahan tersebut dicerna oleh mikroba rumen tetapi menurut Van Soest (1985) kedua komponen tersebut sulit dicerna oleh mikroba rumen.…”

Delignification and hydrolyzation of mycorrhizal black locust biomass pretreated with aqueous ammonia

“…The samples after Soxhlet extraction were hydrolyzed with 72% sulfuric acid (Luoyang Chemical Reagent Factory, China) for 1 h and then autoclaved after being diluted to 4% sulfuric acid for 1 h at 121 °C. The autoclaved samples were filtered, and the dried residue was weighed to determine the Klason lignin content (Jia et al 2013).…”

“…The solid was recovered using a filtration cloth and washed with distilled water until the pH of the filtrate was between 6 and 7. Then, the solid was air-dried and stored at -18 °C (Jia et al 2013).…”

Differences in glucose yield of residues from among varieties of rice, wheat, and sorghum after dilute acid pretreatment

“…Previous studies reported variation in sugar yields between plant species (wheat straw vs. corn stover, and wheat straw vs. water hyacinth). 5,6) In addition, transgenic approaches that change the lignin composition of the plant cell wall result in different enzymatic hydrolysis efficiencies. 7) Moreover, the biomass composition of different varieties of the same plant species differ, 8) suggesting that the yield of sugar obtained from the solid fraction after pretreatment and enzymatic hydrolysis will differ between varieties of a crop species such as rice, wheat, or sorghum.…”