Effect of Dilute Sulfuric Acid Hydrolysis of Coconut Dregs on Chemical and Thermal Properties

Bujang, Normah; Rodhi, Miradatul Najwa Muhd; Musa, M.Z.; Subari, Fuzieah; Idris, Norazlina; Makhtar, Nurul Shuhada Mohd; Hamid, Ku Halim Ku

doi:10.1016/j.proeng.2013.12.194

Cited by 18 publications

(7 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Hence, an appropriate hydrolysis time is crucial to avoid the degradation of glucose. Bujang et al ( 2013 ) reported 0.38 g/L glucose was hydrolysed from coconut dregs sample only after 30 min incubation with 1% sulfuric acid at 130 °C whilst 48 h was required to obtained 0.2 g/L glucose at 50 °C in this study. These results showed that besides incubation time, incubation temperature also plays a role in the acid hydrolysis rate of coconut dregs.…”

Section: Discussionmentioning

confidence: 52%

Utilization of acid pre-treated coconut dregs as a substrate for production of detergent compatible lipase by Bacillus stratosphericus

et al. 2017

View full text Add to dashboard Cite

In recent years, many efforts have been directed to explore the methods to reduce the production costs of industrial lipase by improving the yield and the use of low-cost agricultural wastes. Coconut dregs, which is a lignocellulosic by-product from coconut oil and milk processing plants, is rich in cellulose (36%) and crude fat (9%). A newly isolated Bacillus stratosphericus has been demonstrated to perform cellulose hydrolysis on coconut dregs producing fermentable sugars. The highest extracellular lipase activity of 140 U/mL has been achieved in submerged fermentation with acid pre-treated coconut dregs. The lipase was found to be active over a wide range of temperatures and pHs. The activity of lipase can be generally increased by the presence of detergent ingredients such as Tween-80, cetyltrimethylammonium bromide, hydrogen peroxide and phosphate per sulphate. The great compatibility of lipase in commercial detergents has also underlined its potential as an additive ingredient in biodetergent formulations.

show abstract

Section: Discussionmentioning

confidence: 52%

Utilization of acid pre-treated coconut dregs as a substrate for production of detergent compatible lipase by Bacillus stratosphericus

et al. 2017

View full text Add to dashboard Cite

show abstract

“…On the other hand, the results of the maximal reducing sugar (fermentable sugar) release of coconut pulp residue are comparable to other pretreated coconut pulp residues and waste. Bujang et al reported the maximum sugar release from coconut pulp residue was 0.38 g/L using 1% concentration of H 2 SO 4 at 130°C for 60 minutes 57 . Zheng et al also examined the effect of acid and enzymatic hydrolysis with optimal sugar release of 3.467 g/L and 3.224 g/L, respectively 58 .…”

Section: Resultsmentioning

confidence: 99%

“…Bujang et al reported the maximum sugar release from coconut pulp residue was 0.38 g/L using 1% concentration of H 2 SO 4 at 130 C for 60 minutes. 57 Zheng et al also examined the effect of acid and enzymatic hydrolysis with optimal sugar release of 3.467 g/L and 3.224 g/L, respectively. 58 The resulting reducing sugar (102.86 g/L) from the optimized condition of the present study was higher due to prehydrothermal treatment and subsequent treatment with alkaline (NaOH) , subsequently targeted the hemicellulose and lignin.…”

Section: Enzymatic Hydrolysismentioning

confidence: 99%

Bioethanol production from coconut pulp residue using hydrothermal and postalkaline pretreatment

et al. 2020

View full text Add to dashboard Cite

The objective of this study is to explore the feasibility of sequential hydrothermal and alkaline pretreatment in improving enzymatic hydrolysis and sugar production of coconut pulp residue for bioethanol production. Hydrothermal pretreatment with the different heating duration of 20, 40, 60 minutes yielded 32.27, 27.51, and 26.72 g/L of total sugar, respectively. After posttreatment with 1%, 2%, and 3% alkaline treatment, the further increment of almost 90% on sugar production was observed. Compared to the single pretreatment, the combination of hydrothermal and alkaline pretreatment significantly affected the enzymatic hydrolysis. The optimum condition for efficient hydrolysis was 40 minutes hydrothermal pretreatment, followed by 1% NaOH posttreatment. At these conditions, the total and reducing sugar was 257.14 ± 0.92 and 102.86 ± 0.82 g/L and the maximum ethanol achieved was 27.19 g/L on the 48 hours of fermentation with efficiency and ethanol productivity of 51.83% and 0.57 g/L/h, respectively.

show abstract

“…Hidrolisis asam sulfat merupakan salah satu proses yang umum dilakukan dalam tahapan pengolahan suatu bahan lignoselulosa, yang dimana proses hidrolisis asam dapat melarutkan penyusun dinding sel tumbuhan seperti lignin dan hemiselulosa sehingga selulosa yang diselubunginya dapat terbebas [7], selain itu hidrolisis asam juga dapat memperpendek rantai selulosa yang bertujuan agar lebih mudah dilarutkan. Karakteristik selulosa teregenerasi yang memiliki struktur kimia serupa dengan selulosa asli berpotensi menyebabkan bioplastik yang dihasilkan akan memiliki sifat dan karakteristik yang serupa dengan selulosa native, diantaranya akan berpengaruh pada sifat mekanik sangat dipengaruhi oleh interaksi yang terjadi antar rantai yang menyusunnya.…”

Section: Pendahuluanunclassified

Pengaruh Variasi Konsentrasi Hidrolisis Asam Sulfat Terhadap Sifat Me-kanik Plastik Selulosa Teregenerasi dari Kapas Limbah Tekstil dengan Pelarut NaOH/Urea

Rizkiansyah

Mardiyati

Steven

2018

JUSAMI

View full text Add to dashboard Cite

ABSTRAK PENGARUH VARIASI KONSENTRASI HIDROLISIS ASAM SULFAT TERHADAP SIFAT MEKANIK PLASTIK SELULOSA TEREGENERASI DARI KAPAS LIMBAH DENGAN PELARUT NaOH/UREA. Selulosa merupakan polimer alami dengan ketersediaan yang paling melimpah yang berpotensi untuk direkayasa menjadi suatu plastik biodegradable. Selulosa teregenerasi merupakan suatu material yang dibentuk dengan cara melarutkan selulosa dalam palarut tertentu dan dicetak. Dalam penelitian ini, kapas limbah dari industri tekstil digunakan sebagai sumber selulosa. Kapas pada dasarnya memiliki kandungan selulosa yang sangat tinggi, yakni sekitar 86 % hingga 98 %. Selulosa diekstrak dari kapas limbah dengan hidrolisis asam sulfat dengan konsentrasi divariasikan pada 0,5 M; 1M; 1,5M dan 0,5 M dengan suhu 100°C selama 2 jam. Selulosa teregenerasi dibuat dengan melarutkan selulosa pada larutan NaOH 7 %/Urea 12 % dan dibentuk dengan metode solution casting. Berat molekul selulosa diukur dengan metode berat molekul rerata viskositas dengan viskometer Ubbelohde. Karakterisasi yang dilakukan menunjukkan peningkatan konsentrasi asam sulfat yang digunakan menyebabkan penurunan berat molekul selulosa yang terekstraksi. Berat molekul selulosa yang digunakan akan turut berpengaruh terhadap sifat mekanik dari plastik yang dihasilkan. Sifat optimum selulosa teregenerasi yang dihasilkan diperoleh dari selulosa dengan berat molekul 2,73 x 10 4 g/mol dari hasil hidrolisis 0,5 M, yang dimana memiliki kekuatan tarik, persen elongasi dan modulus masing-masing sebesar 49,24 MPa; 0,92 %; dan 11,39 GPa dengan densitas sebesar 1,53 g/cm 3 . ABSTRACT INFLUENCE OF ACID CONCENTRATION TO MECHANICAL PROPERTIES OF REGENERATED CELLULOSE PLASTIC FROM TEXTILE INDUSTRY COTTON WASTE.Cellulose is most abundant naturally occurred polymer which has potential to be engineered into biodegradable plastic. Regenerated cellulose is a class of material formed by dissolving cellulose into a certain solvent and casted into desired shape. In this research, waste cotton from textile industry are used as source of cellulose. Cotton basically have high content of cellulose, which around 86-98 %. Cellulose extracted from waste cottonusing sulfuric acid hydrolysiswith the concentration varied in 0.5; 1; 1.5 and 2 M in 100°C for 2 hours. Regenerated cellulose is prepared by dissolving cellulose with NaOH 7 wt%/Urea 12 wt% and formedby solution casting method. Molecular weight of cellulose was investigated by viscosity average molecular weight method using Ubbelohde viscometer. Characterization conducted in this research suggested that the increase of sulfuric acid concentration used in the extraction resulted with the decrease of the molecular weight of the extracted cellulose. The optimal properties of the regenerated cellulose were obtained from cellulose with molecular weight 2.73 x 10 4 g/mol extracted with sulfuric acid hydrolysis in 0,5 M, which resulted in regenerated cellulose with tensile strength, percent of elongation, and modulus 49.24 MPa; 0.92%; and 11.39 GPa resepectively and density 1.53 g/cm 3 .

show abstract

Effect of Dilute Sulfuric Acid Hydrolysis of Coconut Dregs on Chemical and Thermal Properties

Cited by 18 publications

References 21 publications

Utilization of acid pre-treated coconut dregs as a substrate for production of detergent compatible lipase by Bacillus stratosphericus

Utilization of acid pre-treated coconut dregs as a substrate for production of detergent compatible lipase by Bacillus stratosphericus

Bioethanol production from coconut pulp residue using hydrothermal and postalkaline pretreatment

Pengaruh Variasi Konsentrasi Hidrolisis Asam Sulfat Terhadap Sifat Me-kanik Plastik Selulosa Teregenerasi dari Kapas Limbah Tekstil dengan Pelarut NaOH/Urea

Contact Info

Product

Resources

About