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Journal articles
Magazine articles
Evaluation of rice straw for purification of lovastatin, TAPPI Journal November 2021
ABSTRACT: Cholesterol synthesis in the human body can be catalyzed by the coenzyme HMG-CoA reductase, and lovastatin, a key enzyme inhibitor, can reduce hypercholesterolemia. Lovastatin can be obtained as a secondary metabolite of Aspergillus terreus ATCC 20542. In this study, rice straw of lignocellulose was used in aeration and agitation bath fermentation in a 1-L flask, and a maximal crude extraction rate of 473 mg/L lovastatin was obtained. The crude extract was treated with silica gel (230•400 mesh) column chromatography. Ethyl acetate/ethanol (95%) was used as the mobile phase, and isolation was performed through elution with various ethyl acetate/ethanol ratios. The highest production rate of 153 mg/L was achieved with ethyl acetate/ethanol in a ratio of 8:2. The lovastatin gained from the crude extract was added to 12 fractions treated with 0.001 N alkali, and acetone was then added. After 24 h of recrystallization at 4°C, the extract underwent high-performance liquid chromatography. The purity had increased from 25% to 84.6%, and the recovery rate was 65.2%.
Journal articles
Magazine articles
Kraft pulp viscosity as a predictor of paper strength: Its uses and abuses, TAPPI Journal October 2023
ABSTRACT: For bleached kraft pulps, two factors govern paper strength: the individual fiber strength, and the bond strength that adheres the individual fibers together in the paper matrix. Inherent fiber strength is related to the length of the carbohydrate polymers, also known as the degree of polymerization (DP). Average DP (DP) is inferred by performing pulp viscosity measurements. Under certain circumstances during kraft pulping and bleaching, the average polymer lengths can be shortened, resulting in lower pulp viscosity, and may indicate fiber damage. Fiber damage typically manifests itself as a reduction in tear strength for well-bonded handsheets.This paper will review the literature on how pulp viscosity can predict paper/fiber strength and how it can be used as a diagnostic tool. It can be a means to monitor pulp quality during pulping and bleaching, as well as to alert when such operations approach a critical threshold. However, viscosity losses must be carefully and judiciously analyzed. Like most diagnostic tools, viscosity measurements can be misused and abused, which can lead to incorrect inferences about intrinsic fiber strength. This review will also cover these misuses. The overall goal is to provide the papermaker a better understanding of what pulp viscosity is, how it correlates to potential sheet strength, and what its limitations are. It will be illustrated that when pulp viscosity drops below a critical value, it will indicate an appreciable deterioration in the paper’s tear and tensile strength.
Journal articles
Magazine articles
Incorporation of post-consumer pizza boxes in the recovered fiber stream: Impacts of grease on finished product quality, TAPPI Journal March 2021
ABSTRACT: Grease and cheese contamination of used pizza boxes has led to misunderstanding and controversy about the recyclability of pizza boxes. Some collection facilities accept pizza boxes while others do not. The purpose of this study is to determine whether typical grease or cheese contamination levels associated with pizza boxes impact finished product quality. Grease (from vegetable oil) and cheese are essentially hydrophobic and in sufficiently high concentration could interfere with interfiber bonding, resulting in paper strength loss.Findings from this study will be used to determine the viability of recycling pizza boxes at current and future con-centrations in old corrugated containers (OCC) recovered fiber streams. These findings will also be used to inform the acceptability of pizza boxes in the recycle stream and educate consumers about acceptable levels of grease or cheese residue found on these recycled boxes.
Journal articles
The outer limits of paper recovery and recycling, TAPPI JOURNAL, April 1997, Vol. 80(4)
The outer limits of paper recovery and recycling, TAPPI JOURNAL, April 1997, Vol. 80(4)
Journal articles
Clonal forestry and genetic engineering: where we stand, future prospects, and potential impacts on mill operations, TAPPI JOURNAL, February 1998, Vol. 81(2)
Clonal forestry and genetic engineering: where we stand, future prospects, and potential impacts on mill operations, TAPPI JOURNAL, February 1998, Vol. 81(2)
Journal articles
Champion international's long log pine chip mill: a nontraditional approach, TAPPI JOURNAL, February 1998, Vol. 81(2)
Champion international's long log pine chip mill: a nontraditional approach, TAPPI JOURNAL, February 1998, Vol. 81(2)
Journal articles
A man of ideas: 1998 Gunnar Nicholson Gold Medalist Douglas Wahren, TAPPI JOURNAL, February 1998, Vol. 81(2)
A man of ideas: 1998 gunnar nicholson gold medalist douglas wahren, TAPPI JOURNAL, February 1998, Vol. 81(2)
Journal articles
It's a dirty job, TAPPI JOURNAL, August 1996, Vol.79(8)
It's a dirty job, TAPPI JOURNAL, August 1996, Vol.79(8)
Journal articles
Energy reduction at a kraft mill: examining the effects of process integration, benchmarking, and water reduction, TAPPI JOURNAL & Solutions! March 2005, Vol. 4(3)
Energy reduction at a kraft mill: examining the effects of process integration, benchmarking, and water reduction, TAPPI JOURNAL & Solutions! March 2005, Vol. 4(3)
Journal articles
Arundo donax l. reed: new perspectives for pulping and bleaching 1. raw material characterisation, TAPPI JOURNAL, January 2001, Vol. 84(1)
Arundo donax l. reed: new perspectives for pulping and bleaching 1. raw material characterisation, TAPPI JOURNAL, January 2001, Vol. 84(1)
