Modification of softwood kraft pulp fibres using hydrogen peroxide at acidic conditions

Martinsson, Axel; Hasani, Merima; Potthast, Antje; Theliander, Hans

doi:10.1007/s10570-020-03245-z

Cited by 8 publications

(3 citation statements)

References 21 publications

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“…Temperatures varied between 65 and 85°C and residence times varied between 30 and 90 minutes. The results were compared to previous results obtained from oxidations of softwood pulp (Martinsson et al 2020). The rate of oxidation is fairly low below 85°C, which makes comparison difficult: comparisons with softwood pulp were therefore only made at 85°C.…”

Section: Acidic Oxidation Of Hardwood Pulpmentioning

confidence: 89%

“…Previous work (Martinsson et al 2020) has shown that the oxidation of softwood pulp using hydrogen peroxide at acidic conditions led to an increase in the formation of carbonyl groups. The utilization of a common bleaching agent, such as hydrogen peroxide, to introduce carbonyl groups could potentially open up for the large-scale production of a pulp with inherent wet-strength, without the need for the further addition of wet-strength agents, in some applications.…”

Section: Introductionmentioning

confidence: 97%

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Hardwood kraft pulp fibre oxidation using acidic hydrogen peroxide

Martinsson

Hasani

Theliander

2021

Nordic Pulp &Amp; Paper Research Journal

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Gaining insight into the oxidation of hardwood kraft fibres using hydrogen peroxide at mildly acidic conditions was the main aim of this study. The oxidized hardwood pulp had an increased number of carbonyl groups and, when formed into sheets, an enhanced durability in water was seen due to the formation of cross-links, known as hemiacetals. The carbonyl groups formed were found to be mainly ketones with the exception of the case with longer reaction times (60–90 minutes) at 85 °C, where aldehydes were detected. Through compositional analysis it was found that mainly xylan was oxidized, likely due to the higher amount of xylan close to the surface of the fibre wall. The influence of xylan on the oxidation process was investigated using cold caustic extraction (CCE) performed prior to oxidation. When the CCE pulp was oxidized, there was an increased rate of introduced carbonyl groups and degradation was more pronounced. This is likely due to the accessible surface area being increased, caused by the formation of pores when the lower molecular weight xylan was being extracted during CCE.

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Section: Acidic Oxidation Of Hardwood Pulpmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 97%

Hardwood kraft pulp fibre oxidation using acidic hydrogen peroxide

Martinsson

Hasani

Theliander

2021

Nordic Pulp &Amp; Paper Research Journal

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“…It is becoming apparent that NaBH4 is increasingly being used as a reducing agent in multi-stage bleaching. NaBH4 reduces carbonyl groups to alcohol groups and improves reflectivity over a wider range than sodium or zinc hydrosulfite (Çiçekler et al, 2022;Ferrandin-Schoffel et al, 2023;Martinsson et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Sodyum borhidrürün Pinus brutia Ten ve buğday sapı hamurlarının peroksit ağartması üzerindeki etkileri

ÇİÇEKLER,

TUTUŞ

2023

Turkish Journal of Forestry | Türkiye Ormancılık Dergisi

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The addition of sodium borohydride (NaBH4) to peroxide bleaching has been investigated for its effects on the bleaching yield, mechanical and optical properties of Pinus brutia and wheat straw pulps. The pulps were subjected to four different bleaching conditions by adding charges of NaBH4 at 0%, 0.5%, 1.0%, and 1.5%, while keeping a constant hydrogen peroxide charge of 7%. The use of NaBH4 in the peroxide bleaching processes of the two pulps increased the bleaching yields. The results show that the addition of NaBH4 significantly improved the mechanical properties of the pulps, including tensile and burst indices. The optical properties of the pulps were also improved with the addition of NaBH4. The increase in mechanical and optical properties can be attributed to the reduction of residual hydrogen peroxide and the removal of metal ions, while the decrease in yellowness is due to the removal of metal ions that can cause oxidative degradation of the pulp. The findings of this study suggest that the addition of NaBH4 as an additive in peroxide bleaching is a promising approach to improve the mechanical and optical properties of P. brutia and wheat straw pulps, which can be further explored in future research.

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Paper‐Based Device for Phenolic Content Determination in Tea Extracts

Silver,

Noviana,

Ash Shiddiq

et al. 2024

Phytochemical Analysis

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IntroductionPhenolic compounds garner interest in developing medicines, nutraceuticals, and cosmeceuticals based on natural products. The quantity of phenolic compounds in a sample is commonly determined via spectrophotometry; however, this instrumented technique is relatively laborious and time consuming and requires a large amount of reagents.ObjectiveThis work aimed to develop a simple, point‐of‐need colorimetric sensor to rapidly determine total phenolic content (TPC) in tea extracts.MethodologyWe developed a radial paper‐based analytical device (PAD) for TPC determination based on the established colorimetric reaction between the Folin–Ciocâlteu reagent and phenols. The PAD was designed to enable quantitative (with image capturing device and color processing software) and semiquantitative (using a color palette reference card) determinations. Analytical performance and stability of the PAD were evaluated based on the color responses.ResultsThe PAD was successfully applied for the determination of phenolics in tea extracts obtained using several polar protic solvents, including water, methanol, and ethanol, with satisfactory accuracy (recovery of 95.5%–104%, 110%–116%, and 104%–110%, respectively) and precision (RSD < 9%). The obtained TPC values also agreed with those from visible spectrophotometry. Semiquantitative determination using the color reference card with three categories of TPC level (i.e., 0–100, 100–500, and 500–1000 mg gallic acid equivalent/L) provided > 95% accuracy. The devices were the most stable when stored at 4°C in a light‐protected, vacuum‐sealed container. The proposed PAD is promising for simple, rapid (~10–20 min), and accurate estimation of TPC in plant extracts.

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Modification of softwood kraft pulp fibres using hydrogen peroxide at acidic conditions

Cited by 8 publications

References 21 publications

Hardwood kraft pulp fibre oxidation using acidic hydrogen peroxide

Hardwood kraft pulp fibre oxidation using acidic hydrogen peroxide

Sodyum borhidrürün Pinus brutia Ten ve buğday sapı hamurlarının peroksit ağartması üzerindeki etkileri

Paper‐Based Device for Phenolic Content Determination in Tea Extracts

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