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1 – 10 of over 3000A.M.A. Nada, A.M.M. El‐Masry, A.M.M. El‐Torky and Yehia E.A. Abd El‐Aziz
The purpose of this paper is to study some chemical reactions of viscose grade pulp (alpha cellulose around 96 per cent) prepared by preoxyacetic acid pulping of bagasse for the…
Abstract
Purpose
The purpose of this paper is to study some chemical reactions of viscose grade pulp (alpha cellulose around 96 per cent) prepared by preoxyacetic acid pulping of bagasse for the preparation of some cellulose derivatives.
Design/methodology/approach
Viscose grade pulp was prepared by using ecological chemicals. The viscose grade pulp was subjected to some chemical reactions (e.g. carboxymethylation, cyanoethylation and phosphorylation reactions). The pulping and bleaching which are two important stages involved in the complex process of converting fibrous raw material (bagasse) into viscose grade pulp are also investigated in this paper.
Findings
The viscose pulp prepared by peroxyacid pulping of bagasse was subjected to a number of chemical reactions such as: hydrogel and fibrous carboxymethyl cellulose; cyanoethyl cellulose, in which this cyanoethylcellulose (of gel properties) was prepared, the hydrophobic character of the cyanoethylcellulose was changed into hydrophilic character via hydrolysis by NaOH (2.5 per cent w/v) which converts some of the CN groups into COOH; and cellulose phosphate. Infrared spectroscopy of these derivatives was studied. New bands were observed at 3,120, 2,251, 1,200 and 980 cm−1 which characterised to groups, respectively.
Originality/value
The paper documents the preparation of some cellulose derivatives which have high water absorption and can be used as hydrogel materials such as carboxymethyl and hydrolysed cyanoethyl cellulose and ion exchange properties.
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Enrico Baraldi and Torkel Strömsten
The role of management control has not received sufficient attention in the literature on value creation so far. Therefore, this paper aims to investigate the role of control in…
Abstract
The role of management control has not received sufficient attention in the literature on value creation so far. Therefore, this paper aims to investigate the role of control in value creation in industrial networks. More specifically, the aim is to examine the management and control of interfaces between key resources within and between firms, in the networks surrounding firms, when they attempt to create value. All the firms that take part in a value-creation process have both formal and informal control systems: these firms have budgets, specific routines, reward systems, and sanctioned “ways to behave.” The paper relates the Industrial Marketing and Purchasing (IMP) group's research on interaction, relationships, and networks with control literature, and presents a framework for controlling resource interfaces in a network setting. Two in-depth cases illustrate the role of control in value creation. The first case covers the development of a low-weight newspaper grade that Holmen and its paper mill Hallsta initiated. The second case examines the attempt to develop and commercialize a new, energy efficient pulping technology.
E.S. Abd El‐Sayed and A.H. Basta
This study examines the effects of using magnesium chloride as a precipitating agent of sodium silicate on the mechanical, optical and fire retardant properties of the resulting…
Abstract
This study examines the effects of using magnesium chloride as a precipitating agent of sodium silicate on the mechanical, optical and fire retardant properties of the resulting paper sheets. Two types of treatments (internal and external), were carried out to investigate such effects on the paper sheets prepared from wood pulp and from non‐wood fibrous, bagasse pulp. The results obtained showed that the treatment of paper sheets with either sodium silicate or sodium silicate‐magnesium chloride led to a decrease in the activation energy of the initial main degradation stages. Wood pulp‐paper sheets treated with sodium silicate showed better fire retardant properties than the sodium silicate‐magnesium chloride treated wood pulp‐paper sheets. A reverse trend was noted in the case of paper sheets made from bagasse pulp.
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Aaqib Nisar, Nusrat Jan, Amir Gull, Farooq Ahmad Masoodi, Tawheed Amin, Omar Bashir and Sajad Mohd Wani
The demand for functional foods has been increasing tremendously throughout the globe and keeping in view the health beneficial properties of apricot fruit. The purpose of this…
Abstract
Purpose
The demand for functional foods has been increasing tremendously throughout the globe and keeping in view the health beneficial properties of apricot fruit. The purpose of this study is to develop wheat flour based cookies enriched with apricot pulp powder in order to improve nutraceutical properties of cookies and dilution of gluten at the same time.
Design/methodology/approach
Cookies were prepared from wheat flour blended with apricot pulp powder at 0, 10, 15, 20 and 25% level and evaluated for proximate, functional, rheological, nutraceutical and sensory properties.
Findings
Fibre content of apricot powder-incorporated cookies (3.23%) was significantly (p < 0.05) higher at 25% level than control (1.64%). The water absorption and oil absorption capacities decreased significantly (p < 0.05) upon increasing level of apricot pulp powder. The ß-carotene content, antioxidant activity and total phenolic content increased significantly (p < 0.05) upon incorporation of apricot pulp powder. The thickness of cookies increased, however, diameter and spread ratio decreased with increase in the levels of apricot pulp powder. Lightness (L*) value decreased, while redness (a*) and yellowness (b*) increased when incorporated with apricot pulp powder. Cookies having 25% apricot pulp powder showed maximum hardness and overall acceptability.
Originality/value
To the best of our knowledge, the scientific literature on incorporation of apricot pulp powder in bakery products is scanty. As such the present research has a tremendous scope for the food industries to produce functional bakery products with antioxidant properties and diluted the gluten content at the same time.
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Herianus Justhianus D. Lalel, I. Nyoman Widiarta Mahayasa, Zulianatul Hidayah and Kartiwan Kartiwan
The purposes of this paper are to determine the nutritional composition of the pulp and its antioxidant activity; study the effect of drying and storage on the nutritional…
Abstract
Purpose
The purposes of this paper are to determine the nutritional composition of the pulp and its antioxidant activity; study the effect of drying and storage on the nutritional composition and antioxidant of the pulp; investigate the effect of de-bittering using fermentative microbes, sodium carbonate and polyethylene glycol (PEG) on antioxidant of the pulp, and to study the shelf-life and sensory evaluation of de-bittered pulp products.
Design/methodology/approach
The ripe fruits of palmyra (Borassus flabellifer L) were collected around Kupang city, Indonesia. The pulp was extracted with different techniques. The fresh pulp was directly analyzed for its nutritional and antioxidant properties. The rest of the pulp was de-bittered, dried and used for further treatments and products development. The de-bittered pulp was used to make chips, stick cracker, and jelly sweet. Fresh products were sensory evaluated by 30 semi-trained panelists. For shelf-life analysis, products were wrapped and/or packed with different thickness of food grade plastic, plastic-alumina foil, or mica stopples and kept at different temperatures (30, 40 and 50oC) for one month.
Findings
The fresh pulp contains carotenoids (609.10 mg per kg of pulp), vitamin C (461.40 mg per kg of pulp), polyphenols (270 mg per kg of pulp) and anthocyanin (53.90 mg per kg of pulp). Free radical scavenging activity of the dried pulp (water content of 11.60 percent) was 93.4 percent. Several techniques including fermentation, sodium carbonate, and PEG treatment have been successfully developed to reduce the bitterness of the pulp without significantly reducing its antioxidant activities. Food products (chips, stick cracker, and jelly sweet) have then been developed and have got positive response from panelist.
Research limitations/implications
Pulp of fruit is a potential source of antioxidants, i.e. carotenoids (pro vitamin A), vitamin C, and polyphenols. The pulp potentially can be used in fresh and dried form for functional food. The bitterness of the pulp can be significantly reduced using fermentation, sodium carbonate or PEG treatment. The pulp can be utilized for producing chips, crackers, and semi moist food products.
Practical implications
First, pulp of the palmyrah fruit can be easily extracted using water. Second, the bitterness of the pulp can be reduced by using traditional fermentation starter. Third, many type of food products can be developed using the palmyrah pulp.
Social implications
This effort offers opportunity for farmers to optimize the use of palmyrah pulp for functional food. It will provide new jobs and increase the income of farmer at East Nusa Tenggara Province.
Originality/value
The study has revealed that pulp of palmyrah fruit is a source of antioxidants: carotenoids (pro vitamin A), vitamin C, and polyphenols. The pulp potentially can be used in fresh and dried form for functional food. The bitterness of the pulp can be significantly reduced using fermentation, sodium carbonate, and PEG. The pulp can be utilized for producing chips, crackers, and semi moist food products.
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Shaffic Ssenyimba, Julia Kigozi, Peter Tumutegyereize, John H. Muyonga and Raymonds Mutumba
Refractance window drying (RWD) has been identified as the method that can give high-quality products at a relatively low production cost. However, knowledge about its use and…
Abstract
Purpose
Refractance window drying (RWD) has been identified as the method that can give high-quality products at a relatively low production cost. However, knowledge about its use and adoption remains lacking both in academic curricula and industry in the developing world.
Design/methodology/approach
A lab-scale batch RWD of a closed-loop control system was designed, fabricated and evaluated for drying rates, evaporation rate, the energy of evaporation, energy efficiency and throughput. Testing was done using mango and tomato pulps.
Findings
Drying rates at 95°C of 1.32 gg−1min−1 and 0.854 gg−1min−1 at 2 and 3 mm, respectively, for tomato, 0.6 gg−1min−1 and 0.33 gg−1min−1 at 2 and 3 mm for mango pulp were obtained. The dryer had an evaporation rate of 4.63 × 10–4 kg/s and 4.25 × 10–4 kg/s, the energy of evaporation of 1.05 kW and 0.96 kW and thermal energy efficiency of 25.64% and 21.73% while drying tomato and mango pulps, respectively. Dryer throughput of 0.6 kg/h of dried mango Pulp and 0.47 kg/h of dried tomato pulp was obtained.
Originality/value
The designed RWD can be adequately used in laboratory experiments on different products to produce powders. This will enable the transfer of knowledge about RWD technology in developing countries.
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The purpose of this paper is to investigate optimal strategic decision alternatives for Finnish pulp production companies in response to rising export tariffs on Russian…
Abstract
Purpose
The purpose of this paper is to investigate optimal strategic decision alternatives for Finnish pulp production companies in response to rising export tariffs on Russian roundwood. Traditionally, increasing the domestic or Russian supply to pulp mills satisfied their wood requirements. However, once this conventional strategy could no longer be implemented (in 2008), the wood requirements were met by adjusting pulp production (reducing) and wood procurement (increasing domestic procurement).
Design/methodology/approach
As the primary research data for the study, the procurement situation in 2005 was used to describe the conventional business strategy for purchasers of Russian or domestic roundwood. Possible business strategies were then simulated for changing pulp production by Stora Enso, with the goal of adjusting roundwood requirements, to develop a globally‐optimal strategy to solve the procurement problem.
Findings
After removing production by the northernmost Finnish pulp mill, the authors could not find a globally optimal solution for the wood‐procurement problem. It was found that Russia's tax policy (high export tariffs on roundwood) will have large implications for Finnish wood procurement (i.e. the use of domestic wood vs imported Russian roundwood), and can dramatically change the basis, type, and location of pulp mills. The reduction or total elimination of imported Russian roundwood caused severe supply shortages and reduced pulp production.
Originality/value
Based on the results of analysis, the authors recommend adjustment methods to assist strategic wood‐procurement decisions, given the need to adapt wood‐procurement logistics to an unpredictable and complicated pulp production environment that requires continual optimization of the wood flow.
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Mairi N. McKinnon and Brad S. Long
The motivation for this paper comes from Canada’s Truth and Reconciliation’s (TRC) Calls to Action, and in particular, the call for more meaningful consultation and respectful…
Abstract
Purpose
The motivation for this paper comes from Canada’s Truth and Reconciliation’s (TRC) Calls to Action, and in particular, the call for more meaningful consultation and respectful, consent-based relationships between businesses and Indigenous communities in Canada. To this end, this study empirically examines leadership in the context of a wicked problem faced by a pulp and paper mill and suggest an Indigenous epistemology as helpful to inform the leadership behaviours employed in this company.
Design/methodology/approach
Firstly, this study established that the problem faced by the company aligns with the characteristics of wicked problems, hence necessitating a collective leadership approach. This study then compiled a database from publicly available documents and inductively coded this data to identify themes that told us something about the leadership behaviours employed by the company as it attempted to resolve the problem at hand.
Findings
This study provides evidence that the company did not employ collective leadership when attempting to tame its wicked problem. It then shows that the context in which the firm operates lends itself well to the Mi’kmaw concept of Two-Eyed Seeing as a guiding principle that could have informed the company’s leadership and contributed to a long-overdue process of reconciliation. This study proposes several specific actions that plausibly could have helped produce such an outcome.
Originality/value
This paper helps fill a void in applications of the wicked problem construct to businesses. Further, this study suggests that the problem faced by this firm remained difficult to tame precisely because it failed to employ a collective leadership approach. The contribution to the leadership literature comes from introducing Two-Eyed Seeing and showing how it may help produce leadership that is inherently more collective in nature. Beyond its instrumental value, this approach may nurture more consent-based relationships between businesses and Indigenous communities in Canada, as called for by the TRC, hence contributing to reconciliation with a long-suffering neighbouring Indigenous community.
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Adrielle Borges de Almeida, Anna Karoline Carmo Silva, Ariadne Ribeiro Lodete, Mariana Buranelo Egea, Mayra Conceição Peixoto Martins Lima and Fabiano Guimarães Silva
The purpose of this study was to evaluate six different fruits from the Cerrado as to their chemical and bioactive properties.
Abstract
Purpose
The purpose of this study was to evaluate six different fruits from the Cerrado as to their chemical and bioactive properties.
Design/methodology/approach
Six different fruits from the Cerrado (araticum, baru, jatoba-do-cerrado, lobeira, macauba and pequi) were characterized regarding moisture, ash, lipids, proteins, carbohydrates, carotenoids, chlorophyll, ascorbic acid, flavonoids, phenolic compounds and their antioxidant activities.
Findings
The highest flavonoid content, which was found in araticum pulp, was significantly different from the ones of other fruit pulps. The carotenoid content of pequi pulp was 12-fold the one of lobeira pulp. The vitamin C content of baru pulp was five-fold the Reference Daily Intake (RDI). In relation to the antioxidant activity, araticum (5.7 µM/g) and jatoba (5.2 µM/g) pulps exhibited the highest values (p < 0.01). Both baru and araticum pulps were capable of capturing the radical with mean percentage of discoloration of 68.7 and 67.4%, respectively (p < 0.01).
Originality/value
Native fruits of the Cerrado have been poorly described in the literature, even though they are highly consumed in the region. Publicizing their nutritional characteristics can increase the commercial value of these fruits, which have been traditionally devalued. In addition, knowledge of new sources of nutrients contributes to their use by pharmaceutical and food industries.
A.E.‐S.I. Ahmed, A.M. El‐Masry, A. Saleh and A. Nada
The purpose of this paper is to prepare and optimize the preparation conditions of some new hydrogels and in addition, evaluate their water absorbance at different mediums and…
Abstract
Purpose
The purpose of this paper is to prepare and optimize the preparation conditions of some new hydrogels and in addition, evaluate their water absorbance at different mediums and their ability to remove ions from aqueous solutions.
Design/methodology/approach
Cellulose was extracted from depithed bagasse at two different pulping conditions; 3 and 6 hours cooking times, pulp (I) and (II), respectively. These pulps, in addition to cotton linter for comparison, were grafted with acrylamide followed by cross‐linking with glutaraldehyde. The networks were partially hydrolyzed and the structures of products (before and after hydrolysis) were studied using FTIR, SEM, TGA and X‐ray. The optimum preparation conditions were identified, before and after hydrolysis, to achieve maximum absorbance and the ability of prepared hydrogels to remove ions from solutions was investigated.
Findings
Maximum level of absorption was recorded using hydrogels prepared with monomer concentration =0.8 mol/l, cross‐linker concentration =0.01 mol/l, reaction time =2 hours and temperature =65°C. Hydrogels prepared using pulp (I) showed the best absorbance behavior and a tendency to remove ions from water.
Research limitations/implications
The ability of the prepared gels to remove ions from water could be further investigated to evaluate the ability of their use in a multi‐filtration system for water treatment.
Practical implications
This piece of work has suggested a simple way to convert an agricultural waste to hydrogel able to remove metal ions from water.
Social implications
Consuming this type of waste reduces the risks resulting from its burning in some countries, such as Egypt, that produce large amounts of it.
Originality/value
In this paper, low cost hydrogels, with expected value in water treatment, were prepared using agricultural wastes. They have shown better reactivity than gels prepared using pure cellulosic materials (cotton linter).
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