Search results for "Alkaline pretreatment"

showing 2 items of 2 documents

Assessment of Postharvest Dehydration Kinetics and Skin Mechanical Properties of “Muscat of Alexandria” Grapes by Response Surface Methodology

2016

The dipping of berries in a dilute solution of sodium hydroxide during a short time was evaluated as pretreatment undertaken prior to convective dehydration of wine grapes. The impact of the sodium hydroxide content and dipping time on weight loss (WL) at different dehydration times was thoroughly assessed using central composite design (CCD) and response surface methodology (RSM). Furthermore, the effects of these two variables were also investigated on the skin mechanical properties of dehydrated grapes. The effect of these two pretreatment factors on the dehydration kinetics and skin hardness was satisfactorily fitted to regression models. The berry pretreatment with low sodium hydroxide…

Central composite designMuscat of Alexandria grapeMineralogyBerryIndustrial and Manufacturing Engineering040501 horticultureGrape dehydration kineticchemistry.chemical_compound0404 agricultural biotechnologyResponse surface methodologymedicineDehydrationResponse surface methodologyFood scienceGrape dehydration kinetics; Alkaline pretreatment; Berry skin mechanical properties; Response surface methodology; Muscat of Alexandria grapesBerry skin mechanical propertiesBerry skin mechanical propertieSafety Risk Reliability and QualityAlkaline pretreatmentChemistryProcess Chemistry and Technology04 agricultural and veterinary sciencesSettore AGR/15 - Scienze E Tecnologie Alimentarimedicine.disease040401 food scienceMuscat of Alexandria grapesSodium hydroxideGrape dehydration kineticsPostharvestHydroxide0405 other agricultural sciencesLow sodiumFood Science
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Characterization of lignin dissolved during alkaline pretreatment of softwood and hardwood

2015

Various alkaline pretreatments were applied to Scots pine (Pinus sylvestris) and silver/white birch (Betula pendula/pubescens) wood chips and the characterization of sulfur-free lignin dissolved was performed. The behavior of lignin during these pretreatments (alkali charge 1–8% NaOH, time 30–120 minutes, and temperature 130–150°C) was studied mainly in terms of lignin removal efficiency and molar mass distribution of dissolved lignin. The amount of lignin in pretreatment liquors increased along with an increase in the alkali charge of 0.8–4.4% and 0.6–3.4% of o.d. pine and birch wood, respectively. The most significant parameter affecting the molar mass of the dissolved lignin was shown to…

Molar massSoftwoodbiologyBetula pendula/pubescensGeneral Chemical EngineeringScots pineligninPinus sylvestrisGeneral Chemistrymolar mass distributionbiology.organism_classificationAlkali metalchemistry.chemical_compoundchemistryBetula pendulaBotanyHardwoodMolar mass distributionLigninGeneral Materials Scienceta116Alkaline pretreatmentNuclear chemistryJournal of Wood Chemistry and Technology
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