Suchergebnisse

Study conducted in Aligarh City of Uttar Pradesh, India

Dabai (Canarium odontophyllum Miq.) is a highly nutritious fruit that has a huge potential to be marketed both locally and globally. However, the lack of promotion leads to an oversupply during peak season, thus reducing its market price. Proper handling and packaging are therefore necessary to maintain the quality and extend the shelf life of dabai. In the present work, nylon film with an oxygen transmission rate (OTR) of 55 cc/m2/day and water vapour transmission rate (WVTR) of 334 g/m2/day; polyethylene terephthalate (PET) film with an OTR of 90 cc/m2/day and WVTR of 35 g/m2/day; and low-density polyethylene (LDPE) film with an OTR of 8000 cc/m2/day and WVTR of 200 g/m2/day were used to pack dabai and stored at 5°C for 14 d. All films had a dimension of 200 × 300 mm, and a thickness of 0.01 μm. It was found that dabai maintained its hue angle (h°) values within the dark purple region (299.73° to 338.64°) and its lightness (L*) values throughout storage. However, the colour intensity (chroma) significantly changed (p < 0.05) between different films throughout storage (p < 0.05). The control sample had the most significant decrease in firmness and weight (p < 0.05) between day 0 and 14, followed by the samples stored in PET, LDPE, and nylon. Whereas the samples in LDPE demonstrated the lowest respiration rate as compared to nylon and PET. The uncompetitive Michaelis-Menten equation model was used to model the respiration rate of dabai. Results showed that all films obtained good fit (R2 of near to 1). Additionally, the mean relative percentage (E%) was less than 10%, thus indicating that the data were suitable for real-time application.

Rice husk is a typical solid waste generated during rice processing, typically disposed of by combustion or landfills. One promising method for repurposing rice husk ash is as a pozzolan in geopolymer foam. This study explores additives like hydrogen peroxide and sodium alcohol ether sulfate (SAES) to enhance the properties of porous geopolymer foam made from rice husk ash. Hydrogen peroxide is utilized as a foaming agent to enhance porosity, while SAES acts as a stabilizer to influence the structure of the foam. The foam was prepared by mixing sodium silicate, sodium hydroxide, rice husk ash, genioperl, hydrogen peroxide, and stabilizer in specific ratios. Two variables are hydrogen peroxide (0.0, 0.1, 0.2, 0.3, and 0.4 wt.%) and SAES (0.0, 0.5, 1.0, 1.5, and 2.0 wt.%). The compressive strength and total porosity tests are conducted according to standards. The results show that increased hydrogen peroxide increased total porosity but decreased compressive strength. On the other hand, SAES improved the foam's structural integrity and maintained the compressive strength without significantly increasing porosity at 1.0 wt.% concentrations. The optimal total porosity and compressive strength were achieved with 0.40 wt.% hydrogen peroxide and 1.0 wt.% SAES. This study contributes to agriculture science and technology by exploring the potential use of rice husk ash-based geopolymer foam and determining the optimum formulation for its production. The findings also suggest that this foam can be utilized in various agricultural applications such as buildings, pipelines, and agriculture fields.