Mesquite seed gum and palm fruit oil emulsion edible films: Influence of oil content and sonication

• Published in: Food hydrocolloids Vol. 56; pp. 227 - 235
• Main Authors: Rodrigues, Delane C., Cunha, Arcelina P., Brito, Edy S., Azeredo, Henriette M.C., Gallão, Maria Izabel
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.05.2016
• Subjects: Contact; Contact angle; Droplets; Edible films; Emulsions; Galactomannans; Lipids; Mesquite; Nanostructure; Palm; Polysaccharides; Seeds; Ultrasound; Lipids; Polysaccharides; Ultrasound; Edible films; Galactomannans
• ISSN: 0268-005X; 1873-7137
• DOI: 10.1016/j.foodhyd.2015.12.018

Mesquite seed gum (MSG) was extracted and confirmed as a galactomannan, presenting a galactose/mannose (G/M) ratio of about 1:1.1. Emulsions of MSG and palm fruit oil (PFO) were prepared by mixing a PFO nanoemulsion with MSG and glycerol, in order to obtain MSG/PFO emulsion films by casting and evaporation. The influence of sonication time of O/W nanoemulsion and PFO content (based on MSG) on the film properties were evaluated. All O/W emulsions presented nanosized droplets, lower PFO contents producing smaller droplets. Increasing PFO contents resulted in increased hydrophobicity (reflected as increased water contact angles, decreased water solubility and water vapor permeability), and impaired transparency and tensile properties (except for elongation). The only significant effects of sonication were the increase of film hydrophilicity (decreasing contact angles) and improvement of tensile strength, probably by promoting a more uniform droplet dispersion. [Display omitted] •Mesquite seed gum (MSG) was extracted and confirmed as a galactomannan.•Film were prepared from nanoemulsions of palm fruit oil (PFO) in water and MSG.•Effects of nanoemulsion sonication and PFO content on film properties were assessed.•PFO increased hydrophobicity and impaired film transparency and tensile properties.•Nanoemulsion sonication time decreased contact angles and improved tensile strength.