To obtain high-quality insect products, milling was used as a modification tool and its effect on grasshopper chitin, chitosan and chitosan films was investigated. Three grasshopper powders were obtained and classified into coarse-milled powder (CMP, D90 = 956 μm), medium-milled powder (MMP, D90 = 492 μm), and ultrafine-milled powder (UMP, D90 = 79.1 μm). Fourier transform infrared spectroscopy illustrated that no drastic change due to milling was observed, but the crystallinity (X-ray diffraction) and thermal stability (Thermogravimetric analysis) of the chitin, chitosan and chitosan films reduced with increasing milling intensity. Besides, the purity of the chitin and the yield of chitosan obtained from UMP were improved. Chitosan prepared from UMP was also characterized by high degree of deacetylation (65.6 %) and solubility and rather low molecular weight (11.5 kDa), viscosity and water/fat binding capacity. The finer the powder used as the extraction material, the thinner the chitosan films and the more compact the structure. On the whole, the chitosan films prepared from the MMP had higher mechanical properties and better moisture-keeping ability on strawberries compared with CMP and UMP films. This study establishes the role milling intensity played in the modification of grasshopper products and provides a reference for practical applications.
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http://dx.doi.org/10.1016/j.ijbiomac.2023.124249 | DOI Listing |
Int J Biol Macromol
January 2025
Department of Food Science, Federal University of Lavras (UFLA), Lavras 37200-000, Brazil.
The use of active packaging made from biodegradable polymers can contribute to the environment and to the food industry by increasing the shelf life of their products. This study aimed to produce chitosan-based films incorporated with the invertase enzyme (1, 2, 5, 9, and 10 %) as an alternative to avoid sucrose crystallization in the confectionery industry. The optimum activity of the invertase enzyme was observed at 55 °C and pH 5, thus, the films made with the film-forming solution adjusted to pH 5 and dried at 55 °C were compared with those without pH adjustment and dried at room temperature.
View Article and Find Full Text PDFJ Control Release
January 2025
Department of Pharmaceutical Sciences, School of Pharmacy, University of Pittsburgh, Pittsburgh, PA, USA; Magee-Womens Research Institute, Pittsburgh, PA, USA; Department of Obstetrics, Gynecology & Reproductive Sciences, School of Medicine, University of Pittsburgh, Pittsburgh, PA, USA. Electronic address:
User adherence contributes to the effectiveness of topical pre-exposure prophylactic products designed to protect against human immunodeficiency virus type 1 (HIV-1) infection. Long-acting approaches that do not require daily or coitally-dependent use could potentially improve user adherence. This study aims to develop a long-acting vaginal film to deliver an integrase inhibitor, MK-2048, for prevention of HIV-1 infection.
View Article and Find Full Text PDFInt J Biol Macromol
January 2025
College of Food Science and Engineering, Gansu Agricultural University, Lanzhou, China.. Electronic address:
The present study intended to investigate the properties of collagen peptide (CP)-astragaloside (AG) nanocomplexes (CPANs) improved oxidized hydroxypropyl starch (OHS)/chitosan (CS) (OC) film and to explore the preservation of chilled beef. The results indicated that AG significantly enhanced the stability, antioxidant capacity, and antibacterial properties of CP through mechanisms like static quenching and hydrophobic interactions. The incorporation of CPANs improved thickness, swellability, and water vapor blocking, UV-blocking and mechanical properties, antioxidant and antibacterial activity of OC film.
View Article and Find Full Text PDFCompr Rev Food Sci Food Saf
January 2025
College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science and Technology, Xi'an, China.
Although traditional petroleum-based packaging materials pose environmental problems, biodegradable packaging materials have attracted extensive attention from research and industry for their environmentally friendly properties. Bio-based films, as an alternative to petroleum-based packaging films, demonstrate their significant advantages in terms of environmental friendliness and resource sustainability. This paper provides an insight into the development of biomass food packaging films such as cellulose, starch, chitosan, and gelatine, including their properties, methods of preparation (e.
View Article and Find Full Text PDFInt J Biol Macromol
January 2025
The National Center for Precision Machining and Safety of Livestock and Poultry Products Joint Engineering Research Center, College of Food Science, South China Agricultural University, 510642, China; Guangdong Provincial Key Laboratory of Food Quality and Safety, College of Food Science, South China Agricultural University, Guangzhou 510642, China. Electronic address:
Cantonese sausages are susceptible to oxidative deterioration during storage. Compared with synthetic antioxidants, dihydromyricetin (DMY) is a natural active substance with various functions such as antioxidant and antimicrobial. In this study, edible coating solutions loaded with DMY were prepared based on chitosan (CS) and pullulan (PUL) to prolong the shelf-life of Cantonese sausages.
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