scholarly journals The Effect of Electrospun Polycaprolactone Nonwovens Containing Chitosan and Propolis Extracts on Fresh Pork Packaged in Linear Low-Density Polyethylene Films

Foods ◽  
2021 ◽  
Vol 10 (5) ◽  
pp. 1110
Author(s):  
Emeli Vargas Romero ◽  
Loong-Tak Lim ◽  
Héctor Suárez Mahecha ◽  
Benjamin M. Bohrer
Keyword(s):  
Shelf Life ◽  
Meat Products ◽  
Storage Period ◽  
Active Packaging ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Refrigerated Storage ◽  
Linear Low Density Polyethylene ◽  
Oxidation Reactions ◽  
Propolis Extract

Fresh meat products are highly perishable and require optimal packaging conditions to maintain and potentially extend shelf-life. Recently, researchers have developed functional, active packaging systems that are capable of interacting with food products, package headspace, and/or the environment to enhance product shelf-life. Among these systems, antimicrobial/antioxidant active packaging has gained considerable interest for delaying/preventing microbial growth and deteriorative oxidation reactions. This study evaluated the effectiveness of active linear low-density polyethylene (LLDPE) films coated with a polycaprolactone/chitosan nonwoven (Film 1) or LLDPE films coated with a polycaprolactone/chitosan nonwoven fortified with Colombian propolis extract (Film 2). The active LLDPE films were evaluated for the preservation of fresh pork loin (longissimus dorsi) chops during refrigerated storage at 4 °C for up to 20 d. The meat samples were analyzed for pH, instrumental color, purge loss, thiobarbituric acid reactive substances (TBARS), and microbial stability (aerobic mesophilic and psychrophilic bacteria). The incorporation of the propolis-containing nonwoven layer provided antioxidant and antimicrobial properties to LLDPE film, as evidenced by improved color stability, no differences in lipid oxidation, and a delay of 4 d for the onset of bacteria growth of pork chops during the refrigerated storage period.

scholarly journals Effects of packaging and temperature on postharvest of atemoya

2002 ◽  
Vol 24 (3) ◽  
pp. 658-660 ◽  
Author(s):  
Fabio Yamashita ◽  
Lucia Helena da Silva Miglioranza ◽  
Lilian de Azevedo Miranda ◽  
Christian Marlon de Almeida e Souza
Keyword(s):  
Weight Loss ◽  
Shelf Life ◽  
Storage Time ◽  
Low Density Polyethylene ◽  
Eating Quality ◽  
Low Density ◽  
Refrigerated Storage ◽  
Annona Cherimola ◽  
Trained Panel

Effects of refrigerated storage and different packages on postharvest behaviour of fruits of atemoya (Annona cherimola x A. squamosa) cv. PR3 were investigated. Fruits were individually sealed in copolymer (PD-955) and low-density polyethylene (LDPE) bags and stored for 21 days at 15°C or 25°C. Then they were unwrapped and maintained at 25°C, for ripening. Weight loss and firmness of fruits were both affected by storage time, temperature and packaging. Weight loss in packaged atemoyas was lower than in the control, non-wrapped fruits. A non-trained panel scored the atemoyas for overall eating quality and appearance. Fruits sealed in LDPE did not ripen, probably due to an injurious atmosphere developed inside the package. Atemoyas packaged in PD-955 film had a shelf-life of 17 days against 13 days of the control ones, both stored at 15°C, an increase of 30% on shelf-life.

scholarly journals Effect of packaging on the shelf life of tender palmyra (Borassus flabellifer) fruit endosperm

2018 ◽  
Vol 10 (2) ◽  
pp. 705-709
Author(s):  
Dawn C.P. Ambrose
Keyword(s):  
Weight Loss ◽  
Shelf Life ◽  
Ambient Condition ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Refrigerated Storage ◽  
Molecular Density ◽  
Overall Acceptability ◽  
Polyethylene Bags ◽  
Poly Ethylene

Tender palmyra (Borassus flabellifer) fruit endosperm, also known as ice apple is consumed during the summer months especially in Southern and Eastern India. The endosperm is manually removed from the tender palmyra fruit using a heavy knife or sickle by the road side vendors before it is consumed. An investigation on retail film packaging was conducted to study the shelf life of tender palmyra endosperm in sealed packages. The research was carried out to study the effect of packaging films of different thickness on the physio-sensory properties of the endosperm under ambient (32±2°C) and refrigerated (5 ±1°C) conditions. The endosperm was packed in polypropylene bags of 40 and 80 micron thickness and low density polyethylene bags of 150 and 450 micron thickness and High Molecular density (HM) polyethylene bags of 40 micron thickness. The packed samples were kept for storage under ambient and refrigerated conditions. They were evaluated for the changes in weight loss, TSS and also firmness, colour and odour by subjective evaluation at periodic interval during storage.  The weight loss was minimum for the sample packed in 450 micron Low Density Polyethylene bag under refrigerated storage. Sensory scores revealed that the overall acceptability(5.0) of palmyra endosperm packed in 450 micron thickness Low Density Poly Ethylene was highest at the end of storage under ambient condition. Similarly, highest overall acceptability (4.0) was observed in High Molecular density polyethylene bag of 40 micron thickness at refrigerated storage. Under normal conditions, palmyra endosperm is prone to spoilage within few hours due to oxidation and fermentation. The results of the study revealed that the shelf life of palmyra endosperm could be extended up to two days under ambient condition, when packed in Low Density Poly Ethylene bag of 450 micron thickness, whereas under refrigerated condition, shelf life could be up to eight days, when packed in high molecular density polyethylene bags of 40 micron thickness.

scholarly journals Identification of the LLDPE Constitutive Material Model for Energy Absorption in Impact Applications

Polymers ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 1537
Author(s):  
Luděk Hynčík ◽  
Petra Kochová ◽  
Jan Špička ◽  
Tomasz Bońkowski ◽  
Robert Cimrman ◽  
...  
Keyword(s):  
Strain Rate ◽  
Material Model ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Linear Low Density Polyethylene ◽  
Stress Strain ◽  
Rate Dependent ◽  
Constitutive Material Model ◽  
Principal Directions ◽  
Constitutive Material

Current industrial trends bring new challenges in energy absorbing systems. Polymer materials as the traditional packaging materials seem to be promising due to their low weight, structure, and production price. Based on the review, the linear low-density polyethylene (LLDPE) material was identified as the most promising material for absorbing impact energy. The current paper addresses the identification of the material parameters and the development of a constitutive material model to be used in future designs by virtual prototyping. The paper deals with the experimental measurement of the stress-strain relations of linear low-density polyethylene under static and dynamic loading. The quasi-static measurement was realized in two perpendicular principal directions and was supplemented by a test measurement in the 45° direction, i.e., exactly between the principal directions. The quasi-static stress-strain curves were analyzed as an initial step for dynamic strain rate-dependent material behavior. The dynamic response was tested in a drop tower using a spherical impactor hitting a flat material multi-layered specimen at two different energy levels. The strain rate-dependent material model was identified by optimizing the static material response obtained in the dynamic experiments. The material model was validated by the virtual reconstruction of the experiments and by comparing the numerical results to the experimental ones.

Physical and mechanical properties of linear low-density polyethylene/cycloolefin copolymer/layered silicate nanocomposite

2015 ◽  
Vol 37 (11) ◽  
pp. 3167-3174 ◽  
Author(s):  
S. Sánchez-Valdes ◽  
E. Ramírez-Vargas ◽  
L.F. Ramos de Valle ◽  
J.G. Martinez-Colunga ◽  
J. Romero-Garcia ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Layered Silicate ◽  
Physical And Mechanical Properties ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Linear Low Density Polyethylene

Shear characterization of CaCO3-filled linear low density polyethylene

1988 ◽  
Vol 27 (2) ◽  
pp. 172-178 ◽  
Author(s):  
S. Ottani ◽  
A. Valenza ◽  
F. P. La Mantia
Keyword(s):  
Low Density Polyethylene ◽  
Low Density ◽  
Linear Low Density Polyethylene
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