1,720,982 research outputs found
Encapsulation of hexanal in Ca squarte MOF for active packaging
No full textVarious high surface area porous materials have been widely researched for active food applications. Metal organic frameworks (MOFs), a vast family of porous compounds, have been derived by combining metal ions with organic linkers to form complex 3D structures. Pores present in these structures can be engineered to encapsulate active molecular species and control their release kinetics in the headspace of a product package system for shelflife extension. This work focuses on synthesizing calcium squarate acid MOF, also known as UTSA-280 using mechano-chemical synthesis process. Hexanal, a volatile antimicrobial compound, was encapsulated in UTSA-280 crystals via vapor diffusion process. The synthesized crystals were characterized before and after hexanal encapsulation using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and scanning electron microscopy (SEM). XRD patterns, FTIR and SEM images indicate that the UTSA-280 crystals were successfully synthesized. FTIR, TGA and DSC analyses conclude that encapsulation was successful, with TGA showing that approximately ~20 wt% hexanal was encapsulated in the UTSA-280 structure
Encapsulation of hexanal in Ca squarte MOF for active packaging
No full textVarious high surface area porous materials have been widely researched for active food applications. Metal organic frameworks (MOFs), a vast family of porous compounds, have been derived by combining metal ions with organic linkers to form complex 3D structures. Pores present in these structures can be engineered to encapsulate active molecular species and control their release kinetics in the headspace of a product package system for shelflife extension. This work focuses on synthesizing calcium squarate acid MOF, also known as UTSA-280 using mechano-chemical synthesis process. Hexanal, a volatile antimicrobial compound, was encapsulated in UTSA-280 crystals via vapor diffusion process. The synthesized crystals were characterized before and after hexanal encapsulation using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and scanning electron microscopy (SEM). XRD patterns, FTIR and SEM images indicate that the UTSA-280 crystals were successfully synthesized. FTIR, TGA and DSC analyses conclude that encapsulation was successful, with TGA showing that approximately ~20 wt% hexanal was encapsulated in the UTSA-280 structure
Mechanochemical synthesis of Calcium-Squarate MOF and encapsulation of hexanal
No full textPorous high surface area supramolecules have been widely researched for controlled delivery and chemical stabilization of active molecular species. Metal-organic frameworks (MOFs), a vast category of high surface area microporous compounds, can be tailored to encapsulate specific active molecules, and control their release kinetics in the headspace of a product-package system for treatment and shelf-life extension of various agricultural produce. Hexanal has been widely reported to reduce post-harvest losses due to its antimicrobial, antifungal, ethylene-modulating, and phospholipase D (PLD) inhibiting characteristics. In this work, we synthesized Calcium-Squarate MOF by a quick simple mechanochemical process using bioderived linkers and non-toxic endogenous cations. We herein report the encapsulation of hexanal in Ca-Squarate MOF, and probe the strength of non-covalent host-guest interactions of hexanal encapsulated in the pores. The synthesized MOF crystals were characterized by thermal analysis, infrared spectroscopy, and diffraction studies. We observed approximately 20% encapsulation of hexanal by weight using thermo-gravimetric analysis. The infrared spectroscopy and simulation study supported the formation of hydrogen bonds between H atoms of hexanal and O atoms of the Ca-Squarate MOF with the strongest binding affinity of -3.81 kcal mol-1. Crystals maintained their porous structure and microscale morphologies post-encapsulation, as observed using X-ray diffraction and scanning electron microscopy. These results are encouraging for the potential use of hexanal encapsulated MOFs in active packaging applications.The authors would like to thank Hasselt University for sponsoring Tuur Bollen’s internship within the framework of generic scholarships 2023-2024 to conduct this research work at California Polytechnic State Universit
Encapsulation of ethanol in cyclodextrin and bio-based cyclodextrin metal-organic framework for active packaging
No full textIn the last two decades, various porous materials have been researched by the scientific community for diverse applications. Metal-organic frameworks (MOFs) belong to the class of microporous, high surface area crystalline materials synthesized by coordinating metal ions with organic linkers. MOFs can host various molecules in their pores, depending on their interaction. This host-guest chemistry can be utilized to sorb established active organic compounds such as ethanol, acetaldehyde, formaldehyde, cinnamaldehyde, thymol, etc. Extended release of such active species can be used to optimize the shelf life of food products. In addition, porous compounds have the potential to be used for sensing applications in Intelligent Packaging. In this study, encapsulation of ethanol was studied in gamma-cyclodextrin (gamma-CD) and gamma-cyclodextrin metal-organic framework (gamma-CDMOF). Benign gamma-CDMOF was synthesized using edible, bio-based compounds. Ethanol, an antifungal, antimicrobial and antiseptic compound, was encapsulated in the gamma-CD and gamma-CDMOF crystals using a vapor diffusion process. The materials were characterized using various thermal, spectroscopy and microscopy tools. It was observed that gamma-CD and gamma-CDMOF can encapsulate ~8 and 20% w/w of ethanol respectively.CalPoly Universit
Encapsulation of ethanol in cyclodextrin and bio-based cyclodextrin metal-organic framework for active packaging
No full textIn the last two decades, various porous materials have been researched by the scientific community for diverse applications. Metal-organic frameworks (MOFs) belong to the class of microporous, high surface area crystalline materials synthesized by coordinating metal ions with organic linkers. MOFs can host various molecules in their pores, depending on their interaction. This host-guest chemistry can be utilized to sorb established active organic compounds such as ethanol, acetaldehyde, formaldehyde, cinnamaldehyde, thymol, etc. Extended release of such active species can be used to optimize the shelf life of food products. In addition, porous compounds have the potential to be used for sensing applications in Intelligent Packaging. In this study, encapsulation of ethanol was studied in gamma-cyclodextrin (gamma-CD) and gamma-cyclodextrin metal-organic framework (gamma-CDMOF). Benign gamma-CDMOF was synthesized using edible, bio-based compounds. Ethanol, an antifungal, antimicrobial and antiseptic compound, was encapsulated in the gamma-CD and gamma-CDMOF crystals using a vapor diffusion process. The materials were characterized using various thermal, spectroscopy and microscopy tools. It was observed that gamma-CD and gamma-CDMOF can encapsulate ~8 and 20% w/w of ethanol respectively.CalPoly Universit
Fabrication and Characterization of Poly (L-lactic acid) ' Aluminum based Metal Organic Frameworks Mixed Matrix Membranes
No full textPoly (L-lactic acid) (PLLA) and Aluminum based Metal Organic Frameworks (MOFs) mixed matrix membranes (MMMs) were prepared by solvent casting PLLA with 1, 5, 10 and 20% w/w of MIL-53(Al). PLLA and PLLA-MOF MMMs were characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), differential scanning calorimetry (DSC) and thermal gravimetric analysis (TGA). DSC studies indicate that the addition of MOF particles in the PLA polymer matrix reduces the polymeric chain mobility, which affects the crystallization process. The percent crystallinity of neat PLLA was found to be 3.23% and decreased by around 4% for PLLA-1% MOF and 85% for PLLA-5% MOF as compared to neat PLLA. PLLA-10% MOF and PLLA-20% MOF compositions were completely amorphous. TGA results show that PLLA-MOF MMMs are thermally less stable than neat PLLA suggesting that MOF particles act as a depolymerization catalyst for PLLA. An average of 14% volatile compounds originated from trapped chloroform was found in neat PLLA and PLLA-MOF compounds. The variable wt% of MOF in the samples for the different PLLA-MOF ratios indicated that the MOF particles were not well dispersed in the PLLA matrix. This was confirmed by SEM analysis showing that MOF particles have the tendency to accumulate within the PLLA matrix. In this study non-homogeneous MMMs containing chloroform were fabricated. Future work can be focused on improving the synthesis technique and the impact of MOF particles on permeability of PLLA'MOF MMMs for different compounds
Synthesis and Characterization of Gamma Cyclodextrin Metal Organic Framework and Encapsulation of Ethanol
No full textVarious porous materials, including metal organic frameworks (MOFs), have been extensively researched in recent years for different applications. MOFs are synthesized by the coordination of metal ions with organic binders. Different molecules can be incorporated into the pores of MOFs. This host-guest chemistry can be used to absorb established active organic compounds. The prolonged release of such active species can be used to optimize the shelf life of food products.
In this study biobased γ-cyclodextrin metal organic framework (γ-CDMOF) was synthesized using methanol diffusion in a solution of γ-CD and potassium hydroxide (KOH). γ-Cyclodextrin (γ-CD) is a symmetric oligosaccharide produced from starch that is already used as a solvent and stabilizer in various food products. Ethanol was encapsulated in the γ-CDMOF crystals using vapor diffusion.
The synthesized γ-CDMOF crystals were characterized before and after encapsulation using X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transformation infrared spectroscopy (FTIR), differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA).
The XRD pattern shows the crystallinity of the γ-CDMOF, from which a successful synthesis can be concluded. This conclusion is also confirmed by the images obtained with SEM. The TGA results show that γ-CDMOF can encapsulate ~20% ethanol. The results of DSC and FTIR show that ethanol is indeed encapsulated. Moreover, it appears that ethanol has little influence on γ-CDMOF
Synthesis and Characterization of Gamma Cyclodextrin Metal Organic Framework and Encapsulation of Ethanol
No full textVarious porous materials, including metal organic frameworks (MOFs), have been extensively researched in recent years for different applications. MOFs are synthesized by the coordination of metal ions with organic binders. Different molecules can be incorporated into the pores of MOFs. This host-guest chemistry can be used to absorb established active organic compounds. The prolonged release of such active species can be used to optimize the shelf life of food products.
In this study biobased γ-cyclodextrin metal organic framework (γ-CDMOF) was synthesized using methanol diffusion in a solution of γ-CD and potassium hydroxide (KOH). γ-Cyclodextrin (γ-CD) is a symmetric oligosaccharide produced from starch that is already used as a solvent and stabilizer in various food products. Ethanol was encapsulated in the γ-CDMOF crystals using vapor diffusion.
The synthesized γ-CDMOF crystals were characterized before and after encapsulation using X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transformation infrared spectroscopy (FTIR), differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA).
The XRD pattern shows the crystallinity of the γ-CDMOF, from which a successful synthesis can be concluded. This conclusion is also confirmed by the images obtained with SEM. The TGA results show that γ-CDMOF can encapsulate ~20% ethanol. The results of DSC and FTIR show that ethanol is indeed encapsulated. Moreover, it appears that ethanol has little influence on γ-CDMOF
Fabrication and Characterization of Poly (L-lactic acid) ' Aluminum based Metal Organic Frameworks Mixed Matrix Membranes
No full textPoly (L-lactic acid) (PLLA) and Aluminum based Metal Organic Frameworks (MOFs) mixed matrix membranes (MMMs) were prepared by solvent casting PLLA with 1, 5, 10 and 20% w/w of MIL-53(Al). PLLA and PLLA-MOF MMMs were characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), differential scanning calorimetry (DSC) and thermal gravimetric analysis (TGA). DSC studies indicate that the addition of MOF particles in the PLA polymer matrix reduces the polymeric chain mobility, which affects the crystallization process. The percent crystallinity of neat PLLA was found to be 3.23% and decreased by around 4% for PLLA-1% MOF and 85% for PLLA-5% MOF as compared to neat PLLA. PLLA-10% MOF and PLLA-20% MOF compositions were completely amorphous. TGA results show that PLLA-MOF MMMs are thermally less stable than neat PLLA suggesting that MOF particles act as a depolymerization catalyst for PLLA. An average of 14% volatile compounds originated from trapped chloroform was found in neat PLLA and PLLA-MOF compounds. The variable wt% of MOF in the samples for the different PLLA-MOF ratios indicated that the MOF particles were not well dispersed in the PLLA matrix. This was confirmed by SEM analysis showing that MOF particles have the tendency to accumulate within the PLLA matrix. In this study non-homogeneous MMMs containing chloroform were fabricated. Future work can be focused on improving the synthesis technique and the impact of MOF particles on permeability of PLLA'MOF MMMs for different compounds
Shelf Life Evaluation/Prediction of a High Fat/Sugar and a Low Fat/Sugar Ready to Eat Breakfast Cereal in Standard Packaging and Various Size Airtight Plastic Containers using the Guggenheim-Anderson-de Boer (GAB) Model
No full textPlan APackaging is an important component for storage and extension of shelf life of a food product.
The objective of this study was to evaluate/predict the shelf life of a high fat/sugar (A) and a low
fat/sugar (B) RTE breakfast cereal in standard packaging and various size polypropylene airtight
plastic containers. Moisture sorption isotherms of the two cereals were determined at 10, 23, and
38°C over a humidity range of 11-98.2% using accelerated shelf life testing. Both cereals
exhibited a Type II moisture sorption isotherm. GAB model provided good fits for both cereals
(with R2>0.9524, %RMS<10.2039, E<8.0890, and RMSE<0.0318). Moisture content and water
activity of the cereals decreased as temperature increased. Water activity, breaking strength, and
sensory results determined that the critical moisture content was 5.5% and 6.5% for cereal A and
B, respectively. Water vapor transmission rate (WVTR) increased as size of the container
increased (0.0375 and 0.0407 g/pkg.-day for 4 quart and standard packaging, respectively at
23°C). Using the critical moisture content and WVTR the polypropylene containers extended
the shelf life of both breakfast cereals (A and B), 156 and 59 days and 236 and 89 days in 4 quart
and standard packaging, respectively, at 23°C (80% RH
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