Preparation and Characterization of a Pectin Membrane-Based Optical pH Sensor for Fish Freshness Monitoring

Hasanah, Uswatun; Setyowati, Mita; Efendi, Rustam; Muslem, Muslem; Sani, Nor Diyana Md; Safitri, Eka; Heng, Lee Yook; Idroes, Rinaldi

doi:10.3390/bios9020060

Cited by 43 publications

(43 citation statements)

References 23 publications

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“…The surface area of a solid catalyst has a direct impact on its catalytic activity [37,38]. Hydration and dehydration (recalcination) treatments play a vital role for improving the surface area of a catalyst [39].…”

Section: Braunaeur-emmet-teller (Bet)mentioning

confidence: 99%

Impregnation of CaO from Eggshell Waste with Magnetite as a Solid Catalyst (Fe3O4/CaO) for Transesterification of Palm Oil Off-Grade

et al. 2020

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In this work, calcium oxide (CaO) extracted from eggshell impregnated with magnetite (Fe 3 O 4 ) is prepared successfully and it had been applied on transesterification of palm oil off-grade. Prior experiment, the eggshells material are powdered and calcined at 900 • C then impregnated with Fe 3 O 4 and recalcined. The obtained Fe 3 O 4 /CaO catalyst is characterized using X-ray diffraction and Braunaeur-Emmet-Teller (BET) surface area. The influence of various parameters including recalcined time and temperature are investigated. The prepared catalyst is tested for transesterification of palm oil off-grade to produce biodiesel in which the optimal conditions of a methanol/palm oil off-grade molar ratio of 10:1, the catalyst weight of 6%, the reaction temperature of 70 • C, and the reaction time of 2 h. The transesterification product was analyzed using GC-MS, which showed the biodiesel yield of 90% at the recalcined temperature of 600 • C and reaction time of 2 h. It has been noted that the catalyst activity is achieved when the moderate recalcination temperature is applied and the disordered structure of the catalyst is maintained. This study also confirms that CaO impregnated with Fe 3 O 4 could be a solid catalyst for the biodiesel synthesis through transesterification reaction of palm oil off-grade.Catalysts 2020, 10, 164 2 of 13 this issue, several countries have successfully implemented some renewables from bioenergy, including biogas, biodiesel, and bioethanol [2][3][4][5]. On the other sides, some countries have also successfully generated the electrical power from renewable energy resources, such as geothermal, waves, hydro, wind, and solar energy [6][7][8][9][10]. However, there are some weak points resulted while the renewable energy is used, such as it is unstable, only available for certain periods, and therefore, its required the energy storage devices such as battery. However, the energy storage capacity of batteries is very limited, and for this reason some scientists are attempting to discover another type of energy storage materials that can store significant amount of energy [11][12][13].Calcium is one of the most abundant metals on earth. It can be mostly found as an ion in seawater [14], as well as geothermal hot springs [15][16][17][18]. It can be also found as an oxide in limestone and fossilized remnant sites [14]. However, in order to obtain the calcium from these resources is required the natural resource exploitation that is often given negative impact to environment. Considering the environmental safety, an alternative way has been used to produce calcium source, namely it produce from some renewable resources which are available abundantly in nature, such as egg shell material wastes, because the egg shell well known as a natural material contained lots of calcium oxide [19]. As fact, the eggshell waste has been an abundant wastes in environment either come from egg consumption or the food industries. The waste materials are interesting to use as eco-friendly material to produce CaO ...

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Section: Braunaeur-emmet-teller (Bet)mentioning

confidence: 99%

Impregnation of CaO from Eggshell Waste with Magnetite as a Solid Catalyst (Fe3O4/CaO) for Transesterification of Palm Oil Off-Grade

et al. 2020

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“…The response of the pH optical sensor at pH 5-9 has a sensitivity of 0.056 (R 2 = 0.0986), where the color change of CI takes place against the change of pH, as reported by Hasanah et al [33]. This becomes the basis for TG determination of this optical biosensor, as a pH change will occur when lipase hydrolyzes TPs into fatty acids.…”

Section: The Response Of a Triglyceride Optical Sensor Using A Pectinmentioning

confidence: 53%

“…Table 2 shows an increase of the biosensor response at pH 6-7, but a decrease at pH 7.5 and 8. The decrease in biosensor sensitivity is caused by the change in the conformation of the enzyme binding sites, thus decreasing their function in degrading triglycerides [33]. In this study, the best sensitivity was given by pH 7-hence, pH 7 is used for the upcoming characterization of the TG biosensor.…”

Section: The Effect Of Buffer Concentration Ph and Loading Enzyme Cmentioning

confidence: 88%

“…Our TG optical biosensor was prepared as illustrated by Hasanah et al [33], with modifications. The TG optical biosensor had two layers: the bottom layer was the pH optical sensor, consisting of CI contained in a pectin membrane (Pectin/CI); meanwhile, the upper layer consisted of lipase enzyme solution.…”

Section: Preparation Of Triglyceride Optical Biosensor and Biosensor mentioning

confidence: 99%

“…Biopolymers are superior in terms of biocompatibility, capability of enzyme absorption, thermal stability, and not to mention environmentally friendliness. Pectin, for instance, has been recognized for its hydrogel properties, which can facilitate the interaction of the active compounds and analytes within the matrix [32,33].…”

Section: Introductionmentioning

confidence: 99%

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Construction of a Hydrogel Pectin-Based Triglyceride Optical Biosensor with Immobilized Lipase Enzymes

Hasanah

Sani²,

Heng

et al. 2019

Biosensors

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A novel and simple optical biosensor to detect triglycerides (TGs) has been successfully constructed by using pectin hydrogel membrane as the indicator pH and chromoionophore ETH 5294 (CI), with lipase as the catalyst. The enzymatic working system against TGs releasing H+ ions will affect the color absorbance of CI. The characterization results show that a TG biosensor has the optimum condition and sensitivity at the phosphate buffer concentration of 50 mM, pH 7, and enzyme loading of 60 μg. The biosensor works at the tripalmitin (TP) concentration range of 100–400 mg/dL. With the sensitivity of 0.001 (∆A/(mg/dL)), the biosensor response reaches stability after five minutes, and the limit of detection (LOD) of the TG optical biosensor is 15 mg/dL. Relative standard deviation (RSD) in a reproducibility test was 2.5%, with a 15-day lifespan.

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Recent Progress in Intelligent Packaging for Seafood and Meat Quality Monitoring

Nami,

Taheri,

Siddiqui

et al. 2024

Adv Materials Technologies

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Food waste plays a crucial role in environmental and human health issues. To address these issues, intelligent packaging systems are proposed for the accurate assessment of the quality of food products. Intelligent packaging is a technology that integrates sensing systems with conventional packaging to provide smart sensing communication functions for real‐time food quality monitoring. The most important parts of this technology are generally classified as quantitative sensors (sensors) and qualitative sensors (indicators). Since seafood and meat products can spoil easily if not stored properly, applying intelligent packaging for real‐time monitoring of the safety of these products is beneficial. In this review, the spoiling process and essential performance characteristics are indicators of the quality of these food products are first discussed. Then, The characteristics and importance of various sensors and indicators that can be used for seafood and meat quality monitoring are presented. While discussing these topics, an updated review of recent scientific studies, preconditions, materials, advantages, and limitations are provided. Furthermore, the future need for improvements in intelligent packaging systems for real‐time quality and safety monitoring of food products is discussed. Finally, several important research examples of the challenges and perspectives of intelligent packaging applications for meat and seafood quality monitoring are presented.

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Preparation and Characterization of a Pectin Membrane-Based Optical pH Sensor for Fish Freshness Monitoring

Cited by 43 publications

References 23 publications

Impregnation of CaO from Eggshell Waste with Magnetite as a Solid Catalyst (Fe3O4/CaO) for Transesterification of Palm Oil Off-Grade

Impregnation of CaO from Eggshell Waste with Magnetite as a Solid Catalyst (Fe3O4/CaO) for Transesterification of Palm Oil Off-Grade

Construction of a Hydrogel Pectin-Based Triglyceride Optical Biosensor with Immobilized Lipase Enzymes

Recent Progress in Intelligent Packaging for Seafood and Meat Quality Monitoring

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