Preparation of a novel green optical pH sensor based on immobilization of red grape extract on bioorganic agarose membrane

Abolghasemi, Mir Mahdi; Sobhi, Monireh; Piryaei, Marzieh

doi:10.1016/j.snb.2015.10.038

Cited by 37 publications

(19 citation statements)

References 25 publications

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“…It is worth noticing that sensitivity and measurement range can be enhanced by adjusting the composition of agarose solution (i.e., the RI value), so the optical fibre would be capable to assess a variety of substances. Furthermore, functionalization of agarose is also possible, expanding the range of detectable chemical and biological agents 34,35 . Alternatively, one may investigate the transmitted spectrum of core-propagating modes since part of the lightwave travels as evanescent fields that interact with the filled holes, like in fluorescence measurements 25 .…”

Section: Discussionmentioning

confidence: 99%

Agarose-based structured optical fibre

Fujiwara

Cabral

Sato

et al. 2020

Sci Rep

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Biocompatible and resorbable optical fibres emerge as promising technologies for in vivo applications like imaging, light delivery for phototherapy and optogenetics, and localised drug-delivery, as well as for biochemical sensing, wherein the probe can be implanted and then completely absorbed by the organism. Biodegradable waveguides based on glasses, hydrogels, and silk have been reported, but most of these devices rely on complex fabrication procedures. In this sense, this paper proposes a novel structured optical fibre made of agarose, a transparent, edible material used in culture media and tissue engineering. The fibre is obtained by pouring food-grade agar into a mould with stacked rods, forming a solid core surrounded by air holes in which the refractive index and fibre geometry can be tailored by choosing the agarose solution composition and mould design, respectively. Besides exhibiting practical transmittance at 633 nm in relation to other hydrogel waveguides, the fibre is also validated for chemical sensing either by detecting volume changes due to agar swelling/dehydration or modulating the transmitted light by inserting fluids into the air holes. Therefore, the proposed agarosebased structured optical fibre is an easy-to-fabricate, versatile technology with possible applications for medical imaging and in vivo biochemical sensing.

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Section: Discussionmentioning

confidence: 99%

Agarose-based structured optical fibre

Fujiwara

Cabral

Sato

et al. 2020

Sci Rep

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“… 343 Abolghasemi et al covalently immobilized anthocyanines on agarose after activation with epichlorohydrin. 342 At 540 nm, the sensor film responded to pH changes in the range 1–10 within 3 min. Another food-related pH sensing material is based on curcumin and bacterial cellulose as immobilization matrix and is responsive from pH 6–10.…”

Section: Overview Of Commonly Used Absorptiometric Ph Probesmentioning

confidence: 99%

Optical Sensing and Imaging of pH Values: Spectroscopies, Materials, and Applications

2020

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This is the first comprehensive review on methods and materials for use in optical sensing of pH values and on applications of such sensors. The Review starts with an introduction that contains subsections on the definition of the pH value, a brief look back on optical methods for sensing of pH, on the effects of ionic strength on pH values and p K a values, on the selectivity, sensitivity, precision, dynamic ranges, and temperature dependence of such sensors. Commonly used optical sensing schemes are covered in a next main chapter, with subsections on methods based on absorptiometry, reflectometry, luminescence, refractive index, surface plasmon resonance, photonic crystals, turbidity, mechanical displacement, interferometry, and solvatochromism. This is followed by sections on absorptiometric and luminescent molecular probes for use pH in sensors. Further large sections cover polymeric hosts and supports, and methods for immobilization of indicator dyes. Further and more specific sections summarize the state of the art in materials with dual functionality (indicator and host), nanomaterials, sensors based on upconversion and 2-photon absorption, multiparameter sensors, imaging, and sensors for extreme pH values. A chapter on the many sensing formats has subsections on planar, fiber optic, evanescent wave, refractive index, surface plasmon resonance and holography based sensor designs, and on distributed sensing. Another section summarizes selected applications in areas, such as medicine, biology, oceanography, bioprocess monitoring, corrosion studies, on the use of pH sensors as transducers in biosensors and chemical sensors, and their integration into flow-injection analyzers, microfluidic devices, and lab-on-a-chip systems. An extra section is devoted to current challenges, with subsections on challenges of general nature and those of specific nature. A concluding section gives an outlook on potential future trends and perspectives.

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“…Anthocyanins belong to a group of naturally occurring phenolic compounds called flavonoids. They are watersoluble pigments and responsible for the coloration of flowers, fruits and vegetables that, depending on their pH, may appear red, purple, or blue (Abolghasemi et al 2016). Anthocyanin-rich plant food include the raspberry, blueberry, black rice and red cabbage.…”

Section: Introductionmentioning

confidence: 99%

Development of a novel colorimetric sensor based on alginate beads for monitoring rainbow trout spoilage

et al. 2018

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Alginate is a non-toxic, renewable, and linear copolymer obtained from the brown algae that can be easily shaped into beads. Its good gel forming properties have made it useful for entrapping food and pharmaceutical ingredients. In this study, alginate beads were used in a novel application as a colorimetric sensor in food intelligent packaging. Colorimetric sensor was developed through entrapping red cabbage extract as a pH indicator in alginate beads. The pH indicator beads were used in rainbow trout packaging for monitoring fillets spoilage. Color change of beads during fish storage was measured using the CIELab method. The alginate bead colorimetric sensor is validated by measuring total volatile basic nitrogen (TVB-N) levels and microbial populations in fish samples. Moreover, peroxide value (PV) and thiobarbituric acid reactive substances (TBARS) were evaluated during storage. Results indicated that increasing the bacterial population during storage and production of proteolytic enzymes resulted in protein degradation, accumulation of volatile amine compounds, increase in the pH and finally color change of alginate beads. The values of TVB-N, pH, PV and TBARS increased with time of storage. The results of TVB-N and microbial growth were in accordance with color change of beads and CIELab data. Therefore, the proposed system enjoys a high sensitivity to pH variations and is capable of monitoring the spoilage of fish or other protein-rich products through its wide range of color changes. The alginate beads containing the red cabbage extract can, thus, be used as a low-cost colorimetric sensor for intelligent packaging applications.

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Preparation of a novel green optical pH sensor based on immobilization of red grape extract on bioorganic agarose membrane

Cited by 37 publications

References 25 publications

Agarose-based structured optical fibre

Agarose-based structured optical fibre

Optical Sensing and Imaging of pH Values: Spectroscopies, Materials, and Applications

Development of a novel colorimetric sensor based on alginate beads for monitoring rainbow trout spoilage

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