A novel pH-sensing indicator based on bacterial cellulose nanofibers and black carrot anthocyanins for monitoring fish freshness

Moradi, Mehran
Tajik, Hossein
Almasi, Hadi
Forough, Mehrdad
Ezati, Parya
A novel intelligent pH-sensing indicator based on bacterial nanocellulose (BC) and black carrot anthocyanins (CA) was developed and characterized to monitor the freshness/spoilage of rainbow trout and common carp fillet during the storage at 4 degrees C. The indicator displayed wide color differences from red to gray over the 2-11 pH range, which was clearly discerned by the naked eye. The fabricated pH-sensing indicator showed distinguishable color changes during fresh (deep carmine color), best to eat (charm pink color), and spoiled (jelly bean blue and khaki colors) stages of both fish fillets. Moreover, a strong and positive correlation was obtained between the total color differences values of the indicator and bacterial count (R= 0.952 and 0.991) and total volatile basic nitrogen (R= 0.815 and 0.92) in rainbow trout and common carp samples. The results of this work demonstrated a significant correspondence of fish shelf life and color changes of a nanocellulose-based pHsensing indicator.


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A quantum chemical study, based on DFT theory is presented which considers certain selenium-containing naphthalene derivatives, including a keto group together with a Se atom embedded in either a five- or six-membered ring fused with naphthalene moiety. The corresponding enol structures also are considered. The quantum chemical and IR data collected are analyzed and NICS(0) values have been obtained.
A novel multi-electrochromic polymer based on selenophene and benzotriazole via electrochemical and chemical polymerization
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In this study, a novel donor-acceptor type monomer was designed based on selenophene and benzotriazole with a bulky pendant group and synthesized through Stille coupling reaction. The monomer was polymerized electrochemically by using cyclic voltammetry and also chemically by oxidation in the presence of FeCl3. Both polymers were then compared in terms of their optical properties, electrochemical and spectroelectrochemical behaviors, kinetic and colorimetric properties and surface morphologies. Independent ...
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Atılgan, Serdar; Akkaya, Mahinur S.; Department of Chemistry (2009)
Near-IR dyes that absorb and emit in the red visible or near-IR region have attracted great interest in the fields of medicinal chemistry and biochemistry for the last few decades. This interest is due to the multiple notes of metal ions in biological and enviromental processes. Therefore the development of cation selective and sensitive sensors have been a hot subject for many researchers. Consequently, fluorescence based sensors are the most efficient and favorable ones among its counterparts in the field...
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In this study, we have investigated the effect of substrate temperature, use of adhesive layer, deposition rate, annealing and substrate prebaking on the morphology of gold films deposited onto quartz surfaces. For the film growth, physical vapor deposition methods namely electron beam and thermal depositions have been used. Surface morphology of the films have been characterized with atomic force microscopy. Our aim was to confirm the general trends observed for these parameters in our evaporator system fo...
Citation Formats
M. Moradi, H. Tajik, H. Almasi, M. Forough, and P. Ezati, “A novel pH-sensing indicator based on bacterial cellulose nanofibers and black carrot anthocyanins for monitoring fish freshness,” CARBOHYDRATE POLYMERS, pp. 0–0, 2019, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/68084.