A novel on-package color indicator has been fabricated based on bromophenol blue, and tests have been conducted to assess the freshness of guava (Psidium guajava L.). Bromophenol blue (BPB) was immobilized onto bacterial cellulose membrane via absorption method. The BPB/cellulose Read More …
Month: October 2017
A novel colorimetric food package label for fish spoilage based on polyaniline film
A novel colorimetric method based on polyaniline (PANI) film for the development of smart packaging, as a chemical sensor for real-time monitoring of the microbial breakdown products in the headspace of packaged fish is described. This on-package indicator contains PANI Read More …
Optical fiber chemical sensing of Hg(II) ions in aqueous samples using a microfluidic device containing a selective tripodal chromoionophore-PVC film
A novel methodology for the determination of Hg(II) ions was developed based on optical fiber chemical sensing in a microfluidic device containing a selective tripodal chromoionophore (i.e. tris[2-(4-phenyldiazenyl)phenylamino)ethoxy]cyclotriveratrylene/TPPECTV)-PVC film. Absorbance detection was performed by incorporating a single optical fiber on Read More …
Real-Time Monitoring of Shrimp Spoilage Using On-Package Sticker Sensor Based on Natural Dye of Curcumin
The development of a curcumin-based sensor for the detection of volatile amines (specifically known as total volatile basic nitrogen, TVBN) is described. Curcumin [(1E,6E)-1,7-bis(4-hydroxy-3-methoxyphenyl)hepta-1,6-diene-3,5dione] is the major yellow pigment extracted from turmeric, a commonly used spice, derived from the rhizome Read More …
Selective Chemosensor Based on 7-Nitrobenzofurazan in Tripodal Structure for the Detection of Hg(II) Ions in Environmental and Cosmetic Samples
A selective tripodal chemosensor based on 1,1,1-tris[(7-nitrobenzofurazan-4-yl)-n-1-aza-5-oxahexanyl] propane (1, TNFHP) has been developed for the detection of Hg(II) ions. This receptor exhibits a pronounced chromogenic behavior toward Hg(II) ions by changing the color of the solution from yellow to dark Read More …
Smart packaging: sensors for monitoring of food quality and safety
The development of chemical sensors and biosensors over several decades has been investigated resulting in novel and very interesting sensor devices with great promise for many areas of applications including food technology. The incorporation of such sensors into the food Read More …
An Optical Fiber Biosensor for Heavy Metal Ions Based on a Modified Single Sol-Gel Film of Urease and Chlorophenol Red in Flow System
An optical fiber biosensor based on a modified single sol gel film consisting of urease and chlorophenol red (CPR) was employed to detect heavy metal ions in aqueous samples. The modification relies on addition of poly(vinyl alcohol) (PVA) into sol-gel Read More …
Selective chemosensor for Hg(II) ions based on tris[2-(4-phenyldiazenyl)phenylaminoethoxy]cyclotriveratrylene in aqueous samples
A novel chemosensor, based on tris[2-(4-phenyldiazenyl)phenylaminoethoxy]cyclotriveratrylene (TPPECTV) as chromophore, has been developed for the colorimetric determination and visual detection of Hg(II) ions. TPPECTV exhibits a pronounced chromogenic behavior toward Hg(II) ions by changing the color of the solution from yellow Read More …
An optical fiber biosensor for chlorpyrifos using a single sol-gel film containing acetylcholinesterase and bromothymol blue
An optical fiber biosensor consisting of acetylcholinesterase (AChE) and bromothymol blue (BTB) doped sol–gel film was employed to detect organophosphate pesticide chlorpyrifos. The main advantage of this optical biosensor is the use of a single sol–gel film with immobilized AChE Read More …
Optical sensing systems for microfluidic devices: A review
This review deals with the application of optical sensing systems for microfluidic devices. In the “off-chip approach” macro-scale optical infrastructure is coupled, while the “on-chip approach” comprises the integration of micro-optical functions into microfluidic devices. The current progress of the Read More …