A visual pH sensing film using natural dyes from Bauhinia blakeana Dunn

Zhang, Xiahong; Lu, Sisi; Chen, Xi

doi:10.1016/j.snb.2014.02.094

Cited by 183 publications

(96 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In the visible spectrum, the Ruellia simplex flower extract has an absorbance peak at a wavelength of about 535 nm. This wavelength value is similar to the wavelength value when the maximum absorbance is found in the Bauhinia blakeana dunn flower extract [9] or also grape skin extract [10]. The UV-visible spectrum for the Ruellia simplex flower extract on base condition (pH value of 11) is also measured (Figure 1.b).…”

Section: Resultssupporting

confidence: 76%

A paper-based Colorimetric Indicator Label using Natural Dye for Monitoring Shrimp Spoilage

Listyarini

Imawan²

2018

IOP Conf. Ser.: Mater. Sci. Eng.

View full text Add to dashboard Cite

Abstract. Shrimp is a type of perishable food. This study developed a simple indicator label using colorimetric method for monitoring shrimp freshness. This indicator label was made from natural dye extract of Ruellia simplex flowers which immobilized on cellulose paper by dip coating method. The indicator labels were used for examining freshness of shrimp. In this experiment, shrimp were stored in sealed bottles that have been labeled using the indicator and stored at 13 °C, 25 °C, and 40 °C for a certain range of time. Color changes of the indicator labels were observed using digital photography after shrimp storage for 0 h, 2 h, 17 h and 24 h. The color changes that occur were quantified and analyzed using the ImageJ program. The color of the indicator label when detecting the fresh shrimp was pink and after the shrimp spoilage began, the color of the label changed to purple and then became yellow when the shrimp is badly spoilage. The color change rates of label indicator increases as the shrimp storage temperature increased. These results indicate that this label indicator can be used as an indicator of the freshness of shrimps and it is not toxic and safe for food.

show abstract

Section: Resultssupporting

confidence: 76%

A paper-based Colorimetric Indicator Label using Natural Dye for Monitoring Shrimp Spoilage

Listyarini

Imawan²

2018

IOP Conf. Ser.: Mater. Sci. Eng.

View full text Add to dashboard Cite

show abstract

“…Visual pH sensing methods using natural dyes are in the focus of ongoing research (Zhang et al 2014) thanks to their convenient and non-destructive character.…”

Section: Most Common Methods For Ph Testingmentioning

confidence: 99%

pH and CO2 Sensing by Curcumin-Coloured Cellophane Test Strip

2015

View full text Add to dashboard Cite

2 pH and CO 2 sensing by curcumin coloured cellophane test strip ABSTRACTCurcumin coloured cellophane test strip -fabricated without any synthetic material -is used to determine in situ the instantaneous pH changes in liquids and in the air. A low cost, portable sensor array for possible medical and food-industrial application is developed. Next to the pH detection, curcumin coloured test strip can be applied as CO 2 monitoring sensor, too. On-going processes and the structural changes are followed by UV-VIS spectrophotometer, ATR-FTIR and AFM.

show abstract

“…In general pH sensing, chemical pigments are used as sensitive dyes such as bromocresol green, bromocresol purple, bromophenol blue and cresol red [7]. However, it is difficult to meet consumers' expectations for food safety due to their possible toxicity.…”

Section: Introductionmentioning

confidence: 99%

“…Anthocyanins are a large group of natural dyes used to monitor pH variations due to the presence of phenolic or conjugated substances. There have been several studies of anthocyanins extracted from Bauhinia blakeana Dunn and grape as pH indicator dyes [7,9]. They found that the color clearly altered from red to green in the pH range of 2-9 and that films that incorporate these compounds could be used to visually monitor the spoilage of pork.…”

Section: Introductionmentioning

confidence: 99%