UPM Institutional Repository

Screening of natural colours from various natural resources as potential reusable visual indicators for monitoring food freshness


Abdul Rahim, Mohd. Zulkhairi and Husin, Nurdiyana and Mohd Noor, Mohd. Azizan and Yet, Zaida Rahayu and Ismail-Fitry, Mohammad Rashedi (2020) Screening of natural colours from various natural resources as potential reusable visual indicators for monitoring food freshness. Malaysian Journal of Analytical Sciences, 24 (2). 288 - 299. ISSN 1394-2506


Natural colours have emerged as an alternative source of colours due to the high demand and public sensitivity towards the risk of using synthetic colours. Natural colours are non-hazardous and made from renewable resources, in which the supply is abundant and not harmful to the environment. This study aims to screen naturally-derived colours from butterfly pea, red cabbage, turmeric, and beetroot as visual indicators in monitoring food freshness. The study was carried out in three stages: the extraction of natural colours, the absorption of natural colours on the indicator paper, and the application of visual indicators on the real sample. The results showed that all visual indicators changed their colours towards the spoilage of meat in 24-h monitoring at room temperature. The most significant colour change was observed on the natural colour from butterfly pea compared to other natural resources. HS-SPME-GC-FID analysis confirmed the presence of methylamine as the main volatile compound from the spoiled meat, which contributed to the colour change of the visual indicators. FTIR analysis of useable indicators indicated the presence of amine compound (N-H) that aligned with the result of HS-SPME-GC-FID. The used visual indicators returned to their initial colours and characteristics, which provide the possibility for the fabrication of reusable visual indicators in the future.

Download File

Full text not available from this repository.
Official URL or Download Paper: https://mjas.analis.com.my/mjas/v24_n2/v24_n2.html

Additional Metadata

Item Type: Article
Divisions: Faculty of Food Science and Technology
Publisher: Malaysian Society of Analytical Sciences
Keywords: Natural colour; Visual indicator; Meat freshness
Depositing User: Mohamad Jefri Mohamed Fauzi
Date Deposited: 24 Jan 2024 02:59
Last Modified: 24 Jan 2024 02:59
URI: http://psasir.upm.edu.my/id/eprint/87539
Statistic Details: View Download Statistic

Actions (login required)

View Item View Item