Physicochemical Properties and Oxidative Storage Stability of Milled Roselle (Hibiscus sabdariffa L.) Seeds

Abstract

Milled Roselle (Hibiscus sabdariffa L.) seeds of the UMKL cultivar were analyzed for proximate composition, water and oil absorption capacity, and the influence of storage conditions on storage stability. The storage stability was determined under four types of conditions: light/oxygen (air) (LO), light/nitrogen (LN), darkness/oxygen (air) (DO), and darkness/nitrogen (DN) while monitoring for seven consecutive months. During the storage period, the formation of volatiles was determined using dynamic headspace sampling and Gas Chromatography-Mass Spectrometry (GC-MS) analysis. In total, 85 volatiles were identified, mainly aldehydes, alcohols, ketones, furans, and acids indicating lipid oxidation. It is recommended that milled Roselle seeds should be flushed with nitrogen and stored in darkness. Under these conditions, the seeds can be stored for at least three months without changes in volatile profile. This is important to ensure the good quality of milled Roselle seeds for further commercialization.

The Potential of Roselle (<i>Hibiscus sabdariffa</i>) Plant in Industrial Applications: A Promising Source of Functional Compounds

“…Milling reduces cooking time and improves the palatability of the products created using seeds. Previous study determined the influence of oxygen and different light conditions on the oxidative stability of milled sun-dried roselle seeds recommended the milled roselle seed to be flushed with nitrogen and stored in the dark to retain its flavor 9) . A total of 85 volatile compounds including aldehydes, alcohols, ketones, furans, and acids were identified in the packed milled roselle seeds stored for 7 months.…”

Potential Application of Tetrapleura tetraptera and Hibiscus sabdariffa (Malvaceae) in Designing Highly Flavoured and Bioactive Pito with Functional Properties

“…Various laboratories across the globe have contributed to the determination of proteins, fatty acid profile, essential oil composition, carbohydrates, crude fibre, total phenolic content, flavonoids, and minerals of HS in order to understand and utilise HS or its components in intervention studies. Juhari and Petersen [85] screened the seeds of HS and found them to contains moisture (8.4 ± 0.10%), protein (21.3 ± 0.9%), total dietary fibre (47.3 ± 1.4%), carbohydrate (0.3 ± 0.1%), lipids (16.2 ± 0.5%), and ash (6.5 ± 0.0%). Salah and Hayat [86] investigated HS seed flour and defatted flour for their proximate composition, nitrogen solubility, and functional properties of protein isolates.…”