Characterization of Spray-Dried Microcapsules of Paprika Oleoresin Induced by Ultrasound and High-Pressure Homogenization: Physicochemical Properties and Storage Stability

Abstract

As an indispensable process in the microencapsulation of active substances, emulsion preparation has a significant impact on microencapsulated products. In this study, five primary emulsions of paprika oleoresin (PO, the natural colourant extracted from the fruit peel of Capsicum annuum L.) with different particle sizes (255–901.7 nm) were prepared using three industrialized pulverization-inducing techniques (stirring, ultrasound induction, and high-pressure homogenization). Subsequently, the PO emulsion was microencapsulated via spray drying. The effects of the different induction methods on the physicochemical properties, digestive behaviour, antioxidant activity, and storage stability of PO microencapsulated powder were investigated. The results showed that ultrasound and high-pressure homogenization induction could improve the encapsulation efficiency, solubility, and rehydration capacity of the microcapsules. In vitro digestion studies showed that ultrasound and high-pressure homogenization induction significantly increased the apparent solubility and dissolution of the microcapsules. High-pressure homogenization induction significantly improved the antioxidant capacity of the microcapsules, while high-intensity ultrasound (600 W) induction slowed down the degradation of the microcapsule fats and oils under short-term UV and long-term natural light exposure. Our study showed that ultrasound and high-pressure homogenization equipment could successfully be used to prepare emulsions containing nanoscale capsicum oil resin particles, improve their functional properties, and enhance the oral bioavailability of this bioactive product.

Optimizing Encapsulation: Comparative Analysis of Spray-Drying and Freeze-Drying for Sustainable Recovery of Bioactive Compounds from Citrus x paradisi L. Peels

“…Wettability for both spray-dried powder and freeze-dried powder was evaluated using methods adapted from Zhang et al [31] and Wang et al [32], respectively. In each test, 1 g of the sampler was added to 100 mL of water at room temperature, and the time until complete dissolution or disappearance from the water's surface was recorded.…”

Study on Soil Selenium-Induced Copper Deficiency in Yudong Black Goats

“…The study site is located in Muye Township, Youyang County, Chongqing Municipality, in the Wuling Mountains (29 • 6 ′ -30 • 15 ′ N, 108 • 59 ′ -107 • 54 ′ E), which belongs to the typical mountainous farming and animal husbandry counties and goat production counties in China. The experimental site belongs to the subtropical monsoon climate with a poster height of 263-1895 m, a frost-free period of 286 days, terrain undulation, average annual temperature 13 • C, abundant rainfall throughout the year, average annual precipitation of 1400 mm, with rainfall concentrated in June to August [12]. The main plant types are white fescue, Arctostaphylos, wild kudzu, plantain, fireweed, arrowroot, and sumac.…”