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BACKGROUND: Kenaf seeds are underutilized kenaf plant by‐products, containing essential nutrients including dietary fiber (DF), which can be potentially utilized as food ingredients. The present study aimed to evaluate the physicochemical characteristics of kenaf seed fiber fractions extracted from kenaf seed. RESULTS: Defatted kenaf seed powder yielded four DF fractions: alkali‐soluble hemicellulose (146.4 g kg−1), calcium‐bound pectin (10.3 g kg−1) and acid‐soluble pectin (25.4 g kg−1) made up the soluble fibre fraction, whereas cellulose (202.2 g kg−1) comprised the insoluble fraction. All fractions were evaluated for their physicochemical properties. The DF fractions contained glucose, mannose, xylose and arabinose, and a small amount of uronic acid (1.2–2.7 g kg−1). The isolated pectin fractions had a low degree of esterification (14–30%). All the isolated DF fractions had high average molecular weights ranging from 0.3 to 4.3 × 106 g mol−1. X‐ray diffractogram analysis revealed that the fractions consisted mainly of an amorphous structure with a relative crystallinity ranging from 31.6% to 44.1%. The Fourier‐transform infrared spectroscopy spectrum of kenaf seed and its DF fractions showed typical absorption of polysaccharides, with the presence of hydroxyl, carboxyl, acetyl and methyl groups. Scanning electron microscopy analysis demonstrated that the raw material with the rigid structure resulted in soluble and insoluble DF fractions with more fragile and fibrous appearances, respectively. The soluble DF demonstrated greater flowability and compressibility than the insoluble fractions. CONCLUSION: These findings provide novel information on the DF fractions of kenaf seeds, which could be used as a potential new DF for the food industry. © 2023 Society of Chemical Industry. [ABSTRACT FROM AUTHOR]

Summary: Meat has historically been an essential source of animal‐based protein. However, due to population growth, health problems linked to the consumption of red meat, and concerns over environmental challenges, there is an increased need for alternative protein sources. Various plant‐based meat alternatives have recently been explored, with ongoing advancements in industrial‐scale production. Mycoprotein has been proposed as a sustainable alternative to meat due to its distinctive functional food properties and fibrous structure. However, some challenges still prevail related to large‐scale production, texture, sustainability, and acceptability of mycoprotein products. This review paper provides a comprehensive overview of scientific research on mycoprotein, focusing on nutritional composition, functional properties, production technology, and health benefits. This study also examines the current challenges related to product safety, environmental impact, and prospects of this innovative food. [ABSTRACT FROM AUTHOR]