Extraction of policosanols from hydrolysed rice bran wax by high‐intensity ultrasound

Liu, Yuanfa; Yu, Jun; Wang, Xingguo

doi:10.1111/j.1365-2621.2006.01232.x

Cited by 11 publications

(5 citation statements)

References 21 publications

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“…During both processes, a considerable amount of by-product is produced, some of which contains more or less quantities of potential ingredients for functional food, nutraceuticals and pharmaceutical manufacture [ 9 ]. These ingredients include mainly of γ-oryzanol, tocotrienol, tocopherol, phytosterol, lecithin, carotenoids and long-chain alcohols [ 10 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

Comparative study on amount of nutraceuticals in by-products from solvent and cold pressing methods of rice bran oil processing

Wongwaiwech

Weerawatanakorn

Tharatha³

et al. 2019

Journal of Food and Drug Analysis

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Rice bran oil (RBO) has become a popular oil globally. However, the RBO extraction process leaves various residue products, which contain bioactive substances of varying potency which could be significant sources of functional ingredients for both food production and pharmaceutical manufacture. The objective of our study was to compare the bioactive substances in various by-products derived from the two rice bran oil processing methods; solvent extraction and cold pressing. The residues from solvent extraction processing contained up to 97.37 mg/100 g of γ-aminobutyric acid in defatted rice bran, and the rice acid oil contained high levels of vitamin E (tocopherols, tocotrienols), up to 120.59 mg/100 g, as well as γ-oryzanol (3829.65 mg/100 g), phytosterol (599.40 mg/100 g), and policosanol compounds (332.79 mg/100 g). All of these values are higher than in the residues derived from cold pressing. Importantly, high amounts of total nutraceuticals (8.3 kg/100 kg) were found in residues from both processing methods, indicating the commercial potential of these residues as a source of functional ingredients for food production, as dietary supplements, and in pharmaceutical manufacture.

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Section: Introductionmentioning

confidence: 99%

Comparative study on amount of nutraceuticals in by-products from solvent and cold pressing methods of rice bran oil processing

Wongwaiwech

Weerawatanakorn

Tharatha³

et al. 2019

Journal of Food and Drug Analysis

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“…39 In the present study, following the method of Cravotto et al 39 with some modification, a higher yield of policosanol was obtained (Table 1). Liu et al 47 reported that ultrasonic power is more important in the hydrolysis of RBW than ultrasonic frequency. This explains why good policosanol yield was achievable in this study even though low ultrasound frequency was used (50 Hz).…”

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confidence: 99%

Characterization of rice bran wax policosanol and its nanoemulsion formulation

Ishaka¹,

Imam²,

Mahamud³

et al. 2014

IJN

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Policosanol, a mixture of long-chain alcohols found in animal and plant waxes, has several biological effects; however, it has a bioavailability of less than 10%. Therefore, there is a need to improve its bioavailability, and one of the ways of doing this is by nanoemulsion formulation. Different droplet size distributions are usually achieved when emulsions are formed, which solely depends on the preparation method used. Mostly, emulsions are intended for better delivery with maintenance of the characteristics and properties of the leading components. In this study, policosanol was extracted from rice bran wax, its composition was determined by gas chromatography mass spectrophotometry, nanoemulsion was made, and the physical stability characteristics were determined. The results showed that policosanol nanoemulsion has a nanosize particle distribution below 100 nm (92.56–94.52 nm), with optimum charge distribution (−55.8 to −45.12 mV), pH (6.79–6.92) and refractive index (1.50); these were monitored and found to be stable for 8 weeks. The stability of policosanol nanoemulsion confers the potential to withstand long storage times.

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“…www.nature.com/scientificreports/ the extracted PCs changed through a multistep process. Liu et al 37 reported that crude PC extracted from RBW appeared dark brown, but after the purification step, the color of the obtained PCs changed to white powder. A comparison of γ-oryzanol, phytosterol and PC contents of extracts from transesterified FC and RBW using the SUBFDME and SE methods is shown in Table 4.…”

Section: Resultsmentioning

confidence: 99%

Subcritical dimethyl ether extraction as a simple method to extract nutraceuticals from byproducts from rice bran oil manufacture

Wongwaiwech

Weerawatanakorn

Boonnoun

2020

Sci Rep

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The byproducts of rice bran oil processes are a good source of fat-soluble nutraceuticals, including γ-oryzanol, phytosterol, and policosanols. This study aimed to investigate the effects of green technology with low pressure as the subcritical fluid extraction with dimethyl ether (SUBFDME) on the amount of γ-oryzanol, phytosterol, and policosanol extracted from the byproducts and to increase the purity of policosanols. The SUBFDME extraction apparatus was operated under pressures below 1 MPa. Compared to the chemical extraction method, SUBFDME gave the highest content of γ-oryzanol at 924.51 mg/100 g from defatted rice bran, followed by 829.88 mg/100 g from the filter cake, while the highest phytosterol content was 367.54 mg/100 g. Transesterification gave the highest extraction yield of 43.71% with the highest policosanol content (30,787 mg/100 g), and the SUBFDME method increased the policosanol level from transesterified rice bran wax to 84,913.14 mg/100 g. The results indicate that the SUBFDME method is a promising tool to extract γ-oryzanol and phytosterol and a simple and effective technique to increase the purity of policosanol. The study presented a novel technique for the potential use of SUBSFDME as an alternative low-pressure and low-temperature technique to extract γ-oryzanol and phytosterol. The combination of transesterification and the SUBFDME technique is a potential simple two-step method to extract and purify policosanol, which is beneficial for the manufacture of dietary supplements, functional foods and pharmaceutical products.

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Extraction of policosanols from hydrolysed rice bran wax by high‐intensity ultrasound

Cited by 11 publications

References 21 publications

Comparative study on amount of nutraceuticals in by-products from solvent and cold pressing methods of rice bran oil processing

Comparative study on amount of nutraceuticals in by-products from solvent and cold pressing methods of rice bran oil processing

Characterization of rice bran wax policosanol and its nanoemulsion formulation

Subcritical dimethyl ether extraction as a simple method to extract nutraceuticals from byproducts from rice bran oil manufacture

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