Simultaneous synergistic microwave–ultrasonic extraction and hydrolysis for preparation of trans-resveratrol in tree peony seed oil-extracted residues using imidazolium-based ionic liquid

Abstract

a b s t r a c tImidazolium-based ionic liquid-based microwave-ultrasonic synergistic simultaneous extraction and hydrolysis (IMUSEH) method was developed to obtain trans-resveratrol from tree peony (Paeonia rockii (S.G. Haw & Lauener) T. Hong & J.J. Li) seed oil-extracted residues, in which the basic ionic liquid aqueous solution was used for extraction and transformation of trans-resveratrol glycosides to free transresveratrol. Through comparison, 1-butyl-3-methylimidazolium imidazolide ([C 4 C 1 im]Im) was selected as a dual solvent-catalyst, which showed an excellent solvent effect and catalytic activity. After optimization by a factorial design and response surface methodology, a higher yield of trans-resveratrol (3.06 ± 0.12 mol/g) was obtained under optimal conditions (0.5 M [C 4 C 1 im]Im, 24 mL/g liquid-solid ratio, 25 min time, and 396 W microwave irradiation power). The developed technique was compared with ionic liquid-based microwave-assisted extraction and ionic liquid-based ultrasonic-assisted extraction based on first-order kinetic model and scanning electron microscopy, which highlighted the mechanism of the microwave-ultrasonic synergistic apparatus. Method validation studies showed that the proposed method can be used to prepare trans-resveratrol. The developed method showed promise in transforming glucoside to aglycone in plant materials.

Profiling and simultaneous quantitative determination of oligostilbenes in Paeonia ostii seed shell from different geographical areas in China and their comparative evaluation

“…As a popular traditional ornamental plant, Paeonia ostii T. Hong & J. X. Zhang (Paeoniaceae) has been widely cultivated in China for more than 2000 years due to its beautiful ornamental flowers and medicinal use of its roots . Cultivated tree peonies have nearly more than 1000 cultivars derived from a few traditional ones with particular characters in different regions after several thousand years of breeding.…”

“…In fact, the city of Luoyang, Heze, Linxia, Bozhou and Xiangyang are the most important peony cultivation areas in China. Oil tree peony is a new type of tree peony cultivar where the seed kernels can be used for the preparation of edible oil, and P. ostii or P. rockii are the only two oil peony cultivars authorised by the Ministry of Health of the People's Republic of China in March 2011 . The plantation area of oil tree peony is very large at present due to the high oil content (varies from 24.12% to 37.83%) in peony seed kernels and the high unsaturated fatty acid content (more than 90%) in peony seed oil …”

“…Paeonia ostii is a resilient peony variety with strong adaptability to climate, and can be planted in many parts of China . China is a vast country with very different natural environment and climate diversity in different regions.…”

The effects of process technology on the physicochemical properties of peony seed oil

“…Some studies reported that solvent extracts and essential oils of P. suffruticosa flower buds possess potential antimicrobial activities against some of the common food-borne bacterial pathogens (Han and Bhat, 2014;Wang et al, 2004). In the another study, the trans-Resveratrol, 3,5,4′-trihydroxy-trans-stilbene, a stilbenoid compound, known for its therapeutic and pharmacological activities was extracted from peony seeds by the imidazolium-based ionic liquidbased microwave-ultrasonic synergistic simultaneous extraction and hydrolysis methods (Chen et al, 2016). Also, peony seeds are the source of polysaccharides and four types of polysaccharides sequentially extracted from peony seed dregs have displayed strong antioxidant activities in a recent study (Shi et al, 2016).…”

Tolerance strategies revealed in tree peony (Paeonia suffruticosa; Paeoniaceae) ecotypes differentially adapted to desiccation

“…Nevertheless, severe water deficiency stress can limit the cultivation area, lead to smaller leaves and flowers, inhibit the synthesis of organic substances and flower pigments, and reduce the ornamental value and seed yield of tree peony (Li et al., ). Recent studies, however, have mainly focused on oil extraction (Chen et al., , b; Cui et al., ; Han et al., ). In addition, efficient protocols for the micropropagation of tree peony and the effects of different medium compositions and exogenous hormones on the browning of tree peony callus in tissue culture were recently investigated (Wen et al., ; Zhou et al., ).…”