Chemical Composition, Antioxidant Properties, and Thermal Stability of a Phytochemical Enriched Oil from Açai ( Euterpe oleracea Mart.)
Department of Nutrition and Food Science, Texas A&M University, College Station, Texas 77843, USA. Journal of Agricultural and Food Chemistry
(Impact Factor: 2.91).
06/2008; 56(12):4631-6. DOI: 10.1021/jf800161u
Phenolic compounds present in crude oil extracts from acai fruit ( Euterpe oleracea) were identified for the first time. The stability of acai oil that contained three concentrations of phenolics was evaluated under short- and long-term storage for lipid oxidation and phenolic retention impacting antioxidant capacity. Similar to acai fruit itself, acai oil isolates contained phenolic acids such as vanillic acid (1,616 +/- 94 mg/kg), syringic acid (1,073 +/- 62 mg/kg), p-hydroxybenzoic acid (892 +/- 52 mg/kg), protocatechuic acid (630 +/- 36 mg/kg), and ferulic acid (101 +/- 5.9 mg/kg) at highly enriched concentrations in relation to acai pulp as well as (+)-catechin (66.7 +/- 4.8 mg/kg) and numerous procyanidin oligomers (3,102 +/- 130 mg/kg). Phenolic acids experienced up to 16% loss after 10 weeks of storage at 20 or 30 degrees C and up to 33% loss at 40 degrees C. Procyanidin oligomers degraded more extensively (23% at 20 degrees C, 39% at 30 degrees C, and 74% at 40 degrees C), in both high- and low-phenolic acai oils. The hydrophilic antioxidant capacity of acai oil isolates with the highest phenolic concentration was 21.5 +/- 1.7 micromol Trolox equivalents/g, and the total soluble phenolic content was 1252 +/- 11 mg gallic acid equivalents/kg, and each decreased by up to 30 and 40%, respectively, during long-term storage. The short-term heating stability at 150 and 170 degrees C for up to 20 min exhibited only minor losses (<10%) in phenolics and antioxidant capacity. Because of its high phenolic content, the phytochemical-enriched acai oil from acai fruit offers a promising alternative to traditional tropical oils for food, supplements, and cosmetic applications.
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- "Some of these metabolites were isolated for the first time from the genus Rudbeckia. Syringic acid which was identified in the leaf extracts of R. fulgida Aiton was also found in the açaí palm (Euterpe oleracea Mart.) and oil palm (Pacheco-Palencia et al., 2008). It was studied that accumulation of phenolic acids, especially syringic acid, may prove a useful trait in breeding resistant oil palm cultivars to the Ganoderma boninense Pat. "
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ABSTRACT: Bioactive phenolic compounds are powerful antioxidants in traditionally used medicinal and industrial crop plants got an increased interest last years in their application and role in the non-destructive methodology for pre-screening analysis of some stress factors.In this study the qualitative target was linked with future possible application of received data for improving non-destructive methodology as well as for improving existing knowledge regarding antioxidants content in some plant species. It was investigated comparative analysis of total phenolics, flavonoids contents, phenolic acids composition, and antioxidant activity in known east central Europe medicinal and industrial crop plants of 26 species of families Asteraceae, Rosaceae and Lamiaceae.Among investigated leaf extracts has been shown highest total phenolic, total flavonoid contents and antioxidant activity for Stachys byzantineL. (Lamiaceae), Calendula officinalisL. (Asteraceae) and for Potentilla rectaL. (Rosaceae). The highest syringic acid content has been found in the leaf extracts of plants family Asteraceae - in range from 0.782 - 5.078 mg g-1 DW. The representative’s family Rosaceae has higher content of p-anisic acid in range 0.334-3.442 mg g-1DW compared to the leaf extracts of families Lamiaceae and Asteraceae. The comparative study showed significant differences of content of phenolic acids in the leaf extracts of different representative’s families Rosaceae, Asteraceae and Lamiaceae. We suggest that presence of some phenolic acid can be used as possible marker for family botanical specification of representative’s families Asteraceae and Rosaceae. It was supposed that some pharmacological effects can be connected with analyzed data.
Available from: Jaroslaw Moldoch
- "    Euterpe oleraceae (Acai), a large palm tree indigenous to the Amazon River, had been evaluated for phenolic constituents and their biological activity.    Due to the structural complexity of PAC derivatives and high difficulties in their separation, studies on these compounds are limited in comparison with other polyphenols.   Usually, catechins give unresolved high-performance liquid chromatography (HPLC) peaks, due to the similarity in their structures and also to the large number of phenolic groups that can give the same interactions with chromatographic stationary phase. "
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ABSTRACT: Medemia argun is an ancient palm rich in proanthocyanidins (PACs). These polyphenolic compounds are widely distributed in plants and are an integral part of the human diet. A sensitive high-performance liquid chromatography and electrospray ionization mass spectrometry (HPLC-ESI-MS) method in the negative ion mode for sequencing these ubiquitous and highly beneficial antioxidants is described in order to profile different PACs in M. argun nuts. The analytical protocol based on tandem mass spectrometry was used to sequence dimers, trimers, tetramers and pentamers with different A-type, B-type and A/B-type linkages. Diagnostic ions resulting from heterocyclic ring fission and retro-Diels-Alder reaction of flavan-3-ol provided information on the hydroxylation pattern and the type of interflavan bond. The sequences were discovered through ions derived from quinone methide cleavage of the interflavan bond. The identification of PACs linkages through LC-MS(n) eliminates a number of tedious separation steps. The method was successfully applied to give a view of PAC profile in M. argun nuts. M. argun nuts contained 636.88 mg/g PACs (as equivalent of (þ)-catechin). The data obtained in our research show that M. argun is a rich source of hydrolyzable PACs. Copyright © 2014 John Wiley & Sons, Ltd.
Available from: Souravh Bais
- "Fruits of Ficus species are rich source of polyphenolic compounds and flavanoids which are responsible for strong antioxidant properties that help in prevention and therapy of various oxidative stress related diseases such as neurodegenerative and hepatic diseases. Acai oil, obtained from the fruit of the Acaí palm (Euterpe oleracea) , is rich in protocatechuic acid (630 ± 36 mg/kg). Acai oil has a relatively high content of polyphenols, which in turn has been linked to a range of reported (mostly in vitro) antioxidant, anti-inflammatory, antiproliferative, and cardioprotective properties. "
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ABSTRACT: Flavonoids and polyphenols are heterocyclic molecules that have been associated with beneficial effects on human health, such as reducing the risk of various diseases like cancer, diabetes, and cardiovascular and brain diseases. Protocatechuic acid (PCA) is a type of widely distributed naturally occurring phenolic acid. PCA has structural similarity with gallic acid, caffeic acid, vanillic acid, and syringic acid which are well-known antioxidant compounds. More than 500 plants contain PCA as active constituents imparting various pharmacological activity and these effects are due to their antioxidant activities, along with other possible mechanisms, such as anti-inflammatory properties and interaction with several enzymes. Over the past two decades, there have been an increasing number of publications on polyphenols and flavonoids, which demonstrate the importance of understanding the chemistry behind the antioxidant activities of both natural and synthesized compounds, considering the benefits from their dietary ingestion as well as pharmacological use. This work aims to review the pharmacological effects of PCA molecules in humans and the structural aspects that contribute to these effects.
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