Abstract
Methods are proposed for analyzing acai. They start with gravimetric methods for total lipids and insoluble solids, 1H-NMR to determine the relative distribution of the types of lipids, CPMAS 13C-NMR to analyze insoluble solids, and ICP-AES to measure the amounts of total Ca, Mg, K and P. The ratio of K to Ca can be used to distinguish between acai products and grape juice. These methods were used to analyze samples. The total lipids were 46.7±2.5%, as triglycerides. The triglycerides contained 24.8±2.8% saturated fatty acyls, 66.1±2.8% mono-, 7.58±0.52% di- and 1.46±0.05% omega-3 unsaturated fatty acyls. A CPMAS 13C-NMR spectrum of the insoluble solids contained peaks due to C=O and/or phenolic carbons, aromatic carbons, glycosidic carbons and aliphatic carbons, with chemical shifts and peak sizes that were different from those of other types of insoluble fibers. HPLC and LC–MS/MS found cyanidin-3-Oglucoside and cyanidin-3-O-rutinoside. Anion chromatography found lactate, acetate, formate, galacturonate, chloride, sulfate, malate, oxalate, phosphate, inositol hexaphosphate (phytic acid), citrate and isocitrate. No Salmonella, coliform bacteria, pesticides, herbicides, fungicides or industrial chemicals were found in genuine Brazilian acai.
Keywords: Acai, triglycerides, NMR, ion chromatography, phytic acid, potassium, calcium, pulp, aroma, magnsium
The Natural Products Journal
Title:Proposed Benchmark Methods for Analyzing Acai (Euterpe oleraceae Mart.)
Volume: 2 Issue: 2
Author(s): Robert E. Smith, Janete Eaker, Kevin Tran, Cynthia Smith, Douglas M. Monroe, Ellen M. da Silva Menezes, Armando U. O. Sabaa-Srur, Rensheng Luo, Wei Wycoff and William H. Fales
Affiliation:
Keywords: Acai, triglycerides, NMR, ion chromatography, phytic acid, potassium, calcium, pulp, aroma, magnsium
Abstract: Methods are proposed for analyzing acai. They start with gravimetric methods for total lipids and insoluble solids, 1H-NMR to determine the relative distribution of the types of lipids, CPMAS 13C-NMR to analyze insoluble solids, and ICP-AES to measure the amounts of total Ca, Mg, K and P. The ratio of K to Ca can be used to distinguish between acai products and grape juice. These methods were used to analyze samples. The total lipids were 46.7±2.5%, as triglycerides. The triglycerides contained 24.8±2.8% saturated fatty acyls, 66.1±2.8% mono-, 7.58±0.52% di- and 1.46±0.05% omega-3 unsaturated fatty acyls. A CPMAS 13C-NMR spectrum of the insoluble solids contained peaks due to C=O and/or phenolic carbons, aromatic carbons, glycosidic carbons and aliphatic carbons, with chemical shifts and peak sizes that were different from those of other types of insoluble fibers. HPLC and LC–MS/MS found cyanidin-3-Oglucoside and cyanidin-3-O-rutinoside. Anion chromatography found lactate, acetate, formate, galacturonate, chloride, sulfate, malate, oxalate, phosphate, inositol hexaphosphate (phytic acid), citrate and isocitrate. No Salmonella, coliform bacteria, pesticides, herbicides, fungicides or industrial chemicals were found in genuine Brazilian acai.
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E. Smith Robert, Eaker Janete, Tran Kevin, Smith Cynthia, M. Monroe Douglas, M. da Silva Menezes Ellen, U. O. Sabaa-Srur Armando, Luo Rensheng, Wycoff Wei and H. Fales William, Proposed Benchmark Methods for Analyzing Acai (Euterpe oleraceae Mart.), The Natural Products Journal 2012; 2 (2) . https://dx.doi.org/10.2174/2210315511202020076
DOI https://dx.doi.org/10.2174/2210315511202020076 |
Print ISSN 2210-3155 |
Publisher Name Bentham Science Publisher |
Online ISSN 2210-3163 |
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