Organic Acids in the Juice of Acid Lemon and Japanese Acid Citrus by Gas Chromatography

Widodo, Soesiladi E.; Shiraishi, Masayuki; Shiraishi, Shinya

doi:10.5109/24091

Cited by 4 publications

(1 citation statement)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…That review tabulated conditions of liquid chromatographic (HPLC) and electrophoretic methods. Several gas chromatography (GC) methods were also described earlier. , Attractive techniques were developed to trap the analytes on anion exchange resins, methylate them in situ, and perform supercritical fluid extraction prior to GC analysis . The general availability of GC-MS in many laboratories makes this particularly attractive; direct analysis without derivatization is possible in many cases .…”

Section: Introductionmentioning

confidence: 99%

Anion Composition of Açaı́ Extracts

Liao

Shelor

Chen

et al. 2013

J. Agric. Food Chem.

View full text Add to dashboard Cite

Many products labeled açaı́ are presently marketed as natural supplements with various claimed health benefits. Authentic açaı́ is expensive; as a result, numerous products labeled as containing açaı́ are being sold that actually contain little or no açaı́. Authentic açaı́ samples from Brazil and Florida as well as several reputed açaı́ products were analyzed by suppressed conductometric anion chromatography. Columns with different selectivities were used to obtain a complete separation of all anions. Tandem mass spectrometry was used for confirmation of the less common ions. Quinate, lactate, acetate, formate, galacturonate, chloride, sulfate, malate, oxalate, phosphate, citrate, isocitrate, and myo-inositol hexakisphosphate (phytate) were found. Only the Florida açaı́ had detectable levels of hexanoate. No açaı́ sample had any detectable levels of tartrate, which is present in abundance in grape juice, the most common adulterant. The highly characteristic anion profile and in particular the absence of tartrate can readily be used to identify authentic açaı́ products. Açaı́ from Florida had a 6 times greater level of phytate. The present analytical approach for phytate may be superior to extant methods.

show abstract

Section: Introductionmentioning

confidence: 99%

Anion Composition of Açaı́ Extracts

Liao

Shelor

Chen

et al. 2013

J. Agric. Food Chem.

View full text Add to dashboard Cite

show abstract

Analysis of organic acids

Chahardoli

Jalilian

Memariani

et al. 2020

Recent Advances in Natural Products Analysis

View full text Add to dashboard Cite

X-ray Fluorescence Analysis of Rare Earth Elements in Rocks Using Low Dilution Glass Beads

Nakayama

Nakamura

2005

ANAL. SCI.

View full text Add to dashboard Cite

in igneous rocks were assayed with fused lithium borate glass beads using X-ray fluorescence spectrometry. Low dilution glass beads, which had a 1:1 sample-to-flux ratio, were prepared for determination of rare earth elements. Complete vitrification of 1:1 mixture required heating twice at 1200˚C with agitation. Extra pure reagents containing determinants were used for calibrating standards instead of the rock standard. The calibration curves of the 23 elements showed good linearity. Furthermore, the lower limits of detection corresponding to three times the standard deviation for blank measurements were 26 mass ppm for Na2O, 6.7 for MgO, 4.5 for Al2O3, 4.5 for SiO2, 18 for P2O5, 1.1 for K2O, 4.0 for CaO, 3.9 for TiO2, 1.6 for MnO, 0.8 for Fe2O3, 0.5 for Rb, 0.2 for Sr, 0.4 for Y, 0.5 for Zr, 3.3 for La, 6.5 for Ce, 2.7 for Pr, 2.1 for Nd, 1.7 for Sm, 0.7 for Gd, 2.7 for Dy, 0.5 for Th, and 0.6 for U. Using the present method, we determined the contents of these 23 elements in four rhyolitic and granitic rocks from Japan.

show abstract

Organic Acids in the Juice of Acid Lemon and Japanese Acid Citrus by Gas Chromatography

Cited by 4 publications

References 6 publications

Anion Composition of Açaı́ Extracts

Anion Composition of Açaı́ Extracts

Analysis of organic acids

X-ray Fluorescence Analysis of Rare Earth Elements in Rocks Using Low Dilution Glass Beads

Contact Info

Product

Resources

About