Quality control of camellia oil based on HPLC fingerprinting techniques combined with chemometric methods for triglycerides

Triglycerides (TAGs) play an important role in the physiological function of vegetable oils. Camellia oil has a variety of good physiological functions. Therefore, a qualitative and quantitative method for the determination of TAGs in camellia oil by high-performance liquid chromatography-diode array detector/electro spray ionization mass spectrometry was developed. The 16 TAGs that separated were identified and quantified by peak-area normalization. In addition, the major TAGs in camellia oil were OOO (25.25%), OLO (20.72%), POL (9.23%), OLL (8.22%), and OOP (8.22%). Moreover, the content of oleic acid in camellia oil was 81.74%. Using fingerprint techniques, 15 common peaks in 12 samples were selected as characteristic peaks to evaluate the differences in the composition of camellia oil samples. In addition, the samples were further classified by chemometric methods. It is shown that the camellia oil samples with high similarity from two cities in the main producing areas of Zhejiang province could be further classified according to the planting areas by the combination of chromatographic fingerprints and chemometric methods.     

Fast chromatography of pulse triacylglycerols

A short 10-min ultra high performance liquid chromatography (UHPLC) method was used for separation and lipidomic analysis of triacylglycerols (TAGs) in 10 pulses: baby lima beans, black beans, black-eyed peas, butter beans, cranberry beans, garbanzo beans, green split peas, lentils, navy beans, and pinto beans. The lipids extracted using chloroform/methanol averaged 1.9–2.7% across all pulses except garbanzo beans, which gave 6.2% lipids. TAGs were analyzed using dual parallel mass spectrometry (LC1MS2), areas were integrated using LipidSearch 4.2 software, and percent relative TAG compositions were calculated. Fatty acid response factors were calculated by comparison to calibrated GC-FID, which were used to calculate response-factor adjusted TAG compositions. Principal component analysis revealed that the pulses separated into three clusters, which were further highlighted using hierarchical cluster analysis. A subset of TAGs was quantified using calibration curves made from alternating sets of regioisomers in the non-linear high concentration range (~2.5 nMol/ml to ~300 nMol/ml). A linear calibration curve for the sum of tocopherols detected by fluorescence was constructed with a coefficient of determination, r², >0.99 for low concentrations (0.50–50 μg/ml), but tocopherols in pulses appeared to be inefficiently extracted. TAG regioisomers were quantified based on a Critical Ratio (CR), [AA]⁺/[AB]⁺, interpolated between the CRs of two pure regioisomer standards taken from alternating calibration standards. TAG mole percent relative compositions are reported for the first time for most pulses and the compositions are given with more detail and specificity than previously reported.     

GC-MS分析食用油中甘油三酯的研究进展

介绍了GC-MS分析食用油中甘油三酯的几种情况,包括高温气相色谱(300℃)直接进样,将甘油三酯进行甲酯化处理的非高温气相色谱(300℃)非直接进样。并介绍了GC-氢离子火焰检测器直接进样和非直接进样技术。指出了这些技术在食用油甘油三酯的分析上取得的进展和存在的一些问题。     

The isolation and characterization of lipid compounds from black soldier fly larvae

With the global demand for lipid compounds on the rise, concerns are growing about the environmental and economic impact of traditional lipid sources. This concern is exacerbated by the ever-increasing demand for plant-based lipids, which is contributing to unsustainable production practices and competition for land and food. Considering this challenge, this work aimed at exploring the potential of black soldier fly larvae (BSFL) as a low-cost and ecofriendly source of lipid classes. A fractionation scheme consisting of a mixture of polar and nonpolar solvents at different ratios was employed to isolate the lipid classes from BSFL oil using silica gel column chromatography, which is a conventional method of chromatography. The fraction's separation efficiency was validated using thin-layer chromatography and characterized with Fourier-transformed infrared spectroscopy and gas chromatography flame ionization (GC-FID). Triglycerides (30%) were found to be the most abundant component while cholesterols (0.6%) were the least abundant lipid fractions in the lipid mixture. GC-FID in the various lipid fractions analyzed, lauric acid exhibited the highest percentage among the triglycerides (16.64%), diglycerides (19.10%), monoglycerides (22.70%), and free fatty acids (27.65%) fractions. The fractionation scheme proposed achieves high efficiency in separating and recovering different lipid classes extracted from the BSFL.