The Fatty Acid Composition and Quality of Oils from Post-Industrial Waste of Quince Chaenomeles japonica

Development of an Innovative Optoelectronic Nose for Detecting Adulteration in Quince Seed Oil

In this study, an innovative odor imaging system capable of detecting adulteration in quince seed edible oils mixed with sunflower oil and sesame oil based on their volatile organic compound (VOC) profiles was developed. The system comprises a colorimetric sensor array (CSA), a data acquisition unit, and a machine learning algorithm for identifying adulterants. The CSA was created using a method that involves applying a mixture of six different pH indicators (methyl violet, chlorophenol red, Nile blue, methyl orange, alizarin, cresol red) onto a Thin Layer Chromatography (TLC) silica gel plate. Subsequently, difference maps were generated by subtracting the "initial" image from the "final" image, with the resulting color changes being converted into digital data, which were then further analyzed using Principal Component Analysis (PCA). Following this, a Support Vector Machine was employed to scrutinize quince seed oil that had been adulterated with varying proportions of sunflower oil and sesame oil. The classifier was progressively supplied with an increasing number of principal components (PCs), starting from one and incrementally increasing up to five. Each time, the classifier was optimized to determine the hyperparameters utilizing a random search algorithm. With one to five PCs, the classification error accounted for a range of 37.18% to 1.29%. According to the results, this novel system is simple, cost-effective, and has potential applications in food quality control and consumer protection.

Chaenomeles Species-Characteristics of Plant, Fruit and Processed Products: A Review

This literature review deals with the characteristics of Chaenomeles species and the physicochemical properties of Chaenomeles fruits. These fruits belong to a group with a low content of monosaccharides and a favorable ratio of fructose to glucose. They exhibit a low pH value and sour taste; therefore, they are not eaten in a raw form. They have a high concentration of bioactive compounds, such as polyphenols, vitamin C, organic acids, dietary fiber and pectins. The physicochemical properties of processed Chaenomeles fruits, i.e., freeze-dried, juices, syrups, candied fruit, jam, powder and chips, are presented in the manuscript. Also mentioned are the seeds and their use in the production of oil and seed gum. Of the products described in the paper, seed oil deserves greater attention, as it is characterized by a high content of unsaturated fatty acids, mainly oleic and linoleic, and low susceptibility to oxidation.

Japanese Quince Seeds as a Promising Rich Source of Proteins and Essential Amino Acids

The Japanese quince (Chaenomeles japonica) seeds (JQS) are generated in large amounts as a by-product in considerable quantities during industrial quince fruit processing. Due to economic, environmental, and nutritional reasons, the utilization of JQS as a protein source seems to be highly justified. Therefore, three cultivars were studied, 'Rasa', 'Rondo', and 'Darius' of JQS as a protein source during three harvesting years. The total protein content in JQS determined by the Kjeldahl method amounted from 24.6 to 33.2% and was significantly affected (p ≤ 0.05) by the cultivar and harvesting year. The protein isolation was most effective in the pH range of 6-9, and their profile was mainly characterized by a molecular weight of 54.1-57.7 kDa and 70.0-77.6 kDa. The amino acids profile of JQS turned out to be valuable from a nutritional point of view due to the relatively high content of essential and relatively essential amino acids such as histidine (6-9%), leucine (11-12%), lysine (10-16%), phenylalanine (12-16%), glutamine/glutamic acid (7-15%), and tyrosine (9-13%). The initial analysis of JQS indicates that they can be a good source of proteins characterized by a favorable amino acid profile.

Extraction and Characterization of the Polar Lipid Fraction of Blackberry and Passion Fruit Seeds Oils Using Supercritical Fluid Extraction

The study of the phytochemical composition of seed oils is of upmost importance for the food and cosmetic industries, mainly considering their associated biological properties. Extraction of seed oils using supercritical fluids (SFE) is an ecological and green alternative to conventional extraction processes since it is able to provide with potent bioactive extracts, avoiding degradation and transformation of the compounds present originally in the raw material. The objective of the present work was the extraction of pure fractions of polar lipids and their chemical characterization using chromatographic techniques such as GC-MS and LC-DAD-MS/MS of blackberry (Rubus glaucus) and passion fruit (Passiflora edulis) seed oils extracted by supercritical carbon dioxide. Oleamides derived from oleic acid were identified as the main compounds in both samples; in particular, 9-octadecenamide was the major identified oleamide. Besides, the extract obtained from passion fruit showed to be a source of linoleic acid, while the SFE extract from blackberry presented important concentrations of vanillin. The chemical composition of these seed oils can be of high interest for their further use in cosmetics and food industry.

Profiling of the lipophilic components of seed oils recovered from twelve Japanese quince (Chaenomeles japonica) genotypes

The seeds and oil yield and profile/levels of fatty acids, tocopherols and phytosterols in seed oils of twelve Japanese quince (Chaenomeles japonica) genotypes were studied. The seeds and oil yield ranged from 3.8 to 5.7% w/w fresh fruit, and 10.9 to 14.6% w/w dry weight seeds, respectively. The range of three predominated fatty acids C16:0, C18:1 and C18:2 in the seed oil of twelve Japanese quince genotypes were 8.1-9.8, 37.5-48.1, and 40.1-50.3%, respectively. α-Tocopherol and β-sitosterol were the main minor lipophilic compounds detected in all investigated genotypes. The percentage of predomination of α-tocopherol and β-sitosterol in each investigated genotype was very similar and amounted to 97-99% of total tocopherols and 76-80% of total phytosterols, respectively. The range of total content tocopherols and phytosterols in 12 genotypes of Japanese quince were 91.9-129.3 and 7830-14166 mg/100 g oil, respectively.