Physicochemical Quality, Antioxidant Capacity and Nutritional Value in Tuberous Roots of Some Wild Dahlia Species

Abstract

The aim of this research was to evaluate the physicochemical quality, antioxidant capacity and nutritional value in tuberous roots of some wild dahlia species. The experiment was carried out in the Department of Plant Science of the Autonomous University Chapingo, Mexico. Plants were established in a randomized complete block design with five replications. The total soluble solids (TSS), titratable acidity (TA), vitamin C (VC), total phenols (TP), antioxidant capacity (AC), inulin and its proximate composition were evaluated. Among the materials analyzed, the most outstanding wild species were Dahlia campanulata, D. coccinea and D. brevis, where D. campanulata stood out for its concentration of VC (0.05 mg 100 g-1), AC (1.88 mg VCEAC g-1), inulin, DM and TC (72.25, 24.38 and 88.37%, respectively), however, the inulin content was similar to D. coccinea (66.17%), which was also outstanding with respect to the content of TP (1.74 mg GA g-1). Likewise, D. brevis presented the highest values of RFi (5.49%) and A (78.42%). According to our results, the tuberous roots of wild dahlia species can be used as food, as well as being a source of selection of traits of nutraceutic interest for genetic improvement.
 
 *********
 In press - Online First. Article has been peer reviewed, accepted for publication and published online without pagination. It will receive pagination when the issue will be ready for publishing as a complete number (Volume 47, Issue 3, 2019). The article is searchable and citable by Digital Object Identifier (DOI). DOI link will become active after the article will be included in the complete issue.
 *********

Nutritional and functional compounds in dahlia flowers and roots

“…The ash contents were 7.19 ± 0.08 g 100 g -1 and 6.32 ± 0.08 g 100 g -1 for the flowers and roots, respectively (Table 1). These results were much higher than those reported by Nsabimana & Jiang (2011) but like those found in other studies of dahlia (Espejel et al, 2019;Rivera-Espejel et al, 2019). The ash content in the food corresponds to the amount of minerals, and the chemical composition of the soil is one of the factors that most influences the portion of ash in the food because this component is the result of complex interactions between minerals in the soil and in the tissues in the entire plant.…”

“…The flower and root had higher TSS (Table 1) than those of Espejel et al (2019) and Rivera-Espejel et al (2019) (0.10 to 0.20 g 100 g -1 for flower and 4.98 to 9.11 for root). The values found for roots were comparable to those found by Silva et al (2018) in yacón roots (8.58 to 13.6 g 100 g -1 ), which belong to the same family.…”

“…The flowers showed values close to those observed by Espejel et al (2019), who found a maximum content of 90 mg of ascorbic acid 100 g -1 for the different dahlia species, while the value was high when compared to that of Lara-Cortés et al (2014) (0.05 mg of ascorbic acid 100 g -1 ). This difference may have been due to the genotype, the part sampled, and the edaphoclimatic conditions of cultivation, all factors that influence the concentration of ascorbic acid in plants (Rivera-Espejel et al, 2019).The ascorbic acid contents observed in the present study for the dahlia root and flower were higher than those of some fruits and vegetables considered rich in this substance, such as orange (47.3 mg 100 g -1 ), guava (89.9 mg 100 g -1 ), strawberry (69.8 mg 100 g -1 ), and broccoli (43.3 mg 100 g -1 ) (Tabela Brasileira de Composição de Alimentos, 2020). In addition, according to the Regulation for the Recommended Daily Intake (RDI) of protein, vitamins and minerals, the recommended daily amount of vitamin C is 45 mg (Brasil, 2005); thus, approximately 44 grams of petals or 29 grams of dahlia root would satisfy this need.…”

“…Dahlia's tuberous roots and flowers have potential as functional, medicinal, and gastronomic foods. Its tuberous roots have a high content of carbohydrates, including inulin and fibre, proteins, vitamins, minerals, and bioactive compounds that can benefit human health (Lara-Cortés et al, 2014;Ciobanu et al 2016;Rivera-Espejel et al, 2019). Inulin has been widely used in the food industry as a supplement, as a substitute for macronutrients, and also as a substrate for probiotics.…”

Processing of Red Dahlia Tubers in Produce Inulin Extract and Material Proximate Testing

“…Proximate analysis of red dahlia tuber material can be tested from the content of water, ash, fat, crude fiber, protein, and carbohydrates according to AOAC (Association Of Official Analytical Chemist) (Rivera-Espejel et al, 2019;Yudhistira et al, 2021). Water content and ash content using the Gravimetric method, protein content using the Khedjal method, fat content using the Soxhlet method, carbohydrate content using the Carbohydrate by difference method (Hilman et al, 2021).…”