Water‐soluble vitamin content of sun‐dried Corinthian raisins (Vitis vinifera L., var. Apyrena)

Abstract

BACKGROUND: Corinthian raisins are dried vine products, representing approximately 3% of the world dried vine fruit production. The majority of Corinthian raisin production is of Greek origin. Studies on the B-group vitamin content of Corinthian raisins produced in Greece as well as on the effect of region and cultivation altitude on the B-group vitamin content are absent in the literature. RESULTS: Corinthian raisin vitamin content was evaluated by reversed-phase high-performance liquid chromatographyafter acid and enzymatic hydrolysis in terms of raisin subcategory, i.e. regions of cultivation, crop-to-crop variations, and cultivation altitude. Eight vitamers from five different vitamins were identified and quantified in Corinthian raisins. Vitamin B3 (0.77-2.82 g × 10 −2 × kg −1 ) was found to predominate, followed by B6 (0.27-0.37 g × 10 −2 × kg −1 ), B1 (0.19-0.22 g × 10 −2 × kg −1 ), and B2 (0.10-0.15 g × 10 −2 × kg −1 ). B9 content was up to 7.1 g × 10 −5 × kg −1 . Minor differences were observed among regions of cultivation, cultivation altitude and crop-to-crop variations.CONCLUSION: This study revealed the presence of several water-soluble vitamins in Corinthian raisins that, together with other health-promoting micronutrients present in the product, further reinforce its place as part of a healthy diet. ± 0.01b 5.7 ± 1.4b n, number of samples obtained in crop year 2013. Values in the same column not sharing lower-case letters indicate statistically significant differences among regions of cultivation at 95% confidence level. B1 is the sum of thiamine and thiamine pyrophosphate; Niacin is the sum of nicotinic acid and nicotinamide; B6 is the sum of pyridoxine and pyridoxamine.

Vitamins in wine: Which, what for, and how much?

“…To our knowledge, no study has been carried out to distinguish the vitamer proportions of each vitamin in grape musts and wines. However, a study performed on sun‐dried raisins for a few vitamers (Panagopoulou et al., 2019) provided an initial estimation of their distribution tendency in grapes (Table 2).…”

Nontargeted 1H NMR fingerprinting and multivariate statistical analysis for traceability of Greek PDO Vostizza currants

“…Likewise, differences in phytochemical and sugar content could be partially explained by a variety of factors (Teixeira et al., 2014). Different water percentage or moisture content of berries, environmental factors such as average temperature, sunshine, rainfall, or the drying process can highly contribute to their composition (Breksa et al., 2010; Panagopoulou et al., 2019; Serratosa et al., 2008). Furthermore, carbohydrates concentration in the samples depends on developmental stage, viticultural practices as well as on the genotype (Chiou, 2014; Clingeleffer, 2010; Kliewer et al., 2005; Liu et al., 2007; Shiraishi et al., 2010).…”

“…Currants are considered to be an excellent source of fibers, carbohydrates, minerals, vitamins, amino acids, triterpenes, fatty acids, and phenolic compounds (Carughi, 2008; Chiou et al., 2014). In comparison with other Corinthian currants, Vostizza is characterized by high quality, nutritional value and high percentage of anthocyanins (Chiou et al., 2014; Panagopoulou et al., 2019; Vasilopoulou & Trichopoulou, 2014). Besides the anthocyanins, Vostizza currants present lower total phenolics content and antiradical activity (Chiou et al, 2014).…”

Mediterranean Raisins/Currants as Traditional Superfoods: Processing, Health Benefits, Food Applications and Future Trends within the Bio-Economy Era

“…Apyrena), the Corinthian currants Vostizza and Sultana or "Sultanina" from the cultivation of Vitis vinifera L., cv. Sultanina [24,25]. Specifically, Zante currants are cultivated without irrigation and processed to dried product in the island of Zakynthos, using Vitis corinthica grapes [24].…”

“…It was evidenced that individual and total sugar profile was not significantly altered from the drying method. In a following study, Panagopoulou et al [25] presented an assessment of the vitamin B content of Corinthian raisins, within consecutive cultivation periods. Vitamin B 3 (7.7-28.2 mg/kg) exhibited the higher concentration, followed by B 6 (2.7-3.7 mg/kg), B 1 (1.9-2.2 mg/kg), and B 2 (1.0-1.5 mg/kg).…”