Abstract
Missing information on plant origin control and nutritional data on herbs, spices and vegetables could lead to sample quality deficit and misusage of the plant database. In this study, twenty vegetables that were collected and managed based on the recommendations of the Department of Agriculture, Ministry of Agriculture and Cooperatives, Thailand, were investigated regarding their proximate mineral, vitamin and carotenoid contents using the standard procedures of the Association of Official Analytical Chemists (AOAC). The results showed that these plants (100 g dry weight) exhibited similar energy levels (337.11-420.48 kcal), which were mainly distributed from high carbohydrate content (21.01-88.17 g), while protein (3.14-66.07 g) and fat (0.00-10.33 g) levels were quite low. As a form of carbohydrate, dietary fiber was found to be high in Cymbopogon citratus (DC.) Stapf (Cy. citratus) and Solanum torvum Sw. (So. torvum) (57.00-59.54 g). Interestingly, Senegalia pennata subsp. insuavis (Lace) Maslin, Seigler & Ebinger (S. pennata) exhibited exceptionally high protein content, which was between 2.3 and 3.1 times higher than its carbohydrates. High mineral contents were detected in S. pennata, Ocimum africanum Lour. (O. africanum), Ocimum basilicum L. (O. basilicum), Ocimum gratissimum L. var. macrophyllum Briq. (O. gratissimum) and Coriandrum sativum L. (Co. sativum), while Mentha cordifolia Opiz ex Fresen (M. cordifolia) was observed to be a good source of vitamin C (381.36-547.47 mg). High carotenoids were mostly found in Eryngium foetidum L. (E. foetidum), O. gratissimum, Co. sativum and O. basilicum (75.23-119.96 mg). Interestingly, the location of sample collection seemed to have minimal effect on the nutritional and carotenoid compositions. The results of this study provide reliable information concerning the nutritional and carotenoid contents in plant sources with control of origin, which could be used in the future for food development with specific nutritional requirements.