Teores de minerais em polpas e cascas de frutos de cultivares de bananeira

Abstract

Resumo -O objetivo deste trabalho foi determinar a percentagem de matéria seca, o teor de minerais e a capacidade de fornecimento de minerais, com base na ingestão dietética de referência na polpa e na casca de frutos verdes e maduros de 15 cultivares de bananeira. Utilizaram-se quatro cachos por cultivar e seis frutos por unidade amostral. Foram coletadas amostras frescas da polpa e da casca, para digestões sulfúricas (0,2 g) e nitroperclóricas (0,5 g). Foram determinados: no extrato sulfúrico, o N total pelo método Kjeldahl; e, no extrato nitroperclórico, P, K, Ca, Mg, Cu, Mn, Fe, Zn e Se. O P foi determinado por colorimetria, e os demais nutrientes, por espectrofotometria de absorção atômica. O teor de minerais na polpa e na casca foi expresso com base na média dos dois estádios. Há diferenças entre cultivares de bananeira quanto à concentração de macro e micronutrientes na polpa e na casca, mas não entre frutos verdes e maduros. A cultivar Terrinha apresentou a maior percentagem de matéria seca na polpa, e as cultivares Marmelo e Maçã, na casca. Para N, P, Fe, Zn e Cu, a casca apresentou duas vezes o teor da polpa. O teor de K e Mn na casca foi de aproximadamente quatro vezes o da polpa. A polpa da cultivar Caipira (AAA) e a casca das cultivares Prata e Pacovan (AAB) apresentam os maiores teores de minerais.Termos para indexação: Musa, composição mineral, composição nutricional, ingestão dietética de referência. Mineral content in the pulp and peel of banana cultivarsAbstract -The objective of this work was to determine the dry matter percentage, the mineral content, and the ability to supply minerals, based on dietary reference intake in the pulp and peel of unripe and ripe fruits of 15 banana cultivars. Four bunches were used per cultivar, and six fruits per sample unit. Fresh pulp and peel samples were collected for sulfuric (0.2 g) and nitric perchloric (0.5 g) digestions. The following were determined: in the sulfuric extract, total N by the Kjeldahl method; and, in the nitro perchloric extract, P, K, Ca, Mg, Cu, Mn, Fe, Zn, and Se. P was determined by colorimetry, and the other nutrients by atomic absorption spectrophotometry. The mineral content in the pulp and peel was expressed based on the average of the two stages. There are differences between banana cultivars regarding the concentration of macro-and micronutrients in the pulp and peel, but not between unripe and ripe fruits. The Terrinha cultivar showed the highest percentage of dry matter in the pulp, and the Marmelo and Maçã cultivars in the peel. For N, P, Fe, Zn, and Cu, the peel showed twice the content of the pulp. The content of K and Mn in the peel was approximately four times that of the pulp. The pulp of the Caipira (AAA) cultivar, and the peel of the Prata and Pacovan (AAB) cultivars show the highest mineral contents.

Chilling Prevention on Banana ‘Nanica’ in the Field with Bagging

“…There were no problems in the handling of fruits bagged with BTP+KP in the post-harvest, which could indicate a greater possibility of physical damage due to the lower peel thickness. Aquino et al (2014) found mean DMpeel value of 10.25% for subgroup AAA cultivar, similar to that found in this study.…”

Characterization of chemical and mineral composition of marolo (Annona crassiflora Mart) during physiological development

“…Potassium (Figure 2e) obtained an increment on it content within the development of fruit, reaching 0.68% at 145th development day. Gondim et al (2005) and Aquino et al (2014), observed higher values than those found in this research when they studied the proximate composition and minerals on fruits peels. Kinupp & Barros (2008) found similar values and lower than those found on this experiment, studying the protein and mineral contents of several native species.…”

Influence of bunch bagging on the development of banana Prata (AAB) and prevention of chilling injury in the field

“…For K and Fe, there was a significant interaction between year of bunch formation and the bagging material. Aquino et al (2014) found higher levels of N, P, Ca, Mg, Cu, Mn, Fe, and Zn in the peel of 'Prata' fruits, compared to those obtained in this study. In the pulp, N, P, K, Ca, Mg, Fe, Mn and Zn contents were higher and Cu contents were close to this study.…”