Sodium alginate edible coating to maintain quality of fresh-cut ?Asterix? potato

The commercialization of fresh-cut potato is limited due to enzymatic browning and loss of firmness. The use of natural agents, like sodium alginate that is derived from brown algae, could be a solution to preserve quality parameters of freshcut products during the storage period. In the present work, the effect of sodium alginate and glycerol on color, firmness, respiratory rate and dry matter content of fresh-cut potato strips were investigated. Edible coatings were applied on Asterix strips (rectangular, 10 x 10 mm cross section) that were dried in paper towel at ambient temperature, vacuum packed in polyethylene bags (-0,98 mbar) and stored at 3?1?C for 12 days. Eleven different treatments were simulated with a Central Composite Rotatable Designs (CCRD), which consisted in concentration of sodium alginate (0.59-3.41% w/w) and glycerol (0.80-2.20 % w/w) as independent variables. Samples were evaluated in the raw strips and after frying. The results showed that the higher concentrations of alginate and glycerol promoted an increase of maximum force (N) of fresh-cut potatoes during the storage. The concentration of sodium alginate did not influence the color and respiratory rate of fresh-cut potatoes. However, the synergistic effect of this edible coating and glycerol at the lowest and highest concentration promoted an increase of respiration of the products after 72 h of storage. Dry matter content was not affected by the concentration of glycerol and sodium alginate studied. SourcesR.D.?. Amaral1, B.C. Benedetti1, M. Pujol?2, I. Achaerandio2, M.L.B. Bachelli11Postharvest Laboratory, School of Agricultural Engineering, University of Campinas, Av. C?ndido Rondon, 501, 13083-875, Campinas, S?o Paulo, Brazil2Departament d?Enginyeria Agroaliment?ria i Biotecnologia. Universitat Polit?cnica de Catalunya, BarcelonaTech, Castelldefels, SpainV Postharvest Unlimited, ISHS International Conference, 10-13 June 2014, Cyprus Picture is by Frutas Logro?o, Key words Poscosecha??????? postcosecha????? postharvest?????? na-oes? ?????????????? ?????????????????????? post-r?colte????? ???? ?? ??????????????????????????????????????? na-oogst???????????? post-raccolta???? Obr?bka po?????? p?s-colheita????? ???????????????????????? hasat sonras????? ??????????????? Ernte???? ????????????????????????? ???? ?????????????????? postcollita?????????? poskliz?ov頠???? ?????? ????????????????? ??????????????? nakon branja???? pozberov頠?????????????????????? obdelovanje zemlje po??????????????? post-colleita????? ??????????????? pascapanen??????????????? ?il?onn postharvest??????? ????????????? p?c ra?as???????????? derliaus apdirbimas polepas tuai??????????? ??????????? post-recoltare???????????? ?????? ?????? ???????????????????????? ?????????????????????? ??????????????????????????? sau thu ho?ch??????????????? ?????????????????????????????? zangemva kwenkathi yokuvuna?????????????????????????????