title: Ascorbic acid enrichment of whole potato tuber by vacuum-impregnation.
abstract: The aim of this study was to evaluate the use of vacuum-impregnation (VI) for enriching the ascorbic acid content of whole potatoes. Whole potatoes were immersed in a 10% ascorbic acid (AA) solution. A vacuum pressure of 70cm Hg was applied for 0-60min, following atmospheric pressure restoration for 3h, while samples remained in the VI solution. AA concentrations of potatoes were measured using HPLC. The effects of cooking and storage time in subsets of the fortified samples were also evaluated. Results indicated that the AA concentration of whole potatoes increased with vacuum time (max 150mg/100g fr. wt.). In addition, a steam-cooking study showed that 100g of the 25min steam-cooked VI potatoes could provide adults with 90-100% of the recommended daily allowance of AA (100mg). The storage study showed that VI whole potatoes had a relatively high AA concentration (50mg/100gfr. wt.), even at 14days of storage at 4°C. This study indicated that VI treatment of whole potatoes was useful for enriching the AA content.
authors.affiliation: Obihiro University of Agriculture and Veterinary Medicine, Obihiro 080-8555, Japan. Electronic address: kazuhiro@obihiro.ac.jp.
authors.forename: K
authors.initials: K
authors.lastname: Hironaka
authors.affiliation: Obihiro University of Agriculture and Veterinary Medicine, Obihiro 080-8555, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Kikuchi
authors.affiliation: Obihiro University of Agriculture and Veterinary Medicine, Obihiro 080-8555, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Koaze
authors.affiliation: Obihiro University of Agriculture and Veterinary Medicine, Obihiro 080-8555, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Sato
authors.affiliation: Obihiro University of Agriculture and Veterinary Medicine, Obihiro 080-8555, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Kojima
authors.affiliation: Obihiro University of Agriculture and Veterinary Medicine, Obihiro 080-8555, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Yamamoto
authors.affiliation: Obihiro University of Agriculture and Veterinary Medicine, Obihiro 080-8555, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Yasuda
authors.affiliation: National Agriculture and Food Research Organization for Hokkaido Region in Japan, Memuro 082-0071, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Mori
authors.affiliation: National Agriculture and Food Research Organization for Hokkaido Region in Japan, Memuro 082-0071, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Tsuda
keywords: Ascorbic acid; Steam-cooking; Storage; Vacuum impregnation; Whole potato