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- W2019905784 abstract "Abstract The alterations of acids in birch sap (Betula pendula Roth. and B. pubescens Ehrh.) used for birch syrup production in Finland were observed in the flow seasons of 1983 and 1984. The pH of the sap decreased from over 7·5 to 5·5 during the spring. Malic acid increased from 100 to 600 mg litre−1 and dropped quickly after bud opening. The level of phosphoric acid was about one-tenth that of malic acid and showed an analogous trend. The concentration of succinic acid increased progressively from about 10 to 300 mg litre−1 and that of citric acid from 5 to 20 mg litre−1. No differences were observed between the acid contents of the two species. The sugar-acid ratio decreased rapidly during the first flow week and remained nearly constant (between 10 and 25) during the main flow period." @default.
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- W2019905784 date "1987-01-01" @default.
- W2019905784 modified "2023-09-26" @default.
- W2019905784 title "Seasonal variations of the acids in birch sap" @default.
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- W2019905784 doi "https://doi.org/10.1016/0308-8146(87)90015-x" @default.
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