1.2.1) changes in brightness (Lightness)
.The effect of soaking solution of longan fruit in various affecting the colour changes of covering longan cv. The brightness of the color of the shell (Table 2).On 24 of preservation. Process of sodium metabisulphite bisulphite concentration 10% adjust pH4 with sound intensity level of sodium เมทตา bisulphite concentration 10% adjust. PH4 with citric acid, sodium metabisulphite process bisulphite concentration.PH2% adjust with sound intensity level and process sodium metabisulphite bisulphite concentration 10% adjust pH2 with citric acid anhydrous, can maintain the brightness of the color of the shell was most significantly. The equals 58.53 and 58.67 58.82 58.55 respectively, followed by the processes of citric acid concentration 5% (pH4) and process คอบิก ascorbic acid concentration 1% (pH4). Equals 53.15 53.95 and respectively. The process control was minimal brightness as 52.04
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