Dose acoustic firmness relate to sensory perception of apple texture?
Johnson D.S. and Dover C.J.
5th International Postharvest Symposium . Volume of Abstract . Verona, Italy 6-11 June 2004, p.118
2004
บทคัดย่อ
Dose acoustic firmness relate to sensory perception of apple texture?
Apple samples covering a wide range in texture were produced by storage in different regimes and by using two varieties (Cox’s Orange Pippin and Gala). Fruit was graded into 3 size bands prior to storage. Acoustic firmness was measuredusing an AFS unit (
AWETA BV) and penetrometer measurements were made using a Lloyd LRX materials testing machine fitted with an 11 nm probe. A trained panel at Leatherhead Food Research Association,
UK, carried out the sensory assessments. Measurements were made on three replicate sets of samples to correspond with three sensory panel sessions. Separate samples were used for penetrometer measurements and sensory tests but acoustic firmness was measured on all samples of fruit. In Cox the penetrometer measurements showed a general decline with increasing fruit size and with increasing store oxygen concentration. A decline in acoustic firmness index with increasing fruit size and oxygen concentration was observed though with an apparent reduced sensitivity compared to the penetrometer measure. The sensory assessment of crispness showed a similar overall trend with oxygen concentration, but without a consistent effect of fruit size. For Gala apples similar trends with storage atmosphere for sensory crispness and penetroneter measurements were observed, though there was a clear trend of declining values with increasing fruit size for the penetrometer which was not evident for sensory crispness. There appeared to be little effect of storage atmosphere or fruit size on acoustic firmness index for this variety. When data for the two varieties was combined, there was a good relationship between penetrometer readings and scores for sensory crispness for values below ~60N, though less good above 60N. The relationship between acoustic firmness and sensory crispness was poor, as was that between acoustic firmness and penetrometer readings particularly between 60-70N.