Gorin N, Rudolphij J W
Z Lebensm Unters Forsch. 1978 Aug 18;167(1):11-5. doi: 10.1007/BF01122879.
Apples harvested in October 1975, from several regions of the Netherlands, were stored in air or under a controlled atmosphere (CA), at 3--4 degrees C in 11 batches. They were analysed for L-malate and sucrose, and their acceptability was assessed by pilot test. The decrease of L-malate during storage (0.1 g in 37.5 days in air and in 75 days under CA) was confirmed. Thus one can predict (at the start of the trial) the L-malate content at a later stage of the storage. It had been proposed previously that 0.39--0.45% of L-malate corresponds to similar proportions of acceptable and unacceptable fruits, as determined by a laboratory panel. This hypothesis was not corroborated by the pilot test. Based on the data of this test, the original criteria were adapted as follows. In most batches, the percentage of unacceptable apples is low (0--15%) as long as the content of L-malate is greater than or equal to 0.55%. If L-malate has already decreased to 0.54--0.50%, then sucrose should be greater than or equal to 2%.
1975年10月从荷兰多个地区收获的苹果，分11批在3至4摄氏度的空气中或可控气氛（CA）下储存。对其进行了L-苹果酸和蔗糖分析，并通过中试评估了它们的可接受性。储存期间L-苹果酸的减少得到了证实（在空气中37.5天减少0.1克，在可控气氛下75天减少0.1克）。因此，可以（在试验开始时）预测储存后期的L-苹果酸含量。此前有人提出，根据实验室小组的测定，0.39%至0.45%的L-苹果酸对应着可接受和不可接受果实的相似比例。该假设未得到中试的证实。根据该试验的数据，对原始标准进行了如下调整。在大多数批次中，只要L-苹果酸含量大于或等于0.55%，不可接受苹果的百分比就很低（0至15%）。如果L-苹果酸已降至0.54%至0.50%，那么蔗糖含量应大于或等于2%。
