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Physiological postharvest response of thyme (Thymus vulgaris L.) Herbs.

Bottcher, H., Gunther, I. and Kabelitz, L.

Gartenbauwissenschaft Volume 66, Number 4, 2001. Pages 172-181.

2001

บทคัดย่อ

Physiological postharvest response of thyme (Thymus vulgaris L.).

In 7 trials, T. vulgaris (cv. Deutscher Winter) recorded a respiration rate of 576 plus or minus 126, 1281 plus or minus 338 and 2366 plus or minus 637 W/t at 10, 20 and 30 deg C, respectively. These levels were maintained throughout 80 h postharvest storage, as the values during this period declined only by 60% at 10 deg C, 59% at 20 deg C and 63% at 30 deg C. Respiration and transpiration activities resulted in a fresh weight loss of 1.50% in 24 h (10 deg C). External quality traits required for culinary herb and tea products were best preserved at 10 deg C. Further increase in temperature resulted in a progressive decline in quality. Based on respiration and transpiration, thyme plants stored between 10 and 30 deg C for 80 h showed no marked loss in essential oil and thymol. In another test, a premortal synthesis of essential oils (+20.8%) and thymol (+12.6%) was observed at 10 deg C. The amount of rutoside (3.3, 8.4 and 11.2% at 10, 20 and 30 deg C, respectively) decreased with the rise in storage temperature, compared with samples collected during harvest. Resulting respiration values may be used for the energetic calculation of postharvest treatments (ventilating, cooling and drying, among others).