Fresh mushrooms have very high transpiration rates. At 10 ◦C and 96%RH, the transpiration rate of fresh mushrooms is 0.25 mg of water cm−2 h−1 (Mahajan et al., 2008). Based on this rate, a punnet containing 250 g of mushrooms would produce 14.4 g of water during 5 days of storage. This would require a desiccant to have high moisture holding capacity and the ability to remain in powder form for long periods. None of the desiccants tested were suitable for mushrooms, therefore a combination of two or more desiccants were investigated. The selected desiccants were sorbitol, which showed high moisture holding capacity and bentonite, which stayed in powder form for a long period. The level of mixing was sorbitol at 0.25, 0.50 and 0.75 g g−1 mixed with bentonite at 0.75, 0.5 and 0.25 g g−1, respectively, as shown in Table 1. Fig. 2 shows the moisture uptake by mixed desiccants during storage at 10 ◦C and 96% humidity. Increasing the amount of bentonite in the mixture increased the time required for desiccant to turn into liquid. However, the moisture holding capacity did not change significantly (P < 0.05). The combinations of 0.25 g and 0.5 g of bentonite were not found to be suitable as they turned into liquid within 50 and 74 h of storage, respectively. The best combination was found to be 0.75 g of bentonite and 0.25 g of sorbitol, which remained in the powder form even after 120 h of storage at 10 ◦C. However, this combination absorbed only 0.32 gwater g−1 desiccant, indicating that a third desiccant would be required to increase its moisture holding capacity. Therefore, further experiments were performed by adding CaCl2 in two different proportions (0.1 and 0.2 g g−1 of the mixed desiccant) to the selected mixed desiccant containing bentonite and sorbitol. Fig. 3 shows the moisture uptake by these mixed desiccants during storage at 10 ◦C and 96% humidity. The mixed desiccants with 0.1 g and 0.2 g of CaCl2 stayed in the powder form during 6 days of storage and absorbed 0.5 and 0.9 gwater g−1 desiccant, respectively. Therefore, the combination with bentonite (0.55 g g−1) + sorbitol (0.25 g g−1) + CaCl2
(0.2 g g−1) was selected for further studies.
เห็ดสดมีอัตราการคายน้ำสูงมาก 10 ◦ C และ 96 เปอร์เซ็นต์ และอัตราการคายน้ำของเห็ดสดคือ 0.25 mg ต่อน้ำ cm − 2 H − 1 ( mahajan et al . , 2008 ) ตามอัตรานี้ ตระกร้าเล็กก้นตื้นที่มี 250 กรัมของเห็ดจะผลิต 14.4 กรัมของน้ำในช่วง 5 วัน ของการจัดเก็บ This would require a desiccant to have high moisture holding capacity and the ability to remain in powder form for long periods. None of the desiccants tested were suitable for mushrooms, therefore a combination of two or more desiccants were investigated. The selected desiccants were sorbitol, which showed high moisture holding capacity and bentonite, which stayed in powder form for a long period. The level of mixing was sorbitol at 0.25, 0.50 and 0.75 g g−1 mixed with bentonite at 0.75, 0.5 and 0.25 g g−1, respectively, as shown in Table 1. Fig. 2 shows the moisture uptake by mixed desiccants during storage at 10 ◦C and 96% humidity. Increasing the amount of bentonite in the mixture increased the time required for desiccant to turn into liquid. However, the moisture holding capacity did not change significantly (P < 0.05). The combinations of 0.25 g and 0.5 g of bentonite were not found to be suitable as they turned into liquid within 50 and 74 h of storage, respectively. The best combination was found to be 0.75 g of bentonite and 0.25 g of sorbitol, which remained in the powder form even after 120 h of storage at 10 ◦C. However, this combination absorbed only 0.32 gwater g−1 desiccant, indicating that a third desiccant would be required to increase its moisture holding capacity. Therefore, further experiments were performed by adding CaCl2 in two different proportions (0.1 and 0.2 g g−1 of the mixed desiccant) to the selected mixed desiccant containing bentonite and sorbitol. Fig. 3 shows the moisture uptake by these mixed desiccants during storage at 10 ◦C and 96% humidity. The mixed desiccants with 0.1 g and 0.2 g of CaCl2 stayed in the powder form during 6 days of storage and absorbed 0.5 and 0.9 gwater g−1 desiccant, respectively. Therefore,ผสมกับเบนโทไนต์ ( 0.55 กรัม G − 1 ) ซอร์บิทอล ( 0.25 กรัม G − 1 ) CaCl2
( 0.2 กรัม G − 1 ) ถูกเลือกสำหรับการศึกษา .
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