Odor is one of the most important characteristics affecting consumer preference for dried shiitake mushrooms [Lentinula edodes (Berk.) Pegler]. In our previous studies, we found that the odor content of commercial dried products was too weak for most
people, and that the odorous compound content could be increased by adding amino acids to sawdust media. Currently, however,
bed-log cultivation is used to produce fruiting bodies for dried products. The purpose of this study was to fi nd a method
to increase the content of odorous compounds in dried products cultivated on bed logs. Pressure injection of amino acids from
the side of the bed log was the most effi cient method, but it had some problems. Hence, a simpler and less troublesome method
was developed, i.e., injecting amino acid solution from small bottles set in deep holes bored in the sides of the bed logs.
In fruiting bodies cultivated on bed logs injected with amino acid solution by the improved method, the mean contents of lentinic
acid, a precursor of the odorous compound lenthionine, approximately doubled compared to that in the untreated logs, although
the infi ltration area of the solution injected by the improved method was smaller than that by the former method. 相似文献
This study on dried shiitake mushroom [Lentinula edodes (Berk.) Pegler] focuses on the behavior of the aromatic lenthionine compound and its precursor, lentinic acid, during the
drying process. Only a small amount of lenthionine was present after the drying process, regardless of the drying temperature
or time; however, the amount increased during the rehydration process using pH 8.0 buffer. The lenthionine content after incubation
in the buffer was correlated with the lentinic acid content in the dried shiitake mushroom. The lentinic acid content increased
signifi cantly during the drying process at 40°C up to 4 h. The results show that the characteristic smell of dried shiitake
mushroom was weak after drying, and that rehydration in a mild alkaline solution was necessary to increase the smell. The
lentinic acid content of dried shiitake could serve as an indicator of the smell produced by rehydration and would be useful
in screening to select odor-rich strains. Moderate heating likely caused the increase in lentinic acid content, which might
be related to a reaction to heat. 相似文献
To investigate the factors governing retention of pesticidal spray solutions on plant surfaces, a new retention model for droplets on solid surfaces has been introduced as where ΔΘ = Θa – Θr. The minimum sliding volumes (MiSV) of surfactant aqueous solutions (2 g litre?-1; surface tensions; 28·5 – 72·5 mN m?-1) on smooth surfaces of paraffin wax and polymer sheets were measured and the validity of the above retention equation was verified on combinations of these solutions and surfaces. A concept of the specific adhesional force (Fa) of a droplet was defined as which was the maximum adhesional force on a unit length of the width of the contact circle of a droplet, and Fa values of the solutions on the surfaces were compared. The predominant factors for droplet retention are discussed on the basis of this model. 相似文献
Mating disruption of the cherry tree borer, Synanthedon hector (Butler), with synthetic sex attractant was conducted for 6 years to test the efficiency of the method to control the borer
population on the slopes in the Cherry Tree Forest of Tama Forest Science Garden, Hachioji, Tokyo. No male adult moth has
been captured in traps baited with the synthetic attractant since the commencement of the control. The incidence of attack
decreased to a low level in the third year and has remained low thereafter, indicating the effectiveness of mating disruption
in controlling the borer population. 相似文献
茶挥发性成分中的萜烯醇类具有生物合成的遗传特性。根据萜烯指数(即:芳樟醇及其氧化物/(芳樟醇及其氧化物十香叶醇)比值,TI〕所作的化学分类表明,云南省茶的 TI 值接近于1.0,而分布于其他产茶省区的茶树 TI 值均低于上述值,并伴随有由西南向东和东南逐渐下降的趋势。由云南引入的日本山茶,具有与云南相近的 TI 值,而日本当地茶树品种的 TI 值与中国浙江相近似,因而推测中国茶树的原产地为云南,然后沿长江和沿海逐渐向东和南方传播。 相似文献
AKD-2023, 3-dodecyl-1,4-dihydro-1,4-dioxo-2-naphthyl acetate (proposed common name acequinocyl) is a novel miticide now under commercial development. It has outstanding miticidal activity against economically important spider mites with the new mode of action of inhibition of mitochondrial electron transfer at complex III. 相似文献