10 research outputs found
Preparation of Wine from Jackfruit (Artocarpus heterophyllus lam)Juice Using Baker yeast: Effect of Yeast and Initial Sugar Concentrations
The overproduction of jackfruit (Artocarpus heterophyllus Lam) during harvest season and its short
shelf-life have caused serious losses for farmers. Fortunately, high sugar content of the fruit pulp makes the
juice a potential substrate for wine production. This work was purposed to investigate the effect of yeast and
initial sugar concentrations on jackfruit juice wine fermentation. Clarified jackfruit juice of 14 % w/w sugar
concentration was fermented using 0.5 to 2.0 % w/v Baker’s yeast (Saccharomyces cerevisiae) under anaerobic
condition at 30°C for 14 days. Samples were collected daily for ethanol and sugar contents analysis. The profile
of sugar and ethanol concentration as function of fermentation time, showed that higher yeast inoculums rate
and initial sugar concentrations inhibited growth of yeasts. The fermentation of original jackfruit juice of 14 %
w/w sugar concentration using 0.5% w/v yeast for 9 days was the best to produce a good quality wine with
12.13% v/v of ethanol and specific jackfruit aroma
Processing Follows Function: Pushing the Formation of Self-Assembled Monolayers to High-Throughput Compatible Time Scales
Self-assembled monolayers (SAMs) of organic molecules can be used to tune interface energetics and thereby improve charge carrier injection at metal–semiconductor contacts. We investigate the compatibility of SAM formation with high-throughput processing techniques. Therefore, we examine the quality of SAMs, in terms of work function shift and chemical composition as measured with photoelectron and infrared spectroscopy and in dependency on molecular exposure during SAM formation. The functionality of the SAMs is determined by the performance increase of organic field-effect transistors upon SAM treatment of the source/drain contacts. This combined analytical and device-based approach enables us to minimize the necessary formation times via an optimization of the deposition conditions. Our findings demonstrate that SAMs composed of partially fluorinated alkanethiols can be prepared in ambient atmosphere from ethanol solution using immersion times as short as 5 s and still exhibit almost full charge injection functionality if process parameters are chosen carefully. This renders solution-processed SAMs compatible with high-throughput solution-based deposition techniques
Sensor arrays: arrays of micro- and nanoelectrodes
This chapter deals with the principles of functioning and electroanalytical usefulness of arrays of micrometer and nanometer-sized electrodes. We discuss arrays of microelectrodes both individually shaped and interdigitated. In the field of nanostructured electrodes, both nanoelectrode ensembles (random arrays) and ordered arrays are presented. A comparison between the fabrication methods, characteristics as well as advantages and limits of each kind of array are critically evaluated