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Analysis of some biochemical indicators during the growth and development of 3 sugarcane varieties ROC10, ROC23, ROC26 is one of the methods contributing to the prequalification of sugarcane varieties with good quality. The results showed that the reducing sugar content in the stems of all three sugarcane varieties decreased with age, of which ROC23 and ROC26 were less than that of ROC10. The sucrose content increased gradually, and ROC23, ROC26 had higher sucrose content than ROC10. The starch content in the cane stem decreased gradually with the age of the plant, of which varieties ROC23, ROC26 were less than ROC10. Vitamin C content of ROC23 variety was higher than that of ROC10 variety in the growing period while ROC26 variety at an early stage, vitamin C content was less than that of ROC10 variety but from 9 months old onwards, it was higher than ROC10 variety. The cellulose content of the ROC23 variety was highest, followed by the ROC10, and the lowest was the ROC26 variety. The results of this study are the scientific basis for selecting sugarcane varieties with good quality based on the biochemical changes of the plant during growth and development.

Research to determine the ripening time of the fruit is the scientific basis for better harvesting and preservation. Physiological and biochemical methods were used to analyze the changes of some indicators according to the growth and development of banana fruit grown in Thanh Liet commune, Thanh Tri district, Hanoi from the time of its formation until the fruit ripening. The results showed that the banana reached the maximum size at 16 weeks old, at this time the peel was yellow due to the decrease in chlorophyll and increased carotenoid content. The content of vitamin C and total organic acid content reached their maximum when the fruit at 12 weeks old, then decreased gradually. Starch content increased to 14 weeks old, then decreased. Reduced sugar content increased gradually to 16 weeks old and then decreased. Protein content decreased gradually from fruit formation until fruit ripening, lipid content increased gradually to 15 weeks old, then decreased. Through the research process, we have determined that the physiological ripe time of banana fruit was 16 weeks old, this is the time when the fruit stops growing and accumulates many nutrients.

The banana fruit reached its maximum size in terms of length and diameter at 18 weeks of age. The content of chlorophyll a in banana peel reached the highest value at 14 weeks old, chlorophyll b content reached the highest value at 12 weeks old and decreased rapidly. The content of carotenoid was low from fruit formation and then increased rapidly until the fruit is fully ripening. The vitamin C content and total organic acid content reached a maximum at 16 weeks old and then decreased until the fruit is fully ripened, the reducing sugar content increased continuously and reached a maximum at 18 weeks old and then decreased slightly. The starch content and pectin content reached a maximum when the fruit was 14 weeks old and then gradually decreased. The tannin content decreased from fruit formation until fruit ripening. Through the research process, we found that banana achieves the best quality to harvest when fruits are 18 weeks old. The results of this study provide important data for the harvesting and storage of banana fruit.

Antibiotics are contaminants at low concentrations and found in water with the range of ng/L. Determination of antibiotics at trace concentrations requires modern and high accuracy equipment. Liquid chromatography mass tandem spectrometry (LC-MS/MS) able to determine contaminants at ppt and ppb levels, which is suitable for quantification of the macrolide and tetracycline group in water. The Analytical method using Agilent Triple Quard 6460 LC-MS/MS system with positive ion mode. Agilent XDB C18 column (1.8 µm × 2.1 × 100 mm) and Agilent Eclipse SDB C18 pre-column (2.1 × 5 mm × 1.8 µm) were used. Mobile phase was acetonitrile and HCOOH 0.1%. Samples were cleaned with Oasis PRiME HLB 3cc SPE column (150 mg). The method was evaluated based on specificity, recovery, repeatability and estimation of the uncertainty. The method detection limit (MDL) for the analytes is 0.03 µg/L. Recovery ranges from 85.23 -117.70%; repeatability (RSDr) is between 2.20% and 12.45%.