Due to the wide variety of chemical hazards, food may be contaminated in many links such as food production, processing, storage, sale and transportation. Non-targeted analysis is a full-analysis technique that gives comprehensive information about exogenous substances in food simultaneously. This paper mainly introduces the non-targeted screening sample pretreatmentmethodsand the recently reported sample pretreatment materials in food safety analysis, compares the advantages and disadvantages of sample pretreatment methods and materials through a list. The development trend is prospected.

This paper discusses the solidification characteristics of natural water, mineral water and purified water from the two aspects of supercooling degrees and freezing point depression. The conclusions are verified by experiments. It is clarified that colligative properties of dilute solutions and the destruction of the hydrogen bonds between water molecules due to hydration of ions (ion-dipole interactions) are the main reasons for changes of freezing points and supercooling degree of drinking water. This paper aims to provide a theoretical reference for the storage of drinking water at low temperatures, and help people correctly understand the solidification properties of water from multiple perspectives and promote their scientific cognition.

Integrating value shaping, knowledge imparting and ability training into education is the fundamental task of curriculum ideological and political education, and is also an inevitable requirement for moral education. In this article, we mainly expound how to innovatively carry out the ideological and political teaching of organic synthesis course from the three-dimensional perspective of “objective-method-evaluation”. We start with the design of the overall course objectives, and construct a target system where the organic synthesis knowledge is corresponded to the civic elements. Additionally, we aim to achieve the organic unity of value guidance, knowledge imparting and ability training innovatively in combination of discussion, inquiry, and practice. Finally, the achievement degree analysis on course objectives is conducted to evaluate the effect of ideological and political education on organic synthesis course.

In China, the correct pronunciation of organic compounds in Chinese is an important basis for education, academic exchange and development of organic chemistry. However, many pictophonetic characters are contained in the Chinese names of organic compounds. Some characters are easy to be misread because they have different tone or pronunciation with their phonetic component. This article summarizes the Chinese professional terminologies for common organic compounds, and annotates them one by one according to Xinhua Dictionary, Chinese Word Dictionary (Cihai) and other reference books. This article can be used as an important reference for chemical workers and beginners.

Ionic liquids are highly promising novel electrolytes with unique physicochemical properties. How to improve the efficiency and interests of students in learning ionic liquid electrolytes, especially abstract concepts and knowledge, is a topic of current chemical education. In this paper, a teaching scheme based on multi-angle analysis of problems and guiding students’ associative learning is proposed, using the analysis of the guanidinium cation in guanidinium-based ionic liquids as well as its precursor-guanidine as an example, aiming to diversify teaching methods for ionic liquids and simultaneously simplify the teaching content so as to stimulate students’ interests in learning.

This paper establishes a new teaching mode of the curriculum of “Computational Chemistry and Application” which is suitable for cultivating innovative and high-quality talents under the construction of new engineering discipline. The new teaching mode is based on the core concept of “student-centered, teacher-led; theory as the basis, practice as the main line; education as the goal, ability as the target”. An optimized curriculum teaching system and a scientific and effective assessment method are established. Through the new teaching organization mode that integrates theory and practice, foundation and frontier, learning and research, the students’ research ability and innovative ability can be comprehensively improved. The designed new teaching mode integrates and crosses computer science, chemistry, engineering and other disciplines, highlight the characteristics of new engineering. The innovative and high-quality talents training system has been established to meet the needs of new engineering construction. The curriculum reform and construction have achieved remarkable success.

Under the perspective of carbon neutrality, the teaching content and training concept of courses offered for students majoring in polymer materials and engineering should be adjusted according to the demand for new talents in the national green and sustainable development strategy. Combined with the characteristics and development direction of polymer materials and engineering specialty, on the basis of strengthening basic theories and knowledge, a series of reforms and explorations have been carried out in various aspects of the courses, such as teaching contents, teaching methods and associated ideological and political education. The curriculum reform will mainly focus on cultivating the students with carbon neutrality concept, innovation consciousness and practical ability, which can improve the quality of talent cultivation in this specialty, and meet the national demand for relevant talents under the carbon neutrality goals.

In order to introduce the Claisen condensation reaction of mixed ester to undergraduate experimental class, a comprehensive chemistry experiment about the preparation of indan-1,3-diones was designed and applied in practice. Using diethyl phthalate and ethyl acetate as starting materials under the catalysis of sodium ethoxide, indan-1,3-diones was successfully synthesized through a three-steps procedure including Claisen condensation, ester hydrolysis, and decarboxylation reaction. The product was characterized through melting point measurement and spectroscopic study including IR, ¹H NMR and ¹³C NMR. The experiment process involves a series of basic operation procedures containing heating reflux, distillation, recrystallization, vacuum filtration, temperature control, and constant pressure drop. In this experiment, comprehensive experimental techniques concerning organic synthesis, product separation and structure characterization are utilized, which is beneficial to improve undergraduates’ multi-step synthesis ability and spectrum analysis ability.

Polymer chemistry experiment course is a compulsory course for students major in polymer materials and engineering, and plays pivotal role in cultivating the practical and innovative capability of students. The implementation of “student-centered” conception during the teaching of polymer chemistry experiment helps to trigger the enthusiasm of students and strengthen the theoretical knowledge of polymer chemistry, thus greatly enhancing their ability to address complicated engineering issues of polymer science. The teaching reform of polymer chemistry experiment course is primarily focused on the optimization of experimental items and contents and the introduction of advanced teaching methods, thereby comprehensively enhancing the capability of students. Accordingly, a new set of evaluation contents and standards for polymer chemistry experiment is thus established, which emphasizes more for the experimental process. The teaching reform is significant for cultivating high qualified students to meet the requirement of society.

The comprehensive experiment of one-pot total synthesis of Evodiamine from readily available substrates is designed based on the theoretical knowledge of total synthesis of natural products. The experiment includes four parts: Background literature investigation and analysis, one-pot total synthesis of Evodiamine, structural characterization and mechanism study. Students’ comprehensive quality in literature retrieval, experiment operation, and spectra analysis will be trained in this experiment. Moreover, this experiment can significantly improve the students’ understanding of organic synthesis and mechanism study, and further improve their cognition about the logic of scientific research. This experiment will lay a foundation for students to engage in relevant scientific research or practical work in the future.

From the perspective of green chemistry, we explore the use of a non-toxic organic “n-octadecanol/lauric acid” eutectic system with low melting point near room temperature to improve the experiment of “binary phase diagram construction of simple eutectic system”. By measuring a series of cooling curves of the binary system with various compositions, the phase change temperatures were obtained to plot the liquidus line in the phase diagram. Furthermore, those phase change temperatures were verified by means of differential scanning calorimetry, indicating the above two methods are in good agreement with each other and the feasibility of the proposed binary organic eutectic system. In addition, due to its considerable latent heat of the phase change of higher aliphatic alcohol/acid system, the binary system shows great promise as room-temperature phase change energy storage material. Thus, the proposed experiment based on the organic eutectic system, while making green chemical improvement to the experiment, can also help students understand the prospect technology of phase change material and the latent heat thermal energy storage.

The importance and teaching status quo of chemistry teaching theory experiment, as well as the advantages and functions of self-made micro video in teaching are reported. Based on the learning pyramid theory and cooperative learning theory, this paper expounds the process of integrating self-made micro video into chemistry teaching theory experiment teaching and analyzes the actual teaching situation. Focusing on exploring the teaching expansionary effects of self-made micro-video on chemistry teaching theory experiment in colleges and universities, experimental teaching is carried out by training students to make self-made micro videos, and thus information technology is integrated with experimental teaching, which cultivate pre-service teachers’ experimental skills, teaching practice ability and information technology application ability.

The teaching content of colloid is analyzed, and the teaching design is carried out according to the characteristics of knowledge and students’ learning situation. The teaching is guided by experimental inquiry, and the focus is on cultivating students’ ability of macro and micro discrimination and model cognition. Knowledge transfer is carried out through the constructed model, and the problems in life and pharmaceutical production are explained.

In the field of forensic science, the visually rapid and accurate inspection of explosive residues at the scene of explosion cases can point out the direction for the investigation of cases and make rapid judgments on the nature of cases. In this paper, six kinds of sensitive units are used to construct the chemical sensor array. Digital cameras are used to take pictures of the chemical sensor array to collect images. Adobe Photoshop 2022 is used to process the images to obtain RGB data. Combined with principal component analysis, cluster analysis and linear discriminant analysis, the types of explosive residues are judged, with an accuracy of 100%. The theory and application of visual inspection based on chemical sensor array are integrated into the experimental teaching of forensic chemistry, which can expand students’ scientific research perspective and train their experimental operation ability.

A comprehensive chemistry experiment on the preparation and application of mineral-based environmental remediation materials was designed based on the chemistry experiment platform to promote the ‘combination of research and learning’ and enhance students’ practical operation ability. Here, the experiment comprises the preparation and characterization of modified zeolite materials and the exploration of their applications. Our teachers’ scientific research achievements are the motivation behind this experiment, which has been probed in the comprehensive experimental course of environmental chemistry in our school.This experiment helps students in mastering important skills such as literature research, material preparation and characterization, performance analysis, data processing, etc. Moreover, this inspires the students to exercise their ability to design new comprehensive experiments and stimulate their interest in exploring new frontiers of environmental remediation materials.

Based on MOE software, the virtual screening experiment of inhibitors derived from active substances of Zanthoxylum bungeanum against FtsZ of drug-resistant Staphylococcus aureus was designed as a teaching case in undergraduate comprehensive experimental course in food science major. Molecular docking simulation method was adopted to conduct the virtual screening of targeted inhibitors. Through the establishment of ligands molecule database, receptor preparation, docking parameter setting, evaluation of docking screening results and verification of antibacterial activity, students can comprehensively grasp the virtual screening of active molecules based on molecular docking and verification of inhibitors’ antibacterial activity in vitro, reduce the difficulty for students to understand the molecular antibacterial mechanism, broaden their understanding of new means of interdisciplinary cross research, and enhance students’ innovation practice ability.

A systematic engineering analysis was carried out on the technical indicators of hydrogen storage cylinders in the key special project of “Renewable Energy and Hydrogen Energy Technology”. According to the working conditions of the real gas, a variety of state equations are used for mass balance calculation, and different calculation methods and applicable conditions are carried out. After detailed analysis, the calculation results are summarized and discussed, and the formula selection for the real hydrogen under the condition of high-pressure continuous gradient is proposed, which can be used as the new material for the project-based learning course design under the big ideas concept of the actual gas mass calculation.

From 1828 to 1931, after a hundred years of exploration by chemists, the modern concept of ruthenium was gradually formed. It can be divided into three stages: the separation of impure ruthenium elements from ruthenium-platinum ore residue, the successful preparation of ruthenium elements and the discovery of ruthenium isotopes. In the process of the formation and development of the concept of ruthenium, creative and intuitive thinking played an important role, as well as the rigorous and realistic scientific attitude and the scientific spirit of critical and questioning.